JPS58212238A - Automatic switching system of multiplex converter system - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution, by giving a high speed signal from a common use multiplex converter to a spare multiplex converter system via a branching means so as to detect a transmission failure of the common-use system and to test the operation of the spare system with a signal monitoring means provided in the spare device system. CONSTITUTION:The common-use system multiplex converter is constituted with multiplex converters 1, 3 of a low and a high speed, and the spare multiplex converter is constituted with multiplex converters 2, 4 of a low and a high speed. The output side of this converter is provided with a signal regenerating section 19 comprising a dipolar/unipolar converting circuit and a unipolar/bipolar converting circuit having a high input impedance, which gives a high speed transmission signal from the converter 3 to the converter 4 and the operation from the converter 1 is monitored at signal monitoring circuit 12, 14 in the converters 2, 4 in the spare system respectively at all times. Further, the signal line side of the converter 2 is provided with a folding circuit comprising of relay contacts rl 10, 11, for testing the operation of the spare system to simplify the circuit constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic switching system for a multiplex converter system in which a working multiplex converter system and a standby multiplex converter system are configured in an l-to-l correspondence.

The automatic switching method of the conventional PCM multiplex converter system is as follows:
A system is adopted in which all output signals of the individual multiplex converters constituting the system are monitored by signal monitoring circuits provided in one-to-one correspondence with each output signal, and desired switching is performed.

FIG. 1 is a block diagram showing an automatic switching system of a conventional multiplex converter system.

Low-speed PCM multiplex converter (e.g. transmission rate 8Mb/S)
)2 and a high-speed PCM multiplex converter (e.g. 34Mbit/
In the standby multiplex converter system consisting of S) 4, test No. 1g generated by the test signal generating circuit 5 is given to the low speed multiplex converter (hereinafter referred to as low speed MUX) 2, and furthermore, this signal is High-speed multiplex converter (hereinafter referred to as high-speed MUX)
) 4 and low speed M via relay contacts r, t32
The signal is looped back to UX2 and applied to test signal monitoring circuit wt6 via relay contact r-118t-, and the operation of the backup multiplex converter system is constantly checked. here.

When a fault is detected by the test signal monitoring circuit 6,
Switching operations between active and standby use are prohibited.

Signal monitoring circuits 11, 13, 15 and 17 of the current multiplex converter system consisting of low speed MUX 1 and high speed MUX 3
when a fault is detected.

Relay contacts r-131 to r-8 operate, and a backup multiplex converter system consisting of a low-speed MUX 2 and a high-speed MUX 4 is used for information signal transmission in place of the active system.

The test signal generation circuit 5 and the test signal monitoring team w! 6 is connected. In this state, a signal from one circuit 5 is sent back to circuit 6 via relay contact rJl, thereby making it possible to check the operation of the current multiplex converter system in which a fault has occurred.

However, in such a conventional automatic switching system, in addition to the signal monitors wr11 to wr14 for monitoring received signals, there are also signal monitors wr11 to wr14 for monitoring transmitted signals. In addition, since a test signal generation circuit wI5 and a test signal monitoring circuit 6 are required for constantly checking the operation of the standby multiplex converter system, the circuit scale increases and a reliable formula is not provided.

The switching system of the present invention has a working multiplex converter system and a standby multiplex converter system, each of which converts a low-speed signal to a high-speed signal and vice versa, and switches both systems to a single line. In an automatic switching system of a multiplex converter system that performs connection, a high-speed reconnaissance signal from the active multiplex converter system is applied to the backup multiplex converter system through a branching means, and The detected signal monitoring means detects a transmission failure in the active multiplex converter system and tests the circuit operation of the backup multiplex converter system.

Next, the present invention will be explained in detail with reference to all the drawings.

FIG. 2 is a configuration diagram showing one embodiment of the present invention.
This figure shows a state in which a current multiplex converter system consisting of UXI, high speed, and MUX3 is used for information signal transmission.

In this example, a bi-boad 2 with high input impedance is used.
・The high-speed transmission MM signal from the high-speed MUX 3 is given to the high-speed signal receiving side of the backup high-speed MUX 4 through the signal reproducing unit 19 consisting of a unipolar conversion circuit and a unipolar-bipolar conversion circuit, and the current multiplex conversion equipment fund is The operation of the constituent low-speed MUX1 and high-speed MUX3 is controlled by the signal monitor wr in the standby low-speed MUX2 and high-speed MUX4, respectively.
12 and 14 are constantly monitored. Furthermore, on the low-speed signal side of the standby low-speed MUX2, relay contact r, 61
0 and the r-type 11 constitute a folding circuit.

In FIG. 2, when a failure is detected in one of the signal monitoring circuits 11 to 14, first.

9. Relay contact r-e1 switches from side a to side b. Connected to the backup sending side. At this time, in the backup multiple conversion system, relay contacts r-e1. Regeneration unit 19, relay contact r-e3. High speed MUX 4, low speed MUX 2.
Since a loop circuit consisting of relay contacts r, ell and relay contact r110 is configured, the signal monitor TNr1
2 and 14), all circuit operations of the standby multiplicity 5-converter system can be checked.

When a failure in the backup system is detected in the operation check of the backup system, switching operation from the active system to the backup system is prohibited.

In addition, in the operation check of the standby system, if no failure was detected in the standby system, Ic was immediately issued.

The V-contacts r131 to r and e11 operate, and the information transmission system is switched from the active system to the standby system. At this time, in the faulty working multiplex converter system, relay contacts r and el1
gI reproduction section 19. Relay contact r! 3゜High speed MUX
3. Low speed MUX l, relay contacts 149 and 1
A loop circuit consisting of one contact point rt8 is constructed, and continuous monitoring of the current multiple converter system is performed.

When switching to the side, the transmission side circuit operation of the protection system is constantly monitored by the signal monitoring circuits 11 and 13 of the active system, and the active multiplex converter system can be used as the protection system.

Figure 3 is a configuration diagram showing the configuration of the note playback W19. Ruru.

In the figure, since the signal reproducing unit 19 has all the high impedance resistors 25 on the input side, it hardly affects the bipolar signal sent from the high speed MUX 3 to the transmission line. The signal attenuated through all the resistors 25 is converted into a unipolar signal by the bipolar-unipolar conversion circuit wr20, and then sent to the amplifier circuit 21. Reproduction circuit 22 and tuning circuit 2
3, after regeneration, unipolar/bipolar conversion circuit 2
4, the bipolar signal is regenerated into the same signal as the bipolar signal sent to the transmission path.

As described above, the present invention has the advantage that the signal monitoring circuit for monitoring the transmitted signal, the test signal generation circuit, and the test signal monitoring circuit that were conventionally required are not required, and that the circuit configuration is simplified and reliability is improved. There is.

4. Brief description of the drawings: Fig. 1 is a block diagram showing a conventional automatic switching system, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram showing a signal reproducing section. It is.

In the figure, 1 to 4...multiple converter, 1 old...
・Test signal generation circuit, 6... River Test Signal Monitoring Team%.

11-18... Signal monitoring circuit, 19. Old... Signal reproducing section, 20... Bipolar/unipolar conversion circuit.

21... Amplification circuit, 22... Regeneration N path, 23... Group tuning circuit, 24... Unipolar/bipolar conversion times %, 25... resistor, te
l-11...Relay contact.

Claims (1)

[Claims] An automatic multiplex converter system that has a working multiplex converter system and a standby multiplex converter system, each of which converts a low-speed signal to a high-speed signal and vice versa, and switches and connects both systems to communication lines. In the switching system, all high-speed signals from the working multiplex converter system are branched to the backup multiplex converter system, and a signal monitoring means provided in the backup multiplex converter system outputs the high-speed signals from the working multiplex converter system. An automatic switching system for a multiplex converter system characterized by detecting a transmission failure in the device system and performing a circuit operation test for a backup multiplex converter system.