JPH03245649A - Isdn remote subscriber line test system - Google Patents

Abstract

PURPOSE:To measure a bit error rate of a subscriber line at a remote location accurately and economically by connecting a bit error rate measuring equipment and an ISDN subscriber line accommodated in a remote subscriber line accommodation equipment via a channel bus in an ISDN exchange and measuring a bit error rate of a subscriber line. CONSTITUTION:When a call is requested from a subscriber line test terminal equipment 15 in an ISDN exchange 8 to a tested subscriber, a central controller 11 connects the subscriber line test terminal equipment 15 to a bit error rate measuring equipment 14 in a remote ISDN subscriber line accommodation device 1 accommodating the subscriber line test terminal equipment 15 and the tested subscriber. The central controller 11 informs the end of setting of the loopback mode and the bus connection between the bit error rate measuring equipment 14 and the tested subscriber line to the subscriber line test terminal equipment 15 by using a predetermined control signal to allow the bit error rate measuring equipment 14 to start the measuring of the bit error rate. After measuring the bit error rate, the bit error rate measuring equipment 14 informs the result to the subscriber line test terminal equipment 15. After the reception of the result of measurement of the bit error rate, the subscriber line test terminal equipment 15 interrupts the call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ISDN subscriber line testing system accommodated in a remote location, and more particularly to bit error rate measurement of a remote subscriber line.

[Conventional technology]

Conventionally, this type of test system, as shown in Figure 2,
Test lead-in relay contacts 6a, 6b connect the network termination devices i2a, 2b in the subscriber premises accommodated in the remote subscriber line accommodation device 1.
Dedicated line 1 separate from the transmission line where subscriber lines are multiplexed via
3, it was connected to the bit error rate measuring device 12 as a test device on the ISDN exchange 8 side. In Fig. 2, 3.10 is a multiplex transmission line interface, 4 is a demultiplexing circuit, and 5a and 5b are rsD.
N subscriber termination circuit, 7 is a multiplexed transmission line of 1.5 Mbps, 2 Mbps, etc. (hereinafter referred to as "multiplexed transmission line")
, 9 is a communication path, and 11 is a central control unit.

[Problem to be solved by the invention]

The conventional ISDN remote subscriber line test system described above is
If the distance between the ISDN exchange 8 and the remote subscriber line accommodation equipment 1 is long, the network termination equipment iJa, 2b in the remote subscriber's premises
Layer 1 of the test equipment 12 cannot be synchronized, and not only is it impossible to measure the bit error rate, but even if it were possible to measure the bit error rate, it would require a dedicated line 13 for testing. There were drawbacks.

[Means to solve the problem]

In order to eliminate such drawbacks, the present invention includes a focus error rate measuring device connected to a remote subscriber line accommodation device,
The bit error rate of the subscriber line is measured by connecting this bit error rate measuring device to the ISDN subscriber line accommodated in the remote subscriber line accommodation device via a communication channel path within the ISDN exchange. It is something.

[Effect]

In the ISDN remote subscriber line testing system according to the present invention, the bit error rate of a subscriber line at a remote location can be measured accurately and economically.

〔Example〕

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

FIG. 1 is a system diagram showing an embodiment of an ISDN remote subscriber line testing system according to the present invention. In the same figure, the second
Parts that are the same as or equivalent to those in the diagram are given the same reference numerals.
2 is a network termination device, 14 is a bit error rate measuring device, and 15 is a subscriber line test terminal.

The remote ISDN subscriber line accommodation equipment W1 is composed of a multiplex transmission line interface 3, a demultiplexer circuit 4, an ISDN subscriber termination circuit 5a, 5b, and a via error rate measuring device 14. The transmission signal is sent to ISDN by the demultiplexing circuit 4.
The signals are demultiplexed onto a multiplex transmission path 7 to an exchange 8. Remote I
The multiplex transmission line interface 3 in the SDN subscriber line accommodation device 1 connects to the ISDN exchange 8 via the multiplex transmission line 7.
It is connected to the multiplex transmission line interface 10 within. In addition to the multiplex transmission line interface 10, the ISDN exchange 8 includes a communication line path 9, a central control unit 11, and a subscriber line test terminal 15.

Next, a method for measuring the bit error rate of the subscriber line between the network termination device 2 and the ISDN subscriber termination circuit 5a will be explained. A call request is made from the subscriber line test terminal 15 in the ISDN exchange 8 to the subscriber under test. Subscriber line test terminal 15
When there is a call request from
It is connected to the bit error rate measuring device 14 in the N subscriber line accommodation device 1. The bit error rate measuring device 14 is connected to the ISDN subscriber termination circuit 5b. In other words, since the bit error rate measuring device 14 is accommodated in the remote ISDN subscriber line accommodation device 1 with a 2B+D ISDN basic interface, one channel is connected to the subscriber line test terminal 15, and the other channel is connected to the other channel. It is possible to connect.

Therefore, the central control unit 11 also connects the subscriber line under test and the bit error rate measuring device 14 via the communication path 9 at the same time. At this time, the central controller 11 uses a predetermined control signal to request the ISDN subscriber termination circuit 5a to set the return mode of B1 or B2 in the network termination bag f2. Here, the network termination device 2 sets the return mode of the designated channel B1 or B2 under control from the ISDN subscriber termination circuit 5a.

Central control unit! fil notifies the subscriber line test terminal 15 of the completion of the connection of the path between the focus error rate measuring device 14 and the subscriber line under test and the setting of the return mode using a predetermined control signal. Then subscriber line test terminal 1
Step 5 causes the bit error rate measuring device 14 to start measuring the bit error rate.

After measuring the bit error rate, the bit error rate measuring device 14 measures the bit error rate.
The result is notified to the subscriber line test terminal 15. After receiving the measurement result of the bit error rate, the subscriber line test terminal 15 disconnects the call.

The central control device 11 requests the ISDN subscriber termination circuit 5a to release the loop back, and also requests the bit error rate measuring device 11
4 and the subscriber line under test, and the path between the bit error rate measuring device 14 and the subscriber line test terminal 15 is also disconnected.

In this way, measurements of the bit error rate of ISDN remote subscriber lines can be made.

〔Effect of the invention〕

As explained above, the present invention includes a bit error rate measuring device connected to a remote subscriber line accommodation device, and an IS
The bit error rate of the subscriber line is measured by connecting the DN subscriber line through the communication path within the ISDN exchange, which makes it possible to measure the bit error rate of the subscriber line at a remote location. It is effective and can be done accurately and economically. Another advantage is that the bit error rate can be measured without interrupting subscriber service.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the ISDN remote subscriber line testing system according to the present invention, and FIG. 2 is a system diagram showing a conventional ISDN
1 is a system diagram showing a remote subscriber line test system. DESCRIPTION OF SYMBOLS 1... Remote ISDN subscriber line accommodation device, 2... Network termination device, 3, 10... Multiplex transmission line interface, 4... Demultiplexing circuit, 5a, 5b... ISDN subscriber Terminal circuit, 6a, 6b... Test lead-in relay contact, 7... Multiplexed transmission line, 8... I SDN exchange, 9... Call path, 10... Multiplexed transmission line interface, 11...Central control unit, 14...Bit error main measuring device, 15...Subscriber line test terminal. L----J diagram

Claims (1)

[Claims] ISDN that has an ISDN exchange that accommodates remote subscriber line accommodation equipment that accommodates ISDN subscriber lines in remote locations via multiplexed transmission paths such as 1.5 Mbps, 2 Mbps, etc.
A remote subscriber line testing system includes a bit error rate measuring device connected to the remote subscriber line accommodating device, and the bit error rate measuring device and the ISDN subscriber line accommodated in the remote subscriber line accommodating device. An ISDN remote subscriber line test system for measuring the bit error rate of a subscriber line by connecting the above-mentioned ISDN via a speech path within the ISDN exchange.