JPH06339171A - Line concentrator - Google Patents

Abstract

PURPOSE:To reduce power consumption by supplying power to a transmission system corresponding to a terminal equipment hooked off when the terminal equipment makes transmission and not supplying power to the transmission system in the other states. CONSTITUTION:When a telephone set T1 is hooked off, a DC loop is formed and a loop detection circuit 7 closes a switch S1. When a voice signal is inputted from the telephone set T1 succeedingly and a transmission signal appears at a transmission system output of a hybrid circuit 3, a switch S2 is closed by a transmission detection circuit 8. Thus, power is supplied to a transmission system circuit 5 and the transmission signal is sent to a multiplex processing system 6 by the operation of the transmission system 5 and processed multiplexedly and sent to a private branch of exchange or the like through a trunk line. When no call is made but a voice of an opposite party is heard, since the switch S2 is open by the transmission detection circuit 8, the power supply to the transmission system circuit 5 is stopped and when the speech is started, the power is supplied again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrator for concentrating signal lines of a plurality of terminals, and more particularly to a concentrator intended to reduce power consumption.

[0002]

2. Description of the Related Art In some digital switching systems, a concentrator having multiple channels is provided in order to efficiently use a transmission line between a plurality of telephones and a switching system.

FIG. 2 is a schematic block diagram showing an example of a digital switching system having a concentrator.

The signal lines of m telephones Tf1 to Tfm are connected to a concentrator 101 and are connected to a central office line through a private branch exchange 102. The concentrator 101 multiplexes the signal from the telephone and sends it to the private branch exchange 102, and also separates the external line signal from the private branch exchange and sends it to the destination telephone. This makes efficient use of transmission line resources.

In such a private branch exchange system, for example, when it becomes necessary to install a large number of emergency telephones at the time of a disaster, a portable mobile line concentrator 103 is separately installed and telephones T1 to Tn are provided to provide an emergency situation. A method of coping is adopted.

[0006] In particular, a portable and portable line concentrator may be installed outdoors, so that it is necessary to supply its power from a battery.

[0007]

However, in the conventional concentrator, since the channel for which the telephone is not set is turned off, the channel for which the telephone can be used is always powered. Was turned on, resulting in power consumption regardless of whether or not it was actually used.

In particular, it is desirable to avoid such power consumption as much as possible in a concentrator which requires power saving, such as a portable type.

[0009]

The concentrator according to the present invention is characterized in that power is supplied to the transmission system of the channel when each terminal is off-hook and in the transmission state, and power supply is stopped at other times. To do.

That is, loop detecting means for detecting on-hook or off-hook of each terminal, transmission detecting means for detecting the transmitting state or non-transmitting state of each terminal, and off-hook and off-hook by the loop detecting means and the transmitting detecting means. Switch means for supplying power to a transmission system corresponding to the terminal when a transmission state is detected, and for stopping power supply to the transmission system when an on-hook or non-transmission state is detected. And

[0011]

When a certain terminal is off-hooked to form a DC loop with the present concentrator and further transmission from that terminal is performed, power is supplied to the transmission system corresponding to that terminal. Even if the terminal is off-hook, power is not supplied to the transmission system unless reception is performed and transmission is not performed.

For example, when the terminal is a telephone, the power of the transmission system is turned off while listening to the other party, and the power is supplied to the transmission system when the user speaks.

[0013]

Embodiments of the concentrator according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a concentrator according to the present invention.

In the figure, the concentrator of this embodiment accommodates n channels C1 to Cn, and a telephone set T is provided for each channel.
Signal lines 1 to Tn are connected.

Each telephone is provided with a switch 2 indicating on-hook / off-hook. For example, when the telephone T1 is off-hook and the switch 2 is turned on, a direct current loop is formed with the corresponding channel C1 of the concentrator 1. .

In the channel C1 of the line concentrator 1, the signal line of the telephone set T1 is connected to the 2-line / 4-line hybrid circuit 3 and further connected via the receiving system circuit 4 and the transmitting system circuit 5 to the multiprocessing system. It is connected to the circuit 6.

One of the two-line signal lines of the telephone T1 is connected to the power source, and the other line is connected to the loop detection circuit 7
Connected to. When the switch 2 of the telephone T1 is turned on, a direct current flows from the power source to the signal line, whereby the loop detection circuit 7 detects that the telephone T1 is off-hook and closes the switch S1.

The loop detection circuit 7 and the switch S1 may be composed of a relay circuit or the like composed of windings and contacts. Alternatively, the switch S1 may be configured by a transistor or the like, and a detection signal from the loop detection circuit 7 may be input to implement the on / off operation.

The transmission signal from the 2-line / 4-line hybrid circuit 3 is input to the transmission system circuit 5 and the transmission detection circuit 8. The transmission detection circuit 8 detects and rectifies the transmission signal, determines from the level whether or not the transmission state is present, and closes the switch S2 if the transmission state is established. The speech detection circuit 8 and the switch S2 can also be configured by a relay circuit or the like or a transistor circuit.

The transmitter circuit 5 is connected to a power source via switches S1 and S2 connected in series. The switch S1 is closed in the transmitting state, the switch S2 is connected to the telephone T1.
Close when is off-hook. Otherwise,
Both switches are open.

The other channels have the same structure as the channel C1.

Next, the operation of this embodiment will be described by taking the channel C1 as an example. The operation of other channels is similar.

First, when the telephone set T1 is in the on-hook state, the switch S1 is opened by the loop detection circuit 7, so that power is not supplied to the transmitter circuit 5. Since power is supplied to the reception system circuit 4, normal reception operation is performed.

When the telephone T1 is taken off-hook, a DC loop is formed, and the loop detection circuit 7 causes the switch S1.
Closes.

Subsequently, when a voice signal is input from the telephone T1 and a voice transmission signal appears at the voice transmission system output of the hybrid circuit 3, the voice transmission detection circuit 8 closes the switch S2.
As a result, power is supplied to the transmitting system circuit 5 through the switches S1 and S2, and the transmitting signal is transmitted to the multiplex processing system 6 by the operation of the transmitting system 5, is subjected to multiplex processing and is transmitted to the private branch exchange or the like through the central office line. It

When the other party's voice is heard without utterance, the switch S2 is opened by the utterance detection circuit 8, so that the power supply to the utterance system circuit 5 is stopped, and the utterance is started again.

That is, power is supplied to the transmitting system only when the telephone is off-hook and talking is being performed. In other states, no power is supplied. By such an operation, useless power consumption can be avoided.

[0029]

As described above in detail, in the concentrator according to the present invention, when a terminal is off-hook and transmission is performed from the terminal, power is supplied to the transmission system corresponding to the terminal, and other than that. In this state, since power is not supplied to the transmission system, low power consumption can be achieved.

In particular, in a portable and mobile type concentrator which uses a battery as a power source, the battery life can be extended, and the usefulness and economy are improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a line concentrator according to the present invention.

FIG. 2 is a schematic configuration diagram showing an example of a digital exchange system having a concentrator.

[Explanation of symbols]

 1 line concentrator 2 on-hook / off-hook switch 3 2-wire / 4-wire hybrid circuit 4 reception system circuit 5 transmission system circuit 6 multiple processing system circuit 7 loop detection circuit 8 transmission detection circuit

Claims (5)

[Claims] 1. A concentrator that collects signal lines of a plurality of terminals and has at least a reception system and a transmission system corresponding to each of the plurality of terminals, comprising: loop detection means for detecting on-hook or off-hook of each terminal. , Transmission detection means for detecting the transmission state or non-transmission state of each terminal, and when the off-hook and transmission state are detected by the loop detection means and the transmission detection means, power is supplied to the transmission system corresponding to the terminal And a switch means for stopping the power supply to the transmission system when an on-hook or non-transmission state is detected, and a concentrator. 2. A concentrator for concentrating signal lines of a plurality of telephones, a loop detecting means for detecting an on-hook or an off-hook of each of the telephones, and a transmission detection for detecting a transmitting or non-transmitting state of each of the telephones. Means, a first switch means for closing a contact when an off-hook of any telephone is detected by the loop detection means, a first switch means connected in series, and a transmission state of the telephone by the transmission detection means. A second switch means that closes the contact when is detected, and a transmission system provided corresponding to the telephone and connected to a power source through the first and second switch means. Concentrator to do. 3. The concentrator according to claim 2, wherein the loop detection means and the first switch means are relay circuits. 4. A concentrator that collects signal lines of a plurality of telephones and has at least a receiving system and a transmitting system corresponding to each of the plurality of telephones, and a loop detection circuit for detecting on-hook or off-hook of each telephone. A transmission detection circuit for detecting a transmission or reception state of each telephone, and a switch connected between the transmission system and a power source corresponding to each telephone, the loop detection circuit and the transmission According to the detection signal from the talk detection circuit, when any one of the telephones is in the off-hook state and the transmitting state, the switch is closed to supply power to the transmitting system corresponding to the telephone, and the telephone is in the on-hook state or the receiving state. At the time of, the switch is opened to stop the power supply to the transmitting system corresponding to the telephone, and the concentrator. 5. The switch comprises a first switch and a second switch connected in series, the first switch being opened and closed by a detection signal from the loop detection circuit,
4. The concentrator according to claim 3, wherein the switch is opened / closed by a detection signal from the transmission detection circuit.