JP2006262018A - Pon transmitter, its connection switching method and its connection switching program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PON transmitter which reduces the frequency of limiting a usable band in PON transmission communication and optimizes the accommodation of an ONT single body device, and the connection switching method and connection switching program of the PON transmitter. <P>SOLUTION: On the basis of respective communication conditions (traffic information) monitored in a statistic information gathering part 17, in order to optimize the connection of the respective ONT single body devices 27, the optimum connection relation of the optical connection route of an optical switching part 23 between a first stage optical coupler 21 and a plurality of second stage optical couplers 25 is analyzed in an analysis part 29, and the switching of the light connection route of the light switching part 23 is controlled on the basis of the analyzed result in a control part 31. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a PON transmission apparatus that transmits and receives optical signal information, and more particularly to a PON transmission apparatus and a PON transmission apparatus that switch connections between first and second stage optical couplers according to communication conditions and at appropriate timing. The present invention relates to a connection switching method and a connection switching program for a PON transmission apparatus.

In recent years, PDS (Passive
A PON transmission apparatus that constitutes an optical subscriber access network economically using the Double Star technology is generally spreading.

The PON transmission apparatus includes an STM-PON (Synchronous Transfer Mode Passive Optical Network) transmission apparatus that handles synchronous transfer mode (STM) information, and an ATM-PON (Asynchronous) that handles asynchronous transfer mode (ATM) information.
There are two types of transmission devices: Transfer Mode Passive Optical Network).

  In general, as shown in FIG. 11, the PON transmission apparatus includes a PON aggregation device Pd connected to a plurality of upper lines 13 such as an optical network, and CH units as individual optical communication units in the PON aggregation device Pd. A plurality of first stage optical couplers 21 are connected to the first stage optical couplers 21 via the optical transmission line, and a plurality of second stage optical couplers 25 are connected to the first stage optical couplers 21 via the optical transmission line. The two-stage optical coupler 25 is connected and accommodated with a plurality of ONT unit devices 27 as termination devices via an optical transmission line.

  A plurality of CH units 15 of the PON aggregation device Pd are connected to a plurality of ONTs via a plurality of devices (for example, a single ONT device) (not shown) on the line 13 side, and a first-stage optical coupler 21 and a second-stage optical coupler 25, respectively. A function for allowing PON communication such as ATM information to be performed with the single device 27 is provided.

  On the other hand, in another conventional technology corresponding to the PON transmission apparatus, first, a plurality of ports of the center apparatus and a plurality of ports of the first-stage optical branching element are connected, and an optical switch is used. A method of selecting both connections is known (for example, see Patent Document 1). Secondly, it is known that optical communication is performed by specifying a counter partner from a physical one-to-n connection using a reflected wave of an optical signal (see, for example, Patent Document 2).

JP-A-8-242207 Japanese Patent Laid-Open No. 10-41897

  However, in the PON transmission apparatus shown in FIG. 11, since the line bandwidth is distributed by the number of accommodated lines, each ONT single device 27 has a fixed minimum guaranteed bandwidth, but each CH unit 15 accommodates it. When communication is performed with respect to a plurality of ONT single devices 27 in the same time zone, there is a problem that the optical communication in one ONT single device 27 is limited to the minimum guaranteed bandwidth. In addition, since installation and expansion of the ONT single device 27 to the CH unit 15 are performed randomly regardless of performance (bandwidth allocation), many of the user's ONT single devices 27 accommodated in the same CH unit 15 have the same time. When optical communication is performed all at once in a band, there is a problem that performance (dynamic band allocation) per user is lowered. In addition, when switching the accommodation of the ONT single unit 27 to another CH unit 15, the optimum switching destination cannot be easily specified, and it must be performed manually including re-establishment of PON communication. Has a problem that it cannot be easily implemented.

  On the other hand, the present inventors effectively avoid a decrease in performance (dynamic bandwidth allocation) due to a concentrated increase in communication on one optical transmission path, and maintain a way to maintain efficient communication at all times. As a result of intensive studies, the amount of communication on each optical transmission line was analyzed, and a technical idea of dynamically switching and dispersing the optical connection paths after branching was created.

  In Patent Literature 1, two ports of a center device and an optical coupler having a 2 × n configuration are connected, and an input to the optical coupler is selected by an optical switch having a 1 × 2 configuration. Patent Document 2 describes that the second optical transmission / reception apparatus receives a part of the branched optical signal and reflects the other branched optical signal to include the modulated light. There is a description that the communication capacity can be flexibly dealt with by returning to the apparatus.

  However, even if the techniques of both Patent Documents 1 and 2 are combined, the communication amount of each optical transmission path created by the present inventors is analyzed, and the optical path after branching is dynamically switched and distributed dynamically. It was difficult to create a technical idea.

  The present invention solves the above-described problems of the prior art, reduces the frequency of limiting the usable bandwidth in PON transmission communication that occurs due to communication concentration, and accommodates termination devices even when adding termination devices. It is an object of the present invention to provide a PON transmission apparatus, a PON transmission apparatus connection switching method, and a PON transmission apparatus connection switching program that can easily optimize the transmission.

  To achieve the above object, according to the present invention, a plurality of optical communication units, a transmission system composed of a plurality of branch paths branched from the optical communication unit, and a plurality of ONTs individually equipped in the plurality of transmission systems. A PON transmission apparatus configured to perform PON communication between the ONT single unit and the optical communication unit via the branch path; and each of the optical communication units and an ONT single unit corresponding thereto Monitoring means for constantly monitoring the traffic information between the optical communication units, switching on and connecting the ONT single unit of the other optical communication unit that operates based on the traffic information and has less traffic beyond the connection of each optical communication unit, According to the present invention, an optimum line connection can be set (claim 1).

  As a result, the traffic information of each ONT single device is always monitored, and the ONT single device of another optical communication unit with less traffic exceeding the connection of each optical communication unit is switched and connected to set the optimum line connection. The term “beyond connection” naturally includes the connection of the ONT single device to the communication unit in the case of directing the switching connection to the adjacent optical communication unit, but other than leaving across the adjacent optical communication unit. It is possible to direct the switching connection to the optical communication unit.

  In the present invention, a plurality of optical communication units for performing communication with a network, a plurality of optical couplers for branching an optical signal from the optical communication unit, and the individual optical couplers via an optical transmission line And a plurality of terminators for transmitting optical signals to the optical coupler, and the plurality of optical couplers for switching the connection of the terminators. And an optical switching unit that can arbitrarily switch an optical connection path (line) between the plurality of termination devices, provided with a monitoring unit that monitors a communication status of each termination device, and a monitoring result of each communication status Based on the analysis result of the connection analysis means, the connection analysis means for analyzing the optimum connection relation of the optical connection path (line) of the optical switching means to optimize the connection of the termination device based on Characterized by comprising control means for controlling the switching of the optical connection path of the light switching means (claim 2).

  Accordingly, the communication status of each of the termination devices monitored by the monitoring unit is analyzed by a connection analysis unit, and the optical connection path of the optical switching unit is switched based on the analysis result by the control unit, Optimize connection. In the case of performing the optimization, there is one aspect in which the optimization is performed by appropriately distributing the connection relation in order to reduce the excessive concentration of the traffic from the state of each traffic based on the analysis result.

  In the present invention, a plurality of optical communication units for communicating with a network, and a plurality of first-stage optical devices that are provided corresponding to the optical communication units and branch optical signals from the optical communication units. PON transmission communication with each optical communication unit via an optical transmission path, comprising a coupler and a plurality of second stage optical couplers for branching optical signals branched by the first stage optical couplers In a PON transmission device including a plurality of termination devices that perform the optical connection path (line) between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers in order to switch the connection of the termination devices An optical switching means that can arbitrarily switch the communication status, and a monitoring means that monitors the communication status of each termination device, and the optical switching to optimize the connection of the termination device based on the monitoring result of each communication status Said optical connection path (line) of means A connection analysis unit for analyzing the optimal connection relationship of the first and second control units, and a control unit for controlling switching of the optical connection path of the optical switching unit based on an analysis result of the connection analysis unit. Item 3).

  Accordingly, the connection analysis unit analyzes the communication status of each termination device monitored by the monitoring unit, and the control unit switches the optical connection path of the optical switching unit based on the analysis result. The optical connection path between the first-stage optical coupler and the plurality of second-stage optical couplers is dynamically switched to optimize the connection of the terminal devices.

  In the present invention, the optical transmission path includes an arbitrary number of optical couplers. As a result, it is possible to optimize the connection relation of a larger number of the termination devices via more stages of optical couplers.

  In the present invention, the monitoring means is provided on the upper side or the lower side of the optical communication for each of the optical communication units (Claim 5).

  In the present invention, the monitoring means is provided between the optical switching means and the plurality of second-stage optical couplers (Claim 6).

  Further, the present invention is characterized in that the monitoring means comprises a statistical information collection unit that collects each traffic information that is statistical information of each communication (claim 7). Handling traffic information increases the reliability of the analysis result of the connection analysis means.

  Further, in the present invention, the connection analyzing unit is configured to optimize the connection of the optical connection path of the optical switching unit so as to optimize the connection of the termination device based on the traffic information collected by the monitoring unit. It comprises an analysis part for analyzing the relationship (claim 8).

  Further, in the present invention, the connection analysis unit holds the analysis result, and when the connection switching of the optical connection path of the optical switching unit is required, the analysis result is displayed when the traffic of the connection is low. It transmits to a control means (Claim 9). In this case, since the optical connection path of the optical switching unit is switched at a timing when the traffic is low, communication abnormality and communication confusion can be avoided.

  In the present invention, an optical connection path (line) between both of the plurality of second-stage optical couplers may be arbitrarily provided between some of the optical couplers and some of the termination devices. The optical switching means is capable of switching between the optical connection paths based on the control of the control means (claim 10). In this case, switching of more optical connection paths of the termination devices can be managed more precisely.

  In the present invention, when the connection relation of the optical switching means is appropriately switched, the control means establishes PON communication with the new connection relation (claim 11).

  In the present invention, a plurality of first-stage optical couplers for branching a plurality of optical signals from a plurality of optical communication units for performing communication with a network, and a plurality of termination devices are connected to switch the connection of the termination devices. A connection switching method for a PON transmission apparatus that arbitrarily switches an optical connection path between a plurality of second-stage optical couplers to be accommodated, the monitoring step for monitoring the communication status of each terminal device, A connection analysis step of analyzing an optimal connection relationship of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on a monitoring result; and And a connection switching step of switching a connection relationship of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers.

  Thereby, in the connection analysis step, the communication status of each terminal device monitored in the monitoring step is analyzed, and in the connection switching step, the plurality of first-stage optical couplers and the plurality of first optical couplers are analyzed based on the analysis result. The optical connection path between the two-stage optical couplers is switched to an optimum connection relationship, and the optical connection paths between the first-stage optical couplers and the plurality of second-stage optical couplers are dynamically switched. Optimize the connection of each terminal device.

  In the present invention, the monitoring step includes a traffic information collecting step of collecting each traffic information that is statistical information of each communication (claim 13). Handling traffic information increases the reliability of the analysis result of the connection analysis means.

  In the present invention, the connection analysis step includes a storage step for storing the analysis result, and if the optical connection path needs to be switched, the connection switching step is performed when traffic of the connection is low. (Claim 14). Also in this case, since the optical connection path of the optical switching means is switched at a timing when the traffic of the terminal device to be switched is low, communication abnormality and communication confusion can be avoided.

  According to the present invention, a second optical switching path for switching an optical connection path between a part of the plurality of second-stage optical couplers and a part of the termination devices based on the analysis result is provided. A connection switching step is included (claim 15). Also in this case, the switching of the optical connection paths of more terminal devices can be managed more and more precisely.

  In the present invention, when the optical connection path is switched in at least one of the connection switching step and the second connection switching step, a PON communication establishment step of establishing PON communication with the new connection relationship. (Claim 16).

  In the present invention, a plurality of first-stage optical couplers for branching a plurality of optical signals from a plurality of optical communication units for communicating with a network, and a plurality of second-stage optical units accommodating a plurality of termination devices A connection switching program for a PON transmission apparatus that arbitrarily switches an optical connection path with a coupler, the step of monitoring the communication status of each of the terminal devices, and the plurality of second based on the monitoring result of each of the communication statuses Analyzing an optimal connection relationship of the optical connection path between the first-stage optical coupler and the plurality of second-stage optical couplers, and based on the analysis result, the plurality of first-stage optical couplers and the plurality of the plurality of second-stage optical couplers The step of switching the connection relationship of the optical connection path with the second-stage optical coupler is executed by the CPU (Claim 17).

  Thereby, the communication status of each of the terminal devices is monitored in one step, and in the next step, the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on the monitoring result of each communication status. The optical connection path between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers is analyzed based on the analysis result in the next step The path is switched to an optimal connection relationship, and the optical connection path between each of the first-stage optical couplers and the plurality of second-stage optical couplers is dynamically switched to optimize the connection of the termination devices. .

  In the present invention, when monitoring each communication status, the CPU is caused to execute a step of collecting each traffic information as statistical information of each communication (claim 18).

  In the present invention, the step of storing the analysis result in the analysis, the step of determining when the connection of the optical signal is necessary, the step of determining when the traffic of the connection is low, and the step of determining when the traffic is low In this case, the CPU is caused to execute the step of recognizing the analysis result (claim 19).

  Thus, when the analysis result is stored in one step and the connection switching of the optical signal is necessary, it is determined in the next step when the traffic of the connection is low and when the traffic is low. The analysis result is recognized in the next step.

  In the present invention, the step of switching optical connection paths between some of the plurality of second-stage optical couplers and some of the termination devices based on the analysis result, This is executed by a CPU (claim 20). Also in this case, the switching of the optical connection paths of more terminal devices can be managed more and more precisely.

  In the present invention, when the connection relation is appropriately switched, the CPU is caused to execute a step of establishing PON communication with the new connection relation. The terminal device can be easily installed or added without detailed knowledge. Also in this case, the switching of the optical connection paths of more terminal devices can be managed more and more precisely.

  In the present invention, the PON communication status (traffic) is monitored and analyzed, and a plurality of ONT single devices are dynamically switched to an optimal accommodation state, so that the bandwidth that can be used for PON transmission communication is limited in each ONT single device. The frequency of performing can be reduced. Since the accommodation of each ONT single device can be changed dynamically, the ONT single device can be installed or added without considering the degradation of performance (dynamic bandwidth allocation) and further regardless of the wiring connection status. In this case, it is possible to easily realize optimization of the accommodation state of each ONT single device. In addition, since traffic information per unit time is constantly monitored and accumulated, the network administrator can grasp the performance status of each accommodated line and easily consider whether or not to add a network in a short time. It becomes possible.

  According to the present invention, the PON generated with concentration of communication by dynamically switching the accommodation connection of the termination device (ONT single device) accommodated in the optical communication unit to the optimum accommodation state according to the communication situation. The frequency of limiting the usable bandwidth in transmission communication can be reduced, which makes it easy to optimize termination device accommodation even when adding termination devices and switch accommodation connections. Thereafter, PON communication can be re-established without burden on the user.

  Hereinafter, the PON transmission apparatus according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing the configuration of the PON transmission apparatus according to the first embodiment.

  In FIG. 1, a PON transmission apparatus Ps1 is provided with a monitoring means (hereinafter referred to as a statistical information collection unit) 17 on a plurality of upper lines 13 such as an optical network, and is connected to an optical input / output port on the lower side of the statistical information collection unit 17. On the other hand, a PON communication unit 19 having a plurality of optical communication units (hereinafter referred to as “CH units”) 15 a, 15 b, 15 c, and 15 d individually connected to the port is provided, and each CH in the PON communication unit 19 is provided. A plurality of optical couplers 21 are provided for the units 15a through optical transmission paths. The PON transmission device Ps1 further includes an optical switching means (hereinafter referred to as an “optical switching unit”) 23 via an optical transmission path for each optical coupler 21, and each optical input on the lower side of the optical switching unit 23. Among the output ports, a predetermined optical input / output port is provided with a plurality of termination devices (hereinafter referred to as “ONT single device”) 27 via an optical transmission line. Here, an arbitrary number of optical couplers may be interposed in the optical transmission path 22 between the optical coupler 21 and the ONT single device 27.

  A connection analysis unit (hereinafter referred to as “analysis unit”) 29 is connected to the data signal output port of the statistical information (monitoring result) of the statistical information collection unit (monitoring unit) 17, and the PON communication unit 19 includes control means (hereinafter referred to as “control unit”) 31 that inputs electrical signal data of the analysis result of the analysis unit 29 and switches connection of an output destination with respect to the input of the optical signal in the optical switching unit 23. It has been.

  In the case of this example, as shown in FIG. 1, an optical coupler 21 is provided for each of the four CH units 15a to 15d. Each optical coupler 21 has a configuration that splits an optical signal into eight branches. Therefore, a total of eight ONT unit devices 27 can be accommodated in each CH unit 15a and the like. However, when an arbitrary number of optical couplers are interposed in the optical transmission line 22, the number of ONT unit devices 27 can be further increased.

  Each CH unit 15a or the like causes bidirectional optical communication between an external termination device (for example, an ONT single device) via the upper line 13 and the ONT single device 27 shown in FIG. Each of the CH units 15a, for example, terminates the optical line and terminates the optical (electrical) of the optical interface that performs optical-electrical conversion, and terminates the electricity (TC) of the line side interface, and controls transmission of ATM cell packets and management of communication information. The TC layer termination unit to be implemented, the ATM cell-Ether packet conversion, and the ATM-Ether conversion unit that performs the data link layer (AMC) operation of the Ether side interface, and the Ether that terminates the physical layer of the Ether side interface -It has a configuration including a PHY conversion unit.

  The statistical information collection unit (monitoring means) 17 is provided between an external termination device (for example, an ONT single device) on each upper line 13 side via each CH unit 15a and the like and each ONT single device 27 shown in FIG. In the communication, each traffic information per unit time for each ONT single unit 27 is collected, and data of the collection result (monitoring result) is output to the analysis unit 29. The unit time for collecting traffic information may be set arbitrarily.

  The optical switching unit 23 includes upper optical input / output ports (see FIG. 4) 33 that communicate with the optical couplers 21 and lower optical input / output ports (see FIG. 4) 35 that communicate with the individual ONT devices 27. A configuration as an optical switch that dynamically switches an optical connection path (line) between the two in accordance with a control signal from the control unit 31 is provided. As the optical switch, an electronic optical switch, an all-optical optical switch, an n × n optical matrix switch, or the like can be used, but any optical switch that switches an optical connection path (line) is used regardless of this. It's okay.

  The ONT (Optical Network Terminal) single device 27 is a media converter having a configuration corresponding to PON communication, for example, with a computer or the like.

  On the other hand, the analysis unit 29 firstly captures each traffic information per unit time collected by the statistical information collection unit (monitoring means) 17 and analyzes the communication status of each ONT single unit 27 for 24 hours, The analysis result is held in a memory (not shown) or the like. Second, a time zone (timing) in which traffic is low or zero is detected from the analysis result of the communication status of each ONT unit 27 for 24 hours, and the analysis result data is transmitted to the control unit 31 at that timing. To do.

  The control unit 31 includes, for example, a CPU, and firstly controls each of the CH units 15a to 15d of the PON communication unit 19 to realize communication with a plurality of ONT unit devices 27 accommodated in each CH unit 15a and the like. , Manage the necessary information. Second, when the analysis result data transmitted from the analysis unit 29 at the above timing is taken in, the connection switching control signal is sent to the optical switching unit 23 in order to optimize the optical connection path (line) of the optical switching unit 23. Is output. When the control unit 31 optimizes the optical connection path of the optical switching unit 23, specifically, the optical input / output port 33 and the optical input / output port of the optical switching unit 23 are reduced in order to reduce excessive concentration of traffic on one communication path. A control signal for appropriately distributing and controlling the connection relationship of the ports 35 is generated and output to the optical switching unit 23. As a result, the control unit 31 specifies the optimal combination of the accommodation states of each ONT single device 27 and sets the optical connection path between the optical coupler 21 and each single ONT device 27 via the optical switching unit 23 in the above optimal accommodation state. The frequency of switching the usable band in the PON transmission communication in each ONT single device 27 is reduced.

  In addition, when the switching of the optical connection path (line) is controlled, the control unit 31 actually executes predetermined data communication on the optical connection path (line) after the switching and establishes PON communication.

  Next, an example of the connection switching method of the PON transmission apparatus of this embodiment will be described. For example, first, in the monitoring process, the traffic information per unit time is collected by the statistical information collection unit 17 in order to monitor the communication status of each ONT single device 27 (traffic information collection process). In the connection analysis step, the optimal connection of the optical signals between the plurality of optical couplers 21 and the plurality of ONT single devices 27 based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29. In other words, the optimum connection relationship between the external termination device (for example, the ONT single device) on each upper line 13 side and each ONT single device 27 via each CH unit 15a or the like is analyzed. In other words, the analysis unit 29 specifies the optimum combination of connections of the ONT single device 27 from the traffic information per unit time collected by the statistical information collection unit 17 every time the designated monitoring period (unit time) elapses. To do.

  Further, in the connection analysis step, the analysis result is stored and held in a memory or the like (storage step), and when switching of the optical connection path is necessary, when the traffic of the optical connection path before the switching is low as the switching timing, Preferably, when the traffic is zero, the analysis result data stored and held in the memory or the like is transmitted to the control unit 31 to prompt the execution of the switching process.

  Subsequently, in the connection switching step, a control signal that instructs the optical switching unit 23 to switch to the optical connection path (line) corresponding to the analysis result is output from the control unit 31 that has captured the analysis result data. .

  As a result, the optical switching unit 23 optimizes the optical signal connection relationship between the plurality of optical couplers 21 and the plurality of ONT single devices 27, that is, each host via each CH unit (CH1) 15a. In order to optimize the connection relationship between the external termination device (for example, the ONT single device) on the line 13 side and the ONT single device 27 shown in FIG. The connection of the optical input / output port on the side is switched to the connection to the optical input / output port 33 leading to the CH unit (CH2) 15b and the like.

  Thereafter, in the PON communication establishment process, the control unit 31 performs predetermined data communication between the CH unit (CH2) 15b and the ONT single device 27 to perform reconnection control and establish PON communication. .

  In this way, by dynamically switching the optical connection path (line) of the optical switching unit 23, it is possible to eliminate a situation in which the performance (dynamic bandwidth allocation) of one ONT single device 27, for example, falls in the daytime, It is possible to optimize the PON communication environment in which each ONT single device 27 can coexist with each other.

  Next, the connection switching program of the PON transmission apparatus of this embodiment executed by the control unit (CPU) 31 will be described. FIG. 2 is a flowchart showing a connection switching program of the PON transmission apparatus of this embodiment.

  First, in step 201, the statistical information collection unit 17 is activated to monitor the communication status of each ONT single device 27 as each terminal device, and the traffic information of each ONT single device 27 is collected. In step 202, based on the monitoring result of each communication status, that is, traffic information, the analysis unit 29 is caused to analyze the optimum connection relationship of the optical connection path between the plurality of optical couplers and each ONT single device 27.

  When the analysis unit 29 analyzes in step 203, the analysis result is stored in a memory or the like every predetermined unit time, and when connection switching of the optical connection path is necessary in step 204, when the traffic of the connection is low, The determination is preferably made at zero. When this is determined, in step 205, the analysis result is transmitted to the control unit (CPU) 31 so that the control unit 31 recognizes the analysis result.

  In step 206, a control signal is output to the optical switching unit 23 in order to optimize the connection relationship of the optical connection paths between the plurality of optical couplers 21 and the individual ONT unit devices 27 based on the analysis result. Switch the optical connection path. When switching the optical connection path of the optical switching unit 23, the control unit 31 appropriately disperses the connection relation of the optical connection path from the state of each traffic based on the analysis result so as to reduce the concentration of the traffic. Switch to. In step 207, when PON communication is established by transmitting / receiving predetermined data with the new connection relationship, the process returns to step 201.

  As described above, in the present embodiment, the PON communication status (traffic) is monitored and analyzed, and each ONT single device 27 is dynamically switched to an optimal accommodation state. It is possible to reduce the frequency of limiting the usable bandwidth in communication. Since the accommodation of each ONT single device 27 can be dynamically changed, the ONT single device can be installed or added without considering the degradation of performance (dynamic bandwidth allocation) and regardless of the wiring connection status. In this case, it is possible to easily realize optimization of the accommodation status of the ONT single device. In addition, since traffic information per unit time is constantly monitored and accumulated, the network administrator can grasp the performance status of each accommodated line and easily consider whether or not to add a network in a short time. There is an advantage that it becomes possible.

  Next, a PON transmission apparatus according to the second embodiment of the present invention will be described. FIG. 3 is a block diagram showing the configuration of the PON transmission apparatus according to the second embodiment.

  In FIG. 3, the PON transmission device Ps 2 is provided with monitoring means (hereinafter referred to as “statistical information collecting unit”) 17 in a plurality of upper lines 13 such as an optical network, and the optical input / output on the lower side of the statistical information collecting unit 17 A PON communication unit 19 having a plurality of optical communication units (hereinafter referred to as “CH units”) 15 a, 15 b, 15 c, and 15 d individually connected to the port is provided for each port. Are provided with a plurality of first stage optical couplers 21 via optical transmission lines. The PON transmission device Ps2 further includes an optical switching means (hereinafter referred to as an “optical switching unit”) 23 via an optical transmission line for each first-stage optical coupler 21, and is provided on the lower side of the optical switching unit 23. Among each optical input / output port, a predetermined optical input / output port has a plurality of second-stage optical couplers 25 via optical transmission lines, and each second-stage optical coupler 25 has a plurality of optical transmission lines via the optical transmission lines. The terminal device (hereinafter referred to as “ONT single device”) 27 is provided.

  A connection analysis unit (hereinafter referred to as “analysis unit”) 29 is connected to the data signal output port of the statistical information (monitoring result) of the statistical information collection unit (monitoring unit) 17, and the PON communication unit 19 includes control means (hereinafter referred to as “control unit”) 31 that inputs electrical signal data of the analysis result of the analysis unit 29 and switches connection of an output destination with respect to the input of the optical signal in the optical switching unit 23. It has been. Here, the optical transmission path on the lower side of each of the second-stage optical couplers may contain a larger number of termination devices (ONT single devices) via a predetermined number of optical couplers. .

  In the case of this example, as shown in FIG. 3, the first stage optical couplers 21 are individually provided corresponding to the four CH units 15a to 15d. Each first-stage optical coupler 21 has a configuration for branching an optical signal into eight, and each second-stage optical coupler 25 has a configuration for branching an optical signal into four. Therefore, a total of 32 ONT unit devices 27 can be accommodated in each CH unit 15a and the like. Each second-stage optical coupler 25 can accommodate a maximum of four ONT single devices 27, but in this example, the four ONT single devices 27 are grouped together and managed in order. These are referred to as a single group A, a management single group B, a management single group C, and a management single group D.

  The configuration of each CH unit 15a and the like is the same as the configuration described in the first embodiment, and thus detailed description thereof is omitted.

  The statistical information collection unit (monitoring means) 17 is provided between an external terminal device (for example, an ONT single device) on each upper line 13 side via each CH unit 15a and the like and each ONT single device 27 shown in FIG. At the time of communication, the traffic information per unit time for each management unit A group, B group, C group, and D group is collected, and data of the collection result (monitoring result) is output to the analysis unit 29. In this case, the unit time for collecting traffic information may be arbitrarily set.

  The optical switching unit 23 includes upper optical input / output ports (see FIG. 4) 33 communicating with the first-stage optical couplers 21 and lower optical input / output ports communicating with the second-stage optical couplers 25 (see FIG. 4). 4) and an optical switch that dynamically switches an optical connection path (line) to 35 in accordance with a control signal from the control unit 31. In this case as well, an electronic switch, an all-optical switch, an n × n optical matrix switch, or the like can be used as the optical switch, but the optical connection path (line) is dynamically switched regardless of this. Any optical switch may be used.

  The ONT (Optical Network Terminal) single device 27 is a media converter having a configuration corresponding to PON communication, for example, with a computer or the like.

  On the other hand, first, the analysis unit 29 takes in the traffic information per unit time collected by the statistical information collection unit 17 and analyzes the communication status of each ONT unit 27 for 24 hours, and stores the analysis result in the memory. Etc. Second, a time zone (timing) in which traffic is low or zero is detected from the analysis result of the communication status of each ONT unit 27 for 24 hours, and the analysis result data is transmitted to the control unit 31 at that timing. To do.

  The control unit 31 includes, for example, a CPU, and firstly controls each CH unit 15 of the PON communication unit 19 to realize communication with a plurality of ONT unit devices 27 accommodated in each CH unit 15a, etc. Manage the information needed for Second, when the analysis result data transmitted from the analysis unit 29 at the above timing is taken in, the connection switching control signal is sent to the optical switching unit 23 in order to optimize the optical connection path (line) of the optical switching unit 23. Is output. When the control unit 31 optimizes the optical connection path of the optical switching unit 23, specifically, the optical input / output port 33 on the upper side of the optical switching unit 23 and the optical input / output port 33 of the optical switching unit 23 are reduced in order to reduce excessive traffic concentration on one communication path. A control signal for appropriately distributing and controlling the connection relation of the lower-order optical input / output ports 35 is generated and output to the optical switching unit 23. As a result, the control unit 31 specifies the optimal combination of accommodation states of each ONT single device 27 or each management single unit A group, etc., and sets the optical connection path between the first-stage coupler 21 and the second-stage coupler 25 as described above. The frequency of restricting the usable bandwidth in the PON transmission communication in each ONT single device 27 is reduced.

  In addition, when the switching of the optical connection path (line) is controlled, the control unit 31 actually executes predetermined data communication on the optical connection path (line) after the switching and establishes PON communication.

  Next, an example of the connection switching method of the PON transmission apparatus of this embodiment will be described. FIG. 4 is an explanatory diagram for explaining a specific example when the optical connection path (line) is switched around the optical switching unit 23.

  First, as shown in FIG. 4, the management unit A branched to the CH unit (CH1) 15a of the PON communication unit 19 via the first-stage optical coupler 21, the optical switching unit 23, and the second-stage optical coupler 25. Group and management unit B group are accommodated, and the management unit C branched through the first stage optical coupler 21, the optical switching unit 17, and the second stage optical coupler 25 in the CH unit (CH3) 15c. It is assumed that the group and the management unit D group are accommodated. It is assumed that no accommodation destination exists in the CH unit (CH2) 15b and the CH unit (CH4) 15d.

  Here, an operation for switching the management unit C group from accommodation of the CH unit (CH3) 15c to accommodation of the CH unit (CH2) 15b will be described. First, in the monitoring process, in order to monitor the communication status of each of the management unit A group, the management unit B group, the management unit C group, and the management unit D group, the statistical information collection unit (monitoring means) 17 Collect traffic information per unit time (traffic information collection process). In the connection analysis step, the light between the plurality of first stage optical couplers 21 and the plurality of second stage optical couplers 25 based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29. Optimal connection relationship of signals, that is, an external termination device (for example, ONT single device) on each upper line 13 side via each CH unit 15a and the like and each management single unit A group, B group, C group, D group Analyze the optimal connection relationship with. In other words, every time the designated monitoring period (unit time) elapses, the analysis unit 29 identifies an optimal combination of management single groups from the traffic information for each unit time collected by the statistical information collection unit 17.

  In the connection analysis step, the analysis result is stored and held in a memory or the like (storage step). When switching of the optical connection path is necessary, when the traffic of the optical connection path before the switching is low, preferably the traffic is When zero, the analysis result data stored and held in the memory or the like is transmitted to the control unit 31 to prompt execution of the switching process.

  By the way, for example, it is assumed that a large amount of traffic is always observed in the management unit D group accommodated in the CH unit (CH3) 15c after the monitoring period has elapsed, regardless of the time zone. On the other hand, in the management single unit C group accommodated in the same CH unit (CH3) 15c, it is assumed that a large amount of traffic competition is observed every day at a certain time in the daytime, and a significant performance degradation occurs.

  In this case, the analysis unit 29 determines to switch the optical connection path (line) of the management single unit C group to the CH unit (CH2) 15b which is not accommodated at that time from the above monitoring result, That is, in this case, the determined content is notified to the control unit 31 at night when the data amount of the management single group C is small.

  Subsequently, in the connection switching step, a control signal that instructs the optical switching unit 23 to switch to the optical connection path (line) corresponding to the analysis result is output from the control unit 31 that has captured the analysis result data. .

  As a result, the optical switching unit 23 optimizes the optical signal connection relationship between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25, that is, the respective CH units (CH1) 15a and the like. In order to optimize the connection relationship between the external terminating device (for example, the ONT single device) on the upper line 13 side, the management single unit C group, and the management single unit D group via the route, it leads to the lower management single unit C group. The connection of the optical input / output port on the upper side with respect to the optical input / output port 35 is changed from the connection indicated by the dotted line, that is, the connection with the optical input / output port leading to the CH unit (CH3) 15c, to the connection indicated by the solid line, that is, the CH unit. Switch to the connection to the optical input / output port 33 leading to (CH2) 15b.

  After that, in the PON communication establishment process, the control unit 31 performs predetermined data communication between the CH unit (CH2) 15b and the management single unit C group, performs reconnection control, and establishes PON communication.

  In this way, by dynamically switching the optical connection path (line) of the optical switching unit 23, the situation in which performance (dynamic bandwidth allocation) decreases due to competition in the daytime between the management single unit C group and the management single unit D group is solved. And can be optimized for a PON communication environment that can coexist with each other.

  Next, another example of the connection switching method of the PON transmission apparatus of this embodiment will be described. FIG. 5 is an explanatory diagram for explaining another specific example when the optical connection path (line) is switched around the optical switching unit 23.

  First, as shown in FIG. 5, the management unit A branched to the CH unit (CH1) 15a of the PON communication unit 19 via the first-stage optical coupler 21, the optical switching unit 23, and the second-stage optical coupler 25. Group and management unit B group are accommodated, and the CH unit (CH2) 15b includes a management unit C group branched via the first stage optical coupler 21, the optical switching unit 17, and the second stage optical coupler 25. The management unit D group branched via the first-stage optical coupler 21, the optical switching unit 17, and the second-stage optical coupler 25 is accommodated in the CH unit (CH3) 15c. And It is assumed that no accommodation destination exists in the CH unit (CH4) 15d.

  Here, the operation of switching the management single unit A group from the accommodation of the CH unit (CH1) 15a to the CH unit (CH2) 15b will be described. First, in the monitoring process, in order to monitor the communication status of each of the management unit A group, the management unit B group, the management unit C group, and the management unit D group, the statistical information collection unit 17 performs monitoring for each unit time. Collect traffic information (traffic information collection step). In the connection analysis step, the light between the plurality of first stage optical couplers 21 and the plurality of second stage optical couplers 25 based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29. Optimal connection relationship of signals, that is, an external termination device (for example, ONT single device) on each upper line 13 side via each CH unit 15a and the like and each management single unit A group, B group, C group, D group Analyze the optimal connection relationship with. In other words, every time the designated monitoring period (unit time) elapses, the analysis unit 29 identifies an optimal combination of management single groups from the traffic information for each unit time collected by the statistical information collection unit 17.

  In the connection analysis step, the analysis result is stored and held in a memory or the like (storage step). When switching of the optical connection path is necessary, when the traffic of the optical connection path before the switching is low, preferably the traffic is When zero, the analysis result data stored and held in the memory or the like is transmitted to the control unit 31 to prompt execution of the switching process.

  By the way, for example, when the monitoring period has elapsed, it is assumed that the management unit A group and the management unit B group both observe that a large amount of traffic competes at night in the analysis unit 29. The analysis unit 29 determines that the management unit B group is accommodated in the same CH unit (CH2) 15b as the management unit C group with relatively little night traffic, and notifies the control unit 31 in the daytime.

  In this case, the analysis unit 29 determines to switch the optical connection path (line) of the management single unit B group to the CH unit (CH2) 15b that is not accommodated at that time from the above monitoring result, That is, in this case, the determined content is notified to the control unit 31 during the daytime when the data amount of the management single group C is small.

  Subsequently, in the connection switching step, a control signal that instructs the optical switching unit 23 to switch to the optical connection path (line) corresponding to the analysis result is output from the control unit 31 that has captured the analysis result data. .

  As a result, the optical switching unit 23 optimizes the optical signal connection relationship between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25, that is, the respective CH units (CH1) 15a and the like. In order to optimize the connection relationship between the external termination device (for example, the ONT single device) on the upper line 13 side and the management single unit A group and the management single unit B group via the route, it leads to the lower management single unit B group The connection of the optical input / output port on the upper side with respect to the optical input / output port 35 is changed from the connection indicated by the dotted line in FIG. Switch to the connection to the optical input / output port 33 leading to (CH2) 15b.

  Thereafter, in the PON communication establishment step, the control unit 31 performs predetermined data communication between the CH unit (CH2) and the management single unit C group to perform reconnection control and establish PON communication.

  In this way, by dynamically switching the optical connection path (line) of the optical switching unit 23, the nighttime conflict between the management single unit A and the management single unit B group can be resolved, and the management single unit B group and the management single unit C Groups can be optimized for PON communication environments that can coexist without significant impact on each other.

  Next, the connection switching program of the PON transmission apparatus of this embodiment executed by the control unit (CPU) 31 will be described. FIG. 6 is a flowchart showing a connection switching program of the PON transmission apparatus of this embodiment.

  First, similarly to the above-described example, the management unit branched to the CH unit (CH1) 15a of the PON communication unit 19 via the first-stage optical coupler 21, the optical switching unit 23, and the second-stage optical coupler 25. The single unit A group and the single management group B are accommodated, and the CH unit (CH3) 15c is branched through the first stage optical coupler 21, the optical switching unit 17, and the second stage optical coupler 25. Assume that a single group C and a management single group D are accommodated. It is assumed that no accommodation destination exists in the CH unit (CH2) 15b and the CH unit (CH4) 15d.

  Here, an operation for switching the management unit C group from accommodation of the CH unit (CH3) 15c to accommodation of the CH unit (CH2) 15b will be described. First, in step 601, in order to monitor the communication status of each of the management unit A group, the management unit B group, the management unit C group, and the management unit D group, the statistical information collection unit 17 is informed of each unit time. Collect traffic information. Optical connection paths between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25 based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29 in step 602 That is, an external termination device (for example, an ONT single device) on each side of the upper line 13 via each CH unit 15a, etc., and each management single unit A group, B group, C group, and D group Analyzes the optimal connection relationship. In other words, every time the designated monitoring period (unit time) elapses, the analysis unit 29 identifies an optimal combination of management single groups from the traffic information for each unit time collected by the statistical information collection unit 17.

  Subsequently, when the analysis result is stored and held in a memory or the like in step 603 and the optical connection path needs to be switched in step 604, the traffic is preferably zero when the traffic of the optical connection path before the switching is low. At the time of this determination, the analysis result data stored and held in the memory or the like in step 605 is transmitted to the control unit 31 to prompt execution of the switching process.

  Note that, for example, the analysis unit 29 always observes a large amount of traffic regardless of the time zone of the management unit D group accommodated in the CH unit (CH3) 15c, while accommodating in the same CH unit (CH3) 15c. Suppose that the managed single group C observes a large amount of traffic competition at a certain time in the daytime and analyzes a significant decrease in performance.

  In this case, the analysis unit 29 determines to switch the optical connection path (line) of the management single unit C group to the CH unit (CH2) 15b which is not accommodated at that time from the above monitoring result, That is, in this case, the determined content is notified to the control unit 31 at night when the data amount of the management single group C is small.

  Subsequently, in step 606, the control unit 31 that has fetched the data of the analysis result outputs a control signal that instructs the optical switching unit 23 to switch to the optical connection path (line) corresponding to the analysis result.

  As a result, the optical switching unit 23 optimizes the optical signal connection relationship between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25, that is, the respective CH units (CH1) 15a and the like. In order to optimize the connection relationship between the external terminating device (for example, the ONT single device) on the upper line 13 side, the management single unit C group, and the management single unit D group via the route, it leads to the lower management single unit C group. The connection of the optical input / output port on the upper side with respect to the optical input / output port 35 is changed from the connection indicated by the dotted line in FIG. Switch to the connection to the optical input / output port 33 leading to (CH2) 15b.

  Thereafter, when the control unit 31 performs predetermined data communication between the CH unit (CH2) 15b and the management single unit C group in step 607 to perform reconnection control and establishes PON communication, step 601 is performed. Return to.

  In this way, by dynamically switching the optical connection path (line) of the optical switching unit 23, the situation in which performance (dynamic bandwidth allocation) decreases due to competition in the daytime between the management single unit C group and the management single unit D group is solved. And can be optimized for a PON communication environment that can coexist with each other.

  As described above, in the present embodiment, the PON communication status (traffic) is monitored and analyzed, and the management unit A group, B group, C group, and D group including the plurality of ONT unit devices 27 are optimally accommodated. Since the state is dynamically switched to each state, the frequency of limiting the usable bandwidth in the PON transmission communication in each management single group A, B, C, and D can be reduced. Since the accommodation of each management unit A group, B group, C group, and D group can be dynamically changed, management is possible without considering the performance (dynamic bandwidth allocation) degradation and further regardless of the wiring connection status. It is easy to install or add a single group (ONT single unit), and at that time also optimize the accommodation status of the management single group A, B, C, D group (ONT single unit) It can be easily realized. In addition, since traffic information per unit time is constantly monitored and accumulated, the network administrator can grasp the performance status of each accommodated line and easily consider whether or not to add a network in a short time. There is an advantage that it becomes possible.

  Next, a PON transmission apparatus according to the third embodiment of the present invention will be described. FIG. 7 is a block diagram showing the configuration of the PON transmission apparatus according to the third embodiment. In FIG. 7, the same parts as those shown in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 7, the PON transmission device Ps3 includes predetermined second-stage optical couplers 25a and 25b among the second-stage optical couplers 25, and predetermined ONT single-unit devices (hereinafter referred to as “individual management single-units” among a plurality of ONT single-unit devices 27. It differs from the case of the second embodiment in that an optical switching unit 43 that can dynamically and arbitrarily switch the optical connection path between them is provided between 27a, 27b, 27c, and 27d. To do.

  The optical switching unit 43 has an optical switch configuration similar to the optical switching unit 23, except that the number of optical connection paths (number of lines) is smaller than that of the optical switching unit 23.

  In the case of the present embodiment, a more effective individual management unit is provided by further reducing the management unit of the management unit group, that is, the individual management unit (ONT unit device) that provides the optical switching unit 43 to switch the optical connection path. (ONT single device) It is possible to realize a combination of accommodation of 27a, 27b, 27c, and 27d.

  The statistical information collection unit (monitoring means) 17 collects traffic information for each unit time in the management single group A and B, and also monitors and collects traffic information of the individual management single units 27a, 27b, 27c, and 27d. The analysis unit 29 specifies the optimum combination of the management simplex A group and the B group from the traffic information collected by the statistical information collection unit 17, and further, the combination of the individual management simplexes 27a, 27b, 27c, and 27d. Also specify optimization. Based on the notification of the analysis result from the analysis unit 29, the control unit 31 also determines the necessity of switching between the individual management units 27a, 27b, 27c, and 27d, and switches the optical connection path of the optical switching unit 23. In addition, the optical switching path 43 is also instructed to execute switching of the optical connection path (output of a control signal).

  First, as shown in FIG. 8, the individual management unit (ONT unit device) 27a is connected to the second-stage optical coupler 25a via the optical connection path 43a indicated by the dotted line in the optical switching unit 43. 27b, 27c, and 27d exemplify a case where each is connected to the second stage optical coupler 25b via the optical connection paths 43c, 43d, and 43e in the optical switching unit 43.

  First, in the monitoring process, in order to monitor the communication status of each of the management unit A group, the management unit B group, and the individual management units 27a, 27b, 27c, and 27d, the traffic per unit time is collected by the statistical information collection unit 17. Collect information (traffic information collection process). In the connection analysis process, the management unit A group, the management unit B group, and the individual management units 27a, 27b, 27c, and 27d are optimized based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29. That is, the optimum connection relationship between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25, 25a, 25b, and the second-stage optical couplers 25a, 25b and the individual management unit 27a. , 27b, 27c are analyzed.

  In the connection analysis step, the analysis result is stored and held in a memory or the like (storage step). When switching of the optical connection path is necessary, when the traffic of the optical connection path before the switching is low, preferably the traffic is When zero, the analysis result data stored and held in the memory or the like is transmitted to the control unit 31 to prompt execution of the switching process.

  Now, for example, it is assumed that the competition of the traffic of the individual management units 27b, 27c, and 27d is observed and a significant performance (dynamic bandwidth allocation) decrease occurs. In this case, in the connection analysis step, for example, the individual management unit 27b is accommodated in the same CH unit (CH3) 15c as the individual management unit 27a via the second-stage optical coupler 25b with relatively little traffic. Is stored in a memory or the like. For this reason, in the case of this example, the connection switching step shown in the second embodiment is not necessary, and a second connection switching step described later is performed.

  Subsequently, in the second connection switching step, a control signal for instructing the optical switching unit 43 to switch to the optical connection path (line) corresponding to the analysis result from the control unit 31 that has captured the data of the analysis result. Is output. As a result, the optical switching unit 43 switches the optical connection path of the individual management unit 27b from the optical connection path 43c to the optical connection path 43b, and this switching causes the CH unit (CH3) 15c to accommodate the individual management unit 27b. That is, in the second connection switching step, the connection relationship of the individual management units 27b, 27c, and 27d is appropriately distributed from the state of each traffic based on the analysis result in order to reduce the excessive concentration of the traffic.

  Thereafter, in the PON communication establishment step, the control unit 31 performs predetermined data communication between the CH unit (CH2) and the individual management unit 27b to perform reconnection control and establish PON communication.

  Thus, by dynamically switching the optical connection path (line) of the optical switching unit 43, the conflict between the individual management units 27b, 27c, and 27d can be resolved, and the individual management units 27b, 27c, and 27d are large to each other. It is possible to optimize the PON communication environment that can coexist without affecting.

  Next, the connection switching program of the PON transmission apparatus of this embodiment executed by the control unit (CPU) 31 will be described. FIG. 9 is a flowchart showing a connection switching program of the PON transmission apparatus of this embodiment.

  Also in this case, as shown in FIG. 8, the individual management unit 27a is connected to the second stage optical coupler 25a via the optical connection path 43a in the optical switching unit 43, and the individual management units 27b, 27c, 27d are The case where each is connected to the second stage optical coupler 25b via the optical connection paths 43c, 43d, 43e in the optical switching unit 43 is illustrated.

  First, in step 901, in order to monitor the communication status of each of the management unit A group, the management unit B group, and the individual management unit (ONT unit apparatus) 27a, 27b, 27c, and 27d, the statistical information collection unit 17 uses the unit. Collect traffic information per hour. Based on the traffic information per unit time collected by the statistical information collection unit 17 by the analysis unit 29 in step 902, the optimum connection of the management unit A group, the management unit B group, and the individual management units 27a, 27b, 27c, and 27d Relationship, that is, the optimum connection relationship between the plurality of first-stage optical couplers 21 and the plurality of second-stage optical couplers 25, 25a, 25b, and the second-stage optical couplers 25a, 25b and the individual management units 27a, 27b. 27c is analyzed.

  Now, for example, it is assumed that traffic competition of individual management single units (ONT single units) 27b, 27c, and 27d is observed and a significant performance (dynamic bandwidth allocation) decrease occurs. In this case, in the above step 902, as the result of the analysis by the analysis unit 5, for example, the individual management unit 27b is converted into the same CH unit (CH3) as the individual management unit 27a via the second-stage optical coupler 25b with relatively little traffic. In step 903, the analysis result is held in a memory or the like.

  In step 904, when the traffic of the optical connection path before the switching is low, preferably it is determined that the traffic is zero, and in step 905, the analysis result data stored in the memory or the like is transmitted to the control unit 31. Prompt to execute the switching process.

  Subsequently, in step 906, the control unit 31 that has fetched the data of the analysis result outputs a control signal that instructs the optical switching unit 43 to switch to the optical connection path (line) corresponding to the analysis result. As a result, the optical switching unit 43 switches the optical connection path of the individual management unit (ONT single unit) 27b from the optical connection path 43c to the optical connection path 43b, and by this switching, the individual management unit 27b for the CH unit (CH3) 15c. Contain. That is, in step 906, processing for appropriately distributing the connection relationship of the individual management units 27b, 27c, and 27d is performed in order to reduce the excessive concentration of the traffic from the state of each traffic based on the analysis result.

  After that, in step 907, predetermined data communication is performed between the CH unit (CH3) 15c and the individual management single unit (ONT single unit) 27b, reconnection control is performed, and PON communication is established. Return to step 901.

  Thus, by dynamically switching the optical connection path (line) of the optical switching unit 43, the conflict between the individual management units 27b, 27c, and 27d can be resolved, and the individual management units 27b, 27c, and 27d are large to each other. It is possible to optimize the PON communication environment that can coexist without affecting.

  As described above, in the present embodiment, the PON communication status (traffic) is monitored and analyzed, and the management unit A group, the B group, and the individual management units 27a, 27b, 27c, and 27d are brought into an optimal accommodation state. Since the switching is performed dynamically, the frequency of limiting the usable bandwidth in the PON transmission communication in each of the management single units A and B and the individual management single units 27a, 27b, 27c, and 27d can be reduced. Since the accommodation of each management unit A group, B group, and individual management units 27a, 27b, 27c, and 27d can be dynamically changed, it is possible to further reduce the performance (dynamic bandwidth allocation) and further reduce the wiring connection status. However, it is also easy to install or add the individual management units 27a, 27b, 27c, and 27d, and in that case also optimize the accommodation status of the individual management units 27a, 27b, 27c, and 27d. Can be easily realized.

  Next, a PON transmission apparatus according to the fourth embodiment of the present invention will be described. FIG. 10 is a block diagram showing the configuration of the PON transmission apparatus according to the fourth embodiment. In FIG. 10, the same parts as those shown in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 10, the PON transmission apparatus Ps4 is the case where the statistical information collection unit (monitoring means) 17 is installed in the optical transmission path between the optical switching unit 23 and the second stage optical coupler 25 in the second embodiment. And different.

  Further, the configuration of the statistical information collection unit 17 is exactly the same as the configuration of the second embodiment, and the connection switching method and the connection switching program of the PON transmission apparatus according to the present embodiment are also the case of the second embodiment. It is the same.

In addition, although the case of two stages was illustrated about the optical coupler, it may be one stage or may be multistage of three stages or more.
It is a block diagram which shows the structure of the PON transmission apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows the connection switching program of the PON transmission apparatus which concerns on 1st Embodiment. It is a block diagram which shows the structure of the PON transmission apparatus which concerns on 2nd Embodiment. It is explanatory drawing explaining the example of a switching of the optical connection path | route of the optical switching part of the PON transmission apparatus which concerns on 2nd Embodiment. It is explanatory drawing explaining the other example of a switching of the optical connection path | route of the optical switching part of the PON transmission apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the connection switching program of the PON transmission apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the PON transmission apparatus which concerns on 3rd Embodiment. It is explanatory drawing explaining the example of switching of the optical connection path | route of the optical switching part of the PON transmission apparatus which concerns on 3rd Embodiment. It is a block diagram which shows the connection switching program of the PON transmission apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the PON transmission apparatus which concerns on 4th Embodiment. It is a block diagram which shows the structure of the conventional PON transmission apparatus.

Explanation of symbols

Ps1, Ps2, Ps3, Ps4 PON transmission device 13 Host line 15 CH unit (optical communication unit)
15a, 15b, 15c, 15d CH unit (optical communication unit)
17 Statistical information collection unit (monitoring means)
19 PON communication unit 21 Optical coupler (first stage optical coupler)
23 Light switching part (light switching means)
25 2nd stage optical coupler 25a, 25b 2nd stage optical coupler 27 ONT unit device (terminating device)
27a, 27b, 27c, 27d ONT single device (termination device)
29 Analysis unit (connection analysis means)
31 Control part (control means)
33, 35 Optical input / output port 43 Optical switching unit (optical switching means)
43a, 43b, 43c, 43d, 43e Optical connection path

Claims (21)

A plurality of optical communication units, a transmission system including a plurality of branch paths branched from the optical communication unit, and a plurality of ONT single devices individually installed in the plurality of transmission systems. In the PON transmission apparatus configured to perform PON communication with the optical communication unit via the branch path,
There is provided monitoring means for constantly monitoring traffic information between each optical communication unit and the corresponding ONT unit, and the operation is based on this traffic information and the traffic is less than the connection of each optical communication unit. PON transmission device that can switch and connect the ONT single unit of the optical communication unit of this unit, thereby setting the optimum line connection. A plurality of optical communication units for communicating with the network;
A plurality of optical couplers for branching an optical signal from the optical communication unit;
In a PON transmission device including an individual input of an optical signal branched by each of the optical couplers and a plurality of termination devices for transmitting the optical signal to the optical coupler via an optical transmission path,
Comprising optical switching means capable of arbitrarily switching optical connection paths between the plurality of optical couplers and the plurality of termination devices in order to switch the connection of each termination device;
While providing a monitoring means for monitoring the communication status of each of the terminal devices,
Equipped with connection analysis means for analyzing the optimal connection relation of the optical connection path of the optical switching means to optimize the connection of the termination device based on the monitoring result of each communication status,
A PON transmission apparatus comprising: a control unit that controls switching of the optical connection path of the optical switching unit based on an analysis result of the connection analysis unit. A plurality of optical communication units for communicating with the network;
A plurality of first-stage optical couplers provided corresponding to the respective optical communication units and branching optical signals from the respective optical communication units;
A plurality of second stage optical couplers for branching the optical signal branched by each first stage optical coupler,
In a PON transmission device including a plurality of termination devices that perform PON transmission communication with each of the optical communication units via an optical transmission path,
Optical switching means capable of arbitrarily switching optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers in order to switch the connection of the terminal devices; and communication status of the terminal devices And monitoring means for monitoring
Connection analysis means for analyzing the optimum connection relation of the optical connection path of the optical switching means to optimize the connection of the termination device based on the monitoring results of the communication states;
A PON transmission apparatus comprising: a control unit that controls switching of the optical connection path of the optical switching unit based on an analysis result of the connection analysis unit.   4. The PON transmission apparatus according to claim 2, wherein an arbitrary number of optical couplers are included in the optical transmission path.   5. The PON transmission apparatus according to claim 1, wherein the monitoring unit is provided on an upper side or a lower side of the optical communication for each of the optical communication units.   5. The PON transmission apparatus according to claim 3, wherein the monitoring unit is provided between the optical switching unit and the plurality of second-stage optical couplers.   The PON transmission apparatus according to claim 1, wherein the monitoring unit includes a statistical information collecting unit that collects traffic information that is statistical information of each communication.   The connection analyzing unit analyzes an optimal connection relation of the optical connection path of the optical switching unit in order to optimize the connection of the termination device based on the traffic information collected by the monitoring unit. The PON transmission apparatus according to claim 2, wherein the PON transmission apparatus is configured as follows.   The connection analysis unit holds the analysis result, and when the connection switching of the optical connection path of the optical switching unit is necessary, transmits the analysis result to the control unit when the traffic of the connection is low. The PON transmission apparatus according to claim 2, wherein An optical switching means capable of arbitrarily switching an optical connection path between a part of the plurality of second-stage optical couplers and a part of the terminal devices among the terminal devices;
The PON transmission apparatus according to claim 3, wherein the optical switching unit switches the connection relationship of the optical connection paths based on the control of the control unit.   The PON transmission according to any one of claims 2 to 10, wherein the control unit establishes PON communication with the new connection relationship when the connection relationship of the optical switching unit is appropriately switched. apparatus. A plurality of first-stage optical couplers for branching a plurality of optical signals from a plurality of optical communication units for performing communication with a network and a plurality of second stage housing a plurality of termination devices for switching the connection of the termination devices. A connection switching method for a PON transmission device that arbitrarily switches an optical connection path between a stage optical coupler,
A monitoring step of monitoring the communication status of each terminal device;
A connection analysis step of analyzing an optimal connection relationship of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on the monitoring results of the communication states;
A connection switching step of switching a connection relationship of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on the analysis result;
A connection switching method for a PON transmission apparatus.   The PON transmission apparatus connection switching method according to claim 12, wherein the monitoring step includes a traffic information collecting step of collecting each traffic information which is statistical information of each communication.   The connection analysis step includes a storage step of storing the analysis result, and if the optical connection path needs to be switched, the connection switching step is performed when traffic of the connection is low. The connection switching method of the PON transmission device according to any one of 12 and 13.   Including a second connection switching step of switching an optical connection path between a part of the plurality of second-stage optical couplers and a part of the termination devices based on the analysis result. The PON transmission apparatus connection switching method according to claim 12, wherein:   Including a PON communication establishment step of establishing PON communication in the new connection relationship when the optical connection path is switched in at least one of the connection switching step and the second connection switching step. The connection switching method of the PON transmission device according to any one of claims 12 to 15. Light between a plurality of first stage optical couplers for branching a plurality of optical signals from a plurality of optical communication units for communicating with a network, and a plurality of second stage optical couplers accommodating a plurality of termination devices A connection switching program for a PON transmission device that arbitrarily switches a connection path,
Monitoring the communication status of each terminal device;
Analyzing an optimal connection relationship of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on the monitoring results of the communication states;
Switching the connection relation of the optical connection paths between the plurality of first-stage optical couplers and the plurality of second-stage optical couplers based on the analysis results;
PON transmission device connection switching program, characterized in that CPU is executed.   18. The PON transmission apparatus connection switching program according to claim 17, wherein the CPU executes a step of collecting each traffic information as statistical information of each communication when monitoring each communication status. The analysis result is stored when the analysis result is stored, when the connection switching of the optical signal is necessary, when the traffic of the connection is low, and when the traffic is low. Recognizing steps,
The PON transmission device connection switching program according to claim 17, wherein the CPU is executed by the CPU.   Causing the CPU to perform a step of switching an optical connection path between a part of the plurality of second-stage optical couplers and a part of the termination devices based on the analysis result. The PON transmission device connection switching program according to any one of claims 17 to 19, characterized in that:   21. The PON transmission apparatus according to claim 17, wherein when the connection relation is appropriately switched, the CPU is caused to execute a step of establishing PON communication with the new connection relation. Connection switching program.

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