JPS59105724A - Back-up device of data circuit - Google Patents

Abstract

PURPOSE:To obtain a simple and miniature back-up device of the terminal side by ensuring the back-up of a circuit and a modulator/demodulator just by an operation of the center side with no transfer of a special control signal. CONSTITUTION:When a data circuit 4 has a fault, a circuit switching part 2 of the center side is switched to the exchange circuit side. Then a circuit 11 (2-wire type) of the terminal side is called out by a dial operation. An incoming deciding part 7 of the terminal side detects the incoming from the circuit 11 and sends back an incoming tone after. Then a circuit 12 (2-wire type) is called out from the center side to have the same operation. The part 7 decides the incoming order between the circuts 11 and 12 (the circuit back-up is defined in the case of circuits 11 12). Based on the result of this decision, a circuit switching part 6 of the terminal side is switched to the exchange circuit side. The back-up is recovered when no signal exists for a fixed time or longer after detecting the modulated signal sent from the center side by the part 7.

Description

[Detailed Description of the Invention] This Takuma is a data recollection and backup device f VCl'! in case of failure of the modem. It is something to do JJ.

Conventionally, this 4111 backup device has a 2-same transmission/reception unit for control signals for controlling the backup k flilJ in addition to the backup line.

The present invention uses the 2nd 4th exchange] back line as a backup line, and the arrival/1g1 rectification of the exchange line.
,・,I'm going to pick it up. ,J: Is it a line backup?

Modification, backup of J device or full identification s l1jlJ
By filling, tfi on the center side
Transmission signal of lJ example signal - tryS.

This is a data line backup device that eliminates the need for a receiving section on the terminal side.

The present invention provides means for fully determining the order of incoming calls on one of the backup lines of the two lines on the terminal side, means for switching off the line or modem according to the '14I determination result, and It consists of a means for detecting the presence or absence of a signal QJ according to the reception rule, a means for measuring the duration of the presence or absence of the performance, and a means for causing a backup function to be activated when no signal continues for a certain period of time as a result of the measurement. Ru.

Next, the implementation sequence of this bracket will be explained with reference to the drawings.

In the diagram, 1.2 is center 1! 6-11.1: All devices on the terminal side are installed. 4 represents a data line (four-wire system) connecting them, %3, and 51 represent the interchange IS equipment fi1 of a backup switching line. In the figure, a case will be explained in which backup on the terminal side is automatically performed by an operation on the center side.

First, when the data center 4 becomes a department, the operation of backing up the data center 4 will be explained step by step.

Center (1 jl line open rH < 2 Switch to full-time chivalry line side, turn terminal ffl!l by dial operation;)
Call signal 11 (2-wire system). The M damage determination unit 7 on the terminal side detects all signals from 11, completes a loop, and then returns a 1M message tone. Next, the center side calls line 12 (two-wire type) and performs the same operation r'. In the incoming call determination section, the R call 111i'4n of times 11 and 12 is fully determined, and when this chant 11 → 12 is defined as a backup of 1 four lines (set as 7), the l1ll terminal side is determined by the determination result. The line switch 6 is switched to the gland side.

The line backup operation is now complete. To restore the backup, the modulated signal from the center is sent to the incoming call determination unit 7.
By detecting from rC, if there is no signal for a certain period of time or more, the backup will be fully restored.

Next, backup of the modem will be explained later. When the modem 8 becomes out of order.

Calls are made from the center side in the order of lines 12 and 11. At this time,
The line switching unit 2 does not see the cut. The N1 judgment unit 7 performs a complete judgment on the stuck/1d order, switches the modem switch-off unit IO, and sets the modem 9 on the primary 11N side to the working side, and at the same time,
Arrival 1g Judgment I 1 7 Execution switching completion sound All returned, times + 1g
Release 11 and 12.

As explained above, the present invention allows line backup and modem backup to be performed only from the center side without transmitting or receiving special control signal 1g, so the backup device on the terminal side can f77'
It has the advantage of being small and easy to use.

[Brief explanation of the drawing]

The figure is a system diagram showing a real gun ill according to the present invention. 1... Center side modem Minato 1st station, 2... Line switching unit, 3... Father calling device I, 4... Data circuit I gland, 5...・Switching device, 6...Line switching unit, 7...J'f' is flaw determination unit, 8゜9...
Terminal side modulation/demodulation device (current use, backup), 10... Modulation/demodulation device 1 group switching bar B.

Claims (1)

[Claims] A means for completely determining the arrival order of the two backup lines at the terminal l1llI, a means for completely disconnecting either the line or the modem according to the request for such determination, and a means for completely disconnecting either the line or the modulation/demodulation equipment at the terminal l1llI, 1)'+M and 51y. , a data line backup device for Kazuhiro Komochi.