JPH0549064A - Private line exchange system - Google Patents

Abstract

PURPOSE:To install a communication equipment having a telephone terminal interface and an office line trunk without a switch circuit as an opposite station through a private line of a digital line interface. CONSTITUTION:A 2nd communication equipment incorporating telephone terminal interfaces 119,120 and office line trunks 121, 122 is connected o a 1st communication equipment 104 in a private branch exchange 101 incorporating telephone terminal interfaces 107, 108, office line trunks 109, 110, a switch circuit 102 and a central controller 103 are connected via a high speed digital line 114. Since the communication equipment 116 having no switch circuit is connected as an opposite station of a private line, the inexpensive private line exchange system with a small capacity is provided and the interconnection between a public line and the private line is easily realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange, and more particularly to a private line exchange system.

[0002]

2. Description of the Related Art In a conventional private branch exchange, when private line connection is performed as shown in FIG.
Are connected via a high-speed digital line 225 and a high-speed digital line multiplexer (DMP) 223, 224, and the digital trunk (DTR) 20 is used as the interface.
7,208 were housed. Further, each private branch exchange 201, 202 has a switch circuit 209, 210 and a terminal interface (TIF) 211, 212, 21.
3,214 and local line trunk (LTR) 215,216,
217 and 218 are accommodated in the terminal interface 21.
1, 212, 213 and 214 are telephone terminals 219 and 22
0, 221, 222, and the office line trunk 215,
216, 217, and 218 were connected to the central office line.

At this time, when a dedicated line is connected, for example, the telephone terminal 219, the terminal interface 211, the switch circuit 209, the digital trunk 207, the high-speed digital line multiplexers 223 and 224, and the high-speed digital line 22.
The central controller 205, 206 controls the operation of connecting to the telephone terminal 220 through the digital communication trunk 5, the digital trunk 208, the switch circuit 210, and the terminal interface 212.

[0004]

However, such a conventional private line exchange system requires two or more exchanges having a switch circuit. For example, when a network is constructed by using a private line, an extension line is used. There is a problem that the use efficiency of the switch circuit is deteriorated when the number is small.

[0005]

In order to solve the above-mentioned problems, the present invention comprises the following means. That is, in a private branch exchange having a terminal interface for connecting an analog terminal or a telephone terminal having a data function or a telephone terminal having no data function, a station line trunk, and a digital line interface for connecting to a high-speed digital line, the main body of the private branch exchange is Means for accommodating the voice signal and the data communication signal outputted from the switch circuit and the telephone terminal control signal and the office line trunk control signal outputted from the central control unit, which are accommodated in the casing of
A digital line interface for connecting to the second communication device, means for separating the multiplexed voice signal and data communication signal from the second communication device, the telephone terminal control signal and the office line trunk control signal, A first communication device having a switch circuit and means for inputting a signal to a central control device; a digital line interface for connecting to the first communication device via a high-speed digital line; and multiplexing from the first communication device. Means for separating the voice signal and the data communication signal from the telephone terminal control signal and the office line trunk control signal, a plurality of terminal interfaces and a plurality of office line trunks for connecting the separated signals, a plurality of telephone terminal interfaces and a plurality of Voice signal and data communication signal from a local trunk line, telephone terminal control signal, and central line trunk control signal And a second communication device having a means for multiplexing the.

[0006]

Therefore, the second communication device having the telephone terminal interface and the office line trunk is connected to the inside of the private branch exchange having the telephone terminal interface, the office line trunk, the switch circuit, and the central control unit through the high-speed digital line. By connecting to the first communication device, a device having no switch circuit can be installed as an opposite station of a private branch exchange having the switch circuit in the leased line connection.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the relay system diagram of FIG. In FIG. 1, a private branch exchange 101 includes a switch circuit 102, a central control unit 103, terminal interfaces (TIFs) 107 and 108, and a trunk line trunk (L).
TR) 109, 110 and the first communication device 104 are accommodated, the telephone terminals 111, 112 are provided in the terminal interfaces 107, 108, the office line is provided in the station line trunks 109, 110, and the first communication device 104 is provided in the first communication device 104. A second communication device 116 is connected via high-speed digital line multiplexers (DMP) 113 and 115 and a high-speed digital line 114.

The first communication device 104 and the multiplexer / demultiplexer 105 and the digital line interface (D
IF) 106. Also, the second communication device 116 is a digital line interface (DIF) 11
7, the multiplexer / demultiplexer 118, and the terminal interface (T
IF) 119, 120 and local line trunk (LTR) 12
1, 122, and a terminal interface 119,
Telephone terminals 123 and 124 are provided at 120 and a trunk line trunk 1
An office line is connected to the terminals 21 and 122.

Next, the operation will be described. The central control unit 103 connects the telephone terminals 111, 112 and the trunk lines 109, 110 via the switch circuit 102 and the terminal interfaces 107, 108, and the first communication unit 104, the high-speed digital line multiplexers 113, 115 and the high speed. The telephone terminals 123 and 124 and the office line trunks 121 and 122 are controlled via the digital line 114 and the second communication device 116, and, for example, the connection between the telephone terminal 111 and the telephone terminal 123, the telephone terminal 112 and the office line trunk 121. And the line trunk 109 and the telephone terminal 124 are connected.

Since there is no switch circuit inside the second communication device 116, the telephone terminal 123 and the office line trunk 121 are once connected to each other via the high speed digital line 114 and the switch circuit 103 of the private branch exchange 101. To connect. Further, the telephone terminal 111 is a terminal interface 10
7, via the switch circuit 102, the first communication device 104, the high-speed digital line 114, the second communication device 116, and the office line trunk 121, to the office line in the charging area where the second communication device 116 is installed. Can be connected.

As described above, according to this embodiment, the telephone terminal interfaces 119 and 120 and the office line trunk 121,
The second communication device 116 having the built-in 122 is connected to the telephone terminal interface 10 via the high-speed digital line 114.
A private branch exchange 1 incorporating 7, 108, office line trunks 109, 110, a switch circuit 102, and a central control unit 103.
01 to the first communication device 104. As a result, the second communication device 116 having the telephone terminal interfaces 119 and 120 and the station line trunks 121 and 122 and having no switch circuit can be installed as a game by using the dedicated line of the digital line interface 117.

[0012]

As described above, according to the present invention, the second communication device incorporating the telephone terminal interface and the office line trunk is provided with the telephone terminal interface, the office line trunk, the switch circuit, and the central circuit via the high-speed digital line. By connecting to the first communication device in the private branch exchange containing the control device, it becomes possible to install a device having no switch circuit as an opposite station of the private branch exchange having the switch circuit in the private line connection. Therefore, it is possible to provide a low cost private line exchange system in a small capacity area. In addition, there are practical advantages such as easy realization of interconnection services between public and private lines.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a relay system for explaining an embodiment of the present invention.

FIG. 2 is a configuration diagram of a relay system according to a conventional example.

[Explanation of symbols]

101 private branch exchange 102 switch circuit 103 central control device 104 first communication device 105, 118 multiplexing / demultiplexing device 106, 117 digital line interface (DI
F) 107, 108, 119, 120 Terminal interface (TIF) 109, 110, 121, 122 Central line trunk (LT)
R) 111, 112, 123, 124 Telephone terminal 113, 115 High-speed digital line multiplexer (DM)
P) 114 high-speed digital line 116 second communication device

Claims (1)

[Claims] 1. A terminal interface for connecting an analog telephone terminal, a digital telephone terminal having a data communication function, or a digital telephone terminal not having a data communication function, a station line trunk, and a digital line interface for connecting to a high-speed digital line. In the private branch exchange, means for multiplexing the voice signal and the data communication signal output from the switch circuit and the telephone terminal control signal and the central line trunk control signal which are housed in the main body of the private branch exchange. A digital line interface connected to the second communication device, means for separating the multiplexed voice signal and data communication signal from the second communication device from the telephone terminal control signal and the office line trunk control signal, Means for inputting signals to the switch circuit and the central controller A first communication device having the same, a digital line interface connected to the first communication device via a high-speed digital line, a multiplexed voice signal and data communication signal from the first communication device, a telephone terminal control signal, and a station. Means for separating line trunk control signals;
Multiple terminal interfaces and multiple office line trunks that connect separated signals, voice signals and data communication signals from multiple telephone terminal interfaces and multiple office line trunks, telephone terminal control signals, and office line trunk control signals And a second communication device having means for multiplexing, the leased line switching system.