JPS5839149A - Four-wire bridge cut off system - Google Patents

Abstract

PURPOSE:To make the tripartite two-way service possible, by using a hybrid coil in the offering trunk of a four-wire exchange. CONSTITUTION:In a four-wire exchange having channels T (transmission) and R (reception), hybrid coils HYBA and HYBB are provided in an offering trunk OFFT. When a subscriber C breaks in between speaking subscribers A and B, subscribers A, B, and C speak to one another in two directions through a four- wire trunk A, a trunk B, and the offering trunk OFFT.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interrupt connection scheme in a four-wire switched connection.

The conventional 411-type interrupt connection system is an extension of the two-wire interrupt connection system, and is a system that simply configures a communication path.

For example, as shown in FIG. 1, when a call is in progress between KA and 8, the trunk TRK and TaN2 are connected between T (sending) and R (receiving), and calls can be made in both directions between A and 8. If C interrupts M in this state, the conventional method would simply configure a communication path between M and C, so the trunk TR
T and 8 are connected between KA and trunk TRKC,
Although calls can be made in both directions between A and 0, the trunks 'I', RKB, and 'rRKC' are connected between r-T and RH, and calls between B and 0 cannot be made. That is, the conventional interrupt call system has the drawback that even if a call can be made with one party, it is impossible to talk with the other party, resulting in an irregular three-party call.

SUMMARY OF THE INVENTION An object of the present invention is to provide a four-wire interrupt connection system that allows two-way communication between three parties.

This is a four-wire interrupt connection system characterized by using hybrid coils in each of the two-way communication paths of the interrupt trunk of the present invention, and performing three-way communication in both directions.

Next, an embodiment of the present invention will be described with reference to FIG. Referring to FIG. 3, the current and current coils are built into the interrupt trunk 0FFT. IfiA, 8
This shows a case where C enters the conversation between 8 and 8 and interrupts the conversation between 8 and 8. If C interrupts the call between A and 8, trunk T
R, KC are interrupt trunks 0FFT and T-R, R-
Connected between T.

Trunks TRKA and TRKB are interrupt trunks 0FFT.
and TCTRKA)-R(TRKB)-T/RA(OFF
T).

R(TRKA) -T(TRKB)-T/RB(OFF
T) is connected between. In this case, C's call is T(TRKC
)-R((P-FT)-AMPBO-HYBB-
T/RB (OF'FT) -via R (TAKA)-
1”lc), T('I'RKC) -R(OF'
FT) -AMPAO-HYBA-T/FLA(0FF
It also connects to B via T)-R (TRKB). A
The call is transmitted to B via T(TRKA)-R(TRKB), and T(TRKA)-T/R&(OFFT)-H
YBA-AMPAI-T(OFFT)-R(TRKC)
It also connects to C via. Furthermore, B's call is T (TRKB
)-R (TRKA) and connects to people via 'I' (TRKA).
KB)-TβB(OF'FT)-HYBB-AMPBI
-T(0FFT) Also connects to C via -R(TRKC).

That is, A by using a hybrid coil.

Two-way communication between parties B and C is possible.

As explained above, the present invention enables two-way communication between three parties in a four-wire switching connection by using a hybrid coil as an interrupt trunk.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram showing a conventional 4-wire exchange connection state, Fig. 2 is a 4-wire interrupt connection diagram when the state shown in Fig. 1 is interrupted, and Fig. 3 is a 4-wire interrupt connection according to the present invention. It is a system diagram. 0FFT is the interrupt trunk, AMPAO, AMPAI. AMPBO, to MPBt is amplifier dB for level adjustment.
A. HYB is high puri, tocoil.

Claims (1)

[Claims] A 4-meter interrupt connection hole that uses a hybrid cable in each of the two-way communication paths of the interrupt trunk of the four-wire switched connection to perform two-way three-way interrupt calls.