JPS58114691A - Line circuit line concentrator of time division automatic exchanging device - Google Patents

Abstract

PURPOSE:To obtain a small and economical line circuit, by setting a line circuit line concentrator between a subscriber terminal and a time division switch. CONSTITUTION:The calling state of a subscriber 1 is monitored by a local processor 8 via a line circuit 7. When the processor detects the off-hook of the subscriber 1, the circuit 7 is cut off and the subscriber 1 is connected to an idle line circuit 10 via a line circuit concentrator 9. With the on-hook of the subscriber 1, the subscriber 1 is cut off from the circuit 10. Then the subscriber 1 is connected to the circuit 7. When the subscriber 1 has an incoming, the called subscriber 1 is first connected to a test trunk 11 via the concentrator 9 and under the control of the processor 8. The trunk 11 performs a test of the subscriber line. If a satisfactory result is obtained from the test, the called subscriber 1 is connected to the circuit 10 through the concentrator 9. Then a call signal is sent to the called subscriber 1. The procedure from the answering to the on-hook is identical with the conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line circuit concentrator for a time division automatic switching system.

Traditionally, time-division automatic switching equipment has functions such as supplying call power to subscribers, overvoltage protection, calling signal transmission, 2-wire to 4-wire conversion during DC monitoring, testing of subscriber lines, and howling sound transmission. A circle with a line circuit. Figure 1 is a block diagram of a conventional system. In Figure 1, 1 is a subscriber's telephone, 2 is a line circuit provided for the subscriber, and 3 is a call power supply, overvoltage test, and call line for the subscriber. signal transmission,
A portion having the functions of DC loop monitoring of the subscriber line, 2M-4 line conversion, and subscriber line testing, 4 is a howler sound generator, 6 is an analog-digital signal modem, and 6 is a time division switch.

In such a device, a line circuit is provided for each subscriber, so one point is to make the line circuit smaller and more economical.

The present invention eliminates these drawbacks of the conventional ones, and provides a line circuit concentrator between the subscriber terminal and the time division switch in a time division automatic switching device, which was conventionally necessary for supporting subscribers. Tsuyu power supply to subscribers Overvoltage protection film
A line circuit with the functions of calling signal transmission, i[monitoring, 2@-4 line conversion, subscriber line testing, and howler sound transmission is housed in the line circuit blanking device 11, and the subscriber is accommodated on the input side. By doing so, we can reduce the number of line circuits, round up the line concentration, and disperse some of the functions of these line circuits, such as calling signal transmission, subscriber line testing, and back and forth sound transmission. By doing so, the aim is to provide a small and economical line circuit.

According to the present invention, the subscriber terminal is placed between the subscriber terminal and the time division switch, and the subscriber terminal is placed on the inlet side, and the power supply function, overvoltage testing function, call signal sending function, and DC monitoring function for the subscriber is placed on the shore side. ! Time-division automatic switching equipment that accommodates line circuit trunks with all functions such as l-411 function, subscriber automatic test function, and sound transmission function, or line circuit trunks with distributed functions. A line circuit concentrator is obtained.

Next, embodiments of the present invention will be described using the drawings. FIG. 2 is a block diagram of an embodiment of the present invention. In FIG.
is a modulator/demodulator for analog/digital signals, and 6 is a time division switch for the first FI! 7 is a line circuit that only monitors the subscriber's DC loop, 8 is a local processor for controlling a line circuit concentrator, and 9 is a line circuit concentrator.

10 is a line circuit obtained by removing only the subscriber test function from the line circuit 2 shown in FIG. 1, and 11 is a test trunk for testing subscriber lines.

The call status of subscriber 10 is monitored by local processor 8 via line circuit 7t. When the local processor 8 detects that the subscriber 1 is off-hook, the line circuit 7
The subscriber 1 and the vacant line circuit 10 are connected through the 1r disconnection line circuit concentrator 9t. After connection to the line circuit 10, the line circuit 10 monitors the call until the end of the call, as in the conventional method. Upon termination of the call, line circuit 10 and subscriber 1 are disconnected, and subscriber 1 is connected to line circuit 7t.

In the case of an incoming call to subscriber l, under the control of the local processor 8 first the test trunk 11 and the called subscriber i? Test the subscriber line by connecting it through the line circuit hemming device and test trunk 11, and if the result is good, send out and join the called subscriber 1 and the line circuit side ゛tcl 4. Call person 1. The process from the subscriber response to the end of the call is monitored by the subscriber circuit 10 in the same way as in the conventional method, and when the call ends, the connection between the Sugi subscriber circuit IO and the subscriber 1 is disconnected, and the connection between the subscriber 1 and the subscriber circuit 7 is made. , the subscriber circuit 7 monitors the subscriber's calls.

According to the present invention, the lines are concentrated by the line circuit concentrator.
100 subscriber circuits, so the number of circuits is small.
Also, since the lines are concentrated, functions can be distributed, so
A small and economical subscriber circuit can be provided.

[Brief explanation of drawings]

FIG. 1 shows a conventional block diagram, and FIG. 2 shows a block diagram of an embodiment of the present invention. 1...Subscriber, 2...Telephone power supply to subscriber, overvoltage protection, calling signal sending, DC loop monitoring of subscriber line% zm-[i conversion, subscriber line test line circuit with functions, 4...)・back sound generator, 5...analog-digital signal modulator/demodulator, 6...time division switch, 7...・・・
・Line circuit that only monitors the subscriber's DC loop, 8
...Local processor for controlling line circuit concentrator, 9...Line circuit concentrator, 10...
. . . Line circuit from 2 in FIG. 1 except for the subscriber line test function, 11 . . . Test trunk for testing subscriber lines. Agent: Uchihara Uchihara, patent attorney.・ 1″′pa, ＼
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Claims (1)

[Claims] It is located between the subscriber terminal and the time division switch, and has the subscriber terminal on the input side and the subscriber power supply function, overvoltage protection function, calling signal sending function, DC monitoring function, and 2i1- on the output side.
1. A line circuit concentrator for a time division automatic switching system, which is characterized by accommodating a line circuit trunk having functions such as 48 functions, a subscriber automatic test function and a howler sound transmission function, or a line circuit trunk having distributed functions.