JPH0530073A - Digital multiple separator - Google Patents

Abstract

PURPOSE:To output an alarm display signal even at the time of the fault of the power source of the device and to specify a fault generation part without delay. CONSTITUTION:A power source disconnection detection part 42, to which the power is supplied from a second power supply part 45 different from a first power supply part 40 of a multiple separation part 31, detects the disconnection of the power supply of the multiple separation part 31. Alarm transmission parts 43 and 44, to which the power is supplied from the second power source part 45, generates an alarm display signal at the time of detecting power source disconnection of the power source disconnection detection part 42, sending it to a low order device 11 and a host device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital demultiplexer, and more particularly to a digital demultiplexer for multiplexing and demultiplexing digital transmission signals.

The present invention relates to a device for multiplexing / demultiplexing digital signals. In recent years, as the importance of telecommunications has increased, there has been a demand for shortening the specified time of a failure point as one method for prompt failure recovery when a failure occurs in a communication device.

[0003]

2. Description of the Related Art Conventionally, when a failure such as an input digital signal disconnection or power failure of a digital demultiplexing apparatus, when the failure spreads to a digital demultiplexing apparatus located above and / or below the failed apparatus, In order for the upper and / or lower digital demultiplexer to recognize that it is not a failure due to a failure of its own device but a secondary failure due to a failure of another digital demultiplexer, the digital demultiplexer as a failure source The digital signal sent from the digital demultiplexer to the upper and / or lower order from the alarm display signal (AIS signal: Al) of all "1" patterns.
armIndication Signal).

FIG. 2 shows a block diagram of an example of a conventional device. In the figure, reference numeral 10 denotes an 8M / 34M digital demultiplexer, which is an HD having a transmission rate of 34 Mbps supplied from a higher-order 34M / 140M digital demultiplexer 11.
The B-3 (High Density Bipolar of Order 3) signal is supplied to the signal break detection unit 15 in the demultiplexer 10.

When the HDB-3 signal does not come in, the signal disconnection detecting section 15 detects the signal disconnection and causes the AIS generating section 16 to generate the AIS signals of all "1" patterns. Further, the incoming HDB-3 signal is supplied to the digital signal separation unit 17 through the signal disconnection detection unit 15 and the AIS generation unit 16, where the signal of 8 Mbps is separated from the signal of the transmission rate of 34 Mbps, and the separated HDB-3 of 8 Mbps is supplied. -3 signal is transmitted to the lower 2M / 8M digital demultiplexer 12.

Further, the CMI signal coming from the digital demultiplexing device 11 is also supplied to the AIS detection section 18 and the AI
When the S detector 18 detects all the AIS signals of "1" pattern, it instructs the alarm generator 19 to generate an alarm. Power is supplied from a power supply unit 20 to each unit of the digital demultiplexer 10.

[0007]

In the conventional apparatus, when a failure occurs in the power supply section 20, the AIS generating section 16 also becomes inoperable, and the upper and lower digital demultiplexing apparatuses 12 only recognize the signal interruption and fail. There is a problem that it is not possible to specify whether the occurrence location is the digital demultiplexing apparatus or the transmission path between the devices 10 and 12, and the identification of the failure occurrence location is delayed.

The present invention has been made in view of the above points,
An object of the present invention is to provide a digital demultiplexing device that can output an alarm display signal even when a power source of a device is faulty and can specify a fault occurrence point without delay.

[0009]

A digital demultiplexing device of the present invention multiplexes or demultiplexes digital signals supplied from a lower device and an upper device and supplies them to an upper device and a lower device, as well as a fault in its own device. In a digital demultiplexing device that generates an alarm display signal when it occurs and sends it to a higher-level device and / or a lower-level device, a second demultiplexing unit different from the first power supply unit of the demultiplexing unit that multiplexes or demultiplexes the digital signal. Power is supplied from the power supply section of the power supply unit, and a power failure detection unit that detects power failure of the demultiplexing unit, and power is supplied from the second power supply, and an alarm display signal is generated when the power failure detection unit detects power failure. And an alarm sending unit for sending to an upper device and a lower device.

[0010]

According to the present invention, the power-off detecting unit and the alarm sending unit, which are supplied with the second power source different from the demultiplexing unit, generate an alarm display signal when the demultiplexing unit has a power failure and generate the upper and lower levels. In order to supply the digital demultiplexer of the present invention, the upper and lower digital demultiplexers can identify the fault occurrence point by distinguishing it from the fault of the transmission line when the power source of the digital demultiplexer of the present invention fails.

[0011]

1 is a block diagram of an embodiment of the device of the present invention. 2, those parts which are the same as those corresponding parts in FIG. 2 are designated by the same reference numerals, and a description thereof will be omitted.

In FIG. 1, reference numeral 30 denotes an 8M / 34M digital demultiplexer, which is composed of a demultiplexer 31 and a power failure detector 32, and which is supplied from the 2M / 8M digital demultiplexer 12. The HDB-3 signal having the rate of 8 Mbps is supplied to the signal disconnection detector 35 in the demultiplexer 31.
Is supplied to.

The signal disconnection detector 35 detects the signal disconnection when the HDB-3 signal does not come in and causes the AIS generator 36 to generate all the "1" pattern AIS signals. The HDB-3 signal coming from the digital demultiplexer 12 is supplied to the digital signal multiplexer 17 through the signal disconnection detector 35 and the AIS generator 36, where the signal of frequency 8 MHz is multiplexed and the transmission rate is 34 Mbps. Signaled,
The HDB-3 signal of 34 Mbps is transmitted to the digital demultiplexing device 11.

The HDB-3 signal coming from the digital demultiplexer 12 is also supplied to the AIS detector 38,
When the AIS detecting section 38 detects all the "1" pattern AIS signals, it instructs the alarm generating section 19 to generate an alarm.

The power supply unit 40 supplies power to each unit of the demultiplexing unit 31, and the relay 41 is off when the power supply unit 40 supplies power, but it turns on when the power supply is cut off. This relay is connected to the power failure detection section 42 of the power failure detection section 32, and the power failure alarm detection section 42 generates a power failure detection signal when the relay 41 is turned on and supplies it to the AIS transmission sections 43 and 44, respectively. .

When the AIS transmissions 43 and 44 are respectively supplied with the power failure detection signal, the transmission rates are 8 Mbps and 34 Mbps.
A digital demultiplexer 1 for generating each AIS signal
It is sent to each of 1 and 12. The power supply unit 45 supplies power to each unit of the power supply failure detection unit 32.

As described above, the power failure detection section 32, which is a separate power source from the demultiplexing section 31, generates an AIS signal when a power failure occurs in the demultiplexing section 31 and supplies the AIS signal to the downstream digital demultiplexing apparatuses 11 and 12, respectively. Therefore, in each of the digital demultiplexing devices 11 and 12, when the power source of the digital demultiplexing device 30 fails, it is possible to identify the location of the failure by distinguishing it from the failure of the transmission path.

[0018]

As described above, according to the digital demultiplexer of the present invention, an alarm display signal can be output even when the power source of the device is faulty, and the location of the fault can be specified without delay, which is extremely useful in practice.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a device of the present invention.

FIG. 2 is a block diagram of an example of a conventional device.

[Explanation of symbols]

 11, 12, 30 Digital demultiplexing device 15, 35 Signal disconnection detection unit 16, 36 AIS generation unit 17 Digital separation unit 31 Demultiplexing unit 32 Power failure detection unit 40 First power supply unit 41 Relay 42 Power failure detection unit 43, 44 AIS sending unit 45 Second power supply unit

Claims (1)

What is claimed is: 1. A lower device (11) and an upper device (12).
The supplied digital signal is multiplexed or separated and supplied to the upper position (12) and the lower position (11), and an alarm display signal is generated when a failure occurs in the own device to generate the upper position (12) and (or). ) In the digital demultiplexing device for sending to the lower position (11), a second power supply unit (45) different from the first power supply unit (40) of the demultiplexing unit (31) for multiplexing or demultiplexing the digital signal. ), And a power-off detection section (42) for detecting power-off of the demultiplexing section (31), and a power-off detection section (4) supplied with power from the second power source.
2) A digital demultiplexing device comprising: an alarm sending unit (43, 44) for generating an alarm display signal when a power failure is detected and sending it to a lower device (11) and an upper device (12).