JPS62232224A - Loopback test method - Google Patents

Abstract

PURPOSE:To apply loopback test entirely independently of a terminal equipment by allowing a channel used for an opposite equipment to be tested to designate an equiment except the opposed equipment to apply loopback test. CONSTITUTION:A channel applying a loopback test of a bit multiplexer 3 does not send a reception signal to a terminal equipment 5 because the equipment number is an opposite station. In forming a loopback route 505 to a multiplex/ separation section 15, a data on an SYSX, CH1 is transferred onto a time slot of the SYSX, CH1, of a transmission time slot 504. The signal is sent to a reception time slot 502 of the bit multiplexer 1 and received by a time slot of the SYS1, CH1, but since the designated equipment number differs, the signal is not sent to the terminal equipment 4. Since the time slot 502 of the multiplex/separation section 14 in the CH 1 is detected as a signal when the signal is sent from the CH 1 of the time slot 501, the loopback test is executed entirely independently of the terminal equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a loopback test method in a communication system using a high-speed digital line.

[Conventional technology]

Conventionally, in this type of loopback test, as shown in FIG. 2, the signal from the terminal device 4 is bit multiplexed f! After being input to the low-speed interface section 111 at t1, it is supplied to the multiplexing/demultiplexing section 14. The multiplexing/demultiplexing unit 14 multiplexes the signals from the low-speed interface units 11z to 11n, converts the level of the signals, and sends the signals to the high-speed digital line 2. The multiplexing/separating section 15 of the bit multiplexing device 3 performs level conversion and separates and sends each signal to the low-speed interface sections 161 to 16n.The low-speed interface section then outputs the input signal to the terminal device 5.

In such a device, bit multiplexer 1 is assigned device number 1.
(sysl), and bit multiplexer 3 is device number 2 (s
yg2). FIG. 3 shows the contents of the time slots of the bit multiplexer 1, and the settings of the transmission time slot 301 in the time slot 201 of the bit multiplexer 1 are such that the data of the low speed channel/I/CH1 of the bit multiplexer 1 is 2 device number 2 low speed channel CHf
By connecting to 5YS2. Set as CHl. 4 to 3 in reception tie
02 connects the data from the low-speed channel CH1 of the bit multiplexer ii2 to the low-speed channel CH1 of the device number 1 of the bit multiplexer 1, so 5YS1. Set as CHl. Similarly, timeslot 20 of bit multiplexing e2
The setting content of the reception time slot 304 in 2 is 5Y.
S2. CHl and the setting contents of the transmission time slot 305 are 5YS1. Set it as C. With this setting, if data from this time slot low-speed channel is loaded, it becomes possible to communicate between bit multiplexers 1 and 2. Therefore, a loop test can be performed by carrying out the loop using the loop route 19 of the bit multiplex chain 3 or the loop route 20 at the low-speed interface section.

[Problem that the invention seeks to solve]

The original return test is a test that has nothing to do with the terminal device, so
Although it is desirable that the test signal not reach the terminal device, conventional methods cannot prevent this, and some terminal devices may malfunction due to the test signal.

[Means for Solving the Problem] In order to solve the above-mentioned drawbacks, the present invention provides that the channel used for the device that performs the test oppositely specifies a device other than the other device, and It was designed to be tested.

[For production]

The loopback test is performed without regard to the terminal device.

〔Example〕

FIG. 1 is an explanatory diagram when conducting a return trial sale to which the present invention is applied. In FIG. 1, in the receiving time slot 503 of the time slot 402 in the bit multiplexing device 3 and the transmitting time slot 504, the device number of the low-speed channel address CHI is set to a value of X other than the device number 2 of the bit multiplexing device 3. do. As a result, data from the low-speed channel CHI that has arrived on the transmission time slot 501 of the bit multiplexer 1 is provided on the 5YSX, CH1 time slot of the reception time slot 503 of the bit multiplexer 3. Since the channel on which the loopback test of the bit multiplexing device 3 is performed does not correspond to an opposing station, the reception key signal is not sent to the terminal device 5. Here, if a loop loop) 505Th is formed in the multiplexing/demultiplexing section 15, 5YS
The data carried on X, CHl is transferred to the 5YSX, CH1 time slot of the transmission time slot 504. This signal is transmitted to the receive time slot 502 of the bit multiplexer 1 and is transmitted to the 5YS1. Although the signal is received on time slot CI (1), since the designated device number is different, this signal is not sent to the terminal device 4.
In CH1 of 02, CH of evening f Ni slot 501
Since it can be detected as a signal if it is sent out from l, the loopback test can be performed regardless of the terminal device.

〔Effect of the invention〕

As explained above, the present invention has the advantage that the loopback test can be performed completely regardless of the terminal device because the loopback test is performed by specifying all devices other than the channel partner device used for the device forming the loopback loop. has.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a channel arrangement when channels are set by applying the present invention, FIG. 2 is a block diagram showing the configuration of the device, and FIG. 3 is a diagram showing a conventional channel arrangement. 1.3... Bit multiplexing device, 2... High speed digital line, 4.5... Terminal device, 111 to 11n,
161~16nφ/fist/low speed interface part, 14
,15...Multiplexing/separating section, 19,20゜505@
...Return route, 201, 202, 401, 40
2 Fist...Time slot, 301, 305, 501
, 504-... Transmission time slot, 302, 304
．． 502.503 Fist... Reception time slot.

Claims (1)

[Claims] A communication system in which there is a plurality of multiplex devices, each of which is installed at a separate location to form a communication system, and each device can specify and communicate with any device for each channel,
A loopback test method in which a loopback test is performed by forming a loopback loop, characterized in that the channel used for the device forming the loopback loop designates a device other than the partner device for the loopback test.