JPH0787456B2 - Self-routing switch - Google Patents

Description

DETAILED DESCRIPTION [Outline] The present application autonomously switches input information by each self-routing module of a multi-stage configuration based on control information added to the input information, and instructs by the routing control information. In the self-routing switch that sends the data to the output terminal, the test data is generated according to the test request, the test data of the communication path is inserted into the input information, the communication data is passed through the communication path, and the test data is collected to facilitate fault identification. It is something that is done.

[Industrial application field]

The present invention relates to a self-routing switch, and more particularly to testing of a self-routing switch suitable for switching high speed packets.

In telephone exchange (circuit exchange), once a call path is set, the call path is maintained until the call ends.

In the case of multiplex transmission, each call (channel) can be switched at high speed, but since the position of each call on the frame is constant, simple sequential switching is sufficient.

On the other hand, in packet switching, each packet has its own destination, and the destinations of each packet in time series are different. Therefore, both of the above methods cannot be adopted, and the processor once fetches them in its memory and outputs them. The method of distributing to the line (memory storage exchange) is adopted.

However, this memory storage exchange system requires time, and is not suitable when high-speed exchange is required.

Self-routing switches are particularly suitable for fast switching to different outgoing lines for each packet, such as high-speed packet switching, and when it is not desirable to centrally control the communication path from the outside with software. . In the self-routing exchange, a correspondence table of the virtual call number (VCN) of each call as an identification number and the number of its outgoing line is created, and when the call of that virtual call number arrives, the corresponding table is referred to and the outgoing line number is referenced. And then send the call to the outgoing line for packet switching.

In such a self-routing exchange, it is necessary to be able to test whether the input information travels accurately along the speech path.

[Conventional technology]

FIG. 7 shows an example of the conventional self-routing exchange described above, which is n × m (first stage), k × y (second stage), which is connected to the corresponding outgoing route side by routing information. A self-routing module SRM _ij of z × g (third stage) unit is connected as shown in the figure. This module SRM functions as a packet switch.

When a call originates from a terminal device (not shown) prior to data transfer and a call is set up, the signal control unit SGC receives a control packet for the call setting via a signaling channel and allocates it to the control channel. Based on the assigned virtual call number (VCN), a new virtual call number on the outgoing side of the exchange is assigned and routing information in the communication path is assigned. Then, the processor CPU sets these pieces of information in the conversion table in the converter CNV connected to the terminal device.

In the converter CNV, based on the header information (VCN) of the input data from the data channel, as shown in FIG. 8, the conversion table is searched from the header A of the data packet information of the input side, and the new output header B and Routing information "5,3,
"7" is added before the packet information and transmitted.

As shown in FIG. 9, the exchange as a whole receives the information, and the self-routing module SRM of the first stage first selects and outputs the outgoing line "5" based on the information "5". Two
In the third row, the outgoing line "3" is selected based on the information "3", and in the third row, the outgoing line "7" is selected and output based on the information "7". During this time, the routing information is dropped one by one as it passes through the self-routing module SRM.

The specific structure of each self-routing module SRM is shown in FIG. 10, and ROT is a FIFO memory M as a corresponding Queue buffer according to the routing head information (this corresponds to the outgoing line of the module). The FIFO memory M sends a transfer request signal to the controller CTL when the data is stored. The controller CTL judges this transfer request and selects one of the FIFO memories M selected by the selector SEL.

An example of the controller CTL is shown in FIG. 11, and each selector (SEL) 10 shifts the transfer request (* 1, * 2, ... * n-1, * n) from the FIFO memory M one by one. To the adder (ADD) 14 via the fixed priority circuit 12 and the encoder 13 based on the command value from the counter 11. The adder 14 adds the command value ahead of the counter 11 and the transfer request number (* 1, * 2, ... * n-1, * n) indicated by the output of the encoder 13 to generate the number of the relevant FIFO memory. Fig. 8 selector
Send to SEL. The command value to the selector SEL is returned to the controller (CNT) 15 and a transfer OK signal is output to the FIFO memory M that has made the transfer request. Then, when the signal of which the transfer is completed is received from the FIFO memory M, the signal for increasing the count value of the counter 11 is counted.
Send to 11.

As a result, the selection signal of the selector 10 is increased by "1", for example.

In this case, when two or more transfer requests overlap, the fixed priority circuit 12 sends a transfer request signal to the encoder 13 in a predetermined priority order (for example, from the top in the figure).

In this way, multiple self-routing modules SRM
Switches autonomously and sends data packets.

[Problems to be solved by the invention]

In the above conventional self-routing switch, when it becomes necessary to test the self-routing module SRM and the speech path, there is a problem that the speech path to be tested cannot be set without disturbing normal data transfer. there were.

Therefore, it is an object of the present invention to realize a self-routing exchange that can easily test a communication path as needed without hindering normal data transfer.

[Means for Solving Problems] FIG. 1 is a conceptual diagram of a self-routing exchange according to the present invention for achieving the above-mentioned object, and 1 is a control means, a CNV.
Is a converter that adds routing information to the input information based on the call control information to the control means 1, and SRM _{1I to} SRM _3j are multi-stage self-routing modules that receive the input information and the routing information from the converter CNV. The SRM _{1I to} SRM _3j switches autonomously and sends input information to the output side terminal specified by the routing information.

Further, in the case of the present invention, a test module which generates the test data having the same block length as the input information, which is composed of the routing information and the fixed channel information including the first-stage self-routing module information based on the test request signal to the control means 1. Two
Is provided and the converter CNV transfers the test data when the input information is empty, and returns the test data from the self-routing module at the final stage to the control means 1.

[Action]

In the self-routing exchange of the present invention shown in FIG. 1, the control means 1 is provided with call control information from the terminal device, and the control means 1 adds routing information to the input information to the exchange in the converter CNV based on this. Send to routing module SRM _1I to SRM _3j . Each self-routing module selects each outgoing line according to the input routing information and transfers data while deleting the routing information.

On the other hand, when the control means 1 receives the test request signal, it instructs the test module 2 to generate test data. Control means 1
When receiving from the test module 2 the test data composed of the fixed channel information including the routing information as the outgoing line information and the first-stage self-routing module information, the corresponding converter CN from the first-stage self-routing module information.
Transfer test data to V. The converter CNV inserts test data of the same block length when the input information is empty so as not to interfere with the transfer of the input information. After that, the self-routing module at each stage is selected according to the routing information, and the self-routing module at the final stage detects the test data and returns the test data to the control means 1. Control means 1
In the test data, the routing information is dropped and only the fixed call path information remains, so that it is possible to identify the failure of the call path by combining some of this call path information.

〔Example〕

Embodiments of the self-routing exchange according to the present invention will be described below.

FIG. 2 shows an embodiment of the self-routing exchange of the present invention shown in FIG. 1. In this embodiment, the first-stage and last-stage self-routing modules SRM are duplicated, and the first-stage duplication is adapted. The converter CVN is also duplicated. One of these duplicated self-routing modules is selected to be active by a processor CPU as a control means.

FIG. 3 shows an example of test data obtained by the control means 1 from the test module 2 in response to a test request. The test data includes routing information and call path information,
,, and, and the routing information is 1
Outgoing line number 1 of the self-routing module SRM of the first stage
m and routing information indicate the output line numbers 1 to y of the second-stage self-routing module SRM, respectively, and these routing information are normal routing information. Further, the routing information is composed of an identifier indicating that it is test data (for example, information in which all bits are "1").

The call path information is fixed and does not change.
In addition to the same information as the routing information, it includes routing information indicating the incoming line number of the first-stage self-routing module SRM and routing information indicating the number of the first-stage self-routing module SRM itself.
Note that the routing information is numbered for all duplicated first-stage self-routing modules SRM, and one module SRM can be selected.

Next, the operation of this embodiment will be described with reference to the data flow chart shown in FIG.

First, when the processor CPU receives a test request signal from, for example, a maintenance console (not shown) in addition to the normal call control information, it transmits this to the test module 2. A program for generating test data is stored in the test module 2, and the test module 2 generates corresponding test data depending on which communication path this test request signal is for.

In the example of FIG. 4, the test data is “8” “1” “F”.
It is "8", "1", "1", "1", and this test data is competitively controlled by the converter CNV with normal input data.

FIG. 5 shows how contention control is performed when the data has a fixed length. Normal data is transferred in block (fixed length) units, and when there is no transfer data, an empty display is displayed in the header of the block. x is displayed. When the converter CNV receives the test data, it inserts the test data at the position of the empty data block. Therefore, the block length of normal data and the block length of test data must be the same.

In this way, the test data inserted into the normal data under the competition control is the self-routing module SR of the first stage.
The input line number "1" of the first module SRM of M is input, and the output line number "8" is output. Therefore, the incoming line number "1" of the "8" th module SRM is selected as the second-stage self-routing module SRM. When input to the module SRM of the second stage, "8" of routing information is dropped in the same manner as normal routing information.
Then, from the module SRM of the second stage, the outgoing line number “1” is passed according to the routing information, and the routing information and the line number of the first module SRM are dropped to the third stage, that is, the module SRM of the final stage. It is input to "8".

On the other hand, as for normal data, the routing information is added by the converter CNV as shown in the figure, and the first module S of the final stage is added.
It is output from the RM outgoing line number "8".

The configuration of this final-stage module SRM is shown in FIG. 6, and the module SRM shown in this figure and FIG. 10 (this is the first-stage and second-stage module SR in FIGS. 2 and 4).
(Used for M) is that when a predetermined code is input to the selector ROT, that data is returned to the processor CPU. In this example, all bits are "1". When the test data identifier is entered Selector ROT
Detects this and the remaining communication path information "8""1""1"
Only "1" is returned to the processor CPU.

The processor CPU indicates that the returned call path information indicates that the call path is normal. However, if the call path information does not return, part of the call path may be in a failure state. Yes, it is possible to identify the failure location by combining with the returning call path information.

If the failure location cannot be identified by the combination of the communication path information of the sent test data, another combination,
For example, duplicated first-stage or final-stage module SR
The failure location can be specified by switching M.

〔The invention's effect〕

As described above, according to the self-routing exchange of the present invention, the test data of the same block length is inserted into the normal data, and the fixed communication path information in the test data is returned to the source to identify the failure of the communication path. Since it is configured to perform the above, it is possible to easily test the situation of the communication path as needed without affecting the normal traffic.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a self-routing exchange according to the present invention, FIG. 2 is a view showing an embodiment of a self-routing exchange according to the present invention, and FIG. 3 is a view showing an example of test data used in the present invention. 4 is a diagram for explaining the operation of the embodiment of the present invention, FIG. 5 is a diagram for explaining the data multiplexing in the converter CNV used in the present invention, and FIG. 6 is used in the present invention. FIG. 7 is a diagram showing a configuration example of a final stage self-routing module SRM, FIG. 7 is a block diagram showing a configuration of a conventional self-routing switch, FIG. 8 is a diagram showing an operation principle of the converter shown in FIG. 7, and FIG. FIG. 10 is a diagram showing a general operation principle of a self-routing exchange, FIG. 10 is a block diagram showing a configuration example of a self-routing module used in a conventional example, and FIG. 11 shows a configuration of a controller CTL used in FIG. Is a figure . 1 and 2, 1 is a control means, 2 is a test module, CNV is a converter, SRM is a self-routing module, and CPU is a processor. In the drawings, the same reference numerals indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eisuke Iwabuchi 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Toshinoma Fukui 1015 Kamedota, Nakahara-ku, Kawasaki, Kanagawa (within Fujitsu Limited) 56) References Special table Sho 59-501849 (JP, A)

Claims (3)

[Claims] 1. A converter (CNV) adds routing information to input information based on call control information to a control means (1), and autonomous switching is performed by each self-routing module (SRM _ij ) having a multi-stage configuration. In a self-routing exchange for sending to the output side terminal instructed by the information, based on a test request signal to the control means (1), the routing information and fixed speech channel information including self-routing module information of the first stage are input. Providing a test module (2) that generates test data with the same block length as the information,
The converter (CNV) transfers the test data when the input information is empty, and the control means (1) receives the test data from the self-routing module at the final stage.
A self-routing exchange characterized by being returned to. 2. The self-routing exchange according to claim 1, wherein the self-routing modules at the first stage and the last stage are at least duplicated and are switchable. 3. The routing information of the test data includes a test data identifier, and when the final self-routing module detects the test data identifier, the fixed channel information of the test data is transferred to the control means (1). ) A self-routing exchange according to claim 1.