JP3523427B2 - Data exchange device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a line accommodating unit connected to a plurality of terminals, and a line processing unit for performing call control of terminal lines and the like and data transfer control between other data exchange devices. The present invention relates to a data exchange device.

In recent years, a plurality of lines of data on the terminal side are grouped for every several lines, and a line conversion unit provided with a frame conversion unit having a common buffer therein and for communicating with a plurality of line processing units, With other data exchange equipment (relay equipment),
In order to transmit and receive data, a line processing unit having means for converting the data into suitable data is provided, and congestion control means for preventing data discard due to occurrence of congestion between the line accommodation unit and the line processing unit is provided. The data exchange equipment I have is being used.

[0003]

2. Description of the Related Art FIGS. 15 and 16 are configuration diagrams (line accommodation unit side) and (line processing unit side) of a conventional example of a data exchange apparatus.

The conventional data exchange apparatus 1 shown in FIGS. 15 and 16 mainly includes a line accommodating unit 10 (FIG. 15) connected to a plurality of terminals 3 (# 0 to #n) and lines of the terminals 3. Etc. and a line processing unit 20 (FIG. 16) for performing data transfer control with another data exchange device 4, and a large number of lines (terminals, etc.) are exchanged by frame relay exchange, packet exchange, etc. Perform data communication.

Further, a and b are terminals 3 and a data exchange device 1.
Is a line (a is an up line, b is a down line), and c to e are lines of the line accommodation unit 10 and the line processing unit 20 (c is an up line, d is an individual line for congestion notification, and e is a down line). Yes, f and g are lines (f is an up line and g is a down line) between the data exchange device and the other data exchange device 4.

The data exchange device has other functional blocks for device management, which are not shown. Further, in the line accommodation unit 10, it is possible to control a plurality of line processing units 20 and connect to the plurality of line processing units 20, but in order to simplify the explanation, in FIG. 15 and FIG. 10 and the line processing unit 20 are connected one to one.

The line accommodating unit 10 accommodates lines on the terminal side, collects several lines, and performs frame-multiplexed communication with a plurality of predetermined line processing units 20. It is provided with a data transmission / reception means for transmitting / receiving data for each section side, a transmission / reception buffer, and means for replenishing or releasing the control of data transfer and a buffer from an internal common resource (common buffer) at that time.

The line processing unit 20 performs call control of a terminal line or the like connected to the line accommodation unit 10, converts data from the line accommodation unit into a data format suitable for another data exchange device, or A process for converting data from the data exchange device into a data format suitable for the line accommodation unit 10 is executed by providing a data transfer control unit and a buffer for each line.

A transmission / reception operation between the terminal, the line accommodating unit, the line processing unit and the other data switching device in FIGS. 15 and 16 will be described. Transmission from terminal to line processing unit In FIG. 15, the line accommodating unit 10 communicates with the terminal 3 by packetized data on the terminal side lines a and b.
The terminal-side data receiving unit 1 receives data from the terminal-side line a under the control of the terminal-side data reception control unit 105.
00, and the corresponding terminal side reception buffer 101
(One of # 0 to #n). Next, under the control of the line processing side data transmission control unit 106, each data in the terminal side reception buffer 101 is multiplexed by the frame multiplexing unit 102 in order to frame multiplex the data on the line processing unit side line c determined in advance. It is stored in the transmission buffer 103 on the line processing side. Actually, the terminal side data reception control unit 105
Thus, the corresponding terminal-side reception buffer 101, which has been received and accumulated in each terminal-side reception buffer 101, is connected as a line processing side transmission buffer 103 for frame multiplexing. At this time, the terminal side data reception control unit 105
The corresponding data buffer of the terminal side reception buffer 101 is connected to the line processing side transmission buffer 103, and the reduced amount of data buffer is replenished from the common buffer 107 to the terminal side reception buffer 101.

Thereafter, the line processing side data transmission control unit 10
Under the control of 6, the data is transmitted to the line processing unit 20 via the line processing side data transmission unit 104 to the line c. At this time, when the line processing side data transmission control unit 106 recognizes that data is transmitted from the line processing side transmission buffer 103 to the line processing unit 20 via the line processing side data transmission unit 104, only that much data is transmitted. The data buffer is released and returned to the common buffer 107. By this operation, the line accommodation unit 10 multiplexes the data received from a plurality of terminals, and the data is transmitted to the corresponding line processing unit 20 by frame multiplexing.

The transmission line accommodating unit 10 from the line processing unit to the terminal receives the line processing side data from the line processing unit 20 by the control of the line processing side data reception control unit 109 by the frame multiplexed data for a plurality of terminals. Receiver 1
Accumulated in the line processing side reception buffer 113 via 12,
The reception data is separated via the frame separation unit 114 by the operation reverse to that at the time of frame multiplexing. At this time, by separating the received data buffer in the data buffers constituting the line processing side reception buffer 113 to the terminal side transmission buffer 115, the frames are separated, and the line processing side data reception control unit 109 , Line processing side receive buffer 11
When 3 is connected to the terminal side transmission buffer 115 by frame separation, the data buffer corresponding to the reduced amount is replenished from the common buffer 107 to the line processing side reception buffer.

Then, under the control of the terminal side data transmission control section 108, data is transmitted to the terminal via the terminal side data transmission section 116. At this time, when the terminal side data transmission control unit 108 recognizes that the data transmission from the terminal side transmission buffer 115 to the terminal is completed via the terminal side data transmission unit 116, the data buffer for that amount is released and the common buffer is opened. Return to buffer 107. By this operation, the line accommodation unit 10 distributes the frame-multiplexed data from the line processing unit 20 to the corresponding terminal 3 and sends it out.

In addition, as a preparation for transmitting and receiving data between the terminal 3 and the line processing unit 20, the line accommodation unit 10
Then, under the control of the terminal side data reception control section 105 and the line processing side data receiving section 112, a fixed number of data buffers are allocated in advance from the common buffer 107 as the terminal side receiving buffer 101 and the line processing side receiving buffer 113, respectively. .

In the line processing unit 20 and the transmission / reception line processing unit 20 of the other data exchange device 4, the line housing side data receiving unit 200 controls the data sent from the line housing unit 10 by the line housing side data reception control unit 204. Is stored in the line accommodation side reception buffer 201 through the data format conversion unit 202
Is converted into a data format suitable for the relay side, and the data is sent to another data exchange device 4 via the other device side transmission unit 203.

Further, the data received from the other data exchange device 4 is passed through the other device side receiving section 209,
The data format restoration unit 210 restores the data format suitable for the line accommodation unit 10, and the line accommodation side transmission buffer 211
Accumulate in. After that, the line transmission side data transmission control unit 20
Under the control of 8, data transmission is performed to the line accommodation unit 10 via the line accommodation side data transmission unit 212.

In the conventional structure as shown in FIG.
When the concentration of data on a specific terminal or the concentration of data on a specific terminal group (terminal group of one line accommodation unit 10) occurs, the common buffer 107 continues to decrease,
There is a problem that the line accommodating unit 10 as a whole cannot be processed.

For this reason, conventionally, the line processing unit 10 is provided with a congestion state detecting unit 117, and the data buffer length and the like accumulated in the terminal side transmission buffer 115 and the line processing side reception buffer 113 are monitored to perform the line processing. A data transfer state (congestion occurrence, release state) in the terminal direction is detected from the unit 20, and when this state is detected, the dedicated frame congestion notification information creating unit 110 creates a dedicated frame, and the frame multiplexing unit 102 normal data. The signal is multiplexed (frame-multiplexed) on the signal line and sent to the line processing unit, or the individual line congestion notification information creating unit 111 is driven and the line processing unit 2 is transmitted via the individual line d.
Either one of 0 and 0 was used.

In the line processing unit, either the dedicated frame congestion notification information identifying unit 205 extracts the congestion notification of the dedicated frame or the individual line congestion notification information identifying unit 206 receives the congestion notification from the individual line d. Accordingly, when the congestion information is notified to the data transmission stop / restart instruction unit 207, the line accommodation side data transmission control unit 208 stops the corresponding data transmission in the line accommodation side transmission buffer 211.
Also, the transmission restart was controlled.

[0019]

The above-mentioned conventional techniques have the following problems. When congestion occurs in the transmission buffer on the terminal line side in the line accommodation unit and congestion control (stopping data transmission to the applicable terminal line) on the line processing unit side cannot be performed satisfactorily due to a failure, etc., inside the line accommodation unit Common buffer is excessively used by the concerned line during congestion, and adversely affects other normal terminal lines (in the worst case, data discarding occurs in the entire line accommodating unit due to the lack of common buffer) was there. This phenomenon was especially problematic because the line accommodating unit can be connected to multiple line processing units simultaneously.

Further, in order to effectively use the buffer resources in the line accommodating unit and the line processing unit, even when the congestion detection threshold in the line accommodating unit is set to the limit, similar congestion may occur due to a sudden change in the data transfer traffic. Connection may not be performed well, which is a serious problem.

Similarly to the above, when the congestion connection is not properly established between the line accommodation and the line processing unit, the line processing unit that manages the terminal side management information (billing etc.) operates normally. However, there is a problem that data may be discarded in the line accommodating unit despite the fact that the data is not received at the other terminal, but the user may be charged. It was

When a dedicated frame is created as information (congestion information, etc.) to be notified from the line accommodating unit to the line processing unit and transferred using a normal data signal line, if the notification frequency increases, There is a problem that the overhead as a frame increases and the normal data transfer capacity decreases.

The present invention solves the above problems, effectively utilizes resources such as an internal common buffer, data transfer capacity, etc., effectively utilizes information due to data discarding, etc., and has high reliability with reduced frame overhead. An object is to provide a data exchange device.

[0024]

FIG. 1 is a block diagram of the first principle of the present invention, FIG. 2 is a block diagram of the second principle of the present invention, and FIG. 3 is a block diagram of the third principle of the present invention. FIG. 4 is a fourth principle configuration diagram of the present invention.

1 to 4, 1, 10, 20,
Similar to the reference numerals of the above-mentioned conventional example (FIGS. 15 and 16), 3 is a data exchange device, 10 is a line accommodation unit, 20 is a line processing unit, and 3 is a terminal. The main components related to the principle are mainly shown, and the same parts as the conventional ones are omitted from the drawing.

In FIG. 1 showing the first principle configuration of the present invention, 117 is a congestion state detecting unit similar to the conventional one, 118 is a transmission buffer length detecting means during congestion state, and 119 is corresponding transmission data forced stop instruction means. The other parts of the line accommodating unit 10 and the line processing unit 20 are the same as those in the related art (FIGS. 15 and 16).

In the first principle configuration, the line accommodation unit 1 of FIG.
In the congestion state detection unit 117 in 0, the terminal side transmission buffer 115 and the line processing side reception buffer 1 as in the conventional case.
When the state of 13 is monitored and the congestion state is detected, the congestion information is notified to the line processing unit 20 from the dedicated frame congestion notification information creating unit 110 or the individual line congestion notification information creating unit 111 as in the conventional case. At this time, the congestion state transmission buffer length detecting means 118 is driven by the congestion state detecting unit 117 to perform detection. At this time, if the congestion control is not properly performed on the line processing unit 20 side and the transmission data from the line processing unit 20 does not stop, the transmission buffer length detecting means 118 during the congestion state
Detects that the data buffer length (stored data length) of each terminal side transmission buffer 115 exceeds a preset threshold value, and drives the corresponding transmission data forced stop instruction means 119. As a result, the transmission data of the terminal side transmission buffer 115 having a data buffer length exceeding the threshold value is discarded and the data buffer is returned to the common buffer 107.

In FIG. 2 showing the second principle configuration of the present invention, reference numeral 120 in the line accommodating section 10 is reception data discard detecting means, 121 is dedicated frame data discard information notifying means, and 213 in the line processing section 20. Is a dedicated frame data discard information identifying means, and 214 is a data discard information accumulating means.

According to the second principle, as in the case of FIG. 1, the same congestion state detection unit 117 as in the conventional case is used, and the terminal side transmission buffer 1
15, the state of the line processing side reception buffer 113 is monitored, and when the congestion state is detected, the congestion information is transmitted from the dedicated frame congestion notification information creating unit 110 or the individual line congestion notification information creating unit 111 as in the conventional case. 20 is notified, but when a state in which the congestion control in the line processing unit 20 is not satisfactorily performed due to a failure or the like and the buffer data capacity in the line processing side reception buffer 113 is almost exhausted (free capacity is below a certain value) is detected. The received data discard detecting means 120 detects this, the dedicated frame data discard information notifying means 121 creates discard information, and sends it to the line processing section 20 by frame multiplexing. In the line processing section 20, the dedicated frame data discard information identifying means 213 identifies this and stores the discard information in the data discard information storing means 214,
Used for billing processing.

In FIG. 3 showing the third principle configuration of the present invention, 122 in the line accommodating section 10 is individual line data discard information notifying means, and 215 in the line processing section 20 is individual line data discard information identifying means. The other configuration is shown in FIG.
Is the same as.

In the third principle configuration of the present invention, the congestion control in the line processing unit 20 is not satisfactorily performed as in the case of FIG. 2, and the capacity of the buffer data in the line processing side reception buffer 113 is almost exhausted (vacant). When the capacity is detected to be a certain value or less), the received data discard detecting means 120 detects it. According to the third principle, this discard information is supplied to the individual line data discard information notifying means 122 and sent to the line processing unit 20 via the individual line for communication of the discard information. In the line processing unit 20, when the individual line data discarding information identifying means 215 receives and identifies this, the discarding information is stored in the data discarding information storing means 214 and used for billing processing and the like.

In FIG. 4 showing the fourth principle configuration of the present invention, 123 in the line accommodating section 10 is provided after the frame multiplexing processing section 102 and is generated from the received data discard detecting means 120 and the congestion state detecting section 117. Various information normal data sharing means for sharing (adding) the discard information and the congestion information to the normal data (data from the terminal) from the frame multiplexing processing unit 102, and 216 in the line processing unit 20 is sent from the line accommodation unit 10. Various information normal data separating means for separating the discard information and the congestion information from the received signal. In this configuration, the congestion information from the congestion state detection unit 117 is not supplied to the frame multiplexing processing unit 102 as in the conventional case, and the dedicated frame congestion notification information creation unit in the conventional line accommodation unit (FIG. 15) is used. 110 and the dedicated frame congestion notification information identifying unit 205 in the line processing unit 20 are unnecessary.

In the fourth principle configuration of the present invention, when the congestion state detection unit 117 detects congestion, the congestion state detection unit 1
The congestion notification generated from 17 is jointed (multiplexed) with the normal data by the various information normal data jointing means 123, separated by the various information normal data separating means 216 of the line processing unit 20, and the data transmission stop / restart instruction is issued in the same manner as in the conventional case. The unit 207 is driven to control the stop of transmission from the line processing unit 20 to the line accommodation unit 10. If this control is not performed normally,
The capacity of the line processing side reception buffer 113 of the line accommodating unit 10 is almost exhausted (the free capacity is below a certain value). When this state is detected by the reception data discard detecting means 120, this discard information is used as various information normal data sharing means 1
23, and is sent from there to the line processing unit 20. The various information normal data separating means 216 of the line processing unit 20 separates this signal, and the discard information is accumulated in the data discard information accumulating means 214 for billing. Used for processing etc.

Further, the first principle described above may be combined with the second to fourth principles, the second principle may be combined with the third or fourth principle, or any other combination. .

[0035]

FIG. 5 is a block diagram of the first embodiment.
The first embodiment corresponds to the first principle configuration of the present invention shown in FIG. 1, and only the configuration of the line accommodation unit 10 is shown, and the configuration of the line processing unit 20 is the same as the conventional one, so that it is omitted from the drawing. .

In FIG. 5, reference numeral 1 in the line accommodation unit 10
Each part represented by 00 to 117 corresponds to each part of the conventional line accommodating part 10 shown in FIG. However, the frame multiplexing processing unit 102, the terminal side data reception control processing unit 105, the line processing side data transmission control processing unit 106, the terminal side data transmission control processing unit 108, the line processing side data reception control processing unit 109 of FIG. Frame distribution processing unit 114,
The congestion state detection processing unit 117 is a function executed by the processor in the line accommodating unit 10 and has a different name from that of FIG. 15 (a processing unit is added). The description is omitted because it is the same. Also,
Reference numeral 1180 denotes a data discard buffer length detection processing unit (corresponding to 118 in FIG. 1), and 1190 a corresponding transmission data forced discard processing unit (corresponding to 119 in FIG. 1).

In this configuration, the terminal side transmission buffer 1
When congestion occurs at 15, either the dedicated frame congestion notification information creation processing unit 110 or the individual line congestion notification information creation unit 111 operates and the line accommodation unit 10 changes to the line processing unit 20.
A case will be described in which a data congestion state is notified to a specific terminal using a dedicated frame or an individual line (not shown).

The line accommodation unit 10 or the line processing unit 2 is assumed.
If the transmission of data from the line processing unit 20 to the corresponding terminal line does not stop due to a partial failure of 0, etc., within the processing capacity of the processor in the line accommodation unit 10, the corresponding terminal from the line processing side reception buffer 113 Since the connection to the side transmission buffer 115 is changed, in the worst case, the number of common buffers 107 is reduced, so that buffers for other lines become insufficient, resulting in data discard.

Therefore, when the terminal side transmission buffer 115 is congested, after the line processing side reception buffer 113 is connected to the corresponding terminal side transmission buffer 115 by the frame distribution processing unit 114, the data discarding is triggered by the connection. When the hour buffer length detection processing unit 1180 refers to the connected data buffer length and detects that it has become equal to or greater than the preset threshold value A, the corresponding transmission data forced discard processing unit 1190 is driven. As a result, the corresponding transmission data forced discard processing unit 1190 performs transmission data discard processing on the terminal side data transmission control processing unit 108. As a result, the terminal data transmission control processing unit 108 discards the transmission data lastly connected to the corresponding terminal side transmission buffer 115, releases the data buffer, and returns it to the common buffer 107 (in the opened state). Take action.

During this period, the terminal side data transmission section 116 is also provided.
Is controlled by the terminal side data transmission control processing unit 108.
The transmission data connected to the terminal side transmission buffer 115 is sequentially transmitted to the terminal.

Therefore, the data discard buffer length detection processing unit 1180 and the corresponding transmission data forced discard processing unit 1190
Is less than or equal to a preset threshold value B (A ≧
By repeating until B), it is possible to prevent the common buffer 107 from being consumed more than necessary by a line that performs an abnormal operation due to a failure, and to prevent adverse effects on other normal lines.

FIG. 6 shows an example of the hardware configuration of the congestion state detection and data discard state detection, and FIG. 7 shows the processing flow of the congestion state detection processing unit and the data discard buffer length detection processing unit.

In FIG. 6, 30 is a transmission data address pointer memory, 31 is transmission data, 32 is a transmission data head address counter, 33 is a transmission data next connection address counter, and 34 is a count control flip-flop for the transmission data next connection address counter. Is.

At the address BBB on the transmission data address pointer memory 30 designated by the transmission data next connection address counter 33, the address YYY indicating the transmission data 31 is displayed.
Is written and the address X written in the address AAA indicated by the transmission data start address counter 32 is written.
The transmission data 31 indicated by XX is read and transmitted.
If the number of data waiting to be sent in the send buffer is n,
It is obtained by the calculation of n = BBB-AAA.

Letting L be the threshold value for monitoring the occurrence state of the congestion state, it is discriminated that the congestion state has occurred by detecting that n ≧ L. In addition, the monitoring threshold of the data discard state is M
When (M> L), when it is detected that n> M, the data discard state is identified. When this data discard state is identified, an inhibit input is supplied to the reset terminal (indicated by R) of the count control flip-flop 34 to reset it, and its output terminal (indicated by Q) becomes low (low level), Enable terminal of the send data next connection address counter 33 to which this output is supplied (indicated by EN)
Is no longer driven, and the count cannot be updated.
Further, since the writing of the address of the transmission data 31 to the transmission data address pointer memory 30 is also inhibited, the data is not actually connected as a transmission buffer and is discarded.

In the processing flow shown in FIG. 7, the congestion state detection processing unit (corresponding to 117 in FIG. 5) is first performed to identify whether the flag indicating whether or not the congestion state is on (FIG. 7). S1), if it is not on, it is identified whether or not congestion has occurred (same S
2). This identification is made based on whether or not n ≧ L described with reference to FIG. 6 is satisfied. If congestion has occurred, the flag in the congestion state is turned on (S3 in FIG. 7). When the congestion state flag is on, the process of the data discard buffer length detection processing unit (1180 in FIG. 5) is executed (at step S4).

In the buffer length detection processing unit at the time of data discard,
It is determined whether or not the data discarding state flag is on (S40 in FIG. 7). When the flag is on, operations such as monitoring that the discarding state disappears are performed when it is on, and when it is off, data discarding is performed. It is determined whether it has occurred (S41 in FIG. 7). This determination is made based on whether or not n ≧ M is satisfied as described with reference to FIG. When it is identified that the data has been discarded, the transmission data next connection address counter (3 in FIG.
3) is prohibited and forced data discard is performed (Fig. 7).
S42), the data discarding state flag is turned on (S43).

FIG. 8 and FIG. 9 show the configuration (line accommodation unit side) and (line processing unit side) of the data exchange apparatus according to the second embodiment. The second embodiment corresponds to the second principle configuration of the present invention. To do. In the second embodiment, discard information of frame data is frame-multiplexed and transmitted.

In the line accommodation unit 10 of FIG.
Each part represented by 0 to 117 corresponds to each part of the line accommodating part 10 of the first embodiment (FIG. 5) having the same reference numeral, and a description thereof will be omitted. Reference numeral 1200 is a received data discard detection processing unit (1 in FIG. 2 above).
20) and 1210 are dedicated frame data discard information creation processing units (corresponding to 121 in FIG. 2). In addition,
Since it is clear that discarding does not occur in the terminal side transmission buffer 115 in principle (only by connecting the transmission data), the transmission buffer discarding is performed in the second embodiment (the same applies to the third and fourth embodiments). No detection process is performed. However, in the case of the configuration combined with the first embodiment, the transmission data is forcibly discarded, so that the transmission data discard detection process is performed.

Further, in the line processing unit 20 of FIG. 9, the respective units denoted by reference numerals 200 to 212 correspond to the respective units having the same reference numerals of the above-described conventional line processing unit 20 (FIG. 16), and a description thereof will be omitted. However, the line accommodation side data reception control processing unit 204, the dedicated frame congestion notification information identification processing unit 205, the individual line congestion notification information identification unit 206, the data transmission stop / restart instruction processing unit 207, and the line accommodation side data transmission control processing unit 208. Each unit represents a function executed by the processor in the line processing unit 20, and a part of the name is different from each symbol in FIG. 16 (a processing unit is added), but like each other symbol. Since it corresponds to each part of the conventional example, the description thereof is omitted.
Further, 2130 in FIG. 9 is a dedicated frame data discard information identification processing unit (corresponding to 213 in FIG. 2), 2140 and 214.
Reference numeral 1 denotes a data discard information storage processing unit and a storage memory, respectively (2140 and 2141 are combined and correspond to 214 in FIG. 2).

In the second embodiment, the received data discarding detection processing section 1200 refers to the free capacity of the line processing side reception buffer 113 at a certain fixed period, and the free capacity is almost exhausted (less than or equal to the designated threshold value C). When it detects that
Since there is a possibility of data discard, the information (terminal line number, etc.) of the last received data is passed to the dedicated frame data discard information creation processing unit 1210 to create a dedicated frame for data discard communication. Give instructions. The dedicated frame data discard information creation processing unit 1210 creates a dedicated frame for data discard notification from the relevant information. The format of the dedicated frame is the same as for normal data,
Flag (represents the beginning of a frame), data (including discard information and identification information for identifying a dedicated frame), FC
S (frame check sequence) and flag (representing the end of the frame). This dedicated frame is input to the frame multiplexing processing unit 102, where it is frame-multiplexed with normal data and sent to the line processing unit 20.

On the other hand, in the line processing unit 20, the line accommodation unit 10
The data from the above is monitored, and if it is a dedicated frame, the dedicated frame data discard information identification processing unit 2130 operates,
Recognizing that data discarding has occurred in the line accommodation unit 10,
The notification information at that time is stored in the data discard information storage processing unit 2140.
And the data discard information storage processing unit 2140 stores the discard information in the storage memory 2141. Also,
Based on the identification output of the dedicated frame data discard information identification processing unit 2130, it is possible to activate various management processes (for example, billing function) performed by the line processing unit 20.

FIGS. 10 and 11 show the configuration (line accommodation unit side) and (line processing unit side) of the data exchange apparatus of the third embodiment.
The third embodiment corresponds to the third principle configuration of the present invention. In the third embodiment, instead of frame-multiplexing the discard information of the frame data on the data signal line as in the second embodiment, an individual line which is a control line provided between the information processing unit 20 and the individual line processing unit 20 is used. To notify you.

In the line accommodation unit 10 of FIG.
The parts denoted by 00 to 117 correspond to the parts having the same reference numerals as those in FIG. Further, reference numeral 1200 is the above-mentioned FIG.
Similarly to the received data discarding detection processing unit, 1220 is an individual line data discarding notification information creation processing unit (12 in FIG. 3 above).
(Corresponding to 2).

Further, in the line processing unit 20 of FIG.
Each part represented by reference numerals 200 to 212 corresponds to each part having the same reference numeral in FIG. 2140 and 2 in FIG.
141 is similar to FIG. 9 (line processing unit of the second embodiment),
They represent the data discard information storage processing unit and the storage memory, respectively.

In the third embodiment, when the reception data discarding detection processing unit 1200 detects data discarding in the line processing side reception buffer 113 (a state in which the threshold value is equal to or less than the designated threshold C), individual line data discarding notification information creation processing Part 122
Data discard notification information is created with 0 and sent to the individual line for this data discard notification information. When the line processing unit 20 receives and identifies this by the individual line data discard notification information identification processing unit 2150, it is supplied to the data discard information storage processing unit 2140 as in the second embodiment (FIG. 9), and the storage memory 2
Processing such as accumulation in 141 is performed.

In the third embodiment, as compared with the second embodiment, the configuration and processing for conversion to the dedicated frame and restoration from the dedicated frame are not necessary, and the information notification time is shortened. 12 and 13 show the configuration (line accommodation unit side) and (line processing unit side) of the data exchange apparatus of the fourth embodiment, and this fourth embodiment corresponds to the fourth principle configuration of the present invention. In the fourth embodiment, the discard information of the frame data is added to the normal data and transmitted without using the data signal line for frame multiplexing or the individual line unlike the second and third embodiments.

In the line accommodation unit 10 of FIG.
Each part represented by 00 to 117 corresponds to each part having the same reference numeral as in FIGS. 8 and 10, and a description thereof will be omitted. Further, reference numeral 1200 is a received data discarding detection processing unit as in FIGS. 8 and 10, and 1240 is a normal data internal type information addition processing unit (corresponding to 124 in FIG. 4).

Further, in the line processing unit 20 of FIG.
Each part represented by reference numerals 200 to 212 corresponds to each part having the same reference numeral in FIG. 9 and FIG. 2140 of FIG.
Similarly to FIGS. 9 and 11 (the line processing unit of the second embodiment), 2141 represent a data discard information storage processing unit and a storage memory, respectively, and 2160 is a normal data various information descending processing unit. The various information descending processing unit 2160 in the normal data will be described later with reference to FIG.

In the case of the fourth embodiment, when a congestion state or a data discard state occurs in the line accommodation unit, the congestion state detection processing unit 117 or the received data discard detection processing unit 120.
Corresponding congestion information or discard information is generated from 0 and is supplied to the various information addition processing unit 1240 in normal data. The frame-multiplexed signal subjected to the additional processing is multiplexed by the frame multiplexing processing unit 102, sent to the line processing unit 20 via the line processing side transmission buffer 103 and the line processing side data transmission unit 104, and the line is accommodated. It is supplied to the various information distribution processing unit 2160 in normal data via the side data receiving unit 200 and the line accommodation side receiving buffer 201. Here, the various information addition processing unit 124 in the normal data of the line accommodation unit 10
The congestion information or the data discard information added with 0 is distributed, and the congestion information is sent to the data transmission stop / restart instruction processing unit 2
07, the data discard information is supplied to the data discard information storage processing unit 2140, and a process of storing it in the storage memory 2141 is performed.

FIG. 14 is an explanatory diagram of processing in the various information addition processing unit in normal data. In FIG. 14, reference numeral 40 is a buffer memory (corresponding to the terminal side reception buffer 101 in FIG. 12), 41 is a reception address counter, and 42 is a transmission address counter.

The operation in FIG. 14 will be described in order of. When accumulating the received data from the terminal side in the buffer memory 40, an area 40a (determined by an offset value) to which various kinds of information can be added in advance is previously set in the buffer memory 40 (controlled by an offset counter). The reception data is stored by designating the area after the empty area by the reception address counter.

After this, if congestion information or received data discard information has occurred, this area is written as additional information. The data stored in the buffer memory 40 is read by the transmission address counter 42 from the beginning of the buffer memory 40. At this time, an additional information presence / absence identifier (1 bit) is set at the beginning of the transmission data, and “0” or “1” is set depending on whether additional information is stored in the empty area for reading. If it is set and "0" is set, the content of the additional information is "don't c
If "are" is added and "1" is set, the additional information is read out, and then the received data is transmitted in the following format.

In the example of FIG. 14, the additional information is added before the received data, but it is also possible to add the additional information after the received data. In that case, it is not necessary to add extra data (don't care) when there is no additional information.

In the case of the fourth embodiment, the frame is not used for the information notification as compared with the case where the dedicated frame is used for multiplexing in the second embodiment, and therefore, the transfer capacity of the normal data is not much affected. Also, the complexity of using the individual line for notification as in the third embodiment can be eliminated.

Although the configurations of the first to fourth embodiments have been described above, the configuration of the first embodiment is combined with other embodiments to the fourth to fourth embodiments to detect the discard of the transmission buffer for each terminal, and thereby the corresponding transmission buffer. It is clear that the transmission from the terminal to the terminal can be forcibly stopped, and at the same time, the detection of the discard of the receiving buffer on the line accommodating side can be notified to the line processing unit. The operation of can be guaranteed and the reliability when a problem occurs can be improved.

Further, the line accommodating section 10 of the data exchange device,
The processing of each unit of the line processing unit 20 can be realized by processor processing, but it is obvious that this can be realized by hardware logic.

[0068]

According to the present invention, the following effects can be obtained. Due to a partial failure of the line accommodation unit or line processing unit,
When congestion of the transmission buffer on the terminal line side in the line accommodation unit cannot be controlled normally, the transmission data to the corresponding line is forcibly discarded in the line accommodation unit, and internal common resources (buffer etc.) are exceeded It can be prevented from being used and can be prevented from adversely affecting other normal terminal lines.

When data is discarded in the line accommodation unit, the line processing unit is notified so that the line processing unit can perform highly reliable device management such as not charging the line.

By constructing a structure in which various information transferred (notified) from the line accommodating unit to the line processing unit is added to each terminal data as additional information, a dedicated frame is not used and the overhead is reduced as a frame. The data transfer capacity can be expected to improve.

[Brief description of drawings]

FIG. 1 is a diagram showing a first principle configuration of the present invention.

FIG. 2 is a diagram showing a second principle configuration of the present invention.

FIG. 3 is a diagram showing a third principle configuration of the present invention.

FIG. 4 is a diagram showing a fourth principle configuration of the present invention.

FIG. 5 is a configuration diagram of a data exchange device according to the first embodiment.

FIG. 6 is a diagram illustrating a hardware configuration example of congestion state detection and data discard state detection.

FIG. 7 is a diagram showing a processing flow of a congestion state detection processing unit and a data discarding buffer length detection processing unit.

FIG. 8 is a diagram showing a configuration (line accommodating unit side) of a data exchange device according to a second embodiment.

FIG. 9 is a diagram showing a configuration (line processing unit side) of a data exchange device according to a second embodiment.

FIG. 10 is a diagram showing a configuration (line accommodation unit side) of a data exchange device according to a third embodiment.

FIG. 11 is a diagram showing a configuration (line processing unit side) of a data exchange device according to a third embodiment.

FIG. 12 is a diagram showing a configuration (line accommodating unit side) of a data exchange device according to a fourth embodiment.

FIG. 13 is a diagram showing a configuration (line processing unit side) of a data exchange device according to a fourth embodiment.

FIG. 14 is an explanatory diagram of processing in various information addition processing unit in normal data.

FIG. 15 is a configuration diagram (line accommodation unit side) of a conventional example.

FIG. 16 is a configuration diagram (line processing unit side) of a conventional example.

[Explanation of symbols]

1 Data exchange device 10 line accommodation 20 line processor 3 terminals 117 Congestion state detection unit 118 Transmission Buffer Length Detecting Means During Congestion State 119 Corresponding transmission data forced stop instruction means

Front Page Continuation (72) Inventor Shin Abe, Shinjuku-ku, Tokyo, 3-19-3 Nishishinjuku, Nihon Telegraph and Telephone Corporation (72) Inventor, Hiroshi Tsuchiya 3-2-1, Nishishinjuku, Shinjuku-ku, Tokyo (56) References JP-A-8-56238 (JP, A) JP-A-6-132977 (JP, A) JP-A-8-186571 (JP, A) JP-A-7-46250 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/56 H04L 13/08

Claims (4)

(57) [Claims] 1. A line accommodating section for accommodating a plurality of terminal side lines to transmit and receive data, and a line for accommodating call control of a terminal line or the like accommodated in the line accommodating section and connecting to another data exchange device are accommodated. A line processing unit for transmitting and receiving data to and from the line accommodation unit, and means for notifying a corresponding line processing unit of congestion occurrence / cancellation of a buffer that stores transmission data from the line accommodation unit to the terminal side, In a data exchange device having means for controlling stop / restart of data transfer to the line accommodation unit in the line processing unit according to a notification from the line accommodation unit, for transmitting data to the terminal side to the line accommodation unit Means for detecting that the congestion state of the terminal-side transmission buffer for storing data is detected, and after the congestion information is sent to the line processing unit, detecting that the amount of data in the terminal-side transmission buffer is above a certain level; Serial data exchange device, characterized in that it comprises a means for forcibly stopping the data transmission from the corresponding transmission buffer by the detection output of the detecting means to the terminal. 2. A line accommodating unit for accommodating a plurality of terminal side lines to transmit and receive data, and a line and a line accommodating unit for performing call control of a terminal line accommodated in the line accommodating unit and connecting to another data exchange device. A line processing unit for transmitting and receiving data to and from the communication unit, and means for notifying the corresponding line processing unit of congestion occurrence / release of the buffer storing the transmission data from the line accommodation unit to the terminal side, and the line processing unit In a data exchange device having means for controlling stop / restart of data transfer to the line accommodation unit according to a notification from the line accommodation unit, the line accommodation unit is provided with a reception buffer for storing data from the line processing unit. Means for detecting the occurrence of data discard of
Dedicated frame data discard information notifying means for generating data discard occurrence and various related information as a dedicated frame by the detection output of the data discard detecting means and supplying it to the data signal line is provided, and the line processing unit is provided with the data signal line. A means for identifying and accumulating the notification of the data discard information from the terminal is provided, and the line accommodating unit is provided with a device for transmitting the data to the terminal side.
The congestion status of the terminal-side send buffer that stores the data is detected.
And the congestion information is sent to the line processing unit and then the terminal
Detected that the amount of data in the side transmission buffer is above a certain amount
Means and a corresponding output by the detection output of the detection means.
Forcibly stop data transmission from the communication buffer to the terminal
Data exchange device, characterized in that it comprises a means. 3. A line accommodating unit for accommodating a plurality of terminal side lines to transmit and receive data, and a line and a line accommodating unit for performing call control of a terminal line accommodated in the line accommodating unit and connecting to another data exchange device. A line processing unit for transmitting and receiving data to and from the communication unit, and means for notifying the corresponding line processing unit of congestion occurrence / release of the buffer storing the transmission data from the line accommodation unit to the terminal side, and the line processing unit In a data exchange device having means for controlling stop / restart of data transfer to the line accommodation unit according to a notification from the line accommodation unit, the line accommodation unit is provided with a reception buffer for storing data from the line processing unit. Means for detecting the occurrence of data discard of
A means for creating various information related to the occurrence of data discard and related information by the detection output of the data discard detecting means, and notifying the line control unit to individual control lines is provided, and the line control unit is provided with the individual control lines. Means for identifying and accumulating the data discard information notification from the terminal is provided, and the line accommodating unit is provided with a device for transmitting data to the terminal side.
The congestion status of the terminal-side send buffer that stores the data is detected.
And the congestion information is sent to the line processing unit and then the terminal
Detected that the amount of data in the side transmission buffer is above a certain amount
Means and a corresponding output by the detection output of the detection means.
Forcibly stop data transmission from the communication buffer to the terminal
Data exchange device, characterized in that it comprises a means. 4. A line accommodating unit for accommodating a plurality of terminal side lines to transmit and receive data, and a line and a line accommodating unit for performing call control of a terminal line accommodated in the line accommodating unit and connecting to another data exchange device. A line processing unit that transmits and receives data to and from the communication unit, and a congestion state detection unit that detects congestion occurrence / release of a buffer that stores transmission data from the line accommodation unit to the terminal side; In a data exchange device equipped with means for controlling stop / restart of data transfer to a line accommodation unit by notification of a congestion state from the accommodation unit, in the line accommodation unit, a receiving buffer for storing data from the line processing unit Received data discard detecting means for detecting the occurrence of data discard of the above and generating data discard information, and a normal data receiving means for receiving information from the congestion state detecting part and the data discard detecting means from each terminal. Added to the data provided and joining means for notifying via the data signal line, the line processing unit, and means for separating said congestion status and data discard information from the normal data of the data signal lines,
The data discarding information that has been separated is stored, the control is performed according to the congestion state , and the data for transmitting the data to the terminal side is transmitted to the line accommodation unit.
The congestion status of the terminal-side send buffer that stores the data is detected.
And the congestion information is sent to the line processing unit and then the terminal
Detected that the amount of data in the side transmission buffer is above a certain amount
Means and a corresponding output by the detection output of the detection means.
Forcibly stop data transmission from the communication buffer to the terminal
Data exchange device, characterized in that it comprises a means.