JPS61164361A - Continuity test system - Google Patents

Abstract

PURPOSE:To execute the continuity test of plural communication channels by setting simultaneously plural reflected loops for continuity test to a communication channel between a preceding station and a succeeding station of a relay exchange so as to use one kind of continuity test device thereby transmitting one continuity test signal. CONSTITUTION:The preceding station 1a sends a head address message 12 to a common line signal channel 4 through a common line signal device 3a and the succeeding station 1b uses information representing idle equivalent communication channels 8a, 8b included in a message 12 so as to constitute the reflected loop to the unit communication channels 8a, 8b. The preceding station 1a connects a transmission port of the continuity test device 5a to a transmission channel 9a to constitute the reflected loop between a reception channel 10a and a transmission channel 9b, and the reception channel 10b and a reception port of the continuity test device 5a to send a continuity test signal 13 from the continuity test device 5a. When the continuity test signal 13 is discriminated by the continuity test device 5a, the preceding station 1a sends a continuity test successful message 14 to the succeeding station 1b.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to continuity testing of communication lines.

[Conventional technology]

FIG. 6 shows a conventional example, in which 1a and 1b are transit exchanges, 3
a, 3b are common line signal devices, 4 is common line signal device 3a
, 3b, 5a and 5b are continuity test devices for the trunk line 10, 10 is a relay line 1a between the trunk exchanges, and 1
This is a trunk line that connects b.

FIG. 7 shows the configuration of a communication channel when carrying out the continuity test in FIG. 6, and the same reference numerals as in FIG. 6 are completely the same. 11a indicates one line of the trunk line 10.

FIG. 8 shows the signal sequence when conducting the continuity test in FIG. 7, in which 12 is an initial leading message, 13 is a continuity test signal, and 14 is a continuity test success or failure message.

Next, the operation will be explained. First, the trunk switching system in FIG.
An analog or digital multiplex line is used, and common line signaling devices 3a and 3b controlled by trunk exchanges 1a and 1bK are provided at both ends of a common line signal channel 40 separated from this trunk line 10. Common channel signaling is used. Furthermore, a continuity test device 5a or 5b is used to connect the trunk line 10 for calls between the trunk exchanges la and 1b. In such a trunk switching system, when a digital multiplex line is used for the trunk line 10, the digital multiplex line is a communication channel 7a+ having a transmission speed for carrying one call, as shown in FIG.
7b +...7n, and a frame 6 indicating the repetition period of one channel (in this case, one frame consists of n channels), but this is true when there are n trunk lines 10 in Fig. 6. is equivalent to

Now, the relay exchange 1a is referred to as the preceding station, and the relay exchange 1b is referred to as the subsequent station, and hereinafter, the relay exchange 1a is referred to as the preceding station, and the relay exchange 1 is referred to as the preceding station.
7 and 8, we will explain the operation when one call reaches the preceding station 1a from another station (not shown) and then extends the connection to the succeeding station 1b. explain. First, the preceding station 1a connects the trunk line 10 to the succeeding station 1b with an empty relay WI.
When M11a is selected, the first address message 12 shown in FIG. 8 is sent to the common line signal channel 4 through the common line signal device 3a. This head address message 12 includes information indicating the vacant trunk line 11a and information necessary for the subsequent station 1b to further connect the call to the next station. The downstream station 1b that receives the head address message 12 via the common line signaling device 3b uses the information indicating the vacant trunk line 11a included in the head address message 12 to create a return loop within the exchange 1b as shown in FIG. Set. After sending the above-mentioned head address message 12, the preceding station 1a generates a continuity test signal to the vacant trunk line 11a, and transmits the eighth A continuity test signal 13 shown in the figure is sent to the trunk line 11a. That is,
The transmitted continuity test signal 13 is returned at the downstream station 1b,
The signal is received again by the continuity test device 5a of the preceding station 1a. At this time, if the continuity test signal is discriminated by the continuity test device 5a, the continuity test of the preceding station 1a is successful and the relay is started! 113 is confirmed and confirmed, a continuity test success message 14 shown in FIG. 8 is sent to the downstream station 1b via the common line signal device 3a. At the same time, the preceding station 1a is connected to the trunk line 11.
A is disconnected from the continuity test device 5a, and further connected to the relay line 11b from the previous station 1a to restore the original state. On the other hand, the subsequent station 1b, which has received the continuity test success signal 14 via the common line signaling device 3b, releases the return loop for the continuity test, performs the same operation as the previous station 1a, and continues the call to the next station. station (not shown).

[Problem that the invention seeks to solve]

Conventional continuity tests for trunk lines were performed as described above, so when trunk lines use digital multiplex circuits and multiple traffic connections are made on the trunk lines, continuity testing equipment should be used to match the type of call transmission speed. It is necessary to install the continuity test equipment accordingly, and even if one type of continuity test equipment is used for calls with the lowest transmission speed, it may be necessary to perform continuity tests multiple times for calls with higher speeds. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to conduct continuity tests on trunk lines with various transmission speeds by sending a continuity test signal once using one type of continuity test device. The purpose is to obtain a continuity test method that

[Means for solving problems]

The continuity test method according to the present invention adds information indicating the channel position occupied by the connecting call to the information included in the head address message sent from the preceding station to the succeeding station, and The station sets loops as many as the number of channels occupied by the call, and the transmission continuity test signal from the continuity test device of the previous station passes through all of the loops and is then received again by the continuity test device of the previous station. It is designed to set up a return loop to do this.

[Effect]

In the continuity test method of this invention, after the continuity test signal transmitted from one type of continuity test device passes through all the loops made up of the subsequent station and the previous station, that is, all the channels occupied by the call are Since the communication is received by the continuity test device after passing through, continuity tests of multiple equivalent communication channels can be easily performed in one test.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1a and ib are transit exchanges, 2 is a trunk line using a digital multiplex line connecting between the transit exchanges 1a and 1b, and 3a and 3b are transit exchanges 1a and 1.
a common line signal device controlled by bK; 4 a common line signal channel connecting the common line signal devices 3a and 3b; 5a;
, 5b is a continuity test device.

In FIG. 2, 7 a + 7 b *...In are the basic unit communication channels constituting the digital multiplex line 2, and 6 indicates the repetition period of each communication channel 7a to 7n in the digital multiplex line MK. It is a frame.

In FIG. 3, 8 a* 8 b #...8n spatially replaces the digital multiplex line of trunk line 2 in FIG. 2, and each communication channel 7 a' 7 b *...
・This is an equivalent communication channel shown as a unit digital trunk line corresponding to Tn.

In FIG. 4, 9a and 9b are transmission and reception channels of the equivalent communication channel 8a in FIG.

The reference numerals in FIG. 5 are exactly the same as the same reference numerals in FIG.

Adjacent repeater/switcher 1a as shown in FIG.

In the trunk line 2 between 1b and 1b, a communication channel 7a is the basic unit of transmission speed as shown in FIG.

7b, . Position station 1a and rear station 1b
(in this case, the lowest speed is the transmission speed of one communication channel, The maximum is the transmission speed of one communication channel x
n times the transmission speed of one frame), a multi-traffic connection is established in which calls having an arbitrary transmission speed are relayed on one trunk line 2. The operation of the continuity test method in this case will be described below.

First, the communication channels 7a to 7n of the digital multiplex trunk line 2 having the 7-frame 6 configuration shown in FIG. 2 are replaced with spatially equivalent communication channels, that is, the equivalent communication channels 8a to 8n shown in FIG. I will explain.

As in the conventional example, when a call reaches the preceding station 1a and then extends the connection to the succeeding station 1b, first the preceding station 1a:
Furthermore, equivalent communication channels 8a to 8 are allocated to vacant trunk lines 8 according to the transmission speed (or number of dedicated communication channels) of the call notified by the common line signal from the previous station.
2 channels out of n, e.g., equivalent communication channel 8
Select a, 8b.

First, the preceding station 1a sends a head address message 12 shown in FIG. 5 to the common line signal channel 4 through the common line signal device 3a. This head address message 12 includes empty trunk lines, that is, equivalent communication channels ga and 8b.
and information necessary for the downstream station 1b to further connect the call to the next station.

Head address message 1 via common line signaling device 3b
2, the downstream station 1b receives the first address message 12.
As shown in FIG. 4, a return loop is constructed for the unit communication channels 8a, 8b VC using the information indicating the empty equivalent communication channels 8a, Bb included in the VC.

After sending the head address message 12, the preceding station 1a connects the transmission port of the continuity test device 5a and the equivalent communication channel 8.
The transmission channel 9a of the busy equivalent communication channel 8a is connected to the reception channel 1a of the busy equivalent communication channel 8a and the transmission channel 9b of the equivalent communication channel 8b, and a return loop is formed between the reception channel 1a of the busy equivalent communication channel 8a and the reception channel 1 of the equivalent communication channel 8b.
Connect ob and the reception port of the continuity test device 5a. After that, the continuity test signal 13 is sent out from the continuity test device 5a.

This signal sending operation causes the continuity test device 5a of the preceding station 1a to
When the continuity test signal 13 is discriminated, the preceding station 1a sends out a continuity test success message 14 to the succeeding station 1bK, indicating that continuity between the equivalent communication channels 8a and 3b has been confirmed.

At the same time, the preceding station 1a releases the path between the continuity testing device 5a and the equivalent communication channels 8a and 13b, and the return loop between the equivalent communication channels 8.8°8b, and furthermore releases the equivalent communication channel ( (not shown).

The downstream station that has received the continuity test success signal 14 shown in FIG.
Perform the same operations as in a to further connect the call to the next station.

In the above embodiment, the case where one transmission rate of a call monopolizes two communication channels was explained as an example, but even when three or more channels are monopolized, the continuity test can be performed in the same manner.

Further, in the above embodiment, 1a and 1b are relay exchanges, but one or both may be subscriber exchanges.

Further, the present invention is not affected by the transmission speed of one communication channel, the number of communication channels in one frame, the substance of the continuity test signal, the expression format of the common line signal, the transmission method, etc.

〔Effect of the invention〕

As described above, according to the present invention, the continuity test signal transmitted from the continuity test device can be received by the same continuity test device through all communication channels due to the return loop set at the preceding station and the subsequent station. Since the paths are set in this way, there is an effect that continuity tests of a plurality of communication channels can be performed using one type of continuity test device and by sending out a continuity test signal once.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a relay switching system according to an embodiment of the present invention, FIG. 2 is a frame block diagram on a trunk line using a digital multiplex line in FIG. 1, and FIG. A configuration diagram showing an equivalent relay exchange system, Figure 4 is similar to Figure 3.
5 is a sequence diagram showing the signal sequence during the continuity test in FIG. 3, and FIG. 6 is a configuration diagram showing a relay exchange system using the conventional continuity test method. FIG. 7 is a state diagram showing paths during the continuity test in FIG. 6, and FIG. 8 is a sequence diagram showing the signal sequence during the continuity test. In the figure, 1a and 1b are trunk exchanges, 2 is a trunk line, and 3 is a trunk switch.
is a common line signal device, 4 is a common signal channel, 5 is a continuity test device, 6 is a frame, 7 a +7b to 7n are communication channels, and 8 is an equivalent communication channel. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] It has a multi-traffic connection function that uses digital multiplex lines for trunk lines between multiple trunk exchanges and allocates communication channels according to the transmission speed of calls on the trunk lines, and uses common line signals for the signaling system between the exchanges. In the continuity test method of a relay switching system in which the relay exchange system is used, a plurality of return loops for continuity testing are simultaneously set in the communication channel between the preceding station and the succeeding station of the relay exchange, and A continuity test signal output from a transmission port of a continuity test device connected to the test device passes through all the communication channels and loops, and is received at a reception port of the continuity test device to set a path. Continuity test method.