JPH05344547A - Call detection control system - Google Patents

Abstract

PURPOSE:To prevent power consumption from being increased even when the number of telephone subscriber's lines is increased by supplying operation power to all individual call detection circuits when a common call detection circuit detects a call signal from a certain telephone subscriber's circuit. CONSTITUTION:When all telephone subscriber's lines 30 to 32 are non-calling states, a break side contact out of two transfer contacts of each relay in switching circuits 40 to 42 is connected to the common call detection circuit 2 for monitoring call signals outputted from the individual lines 30 to 32 in common. On the other hand, power supply from a power supply circuit 3 to individual call detection circuits 10 to 12 is stopped by make contacts in the individual power supply circuits 20 to 22. In this case, power is directly supplied from the circuit 3 to the circuit 2. When a call signal is outputted from the line 30, the circuit 2 controls the circuits 20 to 22 in order to identify the calling circuit 30 and drives its corresponding contact. Consequently the lines 30 to 32 are connected to the circuits 10 to 12 and operation power is individually supplied. Consequently even when the number of subscriber's lines is increased, power consumption can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call detection control method in a subscriber circuit of a telephone exchange system.

[0002]

2. Description of the Related Art In a subscriber circuit of a conventional telephone switching system, all the individual call detection circuits prepared for each subscriber line are always supplied with power regardless of the call state of each subscriber. , The method of constantly monitoring the calling signals from individual telephone subscriber lines is adopted.

Further, a recent call detection circuit is realized by an electronic circuit composed of semiconductor elements in consideration of downsizing, weight reduction, economy, durability, operating speed, etc., and by its nature, it is always biased. It supplies the power for use, and always operates by consuming the bias current.

[0004]

This conventional call detection control system has a drawback that wasteful power is consumed inside the individual call detection circuit even when there is no call, and the telephone subscriber line to be connected is connected. There is a drawback in that the wasted power increases as the number increases.

[0005]

A call detection control system according to the present invention comprises a common call detection circuit for commonly monitoring call signals from a plurality of telephone subscriber lines, and individual telephone subscriber lines. An individual call detection circuit that individually monitors the call signal of
A switching circuit for switching and connecting the individual telephone subscriber lines to the common call detection circuit and the individual call detection circuit; and when the common call detection circuit detects a call signal from the telephone subscriber line. A power supply circuit for supplying operating power to all the individual call detection circuits.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a call detection control system of the present invention.

As shown in FIG. 1, in the present embodiment, the subscriber circuit 1 of the telephone exchange system includes individual telephone subscriber terminals (not shown) via three telephone subscriber lines 30, 31, 32. It is connected to the device. In addition, the subscriber circuit 1 commonly monitors the call signals from the individual telephone subscriber lines 30, 31, 32 and the common call detection circuit 2 and the call signals from the telephone subscriber lines 30, 31, 32. Individual call detection circuits 10, 11 and 12 for individually monitoring the telephone and the telephone subscriber line 3
Switching circuit 4 for switching 0, 31, and 32 to common call detection circuit 2 and individual call detection circuits 10, 11, and 12, respectively
0, 41, 42 and individual call detection circuits 10, 11, 12
Power supply circuits 20 and 2 for individually controlling the power supply of
1, 22 and the common call detection circuit 2 directly, and the individual call detection circuits 10, 11, 12 to the individual power supply circuit 2
The power supply circuit 3 supplies the operating power supply necessary for the operation of each circuit via 0, 21, 22 respectively.

Next, the operation of this embodiment will be described.
First, when all the telephone subscriber lines 30, 31, and 32 are in the non-call state, the connection is as shown in FIG. That is, the two sets of transfer contacts of the respective relays in the switching circuits 40, 41 and 42 have their break side contacts commonly monitored for call signals from the individual telephone subscriber lines 30, 31, 32. It is connected to the detection circuit 2. or,
The power supply from the power supply circuit 3 to the individual call detection circuits 10, 11, 12 is stopped by the make contacts in the individual power supply circuits 20, 21, 22. On the other hand, power is directly supplied from the power supply circuit 3 to the common call detection circuit 2.

Next, when a calling signal arrives from the telephone subscriber line 30, the connection shown in FIG. 2 is established. That is, when a calling signal arrives from the telephone subscriber line 30 during the connection shown in FIG. 1, the common calling detection circuit 2 detects the calling signal. Here, the common calling detection circuit 2 is not aware of which telephone subscriber line of the telephone subscriber lines 30, 31, 32 the calling signal detected is.

The common call detection circuit 2 controls the individual power supply circuits 20, 21, 22 as shown in FIG. 2 in order to identify the telephone subscriber line to which the call signal has arrived, and the make contact is indicated by a broken line. And the individual call detection circuits 10 and 1
1 and 12 are supplied with operating power from the power supply circuit 3 and the switching circuits 40, 41, 42 are controlled to operate the transfer contacts as shown by the broken lines, and the telephone subscriber line 3
0, 31, and 32 are the individual call detection circuits 10 and 1, respectively.
1 and 12, the call signals from the individual telephone subscriber lines are individually monitored in the state shown in FIG.

Next, when the individual call detection circuit 10 detects a call signal from the telephone subscriber line 30, the connection shown in FIG. 3 is established. That is, at the time of connection shown in FIG. 2, the individual call detection circuit 1 detects the call signal from the telephone subscriber line 30.
0, as shown in FIG. 3, individually controls the switching circuit 40 and the individual power supply circuit 20 for the individual call detection circuit 10 so that the operation of the transfer contact and the make contact in each circuit is indicated by a broken line. Hold it. In the individual call detection circuits 11 and 12 that did not detect the call signal, after a certain time, the switching circuit 41 and the individual power supply circuit 2 respectively.
1, the switching circuit 42 and the individual power supply circuit 22 are individually controlled to restore the operations of the transfer contact and the make contact in the circuit to the state shown by the solid line, and are connected to the common call detection circuit 2 again and the power circuit 3 Stop the power supply from.

Finally, when the telephone subscriber line 30 ends the call, the state returns to the non-call state shown in FIG. That is,
Individual call detection circuit 10 upon termination of telephone subscriber line 30
Individually controls the switching circuit 40 and the individual power supply circuit 20 to restore the operation of the transfer contact and the make contact in each circuit.

[0013]

As described above, according to the present invention, a common call detection circuit for commonly monitoring call signals from a plurality of telephone subscriber lines and an individual call signal from each telephone subscriber line are separately provided. Individual call detection circuit for monitoring, a switching circuit for switching individual telephone subscriber lines to the common call detection circuit side and the individual call detection circuit side, and a power supply circuit for supplying operating power to the individual call detection circuit The power supply to the individual call detection circuit when there is no call is stopped, and instead the common call detection circuit that commonly monitors the call signal and the individual call of the telephone subscriber line in the call state Since power is supplied only to the detection circuit, it is possible to eliminate power consumption consumed inside the individual call detection circuit when there is no call.

Even if the number of telephone subscriber lines increases and the number of individual call detection circuits increases, the number of telephone subscriber lines when there is no call is large, so the individual call detection circuits consume the call when there is no call. The integrated power consumption is zero, and the power consumed instead is only the power consumed inside the common call detection circuit, and even if the number of telephone subscriber lines increases, it is consumed by the individual call detection circuit when there is no call. Since there is no increase in the power consumption, the power consumption related to the subscriber circuit of the telephone exchange system can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a call detection control system of the present invention.

FIG. 2 is a block diagram showing a state when a calling signal is detected by a common calling detection circuit in FIG.

FIG. 3 is a block diagram showing a state when a calling signal is detected by an individual call detection circuit in FIG.

[Explanation of symbols]

 1 subscriber line 2 common call detection circuit 3 power supply circuit 10, 11, 12 individual call detection circuit 20, 21, 22 individual power supply circuit 30, 31, 32 telephone subscriber line 40, 41, 42 switching circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Sasaki Tohoku NEC Corporation, 1 Kagarai, Ichinoseki, Iwate Prefecture

Claims (1)

[Claims] 1. A common call detection circuit for commonly monitoring call signals from a plurality of telephone subscriber lines, and an individual call detection circuit for individually monitoring call signals from each of the telephone subscriber lines. A switching circuit for switching and connecting the individual telephone subscriber lines to the common call detection circuit and the individual call detection circuit; and the common call detection circuit detects a call signal from the telephone subscriber line. And a power supply circuit that supplies operating power to all of the individual call detection circuits when the call is detected.