JPH01144844A - Dispatcher telephone system - Google Patents

Abstract

PURPOSE:To reduce the number of lines of transmission line by using a common signalling channel for calling signal as a transmission line in addition to a channel. CONSTITUTION:A signal conversion circuit 22 on the exchange 2-side converts a signal from a slave telephone set 3 to a calling signal to a master telephone set 1. When the exchange 2 ends the connection to the master telephone set 1, the circuit 22 on the exchange 2-side transmits a signal corresponding to the number of the slave telephone set 3 which is calling to a signal line 5. On the side of the slave telephone set 3 on caller-side, the connection is completed by a signal conversion circuit 32, a signal control circuit 31, and a switching circuit, etc. Thus the two-way call between the calling slave telephone set 3 and the master telephone set 1. In such a way, by using the common signalling channel for calling signal as a transmission line in addition to the channel, the number of lines of transmission line can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a command telephone system, and more particularly to a command telephone system in which a master station issues commands to a plurality of slave stations.

[Conventional technology]

Conventionally, this type of command telephone system has been configured with a master telephone, an exchange, a transmission line, and a slave telephone. Although the actual operating line is one call path, there are as many transmission line lines (call lines) as there are slave phones.
have.

FIG. 2 is a block diagram showing an example of a conventional command telephone system.

In FIG. 2, the ""r, 7r, 7 conventional communication system is an exchanger 20 that connects the main power packer 10 via a signal control circuit 21a.
is connected to six transmission lines 4o, each of the six transmission lines 40 is connected to a signal control circuit 313, and each signal control circuit 31a is connected to a child telephone 3o.

The conventional command telephone system of this example has the following three types of functions.

(1) - Simultaneous command telephone function: A function that connects the master telephone 10 and all the slave telephones 30 by selecting the function on the master telephone 10 side, and enables one-way calls from the master telephone 10 to the slave telephones 30. .

(2) Individual command telephone function... Depending on the function selection on the main telephone 10 side, the main telephone 10 and a specific 1 reserve telephone 30
A function that enables two-way communication between the parent phone 10 and a specific child phone 30.

(3) Call function by making a call from a slave phone...
A function that connects the slave telephone 30 and the master telephone 10 by a calling signal from the slave telephone 30 and enables two-way communication between the slave telephone 30 and the master telephone 10.

[Problem to be Solved by the Invention 3] In the conventional command telephone system explained above, as shown in FIG.
The slave telephone 30 is controlled by the signal control circuit 21a of the slave telephone 30 and the signal control circuit 31a of the slave telephone 30 side, but since the other party is always one specific person when viewed from the slave telephone 30, the slave telephone 30 is similar to a shared telephone type. something is being used. In addition, the signal control circuits 21a and 3 on the exchange 20 side and slave phone 30 side, respectively.
In order to maintain the state of each function by detecting on/off of the calling signal, 1a must avoid buffering of the calling signal between slave telephones 30, and therefore the transmission path 40 (speech path) is - One line (call route) is required for each slave phone 30, and if there are many slave phones 3o, the line (call route) is equal to the number of slave phones 30, even though the actual operating line is one line (call route). The disadvantage is that a road must be provided.

[Means for solving problems]

In the command telephone system of the present invention, an exchange connected to a master telephone is connected to a plurality of slave telephones via a transmission line. a first signal conversion circuit for converting into a corresponding signal, and the transmission path includes one common line signal path for the calling signal and one communication path for command voice connected to the first signal conversion circuit. a second signal conversion circuit that terminates the common line signal path and converts a signal corresponding to a telephone number from the master telephone into an incoming call signal; a signal control circuit that controls the connection of the slave phone to the call path by a signal and selects a slave phone to be connected to the call path by detecting the timing of a call signal from the slave phone; and a switching circuit that terminates the communication path and connects the communication path to the target slave telephone in response to a control signal from the signal control circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, this embodiment includes an exchange 2 that connects the main telephone 1 via a signal control circuit 21, a signal conversion circuit 22 that connects to the exchange 1, and a signal that connects the main phone 1 to the exchange 2 via the signal conversion circuit 22. circuit 5 and signal conversion circuit 22
A voice line 4 that connects to the exchange 2 via a signal conversion circuit 32 that terminates the signal line 5, a switching circuit 33 that terminates the voice line and accommodates the slave telephone 3, and a signal conversion circuit. A signal control circuit 31 that controls the switching circuit 33 by transmitting and receiving signal information with the slave telephone 32 and transmitting and receiving signal information with the slave telephone 3, and a signal line 5 and a voice line for connecting to other slave telephones (not shown). It has a branch circuit 6 and a branch circuit 7 connected to the line 4.

The signal conversion circuit 22 is a circuit that converts a calling signal based on earth contact information from the main phone 1 into a predetermined number for the slave phone 3, and is used to communicate within the signal line 5 with a signal corresponding to the phone number. belongs to. For example, in the case of digital signals, communication is performed using coded pulse signals, and in the case of analog signals, communication is performed using a combination of multifrequency signals.

Similarly, the signal conversion circuit 32. :C2]j is a circuit that converts a calling signal from the child telephone 3 into a signal corresponding to a telephone number.

Next, the operation of each function of this embodiment will be explained.

- Operation in the case of simultaneous command telephone When a calling signal for a simultaneous command is issued from the master telephone 1, the exchange 2 which received it from the signal control circuit 21 notifies the signal conversion circuit 22 that it is a simultaneous command. When the signal conversion circuit 22 sends the special number of the simultaneous command to the signal line 5,
The signal conversion circuit 32=Shishi 1 and signal control circuit 31' on each slave telephone 3 side determines that it is a -same command telephone, disconnects the transmission circuit (not shown) of the voice line 4, and receives the signal. A command to connect the circuit (not shown) and connect the slave telephone 3 side is sent to the switching circuit 33, and the switching circuit 33 connects each slave telephone 3.
is connected to the voice line 4 to enable one-way communication from the parent telephone 1 to the slave telephone 3.

■ Operation in the case of an individual command telephone When a calling signal is issued from the parent telephone 1 to a specific slave telephone 3, the signal conversion circuit 22 on the exchange 2 side sends a signal to the signal line 5 corresponding to the number of the specific called slave telephone 3. sends a signal to A signal conversion circuit 32, a signal control circuit 31, and a switching circuit 33 that accommodate a specific called slave telephone 3 connect the transmitting circuit and receiving circuit of the voice line 4 to the specific called slave telephone 3, and connect the main telephone 1 and Two-way communication between called slave telephones 3 is enabled.

■ Operation when a call is made by a call from a slave phone - When a call signal is issued from the slave phone 3 to the base phone 1, the signal control circuit 31 transmits the call signal from the slave phone 3 housed in the switching circuit 33. Select the slave phone 3 that sent the
The switching circuit 33 is operated to establish connection with the audio line 4 via the transmitting circuit and the receiving circuit. The signal conversion circuit 32 sends a signal corresponding to the number of the slave telephone 30 that made the call to the signal line 5.

A signal conversion circuit 22 on the side of the exchange 2 converts the signal from the slave telephone 3 into a calling signal for the master telephone 1. When the exchange 2 terminates the connection with the master telephone 1, the signal conversion circuit 22 on the exchange 2 side sends a signal corresponding to the number of the slave telephone 3 that made the call to the signal line 5.

On the side of the slave phone 3 on the calling side, a signal conversion circuit 32° and a signal control circuit 31. The switching circuit 33 and the like complete the connection, allowing two-way communication between the slave telephone 3 that made the call and the master telephone 1.

〔Effect of the invention〕

As explained above, the present invention uses a common line signal line for calling signals in addition to the communication line as a transmission line, thereby making it possible to transmit connection control signals between a parent phone and slave phone over the common line signal line. Therefore, the number of transmission lines can be reduced compared to the conventional method, and the efficiency of use of communication lines can be increased, resulting in the construction of an economical system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional command telephone system. 1... Main telephone, 2... Switchboard, 3.
...Slave phone, 4...Voice line, 5.
...Signal line, 6゜7...Branch circuit,
], O... Main phone, 21, 21a...
・Signal control circuit, 22...Signal conversion circuit, 30
...Slave telephone, 31, 31a...Signal control circuit, 32...Signal conversion circuit, 33...
...Switching circuit, 40...Transmission line. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a command telephone system in which an exchange connected to a master telephone is connected to a plurality of slave telephones via a transmission line, the exchange transmits a first signal that converts a calling signal from the slave telephone into a signal corresponding to a telephone number. a conversion circuit, the transmission path has at least one set each of a common line signal path for the calling signal and a communication path for command voice connected to the first signal conversion circuit; a second signal conversion circuit that terminates a common line signal path and converts a signal corresponding to a telephone number from the master phone into an incoming call signal; a signal control circuit that controls connection to the telephone line and selects a slave telephone to be connected to the telephone line by detecting the timing of a calling signal from the slave telephone; and a signal control circuit that terminates the telephone line; and a switching circuit that connects the communication path to the target slave telephone according to a control signal from the telephone.