JP3110074B2 - Remote test method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote test system for performing a test by remotely controlling a digital line terminal used in an ISDN system, and more particularly to a remote test system in which a user voluntarily performs a test.

[0002]

2. Description of the Related Art In a conventional remote test system in which a digital line termination device used in an ISDN system is remotely controlled to perform a test, remote control is performed from an ISDN network.

[0003]

A digital line terminating device used in an ISDN system is provided by a first-class telecommunications carrier (eg, Nippon Telegraph and Telephone Corporation) as a terminating device for line facilities in digital services. Therefore, there was no need for maintenance by the user. Therefore,
As a remote test method, the first-class telecommunications carrier
The test was performed by remote control from the SDN network.

[0004] However, since November 1, 1991, a digital line termination device can be installed by a user himself as terminal equipment or the like, not as part of the line equipment. For this reason, a remote test method that can be independently performed by a user is required as a maintenance method. When a user voluntarily performs a remote test, it is necessary to distinguish an REC alarm or the like generated by the remote test from an original alarm generated by a failure so as not to be generated on the ISDN network side.

[0005] Accordingly, it is an object of the present invention to provide a remote test system which can be independently performed by a user.

Another object of the present invention is to provide a remote test system in which a REC alarm or the like generated by a remote test is distinguished from an original alarm generated by a failure so as not to be generated on the ISDN network side. is there.

[0007]

According to the present invention, a first digital line terminal includes a loop control information detecting circuit for detecting loop control information from a received signal received from an ISDN network, A loop circuit that operates under the control of the detection circuit and returns data to be transmitted to the first terminal device to the ISDN network; and an alarm control information transmission circuit that transmits alarm control information to the ISDN network under the control of the loop control information detection circuit. The ISDN network includes an alarm control information receiving circuit that receives the alarm control information sent from the first digital line termination device, and an alarm issuance in the ISDN network controlled by the alarm control receiving circuit. Means for stopping, and either one of the second digital line termination device and the second terminal device connected via the ISDN network. Test data transmitted by transmitting loop control information and test data, and the test data looped back by the first digital line termination device is transmitted by one of the second digital line termination device and the second terminal device. And a remote test method characterized by comparing with

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

Referring to FIG. 1, in one embodiment of the present invention, a first terminal device 20 is connected to an ISDN network 30 via a first digital line termination device 10.
Further, a second terminal device 21 is connected to the ISDN network 30 via the second digital line termination device 11.

A case where a remote test is performed from the second terminal device 21 will be described. In the remote test method according to the present embodiment, the state shifts from the normal communication state to the remote test state, and returns to the normal communication state again after the end of the remote test.

First, the second terminal device 21 uses the user channel to transmit loop control information indicating the start of a loop test from the loop control information transmission and test data transmission circuit 22. First digital line termination device 10
When the loop control information from the second terminal device 21 is detected by the loop control information detecting circuit 1, the alarm control information transmitting circuit 2 is operated before the loop circuit 3 is operated in the loopback state, and the ISDN network 30 , The alarm control information is transmitted using an overhead channel allocated separately from the user channel. ISDN network 30
When the alarm control information receiving circuit 31 receives the alarm control information indicating the start of the loop test, the alarm control unit 32 controls the alarm issuing unit 32 to stop and issue the alarm.

The alarm control information receiving circuit 31 does not release the control for stopping the alarm issuance to the alarm issuance section 32 until the alarm control information indicating the end of the loop test is received. The first digital line terminating device 10 includes an alarm control information sending circuit 2
Is controlled, the loop circuit 3 is operated in the loopback state.

Next, the second terminal device 21 sends test data from the loop control information sending circuit and the test data sending circuit 22 using a user channel. This test data is transmitted to the digital line termination device 11 and the ISDN 3
After passing through 0, the loop is looped back by the digital line termination device 10 and returns to the second terminal device 21. The second terminal device 21 receives the test data at the test data receiving unit 23 and compares the test data transmitted at the transmission / reception test data comparison unit 24.

Finally, the recovery procedure will be described. First, the second terminal device 21 uses the user channel from the loop control information transmission and test data transmission circuit 22 to
The loop control information indicating the end of the loop test is transmitted.
The first digital line termination device 10 receives the loop control information from the second terminal device 21 by using the loop control information detection circuit 1.
, The loop circuit 3 is controlled to release the loop-back state before the alarm control information sending circuit 2 is controlled. After releasing the loopback state, the loop control information detection circuit 1 controls the alarm control information detection circuit 2 and
The alarm control information is transmitted to the network 30 using an overhead channel allocated separately from the user channel. The ISDN network 30 is an alarm control receiving circuit 31,
The alarm control information indicating the end of the loop test is received, and the control to stop the alarm issuance of the alarm issuance unit 32 is released.

[0015]

As described above, according to the present invention, an alarm generated in connection with a remote test is prevented from being issued on the ISDN network, and a user channel is used for transmitting loop control information and test data. Since the control information is transmitted using the overhead channel allocated separately from the user channel, the user can voluntarily remotely test the digital line terminal installed by himself / herself.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loop control information detection circuit 2 Alarm control information sending circuit 3 Loop circuit 4 Signal processing circuit 10 First digital line termination device 11 Second digital line termination device 20 First terminal device 21 Second terminal device 22 Loop control Information sending and test data sending circuit 23 Test data receiving unit 24 Transmission / reception test data comparing unit 25 Signal processing unit 30 ISDN network 31 Alarm control information receiving circuit 32 Alarm issuing unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/26 H04L 29/14 H04M 11/00 301

Claims (3)

(57) [Claims] In a remote test method for remotely controlling and testing a digital line terminal used in an ISDN system, a first digital line terminal receives loop control information from a received signal received from an ISDN network. A loop control information detecting circuit for detecting, a loop circuit which operates under the control of the loop control information detecting circuit and returns data to be transmitted to the first terminal device to the ISDN network, and a loop circuit for controlling the loop control information detecting circuit to the ISDN network An alarm control information transmission circuit for transmitting alarm control information,
The ISDN network includes an alarm control information receiving circuit that receives the alarm control information sent from the first digital line termination device, and stops issuing an alarm in the ISDN network under the control of the alarm control receiving circuit. Means for transmitting loop control information and test data from one of the second digital line termination device and the second terminal device connected via the ISDN network. Test data looped back,
A remote test method, wherein the test data is compared with test data transmitted from one of the second digital line termination device and the second terminal device. 2. The ISDN network receives the alarm control information sent from the first digital line terminal, and stops issuing an alarm generated in a loop test detected by the ISDN network. The remote test method according to claim 1, wherein: 3. A user channel is used for transmitting loop control information and test data, and an overhead channel allocated separately from the user channel is used for transmitting alarm control information to be transmitted to the ISDN network. 3. The remote test method according to claim 1, wherein: