JPS5821987B2 - Subscriber circuit disconnection control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subscriber circuit disconnection control method in an exchange.

Generally, when the subscriber circuit of an exchange accommodates a trunk for incoming calls, an interrupt link, etc., the subscriber circuit is disconnected by cutting the wiring at the subscriber circuit entrance of the communication line.

The operation for a test call will be explained with reference to FIGS. 1, 2, and 3.

FIG. 1 is a relay system diagram when an automatic response trunk AAT for a test call is accommodated in one subscriber circuit of a line link frame LIF.

FIG. 2 is a circuit diagram for explaining the operation of the automatic response trunk AAT.

FIG. 3 is a time chart for explaining the operation of the automatic response trunk AAT.

In Figure 1, the test number from another station (standard number "259")
9") is received by the called party's trunk ICT, the central control unit (not shown) determines that it is an incoming call, and if the automatic answering trunk AAT is empty, it sends the automatic answering trunk AAT and the ringing signal trunk RGT along the route (■). The called party's trunk IICT and the ringing trunk RBT are connected to the calling side through the route (3).

Next, in FIG. 2, when the automatic response trunk AAT and the ring trunk RGT (not shown) are connected, the B line battery from RGT - the B line of AAT - RBPO - R1 - B relay - earth IJ relay works.

Next, due to the arrival of the ringing signal (RG) from the ringing trunk RGT, AAT's A line - 201 contact (break) - bO
The R relay operates through the path of contact (make) - R relay - earth.

Then, the ICIJ relay operates due to the operation of the B and R relays.

When the calling signal is disconnected, the R relay is restored and the 2C relay is activated.

Furthermore, when the second ring tone is received from the ring trunk RGT, the RIJ relay is activated again, and the ICIJ relay is restored.

When the second ring signal is disconnected, A line - 2c' contact (make) - 10 point (break) - r1 contact (break)
-REPl-A relay (primary winding) -RO-A relay (
A direct current loop circuit is formed by the path: secondary winding) - REPO - B line - RGT.

When this ring trip is detected by the calling signal trunk RGT (point A in FIG. 3), the calling signal trunk RGT is displayed on the scanning circuit SCN (not shown).

A central control unit (not shown) reads and identifies this information and determines that it is a response from the automatic response trunk AAT.

When the central control unit detects a response from the automatic answering trunk AAT, it connects the automatic answering trunk AAT and the called party's trunk ICT through the route ◯ in FIG.

When the automatic answering trunk AAT is connected to the called party's trunk ICT, the automatic answering trunk AAT's A IJ signal is activated by the loop circuit having the power supply of the called party's trunk ICT. is sent to the calling party via the following route.

DT - a3 contact (make) - R3 - RBPl - ground air 1
When the calling party hears the dial tone from the automatic answering trunk AAT, it is determined that the test is successful, and the calling party puts down the telephone.
The central controller reads and identifies the scanning circuit SCN of the called party's trunk ICT, determines that the test is completed, and disconnects the communication path between the automatic response trunk AAT and the called party's trunk ICT (■ in FIG. 1).

This disconnection causes the automatic response trunk AAT to
C relay is restored and becomes empty.

The test call described above is a case in which an automatic response trunk AAT is accommodated in a subscriber circuit, and the subscriber circuit is disconnected by cutting the wiring in advance to obtain normal operation.

FIG. 4 is a circuit diagram illustrating the principle of disconnecting the subscriber circuit by cutting the wiring.

Here, a case will be described in which an automatic response trunk AAT is accommodated in a subscriber circuit.

First, a test number from another station is received on the called party's trunk ICT.

A central control unit (not shown) determines that the automatic answering trunk 7AAT is an incoming call, and if the automatic answering trunk AAT is empty, connects the automatic answering trunk AAT and the ringing trunk RGT.

When both trunks are connected, the subscriber circuit's L RIJ relay operates on the next route.

Line A from RGT - Line A1 from TLF - A2 from LLF
Line = LLF A3 wire - T-44-〇 terminal - T-54-F
Terminal - LR relay - battery.

L The status is displayed to the scanning circuit SCN by the RIJ signal.

A central control unit (not shown) reads and identifies the scanning circuit SCN and reads that the subscriber is in a calling state.

Thereafter, the dial tone trunk ORT is connected to receive dialed digits from the calling party.

Furthermore, the busy tone trunk BTT (which transmits the busy tone) is connected due to a timeout, and invalid operations are repeated, which adversely affects the call processing of the exchange.

Also, the B line battery-T via the ringer trunk RGT
There is a risk that the resistance of the ringer trunk RGT may be burnt out due to excessive current in the path of LF's B1 line - 1LLF's B2 line - LLF's B3 line - T-45-R terminal - T-55-E terminal - Earth. .

Therefore, when accommodating a trunk for incoming calls, an interrupt link, etc. in a subscriber accommodating circuit, the subscriber circuit is disconnected by cutting the wiring at the subscriber circuit inlet.

In Figure 4, when disconnecting the subscriber circuit,
Accommodating terminal of the relevant subscriber circuit, e.g.; T-44-
Disconnect the wiring between CT-54-F and T-45-D-T-55-E.

The number of wires to be cut is two per subscriber.

For example, there are usually about 4 subscriber circuits with cut wiring per grid unit (64 subscribers).
; 256 circuits per line link frame unit (4096 subscribers).

Here, a method for disconnecting subscribers by cutting the wiring will be explained.

The connector accommodating the subscriber circuit is pulled out from the grid plate (a device that enables connection between the subscriber circuit and the communication line by relaying the connector), and the accommodating terminal T of the subscriber circuit is pulled out.
-44-C-T-54-F and T-45-D -T-
The wiring between 55-E was cut and the connector was inserted into the grid plate again.

This method requires high workability, and there is a risk that incorrect cutting of the wiring may cause the wiring of other subscriber circuits to be cut, resulting in frequent failures and lack of reliability.

Furthermore, if the subscriber circuit inlet is made cuttable, the number of wires increases, so it is usually fixed and lacks flexibility.

The present invention eliminates these drawbacks and provides an economical and highly reliable subscriber circuit disconnection control system.

FIG. 5 is a circuit diagram showing an embodiment of the subscriber circuit disconnection control method according to the present invention.

In FIG. 5, TYP is a typewriter, DCH is a data channel, CC is a central control unit, MEM is a storage device,
SD is subscriber data, SRD is information reception and distribution device, SC
R is the channel drive register, SC is the channel drive device, CM
CM IJ relay PO is a contact point of the POIJ relay (not shown) that operates according to subscriber accommodation, G is a gate, LR is a subscriber relay, and CMC0N shown by a broken line is a disconnection control unit.Subscriber data SD is stored in the storage device of the exchange. The data is stored in the MEM using a typewriter TYP.

That is, this is done by inputting operating instructions (commands) to the exchange from a typewriter.

For example, 1￥b is also FNC&P, P2 as a command format.
P3P, P5〆” is used.

The meaning of each symbol is listed in a table. Therefore, function code FNC specifies disconnection as subscriber circuit control, and parameter P.

~P5 creates subscriber data of the subscriber number that accommodates the incoming trunk, interrupt link, etc. by providing the subscriber telephone number and a bit for operating the cut-off magnet CM included in the subscriber circuit. , type in.

The state of the subscriber data SD is stored in the storage device MBM.

A case where this subscriber receives a call from another station will be explained.

In FIG. 5, when a test number from another station is received by the called party's trunk ICT (not shown), the central controller CC determines that the call is an incoming call, and stores the called subscriber's incoming call information (called subscriber data) from the storage device MEM. Extract and analyze incoming calls.

If a normal connection is possible, the incoming call analysis determines that it is a calling connection for the called subscriber, and the ringing trunk RBT is connected to the called party's trunk ICT to send the ringing tone to the subscriber at the previous station, and the automatic answering trunk AAT is connected. A ringing signal trunk RGT is connected to (see FIG. 1).

On the other hand, if the subscriber circuit is to be disconnected by reading the subscriber data at this time, the command sent from the central control unit CC via the communication line address bus 5PAB, that is, the communication line control information, is transmitted via the cable receiver CR. It is stored in the reception distribution device SRD.

The information receiving and distributing device SRD decodes the device designation information (designating the channel driving device SC) in the channel control information and distributes it to the channel driving register SCH.

A channel drive register SCR provided one-to-one with the channel drive device SC sends channel control information to the channel drive device SC.

Then, the CM IJ relay of the subscriber circuit is restored according to the switch control order of the communication path control information.

That is, the disconnection control between the telephone line and the subscriber circuit is performed by controlling the disconnection control unit CMC0N of the network control device comprising the information reception and distribution device SRD, the communication path drive register SCR, the communication path drive device SC, and the like.

The specific recovery of the CM relay is as follows.

By sending a signal to the gate G from the channel drive device SC, the gate G becomes conductive, and the operation of the PO relay (not shown) causes the CM IJ relay P of the earth-subscriber circuit to become conductive.
The CMIJ relay that was mechanically maintained is restored through the O contact (make) - gate G (ON) - battery path.

CM IJ relay is restored and its contact cm0. cm' is used to disconnect the subscriber circuit starting circuit, that is, the communication line and the subscriber circuit.

Note that if you want to use a subscriber number that accommodates a trunk for incoming calls, an interrupt link, etc. as a general subscriber, you can cancel it by inputting a cancellation designation using the above-mentioned command.

As described above, according to the present invention, if the disconnection control of the subscriber circuit is performed by the network control device, the disconnection control of the subscriber circuit can be easily performed without the need for fixing the subscriber by wiring, and the workability can be improved.

[Brief explanation of drawings]

1 and 2 are circuit diagrams for explaining connection control of automatic response trunks, FIG. 3 is a time chart for automatic response trunks, and FIG. 4 is a circuit diagram for explaining disconnection of conventional subscriber circuits. FIG. 5 is an embodiment of a circuit diagram illustrating a subscriber circuit disconnection control system according to the present invention. SRD...Information reception and distribution device, SCR...
...Call path drive register, SC...Call path drive device, CM...CM relay, -G...
Gate, LR... Cut entry relay.

Claims (1)

[Claims] 1. When accommodating subscriber telephones in the network, when accommodating incoming call-only trunks, interrupt links, etc. other than subscriber telephones on the subscriber side, use a network control device to control the separation of telephone lines and subscriber circuits. A subscriber circuit disconnection control method characterized by: