JPH06132856A - High-frequency line diagnostic system - Google Patents

Abstract

PURPOSE:To shorten time required for diagnosing all the channels by effectively using all the circuits by always using all the plural error detectors on the reception side regardless of the number of counter stations. CONSTITUTION:On the reception side, signal 12 to 15 from the counter stations are inputted to a signal extraction circuit 10, and test pattern signals for 4 channels are extracted from the signals 12 to 15. The extracted pattern signals are outputted respectively to four error detectors 11 for each channel. The detector 11 collates whether there is any error in this test pattern signal or not, diagnoses whether a line is normal or not, and outputs a diagnosed result 16 for each channel. The number of channels for test pattern signals in the input signals to the circuit 10 is always correspondent to the number of channels regardless of the number of counter stations. Therefore, the test pattern signals to be inputted to the reception side are always set for 4 channels, and the four error detectors 11 are used at all times. Accordingly, all the channels can be diagnosed in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly efficient line diagnostic system for use in a highly efficient digital multiplexer.

[0002]

2. Description of the Related Art A high-efficiency digital multiplexing apparatus is an apparatus for identifying a voiced portion and a silent portion of a voice signal, and compressing and transmitting only the voiced portion. Such a high-efficiency digital multiplexer is usually provided with a line diagnostic function for diagnosing a line failure and voice quality, and a test reception having a specific pattern on an empty channel in the line is performed. , It is judged whether the correct signal can be restored in the opposite station.

Conventionally, in this type of line diagnostic system, as shown in FIG. 2A, a signal generator 1 for outputting a test pattern signal in response to an input start signal 4 and a signal generator 1 are provided. A distributor 2 for distributing the test pattern signal from 4 to 4 and one output of the distributor 2 is a channel in the line signal 5 in which a plurality of channels from the line connected to the exchange are time-division multiplexed. 2 of FIG. 2B is provided on the receiving side.
As shown in, signals 12 to 15 coming from the transmitting side of the opposite station
Error detector 8 for detecting an error in the test pattern signal in
It has four.

In the transmitting side block, when the start signal 4 for instructing the test start is input to the signal generator 1, the signal generator 1 outputs the test pattern signal to the distributor 2. Distributor 2 has a setting information indicating whether to distribute the signal to advance any other station, and outputs an input signal in accordance with the setting information to the multiplexing circuit 17. Multiplex circuit 17
Then, the signal input from the distributor 2 is inserted into one of the unused channels of the line signal 5 and multiplexed, and the multiplexed signal is sent to the opposite station indicated by the above-mentioned setting information.

In the receiving side block, the multiplexed signals 12 to 15 output from the transmitting side of the opposite station are input to the error detector 8 on the receiving side of the own station through the transmission path. The error detector 8 extracts a test pattern signal from each input signal,
By checking whether there is an error in this test pattern, it is diagnosed whether the line is in a normal state,
The diagnosis result 16 is output for each opposite station.

In this way, the idle channels of the line signal are diagnosed one by one at regular intervals, and finally all the channels are diagnosed.

[0007]

In this conventional line diagnostic method, when the number of opposite stations is 4, all four error detectors 18 are used. For example, when there is only one opposite station,
Only the error detectors 18 are used, the remaining three error detectors 18 are not used, the total number of circuits is not effectively used, and the unused channels are diagnosed one by one. As a result, it takes a long time to finish diagnosing all the channels of the line signal.

[0008]

According to the line diagnostic method of the present invention, a test pattern signal generated at the time of a test is inserted into an empty channel in a line signal in which a plurality of channels are time-division-multiplexed and multiplexed on a transmission side. The test pattern signal is extracted from the signals sent from the multiplex circuit on the transmitting side of the opposite station at the time of testing to the receiving side to check whether there is an error or not. In the line diagnosis system including a plurality of error detectors for detecting, in the multiplexing circuit on the transmitting side, the test patterns are provided on the empty channels for the number of channels which is equal to the number of the error detectors of the opposite station in total. The signals are simultaneously multiplexed, and the receiving side opposite thereto extracts the test pattern signals for the number of channels equal to the number of the error detectors of its own station and extracts each channel. Each is sent to the error detector to a separatory be characterized in that to detect the presence or absence of an error.

[0009]

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

1A and 1B are block diagrams of a transmitting side and a receiving side according to an embodiment of the present invention. Figure 1 (a)
On the transmitting side, the start signal 4 is input to the signal generator 1 so that the signal generator 1 outputs a test pattern signal for line diagnosis to the distributor 2. The distributor 2 is
The output of the signal generator 1 is distributed to four and four multiplex circuits 3
Output to each. In the multiplex circuit 3, each output signal of the distributor 2 is inserted into a vacant channel in the line signal 5 connected to the exchange to be multiplexed, and signals 6 to 9 are transmitted to the opposite station.
Are sent respectively.

The number of opposite stations is determined by the setting information held in the distributor 2 in advance, and in the present embodiment, up to four stations can be opposed. When the number of opposite stations is only one, one multiplexer circuit 3 connected to the opposite station among the four multiplexer circuits 3 is used. In the multiplex circuit 3 connected to the opposite station, the line signal 5 connected to the exchange
The output signal from the distributor 2 is distributed and inserted into four of the empty channels among the two, multiplexed, and transmitted to the opposite station. The remaining three multiplexing circuits 3 are not used. In case of two opposite stations,
Two multiplexer circuits 3 connected to the opposite station are used. In these two multiplexer circuits 3, the test pattern signals from the signal generator 1 are summed up and used in the line signal 5 for 4 channels. It is inserted into a channel that has not been set up, multiplexed and sent to the opposite station. The remaining two multiplexing circuits 3 are not used. When the number of opposite stations is three, three multiplexing circuits 3 connected to the opposite station are used, and the three multiplexing circuits 3 are used.
Then, a total of four test pattern signals from the signal generator 1 are inserted into the vacant channels in the line signal, multiplexed, and transmitted to the opposite station. The remaining one multiplexing circuit is not used. If there are four opposite stations, all four multiplexing circuits 3 are used. In each multiplexing circuit 3, the output signal of the distributor 2 is inserted into an empty channel in the signal 5 of the line and multiplexed. Send to the opposite station. As described above, from the transmitting side, no matter how many opposite stations
In total, the line signal in which the test pattern signal is multiplexed is output to the four vacant channels.

On the receiving side in FIG. 1B, the signals 12 to 15 sent from the opposite station are input to the signal extraction circuit 10. The signal extraction circuit 10 extracts a test pattern signal for four channels from the signals 12 to 15. The test pattern signal extracted by the signal extraction circuit 10 is output to each of the four error detectors 11 for each channel. The error detector 11 determines whether or not the line is in a normal state by checking whether or not the test pattern signal has an error, and outputs the shaking result 16 for each channel. .

As described above, the number of channels of the test pattern signal in the signal input to the signal extraction circuit 10 is always the number of channels, regardless of the number of opposite stations. Therefore, the test pattern signal input to the receiving side is the same. Is always set to 4 channels, and four error detectors 11 are always used. For example, if there is one opposite station, 4
The line is diagnosed for each channel, and when there are two opposite stations, the line is diagnosed for each two channels.

[0014]

As described above, according to the present invention, the total number of circuits can be effectively used by always using all the plurality of error detectors on the receiving side regardless of the number of opposite stations. In addition, when the number of opposite stations is small, it is possible to diagnose all channels more quickly than the conventional method by simultaneously performing diagnosis for a plurality of channels.

[Brief description of drawings]

1A and 1B are block diagrams of a transmission side and a reception side according to an embodiment of the present invention.

2A and 2B are block diagrams of a transmitting side and a receiving side of a conventional method.

[Explanation of symbols]

 1 Signal Generator 2 Distributor 3,17 Multiplexing Circuit 4 Start Signal 5 Line Signal 10 Signal Extraction Circuit 11,18 Error Detector 16 Diagnostic Results

Claims (1)

[Claims] 1. A receiving side is provided with a plurality of multiplexing circuits for inserting and multiplexing a test pattern signal generated at the time of a test into an empty channel in a line signal in which a plurality of channels are time division multiplexed, and receiving. On the side, a line having a plurality of error detectors for detecting the presence or absence of an error by extracting the test pattern signal from the signal sent from the multiplexing circuit on the transmitting side of the opposite station at the time of a test In the diagnostic method, in the multiplexing circuit on the transmission side, the test pattern signals are simultaneously multiplexed on the empty channels for the number of channels which is equal to the total number of the error detectors of the opposite station,
At the receiving side opposite to this, the test pattern signals for the number of channels equal to the number of the error detectors of the local station are extracted and sent to the error detector for each channel to detect the presence or absence of each error. High-efficiency line diagnostic method characterized by.