JPH05276247A - Primary access line test system - Google Patents

Abstract

PURPOSE:To test layer 3 or higher levels in a primary access line test system conventionally provided with a test means only effective for the layer 1 and the layer 2. CONSTITUTION:A call origination test terminal TE 202 is installed for a private branch exchange 201 stored through a primary access line 301, and the TE 202 is controlled by a subscriber exchange 101 to perform the test. At this time, the monitoring device MON 107 of the subscriber exchange 101 monitors B and D channels of the primary access line 301. When abnormality is found by this monitoring result, it is reported to a maintenance test terminal MAT 114 to be analyzed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary access line test system, and more particularly to an ISDN primary rate
The present invention relates to a primary access line test method for testing an access subscriber line.

[0002]

2. Description of the Related Art Conventionally, this type of ISDN primary
Testing of rate access subscribers was done separately for the primary access line and the private branch exchange, and there was no way to do a comprehensive test that integrated them.

[0003]

In this conventional test method, when a call from the private branch exchange is difficult to reach when testing the primary interface subscriber, the private branch exchange and the line are separately tested. Is limited to bit error tests, hardware continuity tests, path setting tests, etc., and call test functions cannot be fully tested. For this reason, there is a drawback that it is difficult to detect the problem if there is no failure in each hardware. In particular,
In recent high-performance exchanges, not only hardware-related factors but also software-related operational mistakes often occur. Nevertheless, in the conventional test as described above, if the call is difficult to reach due to software-related factors such as subscriber data error and system data error, it is difficult to detect the fault before the fault is isolated. there were.

[0004]

A primary access line test system of the present invention comprises a private branch exchange accommodating an ISDN subscriber or an analog subscriber and a subscriber exchange connected to the private branch exchange by a primary access line. The subscriber switching system sends D on the primary access line when a test call is issued from the test calling terminal of the private branch exchange.
Test means is provided for monitoring a channel to test the normality of the private branch exchange and the primary access line.

The subscriber exchange controls the test calling terminal via the primary access line, and the test means monitors the D channel to check the signal content on the D channel. Analyzing and monitoring any B channel on the primary access line to confirm that the B channel designated in the D channel is used.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the primary access line test system of the present invention.

In FIG. 1, this embodiment comprises a subscriber exchange 101 of a public ISDN network, and a private branch exchange 201 accommodated in the subscriber exchange 101 via a primary access line 301. Line interface circuit (hereinafter referred to as INF) 103 on the side of the subscriber exchange 101, private branch exchange 20
The INF 203 on the first side is a line terminating device (hereinafter LT) 10
4. A network terminating device (hereinafter referred to as NT) 204 is connected to each primary access line 301.

The private branch exchange 201 responds to connection requests from telephone terminals 205 and data terminals 206 accommodated by the subscriber interfaces 208 and 209, respectively.
Then, connection control is performed via the D channel on the primary access line 301, and the user connects the call to the desired connection destination. The subscriber interfaces 208 and 209 of the private branch exchange 201 are not necessarily ISDN standard interfaces. Generally, a dedicated interface may be used depending on the type of the private branch exchange, or a dedicated interface and an ISDN interface may be mixed. There are also cases. Of course, it may be a conventional telephone interface. The above D channel is 1
One channel may be prepared for one primary line, or one channel may be prepared for a plurality of primary access lines set up between one private branch exchange and subscriber exchange.

The primary access line is generally 23B + D or 24B depending on the bit rate used.
, And 30B + D, both of which include a low-speed data link for the purpose of maintenance apart from the communication path or D channel.

Next, the operation of this embodiment will be described.
In the case of testing the primary access line 301 in this embodiment, first, the test is activated by a notification from a subscriber or the like, or the exchange periodically. In the former case, the test is started from the maintenance terminal (hereinafter referred to as MAT) 114 of the exchange, and in the latter case, the central control unit (hereinafter referred to as CC) 102 of the exchange.
Be done from. Since the CC 102 is not a main constituent requirement of this embodiment, detailed description thereof is omitted, but the CC 102 may be a single processor system or a multiprocessor system. When the functions are distributed by the multiprocessor method, the test is started by activating the maintenance operation processor that controls the maintenance operation function.

In this embodiment, the case where the MAT 114 is started up will be described. The test instruction activated from the MAT 114 is transmitted to the CC 102 via the system bus 108. The CC 102 issues a test instruction for the designated primary access line 301 to the test control device (TC) 106.
At the same time, the communication channels 111 and 112 for control are set between the TC 106 and the INF 103 accommodating the corresponding primary access line 301. The INF 103 knows, through the communication paths 111 and 112, the primary line and channel accommodated by itself and what kind of test is to be performed.

When it is recognized that the test instruction is an outgoing test from the private branch exchange 201 accommodated in itself, the LT 104, the primary access line 301, and NT.
204, private branch exchange 2 via low-speed data link 207
The outgoing test terminal (hereinafter TE) 202 accommodated in 01
The test execution instruction is sent to. Data link 207 is NT
At 204, it is separated from the primary access line 301 and connected to the TE 202. Private branch exchange 201
Has a designated connection function so that the TE 202 can receive information on which channel on the primary access line 301 is used to set up a call.

In response to a connection request from the TE 202, the private branch exchange 201 executes control for a series of call setup such as a connection request signal message to the subscriber exchange 101 via the D channel on the primary access line 301. As a result, if there is no problem in the above connection control process, the subscriber exchange 101 performs call processing without making a distinction from the call originating from the normal primary access line, and the call origination test trunk (TT).
The test succeeds by arriving at 105 and connecting the CC 102 with the corresponding time slot of the communication path connected to the INF 103 and the TT 105 through the communication paths 109 and 110. When the test is unsuccessful, the D channel on the primary access line 301 is connected to the monitor device (hereinafter referred to as MON) 107 via the communication path 109 to determine where the abnormality occurs, and the TE202 is connected. The signal message on the D channel after the connection instruction to the TE is monitored, the B channel to be used in this test call is drawn into the MON 107 via the communication path 109, and a pseudo preset with the TE 202 is set. Confirm that the communication path is correctly selected by sending and receiving a random pattern. The monitoring result by the MON 107 is sent to the MAT 114 by the data link 113 so that the maintenance person can know at which stage the test has failed.

[0014]

As described above, according to the present invention, the hardware normality test, in other words, the test of the primary access line, which has been limited to the test of layer 1 and layer 2, is performed in the call processing of layer 3 and above. It has the effect that it can be implemented up to the level of actual operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a primary access line test system of the present invention.

[Explanation of symbols]

 101 subscriber exchange 102 central control unit (CC) 103, 203 line interface circuit (INF) 104 line terminating device (LT) 105 test trunk 106 test control unit (TC) 107 monitor unit (MON) 108 system bus 109, 112 Call path 113,207 Data link 114 Maintenance test terminal (MAT) 201 Private branch exchange 202 Call origination test terminal (TE) 204 Network terminating equipment (NT) 205 Telephone terminal 206 Data terminal 208,209 Subscriber interface 301 Primary access line

Claims (3)

[Claims] 1. A private branch exchange for accommodating an ISDN subscriber or an analog subscriber, and a subscriber exchange connected to the private branch exchange by a primary access line. The subscriber exchange is tested from a test calling terminal of the private branch exchange. A primary access line test method comprising: a test means for monitoring the D channel on the primary access line when a call is generated to test the normality of the private branch exchange and the primary access line. 2. The primary access line test system according to claim 1, wherein the subscriber exchange controls the test calling terminal via the primary access line. 3. The test means monitors the D channel to analyze the signal content on the D channel, and monitors an arbitrary B channel on the primary access line to specify a B channel designated in the D channel. 2. It is confirmed that is used.
Or the primary access line test method described in 2.