JPH09149033A - Atm cross connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily perform an opposite test for which a terminal other than the present terminal is a destination by setting destination information specified in a switching means to the prescribed area of an ATM cell header. SOLUTION: Respective IF packages 21-24 are provided with IF number specifying switches 31-34 for specifying the IF package corresponding to a communicating party. In this case, changeover switches 2 and 4 are knocked down to the side of an IF unit 2. Then, data are sent from a first terminal to the IF1 package 21. Also, the IF number setting switch 31 corresponding to the IF1 package 21 is set to '10' which is the identification code of an IF2 package 22. Then, in the IF package 21, an IF number specifying bit in a COH is set to '10' which is a binary code for specifying the 1F2 package 22 and delivered to an MUX 203. Signals multiplexed in the MUX 203 are inputted to a DMUX 201 as they are, separated and inputted to an output distribution part 202.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of high speed terminals (for example, 150 Mb / s) of a synchronous transfer mode (STM) system.
The STM frame from s) is converted into an ATM cell, multiplexed into 2.4 Gb / s, etc., and distributed to a preset route. Related to testing technology.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional ATM cross-connect device of this type includes a switch (hereinafter, SW) unit 1 and an interface (hereinafter, IF) unit 2 as a pair of changeover switches 3 and 4. Connected via.

The IF unit 2 includes, for example, an IF1 package 21 accommodating a first terminal and an IF2 accommodating a second terminal.
Package 22, IF3 package 23 for accommodating third terminal, IF4 package 24 for accommodating fourth terminal, each I
A multiplexer (hereinafter, MUX) 203 that multiplexes signals from the F package, a separator (DMUX) 201 that separates signals from the SW unit 1, and a DMUX.
It is configured to include an output distribution unit 202 that determines a connection destination from the output signal of 201 and distributes the signal to each IF package. The DMUX 201, the MUX 203, and the output distribution unit 202 form a path distribution (MLDX) package 20. Each of the IF packages 21 to 24 converts an STM frame from each terminal into an ATM frame, and the SW unit 1 sets a communication connection destination for a signal from the MUX 203.

The structure of the output distribution unit 202 is shown in FIGS.
2 and the two types of signals (IN1, IN2) from the DMUX 201 are input to the four decoders 217 to 220. The decoders 217 to 220 have four types of signals (OUT1 to OUT1) according to the combination of the input signals (IN1, IN2).
4) is output. These output signals are provided in four 3-state buffers 221 to 236 for each decoder.
Is input to each control terminal. The input levels of the three-state buffers 221 to 236 are logically fixed, and two types of selection signals (S1, S2) are output according to the outputs (OUT1 to OUT4).

The selection signals (S1, S2) are input to the selection signal input terminals of the four selectors 237 to 240, respectively.
Each IF is connected to the data input terminals of the selectors 237 to 240.
The data from the packages 21 to 24 are input. Then, one of the data is output to each of the IF packages 21 to 24 by the selection signal (S1, S2). Each decoder 217-220
5 shows the relationship between the inputs (IN1, IN2) and the outputs (OUT1 to OUT4) in FIG. 5, and FIG. 6 shows the relationship between the selection signals (S1, S2) and the outputs (OUT) in each of the selectors 237 to 240.

Next, the operation of the cross-connect device having the above configuration will be described. First, the operation during normal communication will be described. Here, as an example, it is assumed that data is transmitted and received between the first terminal and the second terminal.

The data from the first terminal is converted into ATM cells by the IF1 package 21, multiplexed by the MUX 203, and then the SW unit 1 designates the route. In this case, the IF package number (hereinafter abbreviated as “IF number”) for identifying the individual IF packages 21 to 24 is IF.
One package 21 is fixed to the binary code "00", and the IF2 package 22 is fixed to the binary code "10" on the backboard. The IF number and individual decoder 217
Decoder numbers for identifying ~ 220 are 1 to 1 each
It corresponds to.

As shown in FIG. 2, the IF number is converted to ATM after STM / ATM conversion by the IF1 package 21.
It is assigned to 2 bits of "Cell Over Head" (hereinafter, COH) of the cell header, and converted into an IF number ("10") representing the second terminal which is the communication partner in the SW unit 1. The SW unit 1 determines that the communication partner terminal of the first terminal is the second terminal based on the data stored in the area different from COH. The output from the SW unit 1 is separated by the DMUX 201 and output to the output distribution unit 2
02.

In the output distribution unit 202, as shown in FIG. 3, the separated output of the DMUX 201 is input to the corresponding decoder 217. At this time, the output OUT2 is set to "1" by the input of the decoder 217 (IN1 = "1", IN2 = "0"), and the three-state buffer 222 is ready for output. The input of the three-state buffer 222 is fixed to the binary code “00” indicating the IF1 package 21, and this is input to the selector 238 as the output of the three-state buffer 222. In the selector 238, D
The data from the IF1 package 21 received from the MUX 201 is sent to the IF2 package 22.

On the contrary, the data from the second terminal is converted into ATM cells by the IF2 package 22, multiplexed by the MUX 203, and then the SW unit 1 designates the route. The IF number for identifying the communication partner terminal is STM / ATM converted by the IF2 package 22 and then assigned to 2 bits of COH of the ATM cell header. SW unit 1 uses "00" as a binary code for the designated bit of the IF number.
Convert to

The output of the SW unit 1 is DMUX 201.
Are separated and passed to the output distribution unit 202. The COH information for the IF2 package 22 is DMUX201.
Is input to the decoder 218 through the input, and the input (IN1 = 0, IN2 = 0) of the decoder 218 causes OUT1 to be opened and the three-state buffer 225 to be in the output enable state.
The input of the 3-state buffer 225 is a binary code "10" indicating the IF number 2, which is input to the selector 237 as the output of the 3-state buffer 225. As a result, the selector 237 receives the data from the MUX 203. This allows the IF2 package 22
Data is sent to the IF1 package 21.

Returning to FIG. 7, the operation during the operation test will be described. Here, it is assumed that the operation test of the IF unit 2 is performed. In this case, first, both the changeover switches 3 and 4 are tilted to the IF unit 2 side. In this state, SW unit 1
, The designated bit of the IF number in COH is not converted. Therefore, the frame output from the first terminal returns to the first terminal as it is, and the signal output from the second terminal returns to the second terminal as it is.

[0013]

As described above, the IF
In the operation test of the unit 2, for example, the first terminal and the second terminal
When attempting a counter test with a terminal, the counter test cannot be performed because the IF package or the communication partner terminal is not identified without the SW switch 1.
Further, as a result of the operation test, when normal data transmission / reception cannot be performed, it is impossible to determine whether the IF unit 2 has a failure or the SW unit 1 has a failure. Furthermore, A
Before assembling as a TM cross connect device,
There was also a request to perform the operation test of the IF unit 2 by itself.

Therefore, an object of the present invention is to arbitrarily perform an opposite test with a destination other than the own terminal without the SW unit 1 for identifying the IF package or the communication partner terminal and designating the route. Another object of the present invention is to provide an ATM cross-connect device having a configuration that enables cost reduction and quick investigation when a failure occurs.

[0015]

A cross-connect device according to the present invention for solving the above-mentioned problems is a means for converting transfer target data sent from a jurisdiction communication terminal into an ATM cell, and a predetermined area of an ATM cell header to be converted. A plurality of IF packages having destination information setting means for setting destination information of transfer target data, and a route for identifying the destination information set in each IF package and distributing the data from the IF packages to the identified destinations In an ATM cross-connect device equipped with a distribution package,
A switch means capable of arbitrarily designating the destination information is added to the package, and the destination information designated by the switch means is set in a predetermined area of the ATM cell header.

In the ATM cross-connect device having the above-mentioned structure, the individual IF packages are able to determine the destination information designated by the switch means, for example, by the COH (Cell Ove) of the ATM cell header capable of discriminating the route distribution package.
r Head) area.

In a more preferred embodiment, a test changeover switch for selectively guiding an ATM cell containing destination information and transfer target data sent from the individual IF packages to the route distribution package is further provided, and communication is performed. Make sure that a loopback path is formed during the opposite test between terminals.

[0018]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a block diagram of an embodiment of an ATM cross-connect device of the present invention, which corresponds to the configuration of the conventional device shown in FIG. In FIG. 1, parts having the same functions as those of the conventional device are designated by the same reference numerals as those in FIG.

In this embodiment, each IF package 21-
24 is provided with IF number designating switches 31 to 34 for designating the IF package corresponding to the communication partner. One end of each of the IF number designating switches 31 to 34 is connected to the ground line and the other end thereof is located in each of the IF packages 21 to 31.
A pair of switches connected to 24, which guides a signal of logic “0” when turned on and a signal of logic “1” when turned off to each IF package 21-24.

In the following, as an example, a case of performing a facing test between the first terminal and the second terminal in order to confirm the operation of the IF unit 2 will be described.

First, in FIG. 1, changeover switches 3 and 4
To the IF unit 2 side. Then, from the first terminal to the IF
1 Send data to the package 21. In addition, the IF number setting switch 31 corresponding to the IF1 package 21 is set to IF2.
It is set to "10" which is the identification code of the package 22. Then, in the IF1 package 21, I in the COH
F number designating bit that designates the IF2 package 22 2
It is set to "10" which is a decimal code and passed to the MUX 203.

The signal multiplexed by the MUX 203 is directly input to the DMUX 201, separated, and input to the output distribution unit 202. Since this signal does not pass through the SW unit 1, the state of the IF number designating bit in COH remains unchanged (“10”). IF1 package 2
COH corresponding to 1 is input to the decoder 217, and OUT2 of the decoder 217 is set to "1" to make the 3-state buffer 222 ready for output. 3-state buffer 22
The input of 2 is the binary code "00" that represents the IF number "1".
Which is input to the selector 238 as the output of the 3-state buffer 222. In the selector 238, the IF1 package 21 received from the DMUX 201
The data from the IF2 package 22 to the IF2 package 22.

Next, the case of sending data from the second terminal to the first terminal will be described. In this case, the IF number setting switch 32 of the IF2 package 22 is set to the binary code “00” corresponding to the IF1 package 21. IF2
In the package 22, the IF number designating bit in COH is set to "00" by a binary code and is passed to the MUX 203. MU
The signal multiplexed by X203 is DMUX20 as it is.
1 is input, separated, and input to the output distribution unit 202. At this time, since the SW unit 1 is not passed, C
The state of the IF number designation bit in OH remains unchanged ("0
0 ").

The information of COH for the IF2 package 22 is input to the decoder 218, and the O of the decoder 218 is input.
UT1 is set to "1" to make the 3-state buffer 225 ready for output. The input of the 3-state buffer 225 is
The binary code "10" indicating the IF number "2" is input to the selector 237 as the output of the 3-state buffer 225. In the selector 237, the DMU
The data from the IF2 package 22 received from the X201 is sent to the IF1 package 21. Therefore, the first terminal and the second terminal are facing each other.

Although the above is the description of the opposite test between the first terminal and the second terminal, the same operation is performed between all terminals. That is, unlike the conventional case, the facing test can be performed between arbitrary terminals without the SW switch 1 for identifying the communication partner terminal and designating the route. At the time of normal communication, the changeover switches 3 and 4 are tilted to the SW unit 1 side, and the IF number setting switches 31 to 34 provided in each IF package 21 to 24 are binary coded “00” and “,” respectively.
By setting 10 "," 01 ", and" 11 ", the same function as the conventional device shown in FIG. 7 can be achieved.

[0026]

As is apparent from the above description, according to the present invention, the own terminal does not have to be provided with the SW unit for identifying the IF package or the communication partner terminal and designating the route unlike the conventional apparatus. It is possible to conduct a face-to-face test with a destination other than. Therefore, the operation test of the IF unit can be performed by itself at a stage before being assembled as an ATM cross connect device. As a result, there is a particular effect that the manufacturing cost of the ATM cross-connect device can be reduced and the investigation at the time of failure can be carried out quickly.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of an ATM cross-connect device according to an embodiment of the present invention.

FIG. 2 is a COH configuration diagram of an ATM cell header according to the present embodiment.

FIG. 3 is a block configuration diagram of an output distribution unit.

FIG. 4 is a block configuration diagram of a selector included in an output distribution unit.

FIG. 5 is an explanatory diagram of input / output relationships of a decoder included in an output distribution unit.

FIG. 6 is an explanatory diagram showing a relationship between selection signals (S1, S2) and output signals (OUT) in the selector.

FIG. 7 is a block configuration diagram of a conventional ATM cross-connect device.

[Explanation of symbols]

 1 SW unit 2 IF unit 3 changeover switch 4 changeover switch 20 MLDX (route distribution) package 21-24 IF (interface) package 31-34 IF number setting switch (switch means) 201 DMUX 202 output distribution unit 203 MUX 217 ~ 220 Decoder 237 ~ 240 Selector

Claims (3)

[Claims] 1. A means for converting transfer target data sent from a jurisdiction communication terminal into an asynchronous transfer mode (ATM) cell, and a destination for setting destination information of the transfer target data in a predetermined area of an ATM cell header to be converted. ATM cross provided with a plurality of interface packages having information setting means and a route distribution package for identifying destination information set in each interface package and distributing data from the interface packages to the identified destinations. In the connect device, a switch means capable of arbitrarily specifying the destination information is added to each interface package, and the destination information specified by the switch means is set in a predetermined area of the ATM cell header. ATM cross connect device. 2. The individual interface package is a CO of an ATM cell header capable of discriminating the destination information designated by the switch means by the route distribution package.
The ATM cross connect device according to claim 1, wherein the ATM cross connect device is set in an H (Cell Over Head) area. 3. A face-to-face test between communication terminals, further comprising a test changeover switch for selectively guiding an ATM cell including destination information and transfer target data sent from the individual interface packages to the route distribution package. The ATM cross-connect device according to claim 1 or 2, wherein a folding path is formed at times.