JP2002204466A - Signal conversion trunk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal conversion trunk that can accommodate a synchronous command terminal to an existing exchange. SOLUTION: When the signal conversion trunk A receives start information of a line circuit interface sent from the exchange 1, the signal conversion trunk B transmits start information of a synchronizing system signal from a synchronizing system signal transmission circuit 12 to a synchronizing command terminal 3 and the synchronous command terminal designated by the exchange 1 side is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a signal conversion trunk, and more particularly to a signal conversion trunk for accommodating a synchronous command line in an exchange.

[0002]

2. Description of the Related Art An example of a conventional command telephone system is disclosed in Japanese Patent Laid-Open No. 57-054461. The command telephone system includes a line control unit for controlling a command line, as disclosed in Japanese Patent Application Laid-Open No. 57-054461,
A signal transmission starting circuit for transmitting a signal is provided, and a commander performs a simultaneous group call to a command terminal of a called subscriber. This type of command telephone system is developed exclusively for a synchronous command terminal, and a synchronous command terminal is also used for a connected command terminal.

[0003]

As described above, since the conventional command telephone system has been developed exclusively for the synchronous command, as described above, a system dedicated to the synchronous command is required to control the synchronous command terminal. is there. Therefore, in order to accommodate a synchronous command terminal in an already installed exchange, a system must be newly constructed for each user, and there is a problem in that equipment costs are increased.

Further, in order to accommodate command lines of different types in a command telephone system developed exclusively for synchronous commands, there is another problem that a line control unit for each type must be newly developed.

Furthermore, the conventional command telephone system does not have a synchronous command terminal and a backup function when a line abnormality occurs, so that there is a problem in that maintenance response in the event of a failure is delayed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a signal conversion trunk capable of accommodating a synchronous command telephone system in an existing exchange at low cost. And

Another object of the present invention is to provide a signal conversion trunk which can be accommodated in an existing exchange even with a command telephone system constructed with a command line other than the synchronous type.

It is another object of the present invention to provide a signal conversion trunk which can be switched to a backup line when a failure occurs in a command telephone system to be accommodated.

[0009]

SUMMARY OF THE INVENTION The present invention is a signal conversion trunk which is connected between an exchange and a synchronous command system in which a plurality of synchronous command terminals are branch-connected to a synchronous command line. It converts the line circuit interface signal received from the exchange into a synchronous signal and sends it to the synchronous command system, and converts the synchronous signal received from the synchronous command system into a line circuit interface signal and sends it to the exchange. It is characterized by the following.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a switching system using the signal conversion trunk of the present invention. The existing exchange 1 accommodates a synchronous command line via the signal conversion trunk 2 of the present invention, and transmits and receives transmission / reception signals and the like to and from a plurality of synchronous command terminals 3 branch-connected to the synchronous command line. I do. In addition, each synchronous command terminal 3
Are connected to the signal conversion trunk 2 in a star by a backup line.

FIG. 2 is a block diagram showing the configuration of the first embodiment of the present invention. The signal conversion trunk 2 is a circuit for converting the synchronous signal of the synchronous command terminal 3 and the line circuit interface of the exchange 1, and includes a signal conversion trunk A4 for interfacing with the exchange 1 and a synchronous command line. And a signal conversion trunk B8 which takes an interface.

The signal conversion trunk A4 includes an interface (INT) circuit 5 and a port microprocessor (P
M) A circuit 6 and a control (CONT) circuit 7 are provided. I
The NT circuit 5 receives the start information of the line circuit interface from the exchange 1 and sends a start signal to the PM circuit 6, and receives an incoming instruction from the PM circuit 6 and sends the incoming information of the line circuit interface to the exchange 1. Transmission function. The PM circuit 6 controls communication between the INT circuit 5 and the CONT circuit 7. The CONT circuit 7 is a PM circuit 6
Has a function of transmitting an activation signal to the signal conversion trunk B in accordance with an instruction from the terminal, and a function of receiving synchronous command terminal incoming information from the signal conversion trunk B8.

The signal conversion trunk B8 is a CODEC.
The circuit includes circuits 9 and 11, an input output (I / O) circuit 10, a synchronous signal transmission circuit 12, and a PB signal reception (PBREC) circuit 13. The CODEC circuits 9 and 12 convert an audio signal transmitted and received after setting a communication path from an analog signal to a PCM signal or from a PCM signal to an analog signal. The I / O circuit 10 has a function of receiving an activation signal from the signal conversion trunk A4 and activating the synchronous signal transmission circuit 12, and a function of receiving incoming information from the synchronous command terminal 3 and receiving incoming information to the signal conversion trunk A4. Is provided. The synchronous signal transmission circuit 12
In accordance with the start instruction from the / O circuit 10, the start information of the synchronous signal is transmitted to each synchronous command terminal 3. PBREC
The circuit 13 receives the response P sent from each synchronous command terminal 3.
B signal is received, and each synchronous command terminal 3
And performs switching processing to the backup line upon detecting an abnormality in the backup line.

Next, the operation of this embodiment will be described in detail with reference to the drawings. When the exchange 1 activates the synchronous command terminal 3, the exchange 1 sends to the signal conversion trunk 2 the activation information of the line circuit interface including information for identifying the synchronous command terminal 3 to be activated. The signal conversion trunk 2 receives the activation information of the line circuit interface transmitted via the PM bus of the exchange 1 by the INT circuit 5. Then, the INT circuit 5 sends a start signal to the PM circuit 6 to notify that the start information has been received from the exchange 1.

The PM circuit 6 having received the activation signal sends an activation instruction to the CONT circuit 7 to activate the synchronous command terminal 3 specified by the activation information. The CONT circuit 7
An activation signal is sent to activate the signal conversion trunk B8. When receiving the activation signal via the I / O circuit 10, the signal conversion trunk B8 instructs the synchronous signal transmission circuit 12 to transmit synchronous signal activation information. The activation information of the synchronous signal is received by each synchronous command terminal 3, and the designated synchronous command terminal 3 is activated.

Next, an incoming operation from the synchronous command terminal 3 to the exchange 1 will be described. After the incoming PB signal from the synchronous command terminal 3 is received by the PBREC circuit 13, the I / O circuit 10
Send to The I / O circuit 10 that has received the incoming signal of the synchronous signal determines that the incoming information has been
The ONT circuit 7 is notified. The CONT circuit 7 which has received the notification of the reception information transmits a reception signal to the PM circuit 6.
The PM circuit 6 having received the incoming signal issues an incoming instruction to the INT circuit 5, and the INT circuit 5 sends out incoming information of the line circuit interface to the exchange 1 via the PM bus.

Next, the status monitoring of the synchronous command terminal 3 and switching to the backup line will be described. The synchronous signal transmission circuit 12 always transmits an FSK signal to a synchronous command line. When each synchronous command terminal 3 receives the FSK signal transmitted from the synchronous signal transmitting circuit 12,
The response PB signal is always returned to the REC circuit 13. PBR
If the response PB signal is not returned from the synchronous command terminal 3 within a preset time, the EC circuit 13 regards the synchronous command terminal 3 as having an abnormality and sends alarm information to the exchange 1. And I of signal conversion trunk B8
The / O circuit 10 switches the connection with the synchronous command terminal 3 in which the abnormality has occurred to a backup line. Thereafter, the synchronous command terminal 3 in which the abnormality has occurred transmits / receives transmission / reception information to / from the exchange 1 via the backup line.

FIG. 3 is a block diagram showing the configuration of the second embodiment of the present invention. In the embodiment shown in FIG.
In addition to the configuration shown in FIG. 1, an F-type signal transmission circuit 14 for transmitting an F-type signal, a DTMF type signal transmission circuit 15 for transmitting a DTMF type signal, a synchronous signal transmission circuit 12, an F-type signal transmission circuit 14, and A switching (SEL) circuit 16 for switching the DTMF signal transmission circuit 15 to connect to the command line is provided, and is configured to accommodate a plurality of types of command lines.

[0019]

The first effect is that by accommodating the synchronous command terminal in the exchange already installed, the equipment cost can be reduced when the system is constructed. The reason is that the function of converting the synchronous signal into the line circuit interface of the exchange is provided in the signal conversion trunk.

The second effect is that even a command telephone system constructed with a command line other than the synchronous type can be accommodated in an existing exchange. The reason is that a signal transmission unit for transmitting a plurality of signals having different signal types is provided.

A third effect is that the state of the synchronous command terminal and the line are monitored, and the maintenance is improved by switching to the backup line when a failure occurs. The reason is that the signal conversion trunk is provided with a function of monitoring the status of the synchronous command terminal and switching the backup line.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a connection mode according to the present invention.

FIG. 2 is a block diagram illustrating an internal configuration of a signal conversion trunk according to the first embodiment.

FIG. 3 is a block diagram illustrating an internal configuration of a signal conversion trunk according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 switch 2 signal conversion trunk 3 synchronous command terminal 3 4 signal conversion trunk A 5 interface circuit 6 port microprocessor circuit 7 control circuit 8 signal conversion trunk B 9 CODEC circuit 10 input / output circuit 11 CODEC circuit 12 synchronous signal Transmission circuit 13 PB signal reception circuit 14 F-type signal transmission circuit 15 DTMF-type signal transmission circuit 16 Switching circuit

Claims (4)

[Claims] 1. A synchronous command system in which a plurality of synchronous command terminals are connected to a synchronous command line by branching a synchronous command line, and converts a line circuit interface signal received from the switch into a synchronous signal. And transmitting the signal to the synchronous command system, converting the synchronous signal received from the synchronous command system into a line circuit interface signal, and transmitting the signal to the exchange. 2. A first signal conversion trunk connected to an exchange, and a second signal conversion trunk connected to a synchronous command system in which a plurality of synchronous command terminals are branch-connected to a synchronous command line. The first signal conversion trunk comprises: an interface unit for transmitting and receiving a line circuit interface signal to and from the exchange; a control unit for transmitting and receiving a control signal to and from the second signal conversion trunk; A microprocessor for controlling communication of a control unit, wherein the second signal conversion trunk receives a synchronous signal from the synchronous command system, and transmits a control signal to and from the first signal conversion trunk. It has an input / output unit for transmitting and receiving, and a synchronous signal transmitting unit for transmitting a synchronous signal to the synchronous command system in accordance with an instruction from the input / output unit. Signal conversion trunks, characterized in that. 3. A first signal conversion trunk connected to an exchange, and a second signal conversion trunk connected to a command system in which a plurality of command terminals are branch-connected to a command line; The signal conversion trunk includes an interface unit that transmits and receives a line circuit interface signal to and from the exchange, a control unit that transmits and receives a control signal to and from the second signal conversion trunk, and communication control of the interface unit and the control unit. A second input / output unit for receiving a transmission signal from the command system and transmitting / receiving a control signal to / from the first signal conversion trunk; and a signal type. Any one of a signal transmitting unit that transmits a plurality of signals different from each other, and a signal transmitted from the signal transmitting unit in accordance with an instruction from the input / output unit. Select one, signal conversion trunks; and a switching unit for outputting to the command system. 4. The plurality of command terminals are connected in a star shape to the second signal conversion trunk by a backup line, and when an abnormality of any one of the plurality of command terminals is detected, 4. The signal conversion trunk according to claim 2, wherein the command terminal performs communication via the backup line.