JPH01317099A - Line terminator - Google Patents

Abstract

PURPOSE:To eliminate need for any exclusive common line signal device by starting the terminator when the processing program of the level 2 of the CCITT recommendations No.7 signal system when a PCM line is used for a common line signal and processing the data for a start signal channel. CONSTITUTION:A channel of PCM lines 1-N is multiplexed by a multiplex circuit 6, inputted to a communication equipment 5, a signal channel of the PCM lines 1-N is extracted by a dropper/inserter circuit 2, subjected to format conversion and inputted to a central control unit 4 in the path of a control circuit 3, a channel interface 7 and the communication equipment 5. Moreover, an instruction from the central control unit 4 is given to the control circuit 3 in a path of the equipment 5 and the channel interface 7, subjected to format conversion and inserted to the PCM line 1 from the dropper/inserter circuit 2. In case of using the PCM line 1 as the common line signal, the central controller 4 commands the processing of the level 2 of the CCITT recommendations No.7 signal system to the control circuit 3 in advance and applies processing. Thus, the exclusive common line signal equipment is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line termination device in a digital switching system.

[Conventional technology]

Conventionally, a line termination device extracts and inserts a channel for common line signals, and performs signal processing.After multiplexing the PCM line, it is sent to the communication path device of the exchange, and the common line signal device is connected to the communication path device. Due to the extraction of signaling channels and level 2 of CCITT-Recommendation Na, 7 signaling system.
is being processed.

[Problem to be solved by the invention]

The conventional line termination device described above is based on CCITT Recommendation N[L
Since signal processing of the 7-signal system is not performed, a dedicated common line signal device connected to the communication line device of the exchange is required, which inevitably increases equipment costs.

[Means to solve the problem]

The present invention includes means for multiplexing PCM lines and then connecting them to a communication path device of an exchange, and executing a signal processing program for each signal type that cannot be written in a memory according to a signal type supported by a central control unit of the exchange. means for processing the signal channel data extracted from the line, converting it into a format that can be interpreted by the central control unit of the exchange, and sending it to the communication path device; In a line termination device equipped with a means for converting the format and inserting it into a signal channel of a PCM line, a level 2 processing program of the CCITT Recommendation N (L 7 signal system) provided in a memory for signal processing for each signal system is inserted into a signal channel of a PCM line. means for processing the data of the signaling channel which is activated when the channel is being used for common channel signaling;

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to the figure showing one embodiment of the present invention, a digital exchange 9 is composed of a channel device 5 and a central control device 4. As shown in FIG. PCM line 1 connected to another exchange, etc.
~N communication channels are connected to the multiplexing circuit 6 of the line termination device 10.
The signals are multiplexed and input to the communication path device 5 of the exchange 9, but the signal channels of the PCM lines 1 to N are extracted by the dropper/inserter circuit 2. Control circuit 3
The central controller 4 instructs which signal system to use for the extracted signal channel.

When the control circuit executes a program for each signal system written in the memory 8, the extracted signal channel data is processed and converted into a format that can be interpreted by the central control unit 4 of the exchange 9, and the control circuit 3 , are input to the central controller 4 via the path of the communication path interface 101 and the communication path device 5. In addition, commands from the central controller 4 are input to the control circuit 3 via the channel device 5 and the channel interface 10, are similarly processed and format-converted, and are inserted into the PCM line 1 from the dropper/inserter circuit 2. . When using the PCM line 1 for common line signals, the central control unit 4 sets the control circuit 3 to
By instructing to perform level 2 processing of the CITT Recommendation Nα7 signaling system, processing is performed in the same procedure as above.

〔Effect of the invention〕

As explained above, according to the present invention, a common line signaling device is installed on the exchange side by processing data of a common control signal channel extracted from a PCM line according to the signaling system written in the memory. It is possible to process CCITT Recommendation N (Level 2 of the L7 signaling system) using only the line termination equipment without the need for any equipment.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the line termination device of the present invention. 1 to N: PCM line, 2 nitro tube/inserter circuit,
3; Control circuit, 4: Central control device, 5: Communication path device, 6
: multiplexing device, 7: communication path interface, 8: memory, 9: exchange, 10: line termination device.

Claims (1)

[Claims] After multiplexing the PCM line, a means for connecting it to the communication line equipment of the exchange and a signal processing program for each signal system written in the memory according to the signal system supported by the central control unit of the exchange are executed and disconnected from the PCM line. means for processing and converting the data of the signal channel issued into a format that can be interpreted by the central control unit of the exchange and transmitting it to the communication path device; and converting the format of the signal control data from the central control unit of the exchange. In a line termination device equipped with a means for inserting into a signal channel of a PCM line, a CCI provided in a memory for signal processing for each signal system.
TT Recommendation No. 1. A line termination device comprising means for activating a level 2 processing program of a PCM line when a PCM line is used for a common line signal and processing data of a signal channel.