JPS59219044A - Self-test method of pcm terminal station device - Google Patents

Abstract

PURPOSE:To attain efficient path test and fault retrieval by inserting a 0 dbmO digital pattern of the standard level diagram from a 64kb/s data section and reflecting simultaneously sound input/output points and input/output points of a PCM line. CONSTITUTION:An external access operation function 12 and functions 1, 11 reflecting simultaneously input/output points of sound side of each channel and input/output points of a PCM side line are provided, a digital signal separating function 5 of sound in the unit of channel is provided to the input side of a multiplex function 6 and a digital signal detecting function 10 is connected. An output of a separating function 7 is provided with a digital signal inserting function 8 and the 0 dbmO digital pattern of the standard level diagram is inserted. The test whether or not a fault exists in functions of the multiplex function 6 and the separating function 7 being a common section and the test of each channel bus are conducted at the same time.

Description

Detailed Description of the Invention (a) 2 Technical Field of the Invention The present invention relates to a self-testing method for PCM terminal equipment, and in particular, it simultaneously performs a fault search for each channel path and the multiplexing/demultiplexing function that is a common part. This paper relates to a self-test method for pcM terminal equipment.

(b), Prior Art and Problems According to the prior art, when performing a self-test in the channel bank of a PCM brothel device, the transmission of the PCM side line,
The reception is looped back to the local station, the audio signal is inserted from the audio signal input terminal, and the signal output to the audio output terminal of the corresponding channel is measured.Such tests are conducted for each channel in turn, and the measurement results are as follows. The problem was that the exam was very complicated, since it was used to search for disabilities.

(C)0Object of the invention The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
64Kb/s which is digital information of each channel signal
Insert the OdbmO digital pattern of standard level Gui-1 from the data section, and insert the audio input/output point and PC.
To provide a self-testing system for a PCM terminal equipment that simultaneously and efficiently performs each channel path test and a failure search in a common section by simultaneously turning back the human output points of the M side line.

(d)0 Structure of the Invention According to the present invention, the above object is to control the external access operation function, the audio side input/output point of each channel, and the human output point of the PCM side line in the self-test of the PCM terminal equipment. A simultaneous loopback function is provided, a channel-by-channel audio digital signal separation function is provided on the input side of the multiplex function, a digital signal detection function is connected, and a digital signal insertion function is provided at the output of the separation function to output the standard level diamond OdbmO. By inserting a digital pattern and operating the external access operation function, a test of each channel path and a test of whether or not there is a failure in the function of the multiplexing/separating function, which is a common part, are carried out at the same time. This is achieved by providing a self-test method for PCM terminal equipment that is characterized by the following features:

(e) 3 Embodiments of the Invention The present invention provides a channel bank using a channel-based A/D and D/A converter (hereinafter referred to as C0DEC), an audio signal transmission/reception loop function for each channel, and a PC.
A transmit/receive loopback function for the M side line, a digital signal loopback function for each channel, and an Odbm○ digital pattern generator are provided, and a relatively simple access means from the outside allows for quick self-transmission of each channel. This will enable testing and functional disorder searches.

The figure is a configuration diagram of a channel bank showing one embodiment of the present invention.

In the figure, 1 is the loopback function on the audio side, 2 to 4 are the single channel C0DEC (2 is the first channel C0DEC,
3 is the CODEC of the second channel (14 is the C0DEC of the nth channel), 5 is the audio digital signal separation function in channel units, 6 is the multiplexing function which is the common part, 7 is the separation function which is the common part, and 8 is the separation function in the channel unit. Audio digital signal insertion function; 9 is an OdbmO digital pattern generator that generates a standard level diamond signal; 10;
1 is a digital signal detection function, 11 is a loopback function on the PCM line side, and 12 is an external access function for executing a self test.

The present invention will be described in detail below with reference to the drawings.

When carrying out a self-test of the PCM terminal equipment, first, the access command information for self-test is sent from the external access function 12 to the audio loopback function 1, the audio digital signal separation function 5 for each channel, and the digital signal separation function 5 for each channel. It is sent to the audio digital signal insertion function 8.

The callback function 1 on the audio side is the self-test access/
Receive command information and connect the audio output of that channel to the audio input.

An audio digital signal separation function 5 for each channel receives the self-test access command information and connects a digital signal detection function 10 as a branch.

The channel-by-channel audio digital signal insertion function 8 receives the self-test access command information and outputs the Od
bmO digital pattern generator 9 is inserted and connected.

Note that when the OdbmO digital pattern generator 9 inserts a standard level diamond signal into the channel, the input point of the multiplex function 6 which is a common part or the common part [function 7
is an oscillator that generates the same pattern that occurs at the output point of the oscillator.

In the figure, as a result of receiving the self-test access command information, the connections of various parts are changed as shown by dotted lines.

In the case of north-south, a circuit failure in the common part is considered, and the clock generator required to operate the separation function 7, which is the common part on the receiving side, is switched to the clock generator operating the transmitting side.

Furthermore, by providing control i-command information (CHI to CHn) for selecting channels from the external access function 12, each channel path test can be executed semi-automatically.

Furthermore, the external access function 12 provides access for self-testing.
The command information is sent to the loopback function 11 on the PCM line side, and the loopback function 11 on the PCM line side receives the self-test access command information and puts the PCM line side in the loopback state.

By putting the example PCM line in a folded state like this, it is possible to search for faults in the common part by detecting various alarms such as input disconnection, frame loss, errors, etc. in the common part on the receiving side. becomes. It is also possible to connect the digital signal detection function 10 to the output end of the receiving side common section and measure its level.

(f) 1. Effects of the Invention As explained in detail above, according to the present invention, each channel/bus test and fault search in the common part can be performed simultaneously and efficiently (
This has the great effect of realizing a self-test method for PCM terminal equipment.

[Brief explanation of drawings]

The figure is a configuration diagram of a channel bank showing one embodiment of the present invention. In the figure, 1 is the loopback function on the audio side, 2 to 4 are the single channel C0DEC (2 is the first channel GODEC1
3 is the CODEC of the second channel (14 is the CODEC of the nth channel), 5 is the Mu NA function for the digital signal of the audio of the channel, 6G is the multiplex function which is the common part, 7 is the R function which is the common part, 8 9 is the standard level audio digital ray word-insertion function for each channel.
Tie 4. Emit the A word of η2. This is an external access function that allows one child to access eight generations.

Claims (1)

[Claims] )) In the self-test of the CM terminal equipment, an external access operation function, a function to simultaneously loop back the audio side input/output point of each channel and the input/output point of the PCM side line are provided, and the input side of the multiplex function is A digital signal separation function for audio is provided, a digital signal detection function is connected, a digital signal insertion function is provided at the output of the separation function, and a standard level diamond OdbmO digital pattern is inserted.
By operating the external access operation function, it is possible to simultaneously test each channel/path and test whether or not there is a failure in the function of the multiplex function/separate function, which is a common part. Self-test method for PCM terminal equipment.