JPH03149994A - Exchange processing system - Google Patents

Abstract

PURPOSE:To shorten a connection time and to improve a maintenance property by executing all outgoing/incoming processings by transmitting and receiving a PB signal through a speech line. CONSTITUTION:When an outgoing side transmits a PB signal A, an incoming side detects an incoming, and a path is connected to an incoming side terminal. When the incoming side terminal answers, a PB signal B is transmitted from the incoming side, the outgoing side detects the answer of the incoming side and becomes a second connecting state, and a speech can be executed. Subsequently, when the speech is ended, a PB signal C is transmitted from the outgoing side, the incoming side disconnects the path to the incoming side terminal, and also, transmits a PB signal D as a release-guard signal to the outgoing side, and the outgoing side becomes a first connecting state. In such a way, by executing all the outgoing/incoming processings by transmitting and receiving the PB signal, the connection time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching processing system, and more particularly to a switching processing system in a leased line trunk accommodated in an automatic switchboard.

[Conventional technology]

Conventionally, in leased line trunks, signal lines (DL line, R
G2 line) control allows you to make and receive calls, check connections, and select callers (
However, in the case of a PB signal, a telephone line was used) and response connection processing and recovery processing were performed.

[Problem to be solved by the invention]

In the conventional leased line trunk switching process described above,
Each time a call occurs, it is necessary to control the operation of the relay of the DL line, which is a signal line, and to scan the status of the RG2 line, so that connection processing and recovery processing take time.

[Means to solve the problem]

The switching processing method of the present invention connects to the opposing switch through a signal line and a call line, and starts when the signal line is on.
A voice call is made by transmitting and receiving various control signals meaning selection, response, and recovery through the telephone line using a PB signal, and transmitting and receiving a line monitoring signal through the telephone line using a PB signal when the signal line is on. The configuration is such that the occurrence of a line failure is monitored, and when a line failure is detected, the on/off state of the control line is monitored to detect recovery from the line failure.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIG. 1, which illustrates one embodiment of the present invention, the leased line trunk shown is provided in an out-of-band dialing trunk of a switch. The control circuit 10 transmits and receives information to and from the control section of the exchange via a control interface circuit 14, and relays 13.
A photocoupler 11 connected to the second signal line (RG2) via a current limiting resistor 12. PB sender 8 that sends PB signals
, a PB receiver 9 and a PB sender 8 that receive PB signals.
The audio signal from the switch of the exchange, which controls the operation of the output selector switch 1, is sent to the selector switch 1, buffer amplifier 2. The signal is transmitted to the sending side of the communication line via the source resistor 4 and transformer 5.

The voice signal or PB signal from the receiving side of the telephone line is a transformer 7, a terminating resistor 6. The signal is input to the PB receiver 9 via the buffer amplifier 3 and is also transmitted to the switch of the exchange. The control circuit 10 performs the calling/receiving procedure shown in FIG.
It is equipped with a program that processes the line monitoring procedure shown in the figure.

The calling/receiving procedure shown in Figure 2 is based on the first and second signal lines (D
This is executed with the DL line on and the RG2 line on (first connection state) by controlling the L line and RG2 line, and the following signals are defined by the combination of the PB signals.

PB signal A...Activation and selection signal PB signal B...Response signal PB signal C...Recovery instruction signal PB signal D...Recovery completion signal First, when the calling side sends the PB signal A, the called side Detects incoming calls and connects a path to the called terminal.

When the terminal on the called side responds, the called side transmits a PB signal B, and the calling side detects the response on the called side and enters the second connection state, allowing a call. Next, when the call ends, the calling side sends a PB signal C, and the called side disconnects the path to the called terminal, and sends a PB signal C to the calling side as a recovery completion signal. 1 connection status.

The line monitoring procedure shown in FIG. 3 is controlled by the combination of the first and second signal lines and the next PB signal on the speech line.

PB signal E... Line monitoring instruction PB signal F... Line monitoring response The first line monitoring is performed by sending and receiving PB signals, and in the first connection state, the calling side sends the PB signal E, When the receiving side receives the PB signal E, it replies with the PB signal F, and if there is no fault in the line, the alarm is restored and this operation is repeated. Here, the calling side sends the reply PB signal F after sending the PB signal E. If not received, an alarm is detected as a line failure, and the process moves to the second line monitoring. Further, if the receiving side does not receive the PB signal E for a long time, an alarm is detected. The second line monitoring is performed by controlling the control line, and if the calling side detects an alarm in the first line monitoring, the DL line is turned off (relay 13 is inactive). The receiving side detects that the corresponding RG2 line is turned off (the photocoupler 11 is inactive) and then turns off the DL line (at this time, the receiving side enters an alarm detection state).

As a result, the transmitting side also detects that the RG2 line is off. Next, when the calling side turns on the DL line, the called side detects that the RG2 line is on, and when the called side turns on the DL line, the calling side detects that the line fault has been recovered by turning on the RG2 line. Then, the process moves to the first line monitoring. Note that if the calling side cannot detect that the RG2 line is turned on, it is determined that the line failure has not been recovered, and the second line monitoring is repeated.

〔Effect of the invention〕

As explained above, according to the present invention, all call processing is performed by transmitting and receiving PB signals via the telephone line.
Connection time can be shortened. Additionally, since the line status is constantly monitored, it is also excellent in terms of maintainability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing processing procedures in the same embodiment.

1... Selector switch, 2.3... Buffer amplifier,
4...Tooth resistor, 5.7...Transformer, 6...Terminal resistor, 8...PB sender, 9...PB receiver,
10... Control circuit, 11... Photocoupler, 12...
- Current limiting resistor, 13... Relay, 14... Control interface circuit.

Claims (1)

[Scope of Claims] 1. Connected to the opposing exchange through a signal line and a telephone line, and when the signal line is on, various control signals meaning activation, selection, response, and recovery are transmitted and received through the telephone line using a PB signal. to conduct a voice call, and when the signal line is on, a line monitoring signal is transmitted and received through the communication line using a PB signal to monitor the occurrence of a line failure, and when a line failure is detected, the control line is switched on. A switching processing method characterized by detecting line failure recovery by monitoring on and off states. 2. A switching processing system characterized in that the control function according to claim 1 is provided in a private line trunk.