JPH10164071A - Vp/vc handling atm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To share a VP/VC handling ATM device with a VP handling device so as to facilitate mutual transfer by constituting a VC layer processing function in a repeating side processing part as an independent circuit and exchanging only the repeating processing part in the VP/VC handling ATM device. SOLUTION: The repeating side processing part 6 is provided with a physical layer processing function and a VP/VC layer cell processing function independent of other parts. The P/VC handling ATM device 1 executes physical/VP layer processings on cells from a terminal 10 in a subscriber side processing part 4 and a cell exchange processing part 5, sends them to the repeating processing part 6, executes the processing of a physical layer, a VP layer and a VCL layer and sends them to the CP/VC handling ATM device 11 of a next stage. The repeating side processing part 6 executes the physical layer/VP layer/VC layer processings on the cells sent from the ATM device 11 and transmits them to the terminal 10 through the cell exchange processing part 5 and the subscriber side processing part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM (Asynchronous Transfer Mode) network,
VP handling function for performing VP layer cell processing and V
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VP / VC handling ATM device having both a VC handling function for performing cell processing of a C layer and, more particularly, to a VP / VC handling ATM device which facilitates addition and deletion of a VC handling function.

[0002]

2. Description of the Related Art A broadband integrated digital communication network (B-IS)
(DN: Broadband-Integrated Services Digital Network)
ATM is used as a transmission technique for the communication. This ATM is
For example, see the 168th edition of "Nikkei Communication Supplement ISDN Utilization Guide" (1988, published by Nikkei BP).
As described on pages 177 to 177, this is a technique for transferring information in units of fixed-length packets called cells. This AT
In M, a virtual path layer (VP layer: Virtual Pass)
And virtual channel layer (VC layer: Virtual Channel)
l) Two levels are defined. For a cell, a virtual path to which the cell belongs is identified by a VPI (Virtual Pass Identifier) bit in the header portion, and a virtual channel to which the cell belongs is identified by a VCI (Virtual Channel Identifier) bit in the header portion.

FIG. 4 shows an example of a protocol stack in a conventional ATM network. The ATM network includes terminals 31 and 32,
A VP / VC that has both a VP handling function and a VC handling function and accommodates a plurality of terminals connected by a LAN or the like including the terminals 31 and 32 and performs an ATM exchange process.
Handling ATM devices 33 and 34 and each VP / VC handling ATM device 3 having a VP handling function.
VP handling A that performs ATM exchange processing between 3 and 34
It is composed of a TM device 35 and the like.

In an information transfer phase between terminals, terminals 31 and 32 communicate with a physical layer, a VP layer, a VC layer, and an AAL (ATM adaptation layer, ATM Adap layer).
tationLayer: The third layer of the broadband ISDN protocol hierarchy model, the function of providing services with different communication characteristics on the ATM layer, such as voice, video, and data, to upper applications in accordance with the characteristics), and the upper layer Supports all of. The VP / VC handling ATM devices 33 and 34 support three layers: a physical layer, a VP layer, and a VC layer. The VP handling ATM device 35 supports two layers, a physical layer and a VP layer.

The VP / VC handling ATM device 33,
As shown in FIG. 5, the transmission unit 34 includes a transmission system processing unit 41 that performs a cell transmission process, and a control system processing unit 40 that controls the operation of the transmission system processing unit 41. In the conventional VP / VC handling ATM devices 33 and 34, the transmission system processing unit 4
1 is a subscriber processing unit 42 for accommodating the subscriber lines 36 on the terminals 31 and 32, and a VP handling ATM device 35.
It comprises a relay processing unit 43 for accommodating the relay line 37 on the side, and a cell exchange processing unit 44 for performing a cell exchange process.

The subscriber processing unit 42 and the relay processing unit 4
3 and the respective parts of the cell exchange processing section 44, the VP-O
AM (: Operation, Administration and Maintenance)
VP layer cell processing functions such as functions and VP-UPC (: Usage Parameter Control) functions, VP-based traffic observation functions, VP-based shaping functions, and VPI conversion functions; VC-OAM functions and VC-UPC functions;
A VC layer cell processing function such as a VC-based traffic observation function, a VPI / VCI conversion function, and a cell charging counter function is distributed.

[0007] The VP-OAM function is a function of monitoring the link connection and trail status of the VP layer, an information transfer function necessary for maintenance, and the like.
The UPC function is a function for checking whether the user is performing cell transmission conforming to the parameters declared to the network for each VP. The traffic observation function of each VP is a function of observing statistical information such as the number of cells arriving within a specified time, the number of lost cells, the maximum queue length, and the number of cells violating the UPC in a VP unit. When sending V
This is a function for performing cell transmission in accordance with parameters specified in P units. The VPI conversion function converts the VPI value assigned to identify the VP in the physical line from the terminal at the preceding stage or the VP / VC handling ATM device or the VP handling ATM device into the physical line to the device at the next stage. And V
This is a function of converting P into a VPI value for identifying P.

[0008] The VC-OAM function includes a function of monitoring a link connection and a trail state of a VC layer, and a function of transferring information required for maintenance.
The UPC function is a function for checking, on a per VC basis, whether a user is performing cell transmission conforming to parameters declared to the network. The traffic observation function in units of VC is a function of observing statistical information such as the number of arriving cells, the number of lost cells, and the number of UPC violating cells within a specified time in VC units.
The CI conversion function is a VPI / V assigned to identify a VC in a physical line from a terminal at the preceding stage or a VP / VC handling ATM device or a VP handling ATM device.
This function converts a CI value into a VPI / VCI value for identifying a VC in a physical line to a device at the next stage. Then, the cell priority control function performs priority discard according to the discard quality requested by the cell arriving at the time of congestion of the cell buffer, or prepares a plurality of buffers with priorities for cell extraction, and adjusts the delay quality requested by the cell. This is a function of arriving a cell in a corresponding buffer.
This is a function to count the number of transmission cells for charging the amount of information for each time.

In the conventional VP / VC handling ATM device, the above-mentioned respective processing functions required in common for both the VP layer and the VC layer are realized by the same circuit (LSI, board). As a result, the circuit can be downsized. The subscriber side processing unit 42, the relay side processing unit 43, and the cell switching processing unit 44 of the VP / VC handling ATM devices 33 and 34 can be shared with the VP handling ATM device 35. However, the VP handling ATM device 35 does not perform cell processing of the VC layer. Therefore, the subscriber-side processing unit 42, the relay-side processing unit 43, and the cell switching processing unit 44, which are configured by the same circuit that performs cell processing of both the VP layer and the VC layer of the VP / VC handling ATM devices 33 and 34, Sharing,
VP handling AT that performs cell processing only for the VP layer
The configuration of the M device 35 causes an overhead of the VC layer processing function.

An ATM including such an ATM layer
For more information, see, for example, Hiroshi Ishikawa / Isao Miyake, "Picture A
TM Network Bible "(1995, published by Ohm Co., Ltd.) and" Standard ATM Textbook "edited by Hideyoshi Tominaga / Hiroshi Ishikawa / Multimedia Communication Research Group (1995, published by ASCII Corporation).

[0011]

The problem to be solved in the prior art is that the subscriber side processing unit and the relay side processing unit of a VP / VC handling ATM device having both a VP handling function and a VC handling function. And a cell exchange processing unit cannot be shared with a VP handling ATM device having only a VP handling function without the overhead of a VC layer processing function. An object of the present invention is to solve these problems of the prior art,
Conversion of a VP / VC handling ATM device having both a VP handling function and a VC handling function to a VP handling ATM device performing only VP handling, or a VP handling ATM device performing only VP handling and a VP handling function and VC handling An object of the present invention is to provide a VP / VC handling ATM device which can be easily converted to a VP / VC handling ATM device having both functions.

[0012]

To achieve the above object, a VP / VC handling ATM device according to the present invention comprises:
(1) VP / VC handling ATM device 1 that configures an ATM network and performs cell processing for both the VP layer and the VC layer
A subscriber-side processing unit 4 that accommodates the subscriber line 7 and performs VP layer cell processing, and a relay-side process that accommodates the relay line 8 and performs VP layer cell processing and VC layer cell processing. Unit 6, a cell exchange processing unit 5 for performing cell exchange processing in VP units between the relay processing unit 6 and the subscriber processing unit 4.
And the relay side processing unit 6 is provided as a circuit independent of the subscriber side processing unit 4 and the cell switching processing unit 5. Further, (2) the VP described in the above (1)
In the / VC handling ATM device, the subscriber side processing unit 4 has at least a VP-OAM processing function, a VP-UPC processing function, a traffic observation processing function for each VP, and a VPI conversion processing function. , Has at least a traffic observation processing function in VP units, and a cell exchange processing function in VP units.
It is characterized by having at least an OAM processing function, a VC-UPC processing function, a traffic observation processing function for each VC, and a conversion processing function of VPI and VCI. Also,
(3) VP / VC handling AT described in (2) above
In the M apparatus, the subscriber-side processing unit 4 has at least a shaping processing function for each VP,
Is characterized by having at least a cell priority control processing function, a VP-based shaping processing function, and a cell charging counter processing function.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the configuration according to the present invention of the ATM device of the present invention. In the figure, reference numeral 1 denotes a VP / V having both the VP handling function and the VC handling function of the present embodiment.
C handling ATM device, 2 is a transmission processing unit for performing cell exchange processing according to the present invention, 3 is a control processing unit for controlling the operation of the transmission processing unit 2, 10 is a terminal, and 11 is an adjacent V
It is a P / VC handling ATM device. The transmission processing unit 2 according to the present invention includes a subscriber processing unit 4 and a relay processing unit 6.
And a cell exchange processing unit 5.

The subscriber-side processing unit 4 has a physical layer processing function and a VP layer cell processing function (described as “VP layer processing function” in the figure), and the cell switching processing unit 5 has a physical layer processing function. And the cell processing function of the VP layer (“V
The relay side processing unit 6 includes a physical layer processing function, a VP layer cell processing function (described as “VP layer processing function” in the drawing), and a VC layer It has a cell processing function (described as “VC layer processing function” in the figure) and is provided as a circuit independent from the subscriber side processing unit 4 and the cell switching processing unit 5.
It is connected to the subscriber side processing unit 4 via the cell switching processing unit 5. The terminal 10 is connected to the subscriber-side processing unit 4 by a subscriber line 7, and the other VP / VC handling device 11 is connected to the relay-side processing unit 6 by a relay line 8.

The operation of the VP / VC handling ATM device 1 having such a configuration will be described by taking as an example a process for a connection in which the terminal 10 and the next-stage VP / VC handling ATM device 11 are connected. From the terminal 10 to the subscriber line 7 and the user network interface (U
The VP / VC handling ATM device 1 first performs physical layer processing and VP layer processing by the subscriber side processing unit 4 on the cell transmitted through the NI: User Network Interface (NI: User Network Interface). Send to

The cell exchange processing unit 5 includes, in the cell arriving from the subscriber processing unit 4, a V that includes physical layer processing and cell exchange.
It performs P layer processing and sends it to the relay processing unit 6. The relay-side processing unit 6 performs physical layer processing, VP layer processing, and VC layer processing on the cell arriving from the cell switching processing unit 5, and sends the cell to the next-stage VP / VC handling ATM device 11,
The transmission is performed via the trunk line 8 and a network node interface (NNI).

On the contrary, VP / VC handling ATM
The VP / VC handling ATM device 1 performs the following operation for cells transmitted from the device 11 via the trunk line 8. That is, for a cell arriving from the VP / VC handling ATM device 11, first, the relay side processing unit 6 performs a physical layer process, a VP layer process, and a VC layer process, and sends it to the cell exchange processing unit 5. . The cell switching processing unit 5 performs VP layer processing including physical layer processing and cell switching on the cell arriving from the relay processing unit 6, and sends it to the subscriber processing unit 4.

The subscriber processing unit 4 performs physical layer processing and VP layer processing on the cells arriving from the cell switching processing unit 5 and sends the cells to the terminal 10 via the subscriber line 7. As described above, in the VP / VC handling ATM device 1 according to the present embodiment, the VC layer processing function is provided in the relay processing unit 6, and the relay processing unit 6 includes the subscriber processing unit 4 and the cell switching processing unit. 5 and independent circuits. Thus, the VP / VC handling ATM device 1 can be easily changed to the VP handling ATM device by exchanging only the relay processing unit 6.

FIG. 2 is a block diagram showing a second embodiment of the configuration according to the present invention of the ATM device of the present invention. This example is a VP / VC handling ATM device 1 shown in FIG.
The subscriber side processing unit 4a in the VP / VC handling ATM device 1a of the present example has a physical layer processing unit and a VP layer processing unit, and the VP layer processing unit is a VP-OAM. It has a processing function, a VP-UPC function, a traffic observation function in VP units, a shaping function in VP units, and a VPI header conversion function. The cell switching processing unit 5a has a physical layer processing unit and a VP layer processing unit. The VP layer processing unit has a traffic observation function in VP units and a cell switching function in VP units.

The relay processing unit 6a has a physical layer processing unit and a VP / VC layer processing unit. The VP / VC layer processing unit has a VP layer shaping function as a VP layer processing function. As the VC layer processing function,
VC-OAM processing function, VC-UPC function, VC-based traffic observation function, cell priority control function, and VP
It has an I / VCI header conversion function. Further, it has a cell charging counter function. A terminal (not shown) is connected to the subscriber processing unit 4a via the subscriber line 7a and the UNI.
The relay processing unit 6a includes the relay line 8a and the NN.
Another VP / VC handling ATM switching device (not shown) is connected via I.

Next, the VP / VC handling AT of this embodiment
The operation of the M device 1a will be described by taking as an example a case where the former stage of the connection is via the UNI and the latter stage is the NNI. For the cell arriving via the UNI, the subscriber side processing unit 4a first performs physical layer processing in the physical layer processing unit,
Next, the VP layer processing unit performs VP-OAM processing and VP-OAM processing.
It performs UPC processing, traffic observation processing in VP units, shaping processing in VP units, and VPI header conversion processing, and returns to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell and sends the cell to the cell switching processing unit 5a.

The cell exchange processing unit 5a includes the subscriber processing unit 4
First, the physical layer processing is performed on the cell arriving from a by the physical layer processing unit.
A traffic observation process for each VP and a cell exchange process for each VP are performed and returned to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell and sends the cell to the relay processing unit 6a. The relay processing unit 6a first performs physical layer processing on the cell arriving from the cell switching processing unit 5a in the physical layer processing unit, and then performs VC-OAM processing in the VP / VC layer processing unit. VC-UPC processing, VC
It performs unit-based traffic observation processing, cell priority control processing, VP-based shaping processing, VPI / VCI header conversion processing, and cell charging counter processing, and returns the result to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell and sends the cell to the NNI.

Conversely, the relay side processing unit 6a
VP / VC handling ATM for cells arriving at
The device 1a performs the following operation. That is, the relay processing unit 6 first performs the physical layer processing in the physical layer processing unit on the cell arriving via the NNI,
In the P / VC layer processing unit, VP / VC-OAM processing;
VC unit traffic observation processing, cell priority control processing, V
It performs P-based shaping processing, VPI / VCI header conversion processing, and cell charging counter processing, and returns the result to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell and sends the cell to the cell switching processing unit 5a.

The cell exchange processing unit 5a includes a relay processing unit 6a
First, the physical layer processing unit performs physical layer processing on the cell arriving from
A traffic observation process in P units and a cell exchange process in VP units are performed and returned to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell and sends the cell to the subscriber side processing unit 4a. The subscriber side processing unit 4a first performs physical layer processing on the cell arriving from the cell switching processing unit 5a in the physical layer processing unit, and then performs VP-OAM processing and VP processing in the VP layer processing unit. Performs unit-based traffic observation processing and returns to the physical layer processing unit. The physical layer processing unit performs physical layer processing on the returned cell, and performs a UNI
To send to.

In the VP / VC handling ATM device 1a according to the second embodiment, the subscriber line processing unit 4
a and the relay-side processing unit 6a each have a VP-based shaping processing function, and the relay-side processing unit 6a also has a cell priority control processing function and a cell charging counter processing function. As shown in FIG. 3, a configuration without these functions may be adopted.

FIG. 3 is a block diagram showing a third embodiment of the configuration according to the present invention of the VP / VC handling ATM device of the present invention. VP / VC handling ATM of this example
In the device 1b, the VP of the second embodiment shown in FIG.
/ VC handling ATM device 1a is configured such that a cell priority control processing function, a VP-based shaping processing function, and a cell charging counter processing function are removed. With this configuration, the subscriber-side processing unit 4b and the relay-side processing unit 6b do not perform the VP-based shaping processing in the description related to FIG. 2, and the relay-side processing unit 6b further performs the cell priority control. The above-described cell processing is performed without performing the processing and the cell charging counter processing.

As described above with reference to FIGS. 1 to 3, the VP / VC handling ATM devices 1 to
In 1b, the VC layer processing function conventionally distributed in the line processing unit and the cell switching processing unit of the transmission system processing unit is configured as one independent circuit in the relay side processing units 6 to 6b. . With such a configuration, only the relay processing units 6 to 6b are exchanged, and the VP /
The VC handling ATM devices 1 to 1b can easily be VP handling ATM devices. The present invention is not limited to the embodiment described with reference to FIGS. 1 to 3 and can be variously modified without departing from the gist thereof.

[0028]

According to the present invention, a VP / VC having both a VP handling function and a VC handling function is provided.
The subscriber side processing unit and the cell exchange processing unit of the handling ATM device can be shared with the VP handling ATM device having only the VP handling function without the overhead of the VC handling function, and the VP of the VP / VC handling ATM device can be shared. Diversion to a handling ATM device or diversion from a VP handling ATM device can be easily performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first configuration of an ATM device according to the present invention.
FIG. 3 is a block diagram showing an embodiment.

FIG. 2 is a diagram showing a second configuration of the ATM device according to the present invention;
FIG. 3 is a block diagram showing an embodiment.

FIG. 3 is a diagram showing a third configuration of the ATM device according to the present invention;
FIG. 3 is a block diagram showing an embodiment.

FIG. 4 is an explanatory diagram showing an example of a protocol stack in a conventional ATM network.

FIG. 5 is a block diagram illustrating a configuration example of a conventional ATM device.

[Explanation of symbols]

1-1b: VP / VC handling ATM device, 2-2
b: transmission system processing unit, 3 to 3b: control system processing unit, 4 to 4
b: subscriber side processing unit, 5-5b: cell exchange processing unit, 6-
6b: relay side processing unit, 7-7b: subscriber line, 8-8
b: trunk line, 10: terminal, 11: VP / VC handling ATM device, 31, 32: terminal, 33, 34: VP
/ VC handling ATM device, 35: VP handling ATM device, 36: subscriber line, 37: trunk line, 4
0: control system processing unit, 41: transmission system processing unit, 42: subscriber side processing unit, 43: relay side processing unit, 44: cell switching processing unit.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiromi Ueda Nippon Telegraph and Telephone Corporation, 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo

Claims (3)

[Claims] 1. A VP / VC handling AT which constitutes an ATM network and performs cell processing for both a VP layer and a VC layer.
An M apparatus, which is a subscriber side processing unit that accommodates a subscriber line and performs cell processing of the VP layer, and a relay that accommodates a relay line and performs cell processing of the VP layer and cell processing of the VC layer. Side processing means, and at least cell exchange processing means for performing cell exchange processing on a VP basis between the relay processing means and the subscriber processing means, wherein the relay processing means comprises the subscriber processing means And a VP provided in a circuit independent of the cell exchange processing means.
/ VC handling ATM equipment. 2. The VP / VC handling ATM device according to claim 1, wherein said subscriber side processing means comprises:
Means for performing level OAM processing, means for performing VP-UPC processing, means for performing traffic observation processing in VP units, and means for performing VPI conversion processing. And a means for performing cell exchange processing in units of VPs. The relay processing means includes means for performing VP-level and VC-level OAM processing, and means for performing VC-UP
A VP / VC handling ATM device comprising at least means for performing C processing, means for performing traffic observation processing in VC units, and means for performing VPI and VCI conversion processing. 3. The VP / VC handling ATM device according to claim 2, wherein said subscriber side processing means comprises a VP / VC handling unit.
At least means for performing a shaping process in units,
The VP / VC handling ATM device, wherein the relay side processing means has at least a means for performing a cell priority control processing, a means for performing a shaping processing in VP units, and a means for performing a cell charging counter processing.