JPS5847112B2 - Interrupt connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interrupt connection system for a subscriber line that is in use from a toll subscriber in a subscriber line time division switching system.

As shown in Fig. 1, a conventional subscriber line time division switching system includes subscribers (SUB) A and B, a power subscriber circuit (LC) 1, a line concentration switch (LSW) 2, and an encoder/decoder (CODEC). )
3, 8, Outgoing trunk (OCT) 4, Trunk for long-distance operator (ICT-VER) 5, Trunk for champion calls (TW
T) 6. Time division switch network (NW)? ,have.

Also, although not shown, the out-of-town board member is designated as C.

Next, a conventional interrupt connection method in the above system configuration will be explained.

Now, the powerless people A and B and the powerless person A-the powerless person circuit 1-
While talking on the route of concentrator switch 2-encoder/decoder 3-switch network 7-encoder/decoder 8-outgoing trunk 4-subscriber B, subscriber A from toll subscriber C
When there is an incoming call, a call route bus is set up as shown by the broken line in the figure, and subscriber A, outgoing trunk 4 (return person B)
, and the trunk 5 for the toll operator (toll operator C) are connected to the trunk 6 for three-way calls.

This three-way call trunk 6 has a function that allows the toll board operator C to monitor calls between subscriber A and subscriber B, and a function that allows the toll board operator C 75 to monitor calls between subscriber A and subscriber B. It has a function that allows a call to be made by interrupting a call from a long-distance caller, and a method has been adopted in which the interrupt connection is made by intermediating a trunk 6 for a three-party call.

Generally, the subscriber circuit shown in the figure has a circuit for connecting communication lines for the subscriber's road side and the exchange side, respectively, for testing purposes.

According to this conventional method, when making an interrupt connection from a long-distance board member, a trunk for three-way communication and an accompanying encoder/decoder are required, and the bus during the call also requires this type of connection. There is a need to frequently change the connection to the telephone trunk, which is a problem both economically and in terms of program control.

For the purpose of the present invention, a test lead-in circuit having a function of simultaneously drawing in each of the call lines on the subscriber line side and the exchange side in the subscriber circuit is used to connect the toll board to the subscriber line during a call. The purpose of this method is to allow more interrupt connections to be made, simplify the trunk for three-way calls that was previously used, and at the same time reduce the number of encoders and decoders, and also eliminate the need for connection switching that was required in the conventional system. The object of the present invention is to provide an interrupt connection method that is more economical and easier to control.

According to the present invention, in a subscriber line time-division exchange having a test lead-in circuit that has the function of pulling the call lines on the subscriber line side and the exchange side into the subscriber circuit, The interrupt connection call from the outside board member is connected to the lead-in side of the test lead-in circuit of the subscriber line's power line subscriber circuit, and through the lead-in circuit, the out-of-home board member can:
An interrupt connection system is obtained, which is characterized in that it is possible to monitor the call status of the subscriber line or to make an interrupt call.

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

FIG. 2 shows an embodiment of the present invention, in which a subscriber (SU
B) A, B, subscriber circuit (LC) 1, line concentration switch (L
SW) 2, encoder/decoder (CDEC) 3, 8, outgoing trunk (OCT) 4, outbound trunk (ICT-)
VER) 5, time division switch network (NW) 7,
The out-of-town board member C is the same as that shown in FIG.

In addition, the contact point t of the relay of the test lead-in circuit in the subscriber circuit, the connector circuit (CONU) 10 between the subscriber circuit 1 and various test circuits, and the trunk for three-way communication (TW
T) 11 and a test circuit (TSTE) 12.

However, the test circuit 12 is shown to clarify the systematic position of the three-party call trunk 11 in the present invention, and will not be described here.

That is, the trunk 11 for three-way communication is connected to the connector using one of the terminals on the test circuit accommodating side of the connector between the power source circuit 1 and the test circuit 12; Meanwhile, as shown in the figure, the terminals of the three-way trunk 11 are connected to the time division network 7 via an encoder/decoder 13.

Combined inputs A and B are separated by the path of subscriber A - subscriber circuit 1 - concentrator switch 2 - encoder/decoder 3 - network 7 - encoder/decoder 8 - outgoing trunk 4 - subscriber B. When subscriber A receives an incoming call from toll operator C from toll operator's trunk 5 while in a telephone call state, first, the call is sent to subscriber A from toll operator trunk 11 and toll operator via network 7. The operator's trunk 5 is connected, and the subscriber circuit 1 of subscriber A and the trunk 11 for three-way communication are connected via a connector circuit 11.

On the other hand, the contact point t of the test lead-in circuit in the subscriber circuit 1
operate at the same time.

This three-way call trunk 11 connects subscriber A's call path through the T-relay and connector circuit 10, and monitors the call status of long-distance board member C75 assistant person C and connects subscriber A and B. This is a trunk circuit that has the function of interrupting a call and making a three-party call, and by setting the above-mentioned call path for incoming calls from long-distance callers, C (handler)
is now able to interrupt a call between subscribers A and B via the three-party call trunk 11.

Furthermore, since the three-party call trunk 11 has only one interface with the encoder/decoder 13, it can be configured with a simpler trunk than the three-party call trunk used in the conventional system.

As mentioned above, by allowing an interrupt call from a long-distance caller to arrive at a three-way trunk that has only one terminal for the network, the operator can make a call using the three-way trunk. Since monitoring and interrupting calls are possible, the number of encoders and decoders connected to the trunk for three-way calls seen in conventional systems can be reduced, and when a call from a long-distance caller is received, the existing call route can be It is also possible to avoid replacing the connections.

The present invention As explained above, by connecting an interrupt connection call from a long-distance caller to a test lead-in circuit of a long-distance caller's circuit through the three-way call trunk necessary for the present invention, a regular call can be made. Economical effects can be obtained by simplifying the trunk, reducing the number of encoders and decoders, eliminating complexity in program control by eliminating connection changes, and ultimately reducing program memory.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram showing a conventional interrupt connection, and FIG. 2 is a relay system diagram showing an embodiment of the present invention. A, B...Subscriber telephone (STB), 1...
Loop saving circuit (LC), 2... Subscriber line concentrator switch (LSW), 3, 8, 13... Encoder
Decoder (CODEC), 4--outgoing trunk (OGT)
, 5...... Trunk for out-of-home car operator (ICT-V)
ER), 11...Three-party call trunk (TWT)
), 7... Open time division switch network (UW), 1
2...Tune test equipment (TSTE), t...Test switching circuit relay contact, C...Outside board operator.

Claims (1)

[Claims] 1. In a power line time-division exchange that includes a test lead-in circuit having a means for simultaneously drawing in both the subscriber line side and the exchange side talking lines, from the toll board operator to the subscriber line during a call. connects the interrupt connection call of the subscriber line to the drop-in side of the test drop-in circuit of the subscriber circuit of the subscriber line, and monitors the call status of the subscriber line or makes the interrupt call via the drop-in circuit. Features an interrupt connection method.