JPS58115965A - Channel test system - Google Patents

Abstract

PURPOSE:To offer an economical channel test system provided with a small amount of hardware only, by performing a continuity test for vacant channels at all times, and confirming the normality of the channel to be arranged for communication, in a time division channel device. CONSTITUTION:A signal reception distributor SRD controls a channel memory SPMB0 and writes a test data TD to a test data area TDA. This test data TD appears in a specific appearance of a time switch TS-BW and is read out on a folded line L. A selector SELF connects this signal to the input of a memory SPMF0. Thus, the test data TD is written in a test data area DTA of the memory SPMF0. Next, this data TD is written in one address not used for the communication of channel memories (SPMB1-SPMB7). The test data TD of the memory SPMF0 is transmitted to the distributor via a highway HWSF. The test data of a channel signal area SPA of the memory SPMB1 is transmitted to the SRD, which compares and collates both the test data and detects the coincidence.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication path testing method, and more particularly, to a communication path testing method in a time division communication path device comprising a time switch and a space switch.

Telephone exchanges (2) generally confirm that the connection between the calling party and the called party has been established correctly before the start of the call (=, for each call).
2. It is desirable to perform a continuity test to confirm.

Time-division communication path equipment also requires a continuity test of the communication path, and for this purpose conventionally.

Outside the time-division communication path device, manually insert an inserter and a dropper into the output highway to test the continuity of the outbound and return paths of the set communication path, respectively.
Alternatively, a return route is set from the outbound route to the return route, and continuity of this return route is tested.

However, with the above conventional method, it is necessary to add circuits such as an inserter, a dropper, and a return circuit to the communication path device, which increases the amount of hardware. There were drawbacks such as an increase in the load on processor C2.

The present invention performs a continuous conduction test using an empty communication path of a communication path device as a test object to confirm the normality of the empty communication path,
Continuity testing for each call immediately before the start of a call (by testing the connection path without fail) eliminates the above-mentioned drawbacks of the conventional method, minimizes the amount of hardware that must be added to the communication path equipment, and The purpose of this invention is to provide an economical communication path test method that does not increase the load on the processor.

Embodiments of the present invention will be described below with reference to two drawings C.

FIG. 1 is a block diagram showing the configuration of a time-division channel device embodying the present invention. In Figure C2, TS-FW is a forward time switch, SSW is a space switch, and TS-FW is a forward time switch, SSW is a space switch, and TS-FW is a forward time switch.
BW is a packed word time switch. , SPMFo, SPMF
I~SPMF7 are forward time switches TS-FW
The communication path memory is controlled by a communication path holding memory (not shown), and the call connection (first, as is known in the art) sets two communication paths.

Note that SPMB0 to SPMBv are communication path memories of the packed word time switch TS-BW, and are controlled by communication path holding memories (not shown) in the same way as in the forward time switch TS-FW. (Set up a double channel.

the channel memories SP MFI-SP MFW and SPMB;

~S P MBy divides its memory area (address) into two, and uses one as a non-speech signal area NSPA and the other as a speech signal area SPA.

Call path memo 9 SPMFo and SPMBO handle non-call signals and test data signals in this embodiment (2) and do not handle call signals, but like other call path memories, their memory areas ( Address) is divided into two areas, one area N5PA (non-call signal area) is left unused with no address set, and the other area is further divided into a service tone area STA and a test data area TDA l-2. Assign.

MPXg, MPXI= MPX? is a multiplexer.

The multiplexer MPXo uses one-half of its input terminals, and each input terminal (2) connects a service tone source (digital signal). It is time-division multiplexed onto the word highway HWF0 and passes through the selector SELν to the forward time switch T.
The channel memory 8PMFol2 of the S-FW can be reached and its service tone area STA+=written.

Multiplexer MPX+l2 accommodates the transmitting line from the telephone, for example. The signal sent from the telephone S is digitized via the 2-wire 4-wire coupler of the subscriber circuit H8, inputted to the Malteplex f MPXI, and sent to the forward highway WWF along with the signals from other telephones (~Sn). Time-division multiplexed and corresponding call path notes!
JSPMF, two people working, non-call signal in area N5PA
(The second call signal is incorporated into the area SPA.

Here, the communication path memory S PMF stores the lines (telephones 81 to S PMF) accommodated by the corresponding multiplexer MPX.
The number of addresses corresponding to the number n of lines from n to area N
5PA, 5PAI:, respectively. The same applies to the other channel memories SPMFt to SPMFW.

Writing and reading in the forward time switch TS-FW is performed ζ1 as shown in FIG. 2I-2. In Figure C2, TS indicates one time slot assigned to one line (2), and one time slot is divided into four cycles, namely, the non-speech signal write cycle w1, (sequential write), The read cycle R1 (random read), the write cycle of the speech signal (individual write) and the read cycle R2 (random sequential write) are divided into two parts. It is assumed that it is read out and reaches the signal reception and distribution device SRD, and in the read cycle, it is read out from the intermediate highway HWMF 11 for speech signals and reaches the space switch SSW.

Writing and reading in the packed word time switch TS-BW is performed by the cycle shown in FIG. In Fig. 2 (■), one time slot TS assigned to one line (two lines) is divided into four cycles, namely, a non-call signal read cycle R1 (sequential read), a write cycle WJ (random write), Call signal read cycle R: (sequential read), write cycle morning (random write) is divided into four cycles (divided into two. Here, the signal is read cycle RI', the signal highway HWSB
It is assumed that the upper C2 is read out and reaches the signal reception distribution device SRD, and in the read cycle R2', it is read out to the speech signal packed word highways HWB1 to HWBy, and reaches the demultiplexer DMpx;~DMPXIl=, where it is multiplexed. separated. For example, the demultiplexer D
The outputs of MP
It is decoded (converted into an analog signal) by the P! ASI-Sn is reached.

For example, a speech signal sent from the telephone S1 is converted into 2-wire and 4-wire signals by the subscriber circuit H6, digitized, and time-division multiplexed by the multiplexer MPXI.
The communication signal area (2) of the communication path memory SPMF of the FW is reached, and the time slots are exchanged here, and the intermediate highway HWMF (= read out, and the space switch 55w is connected twice. Furthermore, from this, the intermediate highway H
Outputs WMBl2, passes through selector 5ELB, and outputs the communication path memo 98PMD of packed word time switch TS-BW.
II = reached, this speech signal area 5PA (= written, further (replaced the N time slots, read out the backward highway HWBI l1, demultiplexed by the demultiplexer DMPX + "C", and sent to the telephone set Sn
The telephone 5nl- is sent through the subscriber circuit un of
It can be received as a reception signal. Similarly, the transmission signal sent from telephone Sn can be used to communicate with two telephones S and I in a row.

Service tones ST, such as dial tones, busy tones, etc., are input from terminal ST in the form of digital signals to multiplexer M P SPMO service tone area STA
is written in the write cycle h (= of FIG.
Call signal area SPA of BW call path memory SPMB+
It is possible to write (= written and read out from here to reach the telephones 81, 8n, etc.) and send out service tones such as dial tones and busy tones.

Both speech signals and service tones are sent via the communication path set from the forward time switch TS-FW to the backward time switch T8-BW as described above.

On-hook, off-hook information, dialing information, etc. of subscriber telephones are sent to both time switch TS- as non-call signals.
FW and TS-BW channel memory 8 PMF, ~S
The non-call signal area N5PA of PMF and SPMB+ to SPMB can be used as a refresh memory for reception and distribution.

Similarly to the above, non-communication signals between trunks can be received and distributed using the C1 non-communication signal area N5PA.

A communication test is carried out in the communication path device shown in FIG. 1 as follows.

First, from the signal reception distribution device SRD, the baraqua.

When the selector 5ELB, which is split into two input parts C of the mode time switch TS-BW, is switched to the test data line TD8, and the test data TD (for example, 8-bit digital data similar to a telephone call signal) is sent from the signal reception and distribution device SRD. (2) The communication path memo 98PMB of the packed word time switch TS-BW is controlled and written in the above test.
The specific aviance of W (2 appearances, folding line L (=read out). This read cycle R2' and the -1 write cycle W2 of the forward time switch TS-FW are as shown in FIG. 2 (= (1 It is determined that the two branches coincide temporally.

In this cycle (-), the selector SEL sends the signal on the return line under the control of the signal reception and distribution device SRD to the communication path memo 9 of the forward time switch TS-FW.
The inputs of SPMFo (2) are connected. Therefore, in the readout cycle R2' (-) mentioned above, the readout test data TD is The readout cycle R2' and temporally (2) matching plastering cycle %
(See FIG. 2) (In step 2, the data is written to a certain address in the test data area DTA of the speech path memory SPMFo, for example, a hatched address.

Next, this test data TD is stored in the communication path memory SPMF.
, (forward time switch, , tsu, ti TS-FW), 'l Figure 2 I (= read cycle R1 shown)
2, the bank word time switch TS-BW's channel memo 9 (SPMB, ~ One of the addresses (SPMBy) not used for calls is written.

The above write and read control and selector 5EI
J.,5ELB switching control is performed via the signal reception and distribution device SRD under the control of a processor (not shown) during the phase of control for regular call connection.

For example, if a certain address in the call signal area SPA of the call path memo 98PMB of the packed word time switch TS-BW, for example, an address with diagonal lines, is vacant, then the address (1 free call Test data TD is written to this address (2) via the path.

Next, the test data written in the diagonally shaded address of the test data area TDA of the forward time switch TS-FW's communication path memo 98PMFo □TD
is read at R1' in Figure 2 I, and the signal line highway HW
Signal reception and distribution device (=sends) via SF.

On the other hand, the test data TD written in the hatched address of the speech signal area SPA of the speech path memory SPMB of the packed word time switch TS-BW is shown in FIG.
R1' (2, read, signal highway HW8
The signal is sent to the signal receiving and distributing device SRD via B.

The signal reception distribution device SRD receives the respective test data sent from both signal ways HWSF and HWSB, compares and collates them, and detects a match.

When a match is detected, it is determined that the communication path between the forward time switch TS-FW and the packed word time switch TS-BW has been set correctly. When a mismatch is detected, it is determined that the above communication path is not set correctly.

In the above, after writing the test data TD to the free address of the channel memory of the forward time switch TS-FW, as described above (2.
S-BW free addresses, i.e. addresses not used for calls (2) Sequentially (2, Forward time switch TS-FW call path memory addresses (1) unused addresses (= written test) The data is transferred to the packed word time switch TS-- via an empty channel that could be used as a speech path, but is not currently used for speech.
It is transferred and written to a free address in the BW's communication path memory in the same way as for the communication signal. Therefore, when an empty channel is set as a dual channel, a test to see if it is normal can be performed at all times.

In the above embodiment, the forward time switch TS-F
The communication path memory of the W and packed word time switch TS-BW is line-compatible (each has an address for two calls and one for non-calls, and the communication path memory itself is divided into multiple pieces. It is also possible to configure one communication path memory with a smaller number of addresses, and if transfer of non-communication signals is not necessary, no area is required for this signal.

The loop back line used to loop back the signal from a specific appearance of the packed word time switch TS-BW to the input end of the forward time switch TS-FW is for use with other services (- be able to.

The present invention is not limited to the above embodiments, and various modifications are possible. The present invention can be implemented in a channel device having time switches on the forward side and the backward side, and is not limited to the three-stage configuration of T-8-T in FIG. 1. It is also possible to provide one channel memory for each time switch and control with one channel holding memory.

Since the present invention is configured as described above, in the time-division channel device, there is always an idle channel (empty channel).
Continuity test is performed on the communication line equipment for communication (=
By checking the normality of the call route to be set,
Adding a small amount of hardware to the channel device has the effect of providing an economical channel testing method.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing the timing of write and read cycles in the present invention. TS-FW・・・Forward time switch, SSW・
...Space switch, T8-BW...Backward time switch, SPMFo, SPMFI ~ SPMF7
''Forward time switch channel memory, SPM
Bo, SPMBI to SPMB7... Packed word time switch channel memory, MPXo, MPXI
~MPX)...Multiplexer, 81~Sn...Telephone, H3~Hn...Subscriber circuit, HWFo-HWF
Forward Highway, HWMF, HWM
B... Intermediate highway for calls, HWS F, HW
S B ・・・Highway for non-call signal, D MP
r~D MP Xq... Demultiplexer, HWB,
~HWB... Packward Highway, SEL,
, 5ELB...Selector, L...Return line, TDS...Test data line, SRD...Signal reception and distribution device, N5PA...Non-call signal area, SPA.
...area for call signals, STA...area for service tones, TDA...area for test data Patent applicant: Fujitsu Limited Agent Patent attorney Gobe Tamamushi (3 others)

Claims (1)

[Claims] In a time-division communication path device that is composed of a time switch and a space switch, and is configured by placing time switches on the forward side and the packword side (= time switches respectively), the specific appearance of the packword time switch is folded into the forward time switch. Means for reading test data from the return line and forward time switch channel memory to the signal reception distribution device, and means for writing test data from the signal reception distribution device to the channel memory of the packed word time switch. and means for reading test data from the communication path memory of the packed word time switch to the signal reception distribution device, writes the test data into the communication path memory of the packed word time switch, and transfers the test data to the return line. and write it to the forward time switch's channel memory via the free channel, and write it to the punctual time switch's channel memory via the free channel, and
Further, the test data written in the forward time switch communication path memory (2) and the test data written in the communication path memory of the packed word time switch are read out and compared with each other. Call path test method.