JPH0574279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a dialed digit reception system, particularly to detecting changes in subscriber line status signals used for call disconnection monitoring after being concentrated by a concentrator circuit switch. The present invention relates to a dial digit reception system in a time division exchange having a dial digit reception circuit that counts and stores digits.

(b) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional dial digit reception system in this type of time division switch.
In FIG. 1, n telephones 1 are connected to each corresponding subscriber circuit 3 via subscriber lines 2. In FIG. The subscriber circuit 3 transmits the calling state of the telephone 1 to the control circuit 9. When the control circuit 9 detects the calling telephone 1 via the subscriber circuit 3, it executes the calling process for the telephone 1, and controls the multiplexing circuit 4, the time division concentrator channel switch 5, and the demultiplexing circuit 6. Then, a communication path is established from the subscriber circuit 3 to an empty time slot on the outgoing highway 10. The subscriber circuit 3 converts the voice (analog signal) sent out by the telephone 1 into a digital code consisting of, for example, 8 bits, and transmits it to the outgoing time slot connected via the communication path. Further, the subscriber circuit 3 generates a subscriber line status signal consisting of 1 bit indicating the intermittent state of the loop current supplied to the telephone set 1 that made the call via the subscriber line 2, and uses the same communication path as the digital code. via the output time slot. The digital code in the outgoing time slot is transmitted to a distribution device, not shown, and the subscriber line status signal is transmitted to a call monitoring memory 7 and a dialed digit receiving circuit 8. The control circuit 9 executes a call disconnection monitoring process in which the subscriber line status signal received and stored in the call monitoring memory 7 is monitored at predetermined intervals (for example, 100 to 200 milliseconds), and determines whether the loop current remains in the disconnected state for a predetermined period of time or more. When the telephone 1 is detected, the telephone 1 executes call disconnection processing to determine that the telephone 1 has been restored. Further, the dial digit receiving circuit 8 counts the dial pulses sent by the calling telephone 1 by monitoring the intermittent state of the received subscriber line status signal at a predetermined period (for example, 4 milliseconds), and converts the dial digits into 1 Accumulate numbers. Note that when the subscriber circuit 3 detects the calling state of the telephone 1, it transmits a subscriber line state signal to the call monitoring memory 7 and the dialed digit receiving circuit 8 before connecting to an empty time slot of the outgoing highway 10. If this is attempted, it would be necessary to prepare a call monitoring memory 7 and a dialed number receiving circuit 8 for each subscriber circuit 3, which may impair the economic efficiency of the time-sharing electronic exchange. In order to avoid that, take Hwy 10.
Economic efficiency is achieved by transmitting the subscriber line status signal to the call monitoring memory 7 and the dialed number receiving circuit 8 after the subscriber line is connected to a vacant time slot. The control circuit 9 executes a dial number reception process that extracts the dial numbers stored in the dial number receiving circuit 8 one by one. Furthermore, telephone 1
While the telephone is transmitting dialed digits, the subscriber line status signal stored in the call monitoring memory 7 also changes according to the dial pulse, so the control circuit 9 attempts to disconnect the call from the telephone 1 each time.

As is clear from the above explanation, in the conventional dialed number reception system, the subscriber line status signal of the calling telephone 1 is transmitted to the dialed number reception circuit 8 and the call monitoring memory 7 in parallel, so that the control circuit 9 is a disadvantage in that each time the subscriber line status signal changes in accordance with the dial pulse sent by the telephone 1, the telephone 1 attempts to disconnect the call, increasing the invalid load on the control circuit 9 and reducing the processing capacity. There is. Furthermore, the dialed number receiving circuit 8 must receive subscriber line status signals transmitted to all outgoing time slots included in the outgoing highway 10, which results in a loss of economic efficiency of the time division exchange.

(c) Object of the Invention The object of the present invention is to eliminate the drawbacks of the conventional dialed digit reception system as described above, and to eliminate the increase in the reactive load of the control circuit caused by the transmission of dialed digits from the telephone.
In addition, the goal is to realize a means to prevent a decline in processing capacity.

(d) Structure of the Invention The object of the present invention is to provide a plurality of subscriber circuits 3 which are provided corresponding to subscriber lines and output digitally encoded subscriber line status signals, and to output the outputs of the subscriber circuits to a plurality of time slots. A multiplexing circuit 4 that multiplexes the signal and outputs it to the input highway; and a time division concentrator line switch that inputs the multiplexed signal from the input highway, connects it to a predetermined time slot of the first output highway, and outputs it. 5, a demultiplexing circuit 6 that separates the first outgoing highway and outputs it to the second outgoing highway 10, and a distribution device that inputs the second outgoing highway, and exchanges under the control of a control circuit 9. In a time-sharing electronic exchange that performs connection control, a call monitoring memory 7 monitors call disconnection from a subscriber line status signal for the second outgoing highway.
and a dialed number receiving circuit 11 that receives subscriber line status signals from a subscriber line status signal is connected to a third outgoing highway different from the second outgoing highway by the demultiplexing circuit, and the control circuit includes:
This is achieved by connecting a time slot in the first outgoing highway corresponding to the subscriber line that performs dialed digit reception processing among the subscriber lines to the third outgoing highway.

(e) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a dial digit reception method according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of an exit highway for explaining the operation of the embodiment. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, calling telephone 1
A dialed number receiving circuit 11 for receiving dialed digits sent out is connected to an outgoing time slot of the multiplexing/demultiplexing circuit 6 which is different from the outgoing time slot included in the outgoing highway 10. The output highway connected to the output of the demultiplexing circuit (DMPX) 6 is represented by the configuration shown in FIG. 3, for example. That is,
The outgoing highway is composed of m lines, for example, from 10-1 to 10-m, and each outgoing highway is composed of frames in which the time slot of - is one frame. The dial digit receiving circuit (DPR) 11 is
For example, it is connected to an empty time slot on the outbound highway 10-2 shown in FIG. That is, in the dial number receiving circuit 11, the above-mentioned output highway 10-
The subscriber line status signal inserted into the second time slot is received. The control circuit 9 is the first
As in the figure, when the calling telephone 1 is detected via the subscriber circuit 3, the calling processing for the telephone 1 is executed, and the multiplexing circuit 4, the time division concentrator channel switch 5, and the multiplexing/demultiplexing circuit 6 are controlled. Then, a communication path is set for the subscriber circuit 3 to reach the outgoing time slot of the outgoing highway 10-2 corresponding to the dialed digit receiving circuit 11, and the subscriber line status signal sent from the subscriber circuit 3 is received by the dialed digits. The signal is transmitted to the circuit 11. At this stage, the subscriber circuit 3 is not yet connected to the outgoing time slots included in the outgoing highway 10 leading to the distribution device. The dial digit receiving circuit 11 counts the dial pulses sent by the calling telephone 1 by monitoring the intermittent state of the received subscriber line status signal at a predetermined period (for example, 4 milliseconds), and converts the dial digit into one digit. Accumulate the address. The control circuit 9 includes a dial number receiving circuit 11
Executes a dial digit reception process that extracts the dial digits accumulated in the count of 1 to 1 digit. Meanwhile, since the subscriber line status signal is not transmitted to the call monitoring memory 7, the control circuit 9 does not execute the call disconnection monitoring process via the call monitoring memory 7 for the telephone set 1 which is sending dialed digits. The control circuit 9, which has finished sending dialed digits from the calling telephone 1 and finished receiving the dialed digits, controls the multiplexing circuit 4, the time division concentrator channel switch 5, and the demultiplexing circuit 6,
The communication path set between the subscriber circuit 3 and the dialed number receiving circuit 11 is opened. Then, for example, a communication path is set up to the outgoing time slot of the outgoing highway 10-1 shown in FIG. 3, and the digital code is transmitted to a distribution device (not shown) using the outgoing time slot of the outgoing highway 10-1. The subscriber line status signal is transmitted to the call monitoring memory 7.
Thereafter, the control circuit 9 executes the call disconnection monitoring process of the telephone 1 in the same process as in FIG.

As is clear from the above description, according to this embodiment, the subscriber line status signal of the calling telephone 1 is stored in the call monitoring memory 7 until the dial digit reception process is completed.
The control circuit 9 does not execute call disconnection monitoring processing. Therefore, changes in the subscriber line status signal corresponding to dial pulses can be completely prevented from affecting the call monitoring performed by the control circuit 9 via the call monitoring memory 7. Also, the number of outgoing time slots through which the dialed digit receiving circuit 11 receives subscriber line status signals can be determined independently of the number of outgoing time slots included in the outgoing highway 10 leading to the distribution device.

It should be noted that FIG. 2 is merely one embodiment of the present invention, and the configuration of the time division switch that is the object of the present invention is not limited to that shown in the figure, and many other modifications may be considered. However, the effects of the present invention do not change in either case.

(f) Effects of the Invention As described above, according to the present invention, in the time division exchange, it is possible to prevent an increase in the invalid load of the control circuit and a decrease in processing capacity caused by the transmission of dialed digits from a telephone, and also to prevent the dialed digits from being received. The number of outgoing time slots through which the circuit receives subscriber line status signals can also be minimized, making it possible to improve the economic efficiency of the time division exchange.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional dial digit reception system, FIG. 2 is a diagram illustrating a dial digit reception system according to an embodiment of the present invention, and FIG. 3 is a diagram showing an exit highway for explaining the operation of the embodiment. FIG. In the figure, 1 is a telephone set, 2 is a subscriber line, 3 is a subscriber circuit, 4 is a multiplexing circuit, 5 is a time division concentrator line switch, 6 is a demultiplexing circuit, 7 is a call monitoring memory, 8 and 11 are Dial number receiving circuit,
Reference numeral 9 indicates a control circuit, and reference numeral 10 indicates an exit highway.

Claims (1)

[Scope of Claims] 1. A plurality of subscriber circuits 3 which are provided corresponding to subscriber lines and output digitally encoded subscriber line status signals, and the outputs of the subscriber circuits are multiplexed into a plurality of time slots. a multiplexing circuit 4 for outputting to the incoming highway; a time-division concentrator channel switch 5 for inputting the multiplexed signal from the incoming highway, connecting it to a predetermined time slot of the first outgoing highway and outputting it; A demultiplexing circuit 6 that separates the first outgoing highway and outputs it to a second outgoing highway 10, and a distribution device that inputs the second outgoing highway, and performs exchange connection control under the control of a control circuit 9. In the time-sharing electronic exchange, a call monitoring memory 7 for monitoring call disconnection from subscriber line status signals is connected to the second outgoing highway, and a third outgoing highway different from the second outgoing highway is connected to the second outgoing highway by the demultiplexing circuit. A dialed number receiving circuit 11 that receives a subscriber line status signal is connected to the subscriber line, and the control circuit is configured to connect the first dialed number receiving circuit 11 corresponding to the subscriber line that performs the dialed number receiving process among the subscriber lines. The third time slot on the exit highway
A dial number reception method characterized by connection to the Node Highway.