JP2752628B2 - Dial pulse receiving circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a trunk device of an automatic telephone exchange, and more particularly to a dial pulse receiving circuit in an incoming trunk device.

[Conventional technology]

Conventionally, an incoming trunk device of this type has a relay as a means for monitoring or receiving a subsequent activation signal, a dial pulse signal and a recovery signal output from a preceding local outgoing trunk device, and a means for receiving a subsequent response. Use,
Each device is configured by using a contact point of the relay as a means for transmitting a signal to a subsequent device.

An example of a dial pulse receiving circuit in a conventional incoming trunk device is shown in FIG. 3 and described.

In the figure, 11 is means for monitoring or receiving a subsequent activation signal, a dial pulse signal and a recovery signal output from the preceding local station trunk device (hereinafter referred to as A relay);
Reference numeral 12 denotes output means (hereinafter, referred to as SS) for transmitting a signal received by the contact point of the A relay 11 to the downstream, and 13 denotes means for receiving a response of the downstream (hereinafter, referred to as R relay). Show.

The incoming trunk device is opposed to the preceding outgoing trunk device via a trunk line, and the line has a line resistance and a capacitance component determined by its line type and length. Further, the A relay 11 and the like connected to the line in the trunk device need to exhibit a high impedance with respect to the voice AC signal on the line, and have a high inductance.

[Problems to be solved by the invention]

The above-described dial pulse receiving circuit in the conventional ingress trunk device has a capacity on the line when receiving the subsequent start signal, dial pulse signal, and restoration signal output from the preceding local outgoing trunk device by a known signal system. Charge and discharge, and high voltage is generated at the time of reversal and recovery due to the inductance of the A relay.
As a result, there is a problem that the operation and the recovery time of the A relay and the relay in the opposite outgoing trunk device greatly fluctuate, and an erroneous signal is output to the rear and the front.

[Means for solving the problem]

The diamond pulse receiving circuit of the present invention monitors and receives a subsequent start signal, a dial pulse signal, and a recovery signal output from a preceding local station trunk device, and sends a signal received by this means to a subsequent device. Means, receiving means for receiving the subsequent response, and means for providing a predetermined protection time to the output signal of the monitoring or receiving means in response to a signal from the receiving means for receiving the subsequent response By masking the above-mentioned protection time for the erroneous signal generated during the operation other than the reception of the dial pulse due to the capacitance and inductance on the line, that is, the erroneous signal generated at the time of reversal and restoration, the erroneous signal duration is controlled. In this case, an erroneous signal to the means for transmitting the signal to the subsequent position is removed.

[Action]

In the present invention, by controlling a guard circuit that delays the output of the A relay by a predetermined protection time with the output signal of the R relay, an erroneous signal generated at the time of operation other than the reception of the dial pulse, that is, at the time of reversal or restoration, Is masked during the above protection time, and an erroneous signal to SS (Signal Send) can be removed.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a dial pulse receiving circuit according to the present invention.

In the figure, reference numeral 1 denotes an A relay, which constitutes means for monitoring or receiving a subsequent activation signal, a dial pulse signal, and a recovery signal output from a preceding local station trunk device. Reference numeral 2 denotes an SS, and SS2 constitutes means for transmitting a signal received by the A relay 1 to a subsequent position. Reference numeral 3 denotes an R relay, and the R relay 3 constitutes a receiving means for receiving a subsequent response. Reference numeral 4 denotes a guard circuit. The guard circuit 4 constitutes means for giving or not giving a predetermined protection time to the output of the monitoring or receiving means by the output signal of the receiving means.

Then, the erroneous signal to the means for transmitting the signal to the subsequent position is masked by the protection time for masking the erroneous signal continuation time for the erroneous signal generated at the time of reversion and recovery due to the capacitance and inductance on the line. It is configured to get rid of.

FIG. 2 is a time chart for explaining the operation of FIG. 1 and shows the operation state.

In FIG. 2, (a) shows the contact output of the A relay 1, (b) shows the output of SS2, and (c) shows the output of R.
The contact output of the relay 3 and (d) show the protection time of the guard circuit 4. And each low level is off (OF
F), a high level indicates ON. In addition,
(A) shows the subscriber number pulse relay, (b) starts,
(C) shows the post-response, and (d) shows the recovery.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG.

The R relay 3 is restored at the time of activation, reception of a dial pulse, and relaying (see FIG. 2 (c)). In this state, the output of the A relay 1 (FIG. 2 ( a) guard circuit 4 for
Is directly connected between the input and the output, and the dial pulse relay is performed faithfully. Then, during the period from the subsequent response shown in (c) of FIG. 2 to the end of the call, the R relay 3 is operated (see FIG. 2 (c)) by the SR signal from the downstream device (not shown). In the state of the output signal of the R relay 3 in the state, the output of the A relay 1 (see FIG. 2A) is a mono-stable multi that gives a predetermined protection time between the input and output of the guard circuit 4. By providing a vibrator (not shown) and setting the time at which the output of the mono-stable multivibrator changes to be greater than the erroneous signal,
It can be removed from being sent to SS2.

As described above, the present invention responds to the signal from the means for receiving the response of the subsequent station, and activates the
A means for giving a predetermined protection time to an output signal of a means for monitoring or receiving a dial pulse reception, relay, and recovery signal is provided, and whether or not a protection time is given by an SR signal is controlled. By setting the protection time to be longer than the erroneous output time of the A relay, the drawbacks of the conventional trunk can be solved.

Note that the present invention is also applicable to a trunk circuit of an electronic circuit other than the relay in which the A relay, the R relay, and the like are used, and can be downsized.

[Effects of the Invention] As described above, according to the present invention, in response to a signal from a means for receiving a subsequent response, activation from a preceding station outgoing trunk device, reception of a dial pulse, relaying, and recovery. A means for giving a predetermined protection time to the output signal of the means for monitoring or receiving the signal, and by setting the protection time of this means to be longer than the erroneous output time of the A-relay, erroneous output is provided for the rear and front positions. There is an effect that a signal can be prevented from being output. The effect is also obtained for a trunk circuit of an electronic circuit other than the relay, and it is extremely effective in that it is more effective, for example, a miniaturization effect is obtained.

[Brief description of the drawings]

1 is a block diagram showing an embodiment of a dial pulse receiving circuit according to the present invention, FIG. 2 is a time chart for explaining the operation of FIG. 1, and FIG. 3 is a block diagram showing an example of a conventional dial pulse receiving circuit. FIG. 1 ... A relay, 2 ... SS, 3 ... R relay, 4 ... Guard circuit.

Continuation of front page (73) Patent holder 999999999 Oki Electric Industry Co., Ltd. 1-7-12 Toranomon, Minato-ku, Tokyo (72) Inventor Masaki Yagyu 5-3-13-1 Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Kazuo Hamari 3-9-1, Midoricho, Musashino-shi, Tokyo Nippon Telegraph and Telephone Corporation Inside Communication Network First Research Laboratory (72) Inventor Kazuhide Uehara 1015 Uedanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Stock Inside the company (72) Inventor Makoto Hashimoto 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Totsuka Plant, Hitachi, Ltd. (72) Inventor Hiroaki Nozaki 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. Inside

Claims (1)

(57) [Claims] 1. A dial pulse receiving circuit of an incoming trunk device provided in an automatic telephone exchange and connected to a preceding local outgoing trunk device via a trunk line, wherein a rear end output from the preceding local outgoing trunk device is provided. Means for monitoring or receiving a start signal, a dial pulse signal and a recovery signal; means for transmitting a signal received by this means to a subsequent device; receiving means for receiving a subsequent response; and receiving the subsequent response Means for providing a predetermined protection period to an output signal of the monitoring or receiving means in response to a signal from the receiving means.