JPS6028428B2 - Forced disconnection method of transmitting station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for forcibly disconnecting a transmitting station when all lines are busy during inter-station communication.

Conventionally, when forcibly disconnecting a line when all lines are busy in a bush between offices, it has been necessary to use a forced disconnection trunk separate from a normal outgoing trunk. This had the disadvantage that it was not possible to increase the variety of trunks and make the exchange machine more economical. The present invention aims to improve the above-mentioned drawbacks, namely, to provide a forced disconnection system in which the line is forcibly disconnected at the originating station from a trunk used for normal connections, without providing a dedicated forced disconnection trunk.

Therefore, in the present invention, when the number of busy outgoing trunks for each route exceeds a certain number in the forced disconnection storage device of the calling station, the location of the outgoing trunks that have become busy since then is stored in advance, and all lines are disconnected. In this case, when a forced disconnection code of a subscriber in a class where forced disconnection is possible is received, the busy calling trunk accommodation position is extracted from the storage device. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a relay system diagram according to the present invention, and FIG. 2 is a detailed circuit diagram of the forced disconnection storage device shown in FIG. 1.

First, in FIG. 1, the subscriber SUBA is connected to the originating trunk OGT by communication path 1 of the exchange of the originating station, and via the terminating trunk ICT of the terminating station.
Assume that you are talking to UBB.

In this state, when the calling party SUBC dials the called party SUBB or the called party number of a called party (not shown), the calling party SUBC hears a busy tone if all lines are busy. When the calling party SUBC confirms the busy tone and hangs up the handset, calls again for forced disconnection and dials the forced disconnection code and called party number, the central controller CC It identifies that the class is in a class where forced disconnection is possible, extracts the busy call trunk accommodation position stored in advance in the forced disconnection storage device PRIM, and disconnects the busy call trunk OGT.
A forced disconnection warning sound WT is sent to the subscriber SUBA from the call path SW.
, is sent for a certain period of time through ■. Next, after a certain period of time, the central controller CC starts the switch controller SWC,
The communication path SW, (2) between the subscriber SUBA and the outgoing trunk OGT is forcibly disconnected, and the central controller CC restores the outgoing trunk OGT.

After a certain period of recovery timing, the central controller CC activates the terminating station from the restored outgoing trunk OGT, and the sender O
Capture and activate S. The sender OS sends the called party number and forced disconnection class information from the outgoing trunk OGT to the terminating station via the communication path SW, (2). The central controller CC also controls the communication path SW. of the caller SUBC and the outgoing trunk OGT. Activate and connect the switch control device SWC. On the other hand, at the receiving station, the incoming trunk ICT corresponding to the OGT is also forcibly restored, and a reconnection operation to SUBB is performed via the communication path SW2 by a known method. Furthermore, if the called subscriber at the terminating station is a subscriber not shown in the figure and is free, connection is made in the same manner as above, and if the subscriber is currently on a call via a trunk, etc. not shown in the figure. Central control device C
C to send forced disconnection information to the called party.
Next, FIG. 2 shows a specific circuit of the forced disconnection storage device shown in FIG. 1, and the details thereof will be explained below.

In FIG. 2, the busy counters 0 to 127 BYCTO to 127 of the forced disconnection storage device PRIM of the originating station are selected by the address decoder ADDR by specifying the route from the central controller CC, and are counted by the central controller CC. Add or subtract the number of mid-word outgoing trunks for each route with an up pulse or a countdown pulse. When the number of busy calling trunks exceeds a certain number, the outputs of the set reset decoders 0 to 12 and RDRO to 127 are output from the busy calling trunk by logical product with the busy calling trunk accommodation position set pulse from the central controller CC. Storage position memory OG
Open the TT write gate.

Then, the busy call trunk accommodation position memory OGTT stores the busy call trunk accommodation position corresponding to the route by being designated with the memory address and the busy call trunk accommodation position by the central control unit CC. In addition, when the number of busy outgoing trunks is less than a certain number, the outputs of the set/reset decoders 0 to 12 and UDRO to 127 are output to the central controller C.
The clear gate of the busy calling trunk accommodation position memory OGTT is opened by AND with the busy calling trunk accommodation position clear pulse from C.

The busy call trunk accommodating position memory OGTT releases the busy call trunk accommodating position corresponding to the route by designating a memory address from the central control unit CC. Therefore, when the central controller CC specifies the busy call trunk read pulse, forced disconnection possible class pulse, and memory address, the busy call trunk accommodation position memory OGTT outputs the busy call trunk accommodation position to the central controller CC. do.

In this way, the outgoing trunk to be forcibly disconnected is identified. An embodiment of the present invention has been described above.According to the present invention, the forced disconnection storage device of the originating station includes a trunk busy counting circuit for each route and a means for storing information on the location of the outgoing trunk after the trunk is busy. By providing this, it is possible to secure a line by simply making calls from callers in the forcibly disconnectable class wait for a certain period of time and dialing again.

Therefore, forced disconnection can be performed using a normal outgoing trunk without providing a required forced disconnection trunk.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram of the present invention, and FIG. 2 is a circuit diagram of a forced disconnection storage device on the transmitting station side shown in FIG. 1. PRIM...forced disconnection storage device, CC...central control unit, BYCTO~127...counting circuit (counter), OGTT...storage means. Rare illustration N ship

Claims (1)

[Claims] 1. In connections between different telephone exchanges, a class that can be forcibly disconnected when all lines are busy The forced disconnection storage device that stores the caller's outgoing connection has a busy counter corresponding to the outgoing route and an outgoing trunk that has become busy. If the number exceeds a certain number, a means is provided for storing the location of the outgoing trunk that has become busy after that for each route, and when all the lines are busy, the caller can forcibly disconnect the caller. Upon receiving the code and the called party number, extracts the storage location information stored in the storage means, and after transmitting a forced disconnection warning sound for a certain period of time,
A method for forcibly disconnecting a calling station, which is characterized by forcibly disconnecting a busy calling trunk, forming a communication path between the calling party and the calling trunk, and reconnecting the called station after a certain period of time.