JPH01173943A - Conduction test system for subscriber system switching module - Google Patents

Abstract

PURPOSE:To perform a conduction test by a simple control at a real call route among a subscriber line local station equipment, a speech path equipment, and a packet signal equipment by testing whether or not a conduction test signal outputted to a transmission channel for test by a test equipment can be received again from a reception channel for test. CONSTITUTION:At a packet signal equipment 19, a conduction signal 26 put on a desired information channel by a line folding means 20 is folded to a transmission side 24 advancing to the speech path equipment 18 as it is. And it is returned to a variable dropper/inserter 17 again via the speech path equipment 18, and furthermore, it is put on the reception channel 23 for test, and is received again at the test equipment 21. In such a way, by comparing the conduction signals 26 transmitted to and received at the test equipment 21, it is possible to perform the conduction test with respect to the real call route of the desired information channel among the variable dropper/inserter 17, the speech path equipment 18, and the packet signal equipment 19.

Description

[Detailed Description of the Invention] [Summary] It relates to a subscriber switching module that provides a user network interface in which a plurality of information channels and one signal channel are time-division multiplexed to subscriber terminals. Concerning continuity testing technology for information channels between subscriber line terminal equipment, communication path equipment, and packet signaling equipment, conduction testing is performed using simple control on the actual call route between subscriber line end equipment, communication path equipment, and packet signaling equipment. The purpose of the test is to include a test device that transmits and receives continuity test signals, and a test device that is installed in the packet signal device and that returns the receiving side of the desired information channel from the communication path device to the same transmission 49 side during the test. line loopback means, installed on the highway of the information channel between the communication path device and the subscriber line terminal device, for disconnecting the link of the desired information channel between the two devices at the time of testing; a variable dropper/dropper connecting the test transmission channel from the device and the transmission side of the desired information channel towards the communication path device, and also the reception side of the desired information channel and the test reception channel towards the test equipment; the variable dropper/inserter, the communication path by testing whether the continuity test signal outputted to the test transmission channel by the test device can be received again from the test reception channel. The apparatus is configured to perform a continuity test of the desired information channel between the apparatus and the packet signaling apparatus.

[Industrial application field]

The present invention relates to a subscriber exchange module that provides a user network interface in which a plurality of information channels and one signal channel are time-division multiplexed to subscriber terminals, and particularly relates to subscriber line width station equipment, communication path The present invention relates to continuity testing technology for information channels between devices and packet signal devices.

[Conventional technology]

As the 15DN (service integrated digital network) enters the commercial stage, there is a demand for the development of simple and reliable continuity testing equipment such as subscriber exchange modules that accommodate and exchange subscriber terminals.

FIG. 8 shows a switching network based on 15DN and a conventional example regarding continuity testing. A subscriber terminal 1 that receives I5DN service is connected to a plurality of lines (for example, two or 23) information channels (hereinafter referred to as B channels) and signal channels for transferring circuit switching control and user packets (hereinafter referred to as D channels). A one-the-network interface is provided.

The subscriber terminal 1 is terminated via a digital highway 2 at a subscriber line terminal equipment (ISLT) 3, and D channel circuit switching control and user packets on the digital highway 2 are used for D channel data link control. It is processed by a D-channel signal unit (ISU!) 4 which processes the procedure, and is sent to a processing unit (PRE!) via a dedicated I' line 9.
) 7, and circuit switching control (call control) of the communication path equipment (INE) 5, user packet switching, etc. are performed here.

On the other hand, the B channel signal on the digital highway 2 passes directly through 15E4 and is exchanged at the intercom channel equipment (INE) 5. Here, the B channel is time-division multiplexed on Digital Highway 2, and in addition to being connected to other stations by circuit switching at 1NE5 for each channel, packet data is divided and loaded on the time-division channel, and packet data is It is also possible to perform packet communication with a packet switch of another station by performing exchange.

In this case, the channel carrying the packet data is INE
5, it is exchanged as shown by a broken line 11 and connected to a B channel packet signaling equipment (IPE) 6. I PE
6 performs B channel data link control procedure processing on B channel packets and connects to the PRE 7 via a dedicated signal line 10. As a result, the B channel packets are exchanged at the PRE 7 and then connected to the packet exchanger of another station.

In the above configuration, the parts other than the subscriber terminal 1 are generally configured as a subscriber exchange module. At the commercial stage, it is absolutely necessary to conduct continuity tests on INE5, lPE6, and the like. As a conventional example for conducting such a continuity test, a test device (TST) 8 is connected to INE5 as shown in FIG. There are some that form a link and perform a continuity test. In this case, TST8 has a function symmetrical to that of IPE6, and IPE6 receives the B channel test packet data sent from TST6, and conversely receives the B channel test packet data sent from PE6. T.S.
A continuity test is performed by receiving at T6.

In addition, the packet data for Tetos on the B channel transmitted from the I PE 6 is looped back at the INE 5 as shown by the broken line 13, and the I PE 6 receives it again.
There are also some that perform a continuity test between INIE 6 and INIE5.

[Problem that the invention seeks to solve]

However, in the above conventional example, when using TST8, the TST8 equipment needs to have the function of transmitting and receiving B channel packets and nodes in a time-division manner, similar to the IPE6, which increases the equipment cost and increases the cost for each test. The test takes a long time to process the packets, and since the B channel link route during the continuity test and the route during actual operation are different as shown in broken lines 11 and 12, the actual call route must be The problem was that not everything could be traced.

On the other hand, when conducting a continuity test by turning the route between IPE6 and 1NE5 as shown by the broken line 13, there is also a problem in that the test range becomes narrow.

In order to solve the above-mentioned problems, the present invention provides a subscriber system that makes it possible to perform a continuity test with simple control on an actual call route between a subscriber line end station device, a communication path device, and a packet signaling device. The purpose is to provide a continuity test method for replacement modules.

[Means for solving problems]

FIG. 1 shows a block diagram of the present invention. Subscriber terminal 14
is provided with a user network interface in which a plurality of information channels and one signal channel are time-division multiplexed via the highway 15, and the one terminal is terminated at a subscriber line terminal equipment 16, Variable dropper/inserter 17 (
(described later) is input to the communication path device 18. here,
In addition to performing general time-division line switching of the information channel, when performing packet communication using the information channel, the channel is connected to a packet signal device 19 for packet processing.

In the present invention, first, the packet signal device 19 includes a line return means 20 for returning the receiving side 25 of a desired 1N broadcast channel from the communication path device 18 to the transmitting side 24 at the time of testing.

This means is realized, for example, by a selector or the like that connects the signal line on the receiving side to the signal line on the transmitting side at the time division timing of a desired information channel during the test.

Next, a variable dropper/inserter 17 installed on the highway 15 between the subscriber line terminal equipment 16 and the communication line equipment 18 disconnects the link of the desired information channel between the two equipment during the test and , connects the test transmission channel 22 from the separately installed test device 21 and the transmitter side 24 of the desired information channel toward the channel device 18, and simultaneously connects the receiver side 25 of the desired information channel to the test device. 21 and the test reception channel 23 going to 21.

The means includes, for example, a selector that extracts data of the test transmission channel 22 at a time division timing, a buffer that temporarily holds the data, and a time division timing of the transmission side 24 of the desired information channel. a selector for inserting data temporarily held in a buffer into the channel; a selector for extracting data from the channel at 250 time division timings on the reception side of the desired information channel; a buffer for temporarily holding the data; and the test. At the time division timing of the reception channel 23 for
This is realized by a selector or the like that inserts data temporarily held in the buffer into the channel.

In addition, the test device 21 includes a logic circuit that transmits a predetermined continuity test signal 26 at the time division timing of the test transmission channel 22, and a continuity test signal 26 that is sent back at the time division timing of the test reception channel 230. This is realized by a logic circuit or the like that compares the receiving logic circuit and the transmitted/received continuity test signal 26 to see if they are equal.

[Function] In the above configuration, the continuity test signal 26 transmitted from the test device 21 via the test transmission channel 22 is sent to the transmission side 24 of the desired information channel toward the communication path device 18 in the variable dropper/inserter 17. The packet signal is placed on the communication path device 18, exchanged according to the actual call route, and input to the receiving side 25 of the packet signaling device 19. The same device 19
Then, the conduction signal 26 that has been placed on the desired information channel by the line loopback means 20 is looped back as it is to the transmitting side 24 which goes to the communication path device 18.

The signal then returns to the variable dropper/inserter 17 via the channel device 18, is further transferred to the test reception channel 23, and is received again by the test device 21.

Therefore, by comparing the continuity test signals 26 transmitted and received in the test device 21, a continuity test is performed regarding the actual call route of the desired information channel between the variable dropper/inserter 17, the communication path device 18, and the packet signal receiver 19. It can be performed.

In this case, since the packet signal device W19 does not need to function during testing, the continuity test signal 26 transmitted and received by the test device 21 does not need to be packet data, and may be a simple test code. Therefore, it is not necessary for the test device 21 to have the same functions as the packet signal device 19 (simple equipment may be sufficient).

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail.

FIG. 2 is an overall configuration diagram of an embodiment of the present invention.

The subscriber terminal 27 receiving the service of the 15DN is connected to a plurality of lines (for example, 2 or 23 (hereinafter referred to as the B channel) and a signal channel for transferring packets for circuit switching control and users (hereinafter referred to as the D channel) are time-division multiplexed. A user network interface is provided.

The subscriber terminal 27 is terminated via a digital highway 28 at a subscriber line terminal (ISLT) 29, and packets for circuit switching control of the D channel and for users on the digital highway 28 are used for data link control of the D channel. Processed by the D channel signal processing unit (PD to L) 36 in the D channel signal device (ISE) 30 that processes the procedure, and sent to the processing device (PRE) 3 via a dedicated signal line 41.
5, and circuit switching control (call control) of the communication path equipment (INE) 32, user packet switching, etc. are performed here.

On the other hand, the B channel signal on the digital highway 43 is transmitted to the variable dropper/inserter (D/1
) 37 and exchanged at the communication path equipment (INE) 32. Here, the B channel is time-division multiplexed on the digital highway 31, and in addition to being connected to other stations through circuit switching at the INE 32 for each channel, packet data is placed on the time-divided channel and packet switching is performed. It is also possible to perform packet communications with packet switches of other stations.

In this case, the channel carrying the packet data is INE
At 32, the route ■ shown by a broken line is exchanged as shown by @, and connected to a B channel packet signaling equipment (IPE) 33. The lPE 33 processes B channel data link control procedures for B channel packets, and connects to the PRE 35 via a dedicated signal line 42 .

As a result, the B channel packets are exchanged by the PRE 35 and then connected to the packet exchanger of another station.

On the other hand, [NE32 receives the control signal 50 from PRE35.
A test equipment (TST) 34 activated by the above is connected.

Next, the variable dropper/inserter (D/
I) The configuration of 37 is shown in FIG. Timing generation circuit 5
8 are control signals 57, 55, . and outputs a control signal 56 for write/read operations of the buffer 59.

The selector 52 inputs the receiving highway 31-2 and, under the control of the control signal 55, outputs the receiving highway 4 as it is.
3-2, or selectively outputs data at a predetermined time division timing to the signal line 53. Signal line 53
The above data is written into the buffer 59 at a timing according to the control signal 56.

Under the control of the control signal 57, the selector 51 changes the transmitting highway 43-1 to the transmitting highway 31-1 as it is.
or selectively outputs the data output from the buffer 59 to the signal line 54 to the transmitting highway 31-1 at predetermined time division timing.

Next, FIG. 4 shows a detailed configuration of the lPE 33 shown in FIG. 2. After the data on the receiving highway 45-1 from the INE 32 is received by the INE interface circuit 38,
It is output to the signal line 46.

The data on the signal line 46 is sent to B via the phase adjustment circuit 62.
The signal is input to a channel packet processing unit (LAPB) 40, where the B channel data link control procedure processing is performed on the B channel packet, and output to the PRE 35 (Fig. 2) via a dedicated signal line 42. be done. The data on the signal line 46 is also transmitted to a variable dropper/inserter (D/inserter).
I) input to the first input of selector 60 in 39;

On the other hand, data input from the PRE 35 (Fig. 2) to the LAPB 40 via the dedicated signal line 42 is packet-processed here, and then sent from the phase adjustment circuit 63 via the signal line 48 to the selector in the D/+39. 60 second input.

A selector 60 in D/+39 is a timing generation circuit 6
1, signal line 46 or signal line 48
The above data is selectively output to the signal line 47. Timing generation circuit 61 is controlled by control signal 49 from PRE 35 (FIG. 2).

The data on the signal line 47 is sent to the INB interface circuit 3.
8 to the transmitting highway 45-2 toward the INE 32 (FIG. 2).

The operation of the embodiment having the configuration shown in FIGS. 2, 3, and 4 will be described above. First, normal communication operation without a continuity test will be explained. In this case, l5E
In the D/137 in 30 (FIGS. 2 and 3), the selector 51 always connects the sending highway 43-1 to the receiving highway 31-1, and the selector 52 connects the receiving highway 31-1 to the receiving highway 31-1.
2 is always connected to 43-2. As a result, the B channel on the highway 43 in FIG. 2 is connected to the INE 32 via the highway 31 and is exchanged here to
connected to.

In IPE 33, the selector in D/+39 of FIG. 4 always connects signal line 48 to signal line 47. As a result, the B channel packet data input from the receiving side highway 45-1 is received by the phase adjustment circuit 62 in the LAPB 40 from the signal line 46, and the
It is sent to the RE 35 (Figure 2) and exchanged in buckets.

Conversely, the B channel packet data input from the PRE 35 to the LAPI 340 in FIG. 2 to INE32 (Figure 2) and sent to another station's packet switch, or Highway 31-2.43-2
．． 28 to the subscriber terminal 27 via the 15LT 29.

Next, the operation during a continuity test will be explained.

During a continuity test, a test signal is sent from TST34 in Figure 2, and is sent from Highway 31 to I5IE via INE32.
30, but at that time on highway 31, for example, 128 time division time slot To''
Of T+2t, time division multiplexing is performed on T+ (time slot). That is, the data passing through the routes ``■'' and ``■'' in the INE 32 of FIG. 2 is the data of the time slot TI.

On the other hand, it is assumed that the B channel which is exchanged from the highway 31 to the 1NE 32 like the routes ■ and @ and which is connected to the 1PE 33 and which is to be tested for continuity, is in the time slot T, for example.

During the continuity test, the test signal on the tights and slot TI transmitted from the TST 34 to Lou] and ■ is input from the receiving highway 31-2 to the D/137, where the time signal on the transmitting highway 31-1 is It is transferred to slot TK and the receiving side highway 45-1 follows route B.
From there, I manually transfer it to I PE33. Then, the D/+39 in the IPIE 33 places it directly on the time slot T on the transmitting highway 45-2 and loops back from the route @ to the receiving highway 31. -2 to the D/137 again. Then, the signal is transferred from the time slot TK to the time slot T+ on the transmitting highway 31-1, and returned to the TST 34 according to the route (3) to be received.

D/1 in ISE30 to realize the above operation.
The operation of 37 (FIG. 3) will be explained using the operation explanatory diagram of FIG. In FIG. 5, the receiving highway 31-
2 to the data input to the selector 52 in FIG. 4, the selector 52 selects the output side signal line 53 at the timing of time slot T1, and the time input via the route of INE 32 (FIG. 2) The test signal in slot T1 is held in buffer 59. Subsequently, the selector 51 selects the signal line 54 from the buffer 59 at the timing of time slot TK, and the transmitting highway 31
The above test signal is transferred to the time slot TK of -1 and output to the INE32 (FIG. 2) route ■. The above operation is indicated by arrow 64 in FIG.

At this time (timing at time slot T), INE3
2 (Figure 2) The data on the receiving fa side highway 31-2 sent from the route @ is sent to the selector 5 in Figure 4.
2 to the buffer 59.

This data is then loaded from the selector 51 onto the transmitting highway 31-1 at the timing of the next time slot TI, and is transferred from the route 0 of the INE 32 (FIG. 2) to the TST.
It will be returned to 34. The above operation is indicated by arrow 65 in FIG. Thereafter, similar operations are repeated (arrows 66, . . . in FIG. 5).

Next, in [D/+39 in PE33 (Fig. 4), at the time slot TKO timing, the selector 6
0 connects signal line 46 to signal line 47. This results in
The data in time slot T input from the receiving highway 45-1 is returned to the transmitting highway 45-2 as is.

An actual continuity test operation sequence based on the above operations is shown in FIG. First, the control signal 49 from the PRE 35 in FIG. 2 instructs the D/139 in the IPE 33 to turn back (FIG. 6a).

Next, from the PRE 35 to the INE 32, the route ■ for the time slot T1 and the tie J.
Set paths for routes ■ and @ for slot TK (
Figure 6b).

Furthermore, by control signal 44 from PRE35, l5E30
The D/137 in the D/137 is instructed to control the connection between the time slots T1 and TK (D/l control) (FIG. 6C).

After the above operations, the TST 34 is instructed to start the test (FIG. 6d).

As a result, first, a test signal is transmitted from the TS'T"34 to the time slot TI (FIG. 6e).

After that, as mentioned above, route ■-I in INE32
D/I 37 in SE30-Route in INE32■-
D/I 39 in IPE33-Route in INE32◎
-D/137 in ISE30-Route in INE32@
The test signal flows along this path and is received again by the TST 34 (FIG. 6f).

As a result, the TST34 compares the transmitted test signal pattern with the received test signal pattern (Fig. 6g), and if they match, the TST34 sends a control signal (not shown) indicating the test result that the set path is correct. By P
Notify RE35 (Figure 6h). If it does not match, we will notify you.

As a result of the above continuity test, the test signal passes through the call route ■Ω of the actual B channel packet, so 1SE30. +N
Accurate continuity testing between Snake 32.1 and PE33 becomes possible.

In this case, by providing a return function using D/139 at the entrance of the IPE 33, the test signal transmitted and received by the TST 34 does not need to be packet data, but may be a simple pattern coat. Therefore, the TST 34 can be realized with a simple configuration.

In the above embodiment, as shown in FIG. 7 (al),
Inserter 70 and Trosova 71 (D/I37 in Figure 2)
), the connection between the IPE side channel 67 and the IPE side channel 68 is disconnected by
An operation is performed to connect the TST side channel 69 to the TST side channel 69, thereby making it possible to conduct a continuity test on the IPE side.

On the other hand, as shown in FIG. 7(b), the dropper 72
, prepare the inserter 73, and insert the l5LT side channel 67.
and l P E (disconnect 11J channel 68,
By connecting the l5LT side channel 67 and the TST side channel 69, continuity testing on the l5LT side becomes possible.

Furthermore, if droppers 74 and 75 are prepared as shown in FIG. 7 (C1), and a predetermined channel between the 15LT side channel 67 and the IPE side channel 68 is taken out and connected to the TST side channel 69, normal service can be achieved. Call monitoring tests are also possible.

The configuration shown in FIG. 7 (bl or (C)) can be realized by improving the embodiments shown in FIGS. 2, 3, and 4.

〔Effect of the invention〕

According to the present invention, a test device equipped with a simple signal transmission/reception function is used to test the actual call route from the subscriber side interface part of the exchange to the input part of the B-channel Paget signal equipment via the channel device. This enables accurate continuity testing.

This makes it possible to provide a subscriber exchange module that is low cost and highly reliable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention, FIG. 2 is an overall configuration diagram of an embodiment of the present invention, and FIG. 3 is an I
Figure 4 is a detailed diagram of the IPE configuration. Figure 5 is an explanatory diagram of the operation of the variable dropper/inserter in ISE. Figure 6 is the v-operation sequence for continuity testing. Figure 7 (al, bl, (C1 is an explanatory diagram of various aspects of the continuity test, Figure 8 is an overall configuration diagram of a conventional example. 14...Subscriber ☆811, 15...Highway, 16...Subscriber line width station device, 17...Variable dropper/inserter, 18...Communication path device, 19...Packet No. 13 device, 20...Line return means , 21...Test device, 22...Test transmission channel, 23...Test reception channel, 24...Information channel (transmission side), 25...Information channel (reception side), 26. ...Continuity test signal.

Claims (1)

[Scope of Claims] 1) A channel device (1) which provides a subscriber terminal (14) with a user network interface in which a plurality of information channels and one signal channel are time-division multiplexed, and which exchanges the information channels. 18), a subscriber line terminal device (16) installed between the device and the subscriber terminal (14) for terminating the information channel, and a subscriber line terminal device (16) installed after the communication path device (18) for terminating the information channel. In a continuity test method for a subscriber exchange module having a packet signal device (19) that performs packet processing, a test device (21) that transmits and receives a continuity test signal (26).
and a line return means (20) which is installed in the packet signal device (19) and returns the receiving side (25) of the desired information channel from the communication path device (18) to the transmitting side (24) during testing. and the communication path device (18) and the subscriber line terminal device (16).
) is installed on the highway (15) of the information channel between the two devices, and disconnects the link of the desired information channel between the two devices during testing, and a test transmission channel (22) from the test device (21). and the communication path device (18)
a variable dropper/dropper connecting respectively the transmitting end (24) of said desired information channel towards said desired information channel as well as the receiving end (25) of said desired information channel and said receiving channel for testing (23) towards said test apparatus (21); an inserter (17), and the test device (21) has the test transmission channel (22).
) by testing whether the continuity test signal (26) outputted to the test receiving channel (23) can be received again from the variable dropper/inserter (17).
, the communication path device (18), and the packet signal device (19). 2) The test device (21) is located after the communication path device (18) and is connected to the test transmission/reception channels (22, 2).
3) is time-division multiplexed on the highway (15) after being time-divisionally exchanged in the communication path device (18), and the variable dropper/inserter (17) is switched on the highway from the communication path device (18). Data of the test transmission channel that has been time-division multiplexed is transmitted to the communication path device (1).
8) into the transmitting side of the desired information channel that is time-divided on the highway towards
) is extracted from the receiving side data of the desired information channel that has been time-division multiplexed on the highway from 1.) and inserted into the test reception channel that is time-division multiplexed on the highway heading toward the communication path device (18). A continuity test method for a subscriber switching module according to claim 1, characterized in that: