JPS62185433A - Line connection supervisory control system - Google Patents

Abstract

PURPOSE:To supervise a line fault after line connection by sending an in-channel control signal subjected to envelope by a data signal and an in-channel control signal while being coded into a prescribed pattern corresponding to a line control signal so as to eliminate the need for the addition of a check bit. CONSTITUTION:A line 8 is connected to a channel subjected to time division multiplex by a time division switch section 6 via a line interface section 7 and the channel and the line interface section 7 are connected by the time division switch section 6 via the transmission section 4b of other terminal equipment 2 and a trunk line 3. An in-line control signal coded by a coding section 71 is connected similarly to a decoding section 72 in a destination terminal equipment. If a fault takes place in the line connection, when the in-channel control signal is decoded by the reception destination decoding section 72, an undefined pattern is detected and informed to a system control section 5b, which informs the detection to the system control section of a central unit.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time division multiplexed circuit switching system,
In particular, it relates to a line connection control method that monitors line connection abnormalities when line data is connected by a time division switch in a configuration in which a data signal and an in-channel control signal are enveloped in each time division multiplexed channel. .

〔overview〕

The present invention provides a line connection monitoring and control method for monitoring and controlling connections of time-division multiplexed lines, in which an in-channel control signal of a channel enveloped with a data signal and an in-channel signal is set to a predetermined value corresponding to the line control signal. By monitoring whether the received in-channel control signal conforms to the predetermined pattern, and decoding the in-channel control signal into the line control signal for control. This makes it possible to monitor line abnormalities after line reading without requiring the addition of a check bead.

[Conventional technology]

Conventionally, most four-wire switching systems of this type do not monitor line connection abnormalities after the line is connected.

A possible control method for monitoring this kind of line connection abnormality is to send an enveloped data signal in the form of a check bit added, and the receiving side performs a check to detect line connection abnormalities.

[Problem that the invention seeks to solve]

Most of the conventional line switching systems described above have the disadvantage that they cannot detect system internal abnormalities in line connection data because they do not monitor line connection abnormalities after the line is connected.

In addition, in the method of monitoring line connection abnormalities by adding check bits to the enveloped data signal, adding the check bits requires a large channel bit width, which reduces the transmission efficiency of the trunk line. There are drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a concave line connection control system that eliminates the above-mentioned drawbacks and can monitor line abnormalities after line connection without requiring the addition of check bits.

[Means for solving problems]

The present invention provides a line connection monitoring and control method for monitoring and controlling connections of time-division multiplexed lines, in which an in-channel control signal of a channel enveloped with a data signal and an in-channel control signal corresponds to a line control signal. The in-channel control signal is encoded into a predetermined pattern and transmitted, monitors whether the received in-channel control signal follows the predetermined pattern, and decodes the in-channel control signal into the line control signal to perform control. shall be.

[Effect]

The present invention uses a signal patterned into a predetermined pattern according to "on" or "off" of a remote loop signal in a line control signal as an enveloped in-channel control signal of a channel, so that the received in-channel By checking whether the control signal follows the above-mentioned predetermined pattern, it is possible to detect an abnormality in the line connection. In other words, it is possible to monitor line connection abnormalities without the need to insert any check bits.

〔Example〕

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

FIG. 1 is a block diagram mainly showing the configuration of a line interface section of a terminal equipment of a time division multiplexed circuit switching system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a time division multiplexed circuit according to an embodiment of the present invention. FIG. 3 is a block diagram showing the system configuration of the exchange system. FIG. 3 is a block diagram showing the device configuration.

According to FIG. 2, the time division multiplex line switching system of this embodiment includes a solid equipment 1 that controls and monitors the entire system, and a plurality of terminal equipment 2 that accommodates lines and performs line control. , connected in a loop by a main line 3.

According to FIG. 3, the solid equipment 1 includes a transmission unit 4 that transmits data through a time-division multiplexed channel via a trunk vA 3.
a, and a system control unit 5a that transfers system information between the solid device 1 and the terminal device 2. The terminal device 2 similarly includes a transmission section 4b, a system control section 5b, a time division switch section 6 that connects time division multiplexed channels and lines, and a plurality of line interfaces that accommodate the line 8 and perform line control. A line 8 is connected from the line interface section to the channel by a time division switch section 6.

According to FIG. 1, the line interface unit 7 in the terminal equipment includes an envelope unit 70 that separates and multiplexes envelope data whose channels are connected by the time division switch unit 6 into a data signal and an in-channel control signal, and a line a line control unit 7 that controls the connection between the data signal separated and multiplexed by the envelope unit 70 and the line vA8;
3, and turn on the line control signal from the line control unit 73.
, an encoding unit 71 that encodes the in-channel control signal into a specific pattern defined corresponding to “off” and sends the in-channel control signal to the envelope unit 70, and the defined pattern of the in-channel control signal from the envelope unit 70. is decoded to create a line control signal and sent to the line control unit 73. If an undefined pattern is detected during decoding, the undefined pattern detection is notified to the system control unit 5b and the non-decoding unit 72 is Contains.

FIG. 4 is an explanatory diagram showing an example of a time division multiplexing format used in this embodiment. ■Multiple channels in a frame (
CHO to CH,) are time-division multiplexed, and one channel contains 6-bit data (D.

~D,) and a 2-bit in-channel control signal (C0,
C,).

FIG. 5 is an explanatory diagram showing an example of a coding pattern of this in-channel control signal C0. It shows that when the remote loop signal RL among the line control signals is "on", it takes the rl 010J pattern, and when it is "off", it takes the "1000" pattern.

A feature of the present invention is that, in FIG. 1, it includes an encoding section 71 and a decoding section 72, and encodes and decodes the in-channel control signal C0 in FIG. 4 according to the pattern defined in FIG. 5, for example. , the existence of undefined patterns is checked.

Next, the operation of this embodiment will be explained. A line 8 of a terminal 9 accommodated in a certain terminal device 2 is accommodated in a line interface section 7. The four wires 8 are the line interface section 7
It is connected to a certain time-division multiplexed channel by the time-division switch unit 6 via the transmission unit 4b and the main line 3, and then via the transmission unit 4b of the other terminal equipment 2 to the time-division switch. The channel is connected to the line interface section 7 by the section 6, and a line 8 accommodated in one terminal device 2 is connected to a line 8 accommodated in another terminal device 2. The in-channel control signal encoded by the encoder 71 according to the pattern shown in FIG. 5 is also similarly connected to the decoder 72 in the connected terminal device.

If an abnormality occurs in the line connection, when the in-channel control signal encoded by the transmitter's encoder 71 is decoded by the receiver's decoder 72, an undefined pattern other than the defined pattern is detected. The decoding unit 72 notifies the system control unit 5b of the detection of the undefined pattern. The system control unit 5b notifies the system control unit 5a of the solid device 1 via the transmission unit 4b and the trunk &i13. As a result, line connection abnormalities are intensively monitored in the solid device 1.

〔Effect of the invention〕

As explained above, the present invention detects a channel connection abnormality at the time of decoding by converting a line control signal into a predetermined encoded signal as an enveloped in-channel control signal of the channel. Can be monitored.

Therefore, line connection abnormalities can be monitored after line connection, and in-channel control signals can be used to detect abnormalities.
There is no need to increase the bit width of the channel by adding check pits to the data signal, and there is an effect that abnormality monitoring can be performed using the same channel as before.

[Brief explanation of drawings]

FIG. 1 is a block diagram mainly showing the configuration of a line interface section of a terminal device of a time division multiplexed circuit switching system according to an embodiment of the present invention. FIG. 2 is a block diagram showing the system configuration of a time division multiplex circuit switching system according to an embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of the device. FIG. 4 is an explanatory diagram showing an example of a time division multiplexing format used in this embodiment. FIG. 5 is an explanatory diagram showing an example of a coding pattern of the in-channel control signal C0. l...solid equipment, 2...terminal equipment, 3...main line,
4a, 4b...Transmission section, 5a, 5b...System control section, 6...Time division switch section, 7...Line interface section, 8...Line, 9...Terminal, 70.・
- Envelope section, 71... Encoding section, 72... Decoding section, 73... Line control section, C,, C,... In-channel control signal, D1 to D6... Data, RL・
...Remote loop signal. Masami Dai M example (Line I joined Toughney)? fEii Figure sales example (time division multiplex type) M 4 Figure size example (encoding pattern) Claw 5 l

Claims (1)

[Claims] (1) In a line connection monitoring and control method that monitors and controls the connection of time-division multiplexed lines, the in-channel control signal of the channel enveloped with the data signal and the in-channel control signal is The in-channel control signal is encoded into a pattern and transmitted, monitors whether the received in-channel control signal follows the predetermined pattern, and decodes the in-channel control signal into the line control signal to perform control. Line connection monitoring control method.