JP2792093B2 - Remote line method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote line system, and more particularly to a remote line system in a case where a distance between a distributed processing type time-division exchange and a terminal device accommodated therein is long. .

[Conventional technology]

FIG. 3 is a system block diagram showing an example of a conventional remote line system, in which an exchange main unit (SWE) 1 'is connected through a digital trunk interface (DTI) 16.
And a remote device (hereinafter referred to as RMT) 10 'are connected to the digital transmission
Connected by SWE1 'is a processor (CP
U) 2, time-division switch (TSW) 3, remote line control circuit (LNC) 17, DTI16.
It is connected to SW3 and LNC17 through the control bus 4. On the other hand, R
The MT 10 'comprises a remote device control circuit (hereinafter CTL) 18, a DTI 16, a concentrator circuit (hereinafter referred to as CON) 20, a plurality of line circuits (hereinafter referred to as LC) 21, and a telephone (hereinafter referred to as T) 14 connected thereto. The control leads 19 are connected between CTL10, CON20 and LC21.

A call from T14 connecting to RMT10 'is detected by LC21,
The call information reaches the CTL 18 through the control lead 19. Here, if the CON 20 is not in the call blocking state, the calling information reaches the LNC 17 from the DTI 16 of the SWE 1 ′ through the digital transmission line 9 using the specific channel of the DTI 16. CPU 2 receives the call information from LNC 17. When the called party responds, the CPU 2 controls the TSW 3 to specify the channel of the digital transmission line 9 and the LNC 1
A connection instruction is issued to CON 20 through 7 and CTL 18 to establish a communication path.

[Problems to be solved by the invention]

In this conventional remote line system, a digital trunk interface and various control circuits are added after a line circuit is provided in the remote device, which not only increases hardware costs, but also increases service levels due to an increase in the number of control layers. There was also a problem that also occurred.

[Means for solving the problem]

According to the present invention, there is provided a distributed processing time-division exchange having a processor for controlling an entire switching system and a microprocessor for controlling a subscriber circuit, a remote device for interfacing with a terminal device, and a remote device and a digital transmission line. The remote device comprises a digital code / decoder for each subscriber circuit, and a multiplex circuit for multiplexing / demultiplexing data transmitted / received to / from the digital transmission line. The remote line system is characterized in that the exchange main unit includes the processor, the microprocessor connected to the processor, and a multiplexing circuit for multiplexing / demultiplexing data transmitted / received between the digital transmission line. can get.

〔Example〕

Next, the present invention will be described with reference to FIGS.

FIG. 1 is a system block diagram showing an embodiment of a remote line system according to the present invention, and FIG. 2 is a block diagram showing a basic configuration of a general distributed processing type time division switch.

As shown in FIG. 2, in a general distributed processing type time-division exchange, a processor (hereinafter referred to as CPU) 2 includes a control bus 4.
Controls the time division switch (hereinafter, TSW) 3 and the line circuit (hereinafter, LC) 15. The LC 15 has a built-in microprocessor (hereinafter referred to as MPU) 6 for controlling a line circuit, and the MPU 6 has a telephone interface (hereinafter referred to as TIF) 13.
Control.

When the call from T14 is confirmed by the MPU 6 through the TIF 13, the MPU 6 creates the call information,
Notify U2. CPU2 controls TSW3 and MPU6 of LC15
To call processing. When the MPU 6 executes the call processing, T14 transmits the digital code / decoder (hereinafter C) of TSW3 to LC15.
A dial tone is provided through ODEC 12 and TIF 13.

In one embodiment of the remote line system of the present invention,
As shown in FIG. 1, a remote line interface (hereinafter referred to as RLI) 5 accommodated in the SWE1 is provided with the function of the LC15 in FIG.
It is divided and installed in a remote device (hereinafter referred to as RMT) 10 connected to this through a digital transmission line 9. That is, on the SWE1 side, there is an RLI 5 having an MPU 6 controlled by the CPU 2 through the control bus 4, and a multiplexing circuit (hereinafter referred to as a multiplexing circuit) for demultiplexing control information output from the MPU 6 and digital signals transmitted and received between the TSW 3
MUX) 7 and a transmission line interface (TRK) 8 for interfacing with the digital transmission line 9. On the other hand, the RMT 10 performs TRK8 for transmitting and receiving signals input and output from the digital transmission line 9, the MUX 11 for demultiplexing the digital signal from the TSW3 and the control signal, and encoding and decoding of the digital signal transmitted and received between the TSW3. And TIF13 interfacing with T14, and the digital signal between TSW3 is
Control signals are input / output to / from the TIF 13 through the ODEC 12 and to / from the TIF 13.

 Next, the operation of this embodiment will be described.

The call from T14 is detected by TIF13, and the control signal
X11, TRK8, reach RLI5 through digital transmission line 9, MUX7
The control signal is extracted at and is input to the MPU 6. The MPU 6 creates call information and notifies the CPU 2 of the call information. The call processing instruction from CPU2 is sent to MUX7, TRK8, digital transmission line 9, TR by MPU6.
Execution is instructed to TIF 13 through K8 and MUX11. Also, TSW3
Digital signal from the RLI5 through MUX7, TRK8, digital transmission line 9, and RMT10 through TRK8, MUX11, CODEC12, TIF13.
Give 14 a dial tone.

〔The invention's effect〕

As described above, the present invention is directed to a distributed processing type time-division exchange having a processor for controlling the entire switching system and a microprocessor for controlling the subscriber's circuit. The remote device comprises a digital code / decoder for each subscriber circuit and a multiplex circuit for multiplexing / demultiplexing data transmitted / received to / from the digital transmission line. The exchange main unit includes a processor, a microprocessor connected to the processor, and a multiplex circuit for multiplexing / demultiplexing data transmitted / received to / from a digital transmission line, that is, a line circuit having a microprocessor. Function is divided into two, and a functional block having a microprocessor is exchanged. By installing a function block having a telephone interface in the remote device and in the remote device, a telephone set in a remote place that cannot be directly connected from a subscriber accommodated in the exchange main body is accommodated, and the exchange main unit is accommodated. Can provide service functions equivalent to those of telephones accommodated in these remote telephones,
In addition, since the remote device does not have a concentrator or a special control circuit, the above functions can be realized at low cost.
This has the effect of providing the same services as those of the line circuit directly accommodated in the exchange main unit while minimizing hardware costs.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of a remote line system of the present invention, FIG. 2 is a block diagram showing a basic configuration of a general distributed processing type time division switch, and FIG. 3 is a conventional remote line system. FIG. 3 is a system block diagram showing an example of the system. 1 ... Switch body (SWE) 2 ... Processor (CP
U) 3, ... time division switch (TSW), 4 ... control bus,
5 Remote line interface (RLI), 6
Microprocessors (MPUs), 7, 11 ... Multiple circuits (MUs)
X), 8: Transmission line interface (TRK), 9: Digital transmission line, 10: Remote device (RMT), 12: Digital encoder / decoder (CODEC), 13: Telephone interface (TIF), 14: Telephone (T), 15: Line circuit (LC).

Claims (1)

(57) [Claims] 1. A distributed processing time-division exchange having a processor for controlling an entire switching system and a microprocessor for controlling a subscriber circuit, a remote device for interfacing with a terminal device, and the remote device connected to the remote device through a digital transmission line. The remote device comprises a digital code / decoder for each subscriber circuit, and a multiplex circuit for multiplexing / demultiplexing data to be transmitted / received to / from the digital transmission line. A remote line system comprising: a main exchange unit including the processor, the microprocessor connected to the processor, and a multiplexing circuit for multiplexing / demultiplexing data transmitted / received to / from the digital transmission line.