JPH11284591A - Supervisory signal transmitting method of sdh transmission system and supervisory signal transmitter-receiver thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supervisory signal transmitting method for an SDH transmission system, in which a supervisory signal including an image in addition to sound is transmitted and received between stations with SDH transmission lines between them. SOLUTION: A supervisory signal transmitter-receiver 3A superimposes a supervisor signal obtained by multiplexing an image signal and a sound signal on a Z1 byte in a SOH of a SDH frame transmitted from an SDH transmitter 2A and a supervisory signal transmitter-receiver 3B reads a Z1 byte in an SOH of an SDH frame received by the an SDH transmitter 2B and reproduces an image and a sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a supervisory signal transmission method and a supervisory signal transmitting / receiving apparatus for an SDH transmission system.

[0002]

2. Description of the Related Art In an SDH (Synchronous Digital Hierarchy) transmission system, a 9-row × 270-column S
Information transmission is performed using the DH frame as one unit. FIG.
As shown in (1), the SDH frame is composed of a payload section carrying a main signal and an overhead section, and the overhead section is composed of an SOH (section overhead) and a POH (path overhead).

[0003] Here, the SOH is an overhead added to the payload for the purpose of, for example, maintaining and managing a transmission line.
Some bytes constituting the SOH have predetermined uses. For example, it is specified that the E1 byte and the E2 byte in FIG. 3 can be used for voice meetings.

Therefore, in the conventional SDH transmission system,
By transmitting the voice for the meeting on the E1 and E2 bytes in the SOH, a meeting telephone function for local maintenance was realized.

[0005]

By the way, in actual localization and maintenance, for example, a failure is found in a certain station, and the situation is explained to maintenance personnel in another station.
In such cases, it may be difficult for the situation to be conveyed only by the explanation in words. In such a case, if the situation such as the failure can be transmitted to the other party as an image, it is considered that the recovery work can be promptly performed. However, a technique meeting such significance has not been provided so far.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances.
It is an object of the present invention to provide a supervisory signal transmission method and a supervisory signal transmission / reception device of an SDH transmission system that enable transmission and reception between stations with a DH transmission path therebetween.

[0007]

The invention according to claim 1 is
An image signal and an audio signal are obtained in the SDH transmission system, multiplexed to generate a monitoring signal, and this monitoring signal is placed on an unused byte in the section overhead of the SDH frame to be transmitted to another SDH transmission system. A method for transmitting a supervisory signal of an SDH transmission system, characterized in that the signal is transmitted to a location.

According to a second aspect of the present invention, an image input means for acquiring an input image in an SDH transmission system and outputting it as an analog image signal, and acquiring an input audio in the SDH transmission system and outputting it as an analog audio signal. Audio input means, image encoding means for encoding the analog image signal output by the image input means to output a digital image signal, and digital audio signal by encoding the analog audio signal output by the audio input means , A multiplexer that multiplexes the digital image signal and the digital audio signal obtained by the image encoding means and the audio encoding means, and outputs a digital monitoring signal, and a signal transmitted from the SDH transmission device. Should S
Monitor signal insertion means for inserting a digital monitor signal output by the multiplexer into unused bytes in the section overhead of the DH frame;
A monitoring signal reading means for reading unused bytes in a section overhead of an SDH frame received from another device by the H transmission device as a digital monitoring signal; and a digital monitoring signal read by the monitoring signal reading device as a digital image signal. A demultiplexer for decomposing the digital audio signal into digital audio signals; an image decoding unit for converting the digital image signal obtained by the demultiplexer into an analog image signal; and a digital audio signal obtained by the demultiplexer to an analog audio signal. Audio decoding means, image output means for outputting an analog image signal obtained by the image decoding means as an image, and audio output means for outputting the analog audio signal obtained by the audio decoding means as sound SDH transmission system characterized by And gist Temu monitor signal transmitting and receiving apparatus.

According to a third aspect of the present invention, the unused byte into which the digital supervisory signal is inserted is the Z1 byte in the section overhead, and the supervisory signal transmitting / receiving apparatus of the SDH transmission system according to claim 2, Is the gist.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of an SDH transmission system to which a supervisory signal transmitting / receiving device according to an embodiment of the present invention is applied. In this example, the terminal device 1A, the SDH transmission device 2A, and the monitoring signal transmitting / receiving device 3A according to the present embodiment are arranged in the station A, and the terminal device 1B, the SDH transmission device 2B, and the present embodiment in the station B. A monitoring signal transmitting / receiving device 3B according to the embodiment is arranged.

In FIG. 1, terminal apparatuses 1A and 1B face each other via a transmission line, and can mutually transmit and receive a main signal. In this case, the main signal transmitted from the terminal station device is transmitted in a state of being carried in the payload portion of the SDH frame. The SDH transmission devices 2A and 2B
This is a means for transmitting the SDH frame. The monitoring signal transmitting and receiving devices 3A and 3B are means provided for the convenience of maintenance and inspection of the offices A and B and the transmission path between them, and transmit monitoring signals obtained by multiplexing image signals and audio signals. The SDH frame has a function of mutually transmitting the unused bytes (specifically, Z1 bytes) in the SOH of the SDH frame.

FIG. 2 is a block diagram showing the configuration of the monitoring signal transmitting / receiving apparatus 3A (3B) according to the present embodiment. As shown in this figure, the monitor signal transmitting / receiving device 3A (3B) includes an image input / output device 31, an image codec 32, an audio input / output device 33, an audio codec 34, a multiplexer / demultiplexer 35, and an SOH process. And a unit 36.

Here, the image input / output device 31 functions as an image input means for outputting an analog image signal corresponding to an input image, and converts an analog image signal (described later) obtained from an image codec 32 as an image decoding means into an image. This is a device having a function as an image output means for outputting the image as an image. The apparatus includes, for example, a camera (image input means) and a television monitor (image output means).

The image codec 32 is an image input / output device 3
1 functions as an image encoding means for encoding the analog image signal output by 1 and outputting a digital image signal, and image decoding for converting a digital image signal (described later) obtained from the multiplexer / demultiplexer 35 into an analog image signal. It has a function as a means.

The audio input / output device 33 functions as an audio input means for outputting an analog audio signal corresponding to the input audio, and outputs an analog audio signal (described later) obtained by an audio codec 34 as an audio decoding means as audio. It has a function as an audio output unit that performs, for example, a microphone (audio input unit) and a speaker (audio output unit).

The audio codec 34 is an audio input / output device 3
3, a function as an audio encoding means for encoding the analog audio signal output by the digital audio signal and outputting a digital audio signal, and an audio for converting a digital audio signal (described later) obtained by the multiplexer / demultiplexer 35 into an analog audio signal. It has a function as a decoding means.

The multiplexer / demultiplexer multiplexes the digital image signal and the digital audio signal obtained by the image codec 32 and the audio codec 34, and functions as a multiplexer for outputting a digital monitoring signal, and is obtained by the SOH processing unit 36. It has a function as a demultiplexer for decomposing a digital monitoring signal (described later) from the monitoring signal transmitting / receiving device 3B (3A) of the other party into a digital image signal and a digital audio signal.

The SOH processor 36 inserts the digital monitoring signal output by the multiplexer / demultiplexer 35 into the Z1 byte in the SOH of the SDH frame to be transmitted from the SDH transmission device 2A (2B). A function as a signal insertion unit, and an SDH received from another device by the SDH transmission device 2A (2B).
It has a function as monitoring signal reading means for reading the Z1 byte in the SOH of the H frame as a digital monitoring signal.

Next, a failure occurs in the station A, and the maintenance person operates the image input / output device 31 and the voice input / output device 3 in the station A.
3, the operation of the present embodiment will be described by taking as an example a case where the situation is explained to other maintenance personnel in the station B.

First, it is assumed that, for example, a maintenance person in the office A takes a picture of a failure location and the like by using the image input / output device 31 and gives a voice explanation using the voice input / output device 33.

In this case, the image of the fault location and the like is converted into an analog image signal by the image input / output device 31, and the analog image signal is converted into a digital image signal by the image codec 32. On the other hand, the voice of the maintenance person is converted into an analog voice signal by the voice input / output device 33, and the analog voice signal is converted into a digital image signal by the voice codec 34.

The digital image signal and digital audio signal thus obtained are multiplexed by the multiplexer / demultiplexer 35 and output to the SOH processing unit 36 as a digital monitoring signal. And SOH
The processing unit 36 inserts this digital monitoring signal into the Z1 byte in the SOH of the SDH frame to be transmitted from the SDH transmission device 2A. As a result, the SDH frame including the digital monitoring signal in the SOH is transmitted to the SDH transmission device 2B in the station B. And the station building B
The following operation is performed by the monitoring signal transmission / reception device 3B inside.

First, the SOH processing unit 36 of the monitoring signal transmitting / receiving device 3B reads the contents of the Z1 byte in the SOH of the SDH frame received by the SDH transmission device 2B, and outputs it as a digital monitoring signal.

The digital monitor signal is decomposed by the multiplexer / demultiplexer 35 into a digital image signal and a digital audio signal.

Then, the digital image signal is converted into an analog image signal by the image codec 32 and sent to the image input / output device 31. As a result, an image of the fault location in the station A is displayed on the television monitor of the image input / output device 31.

On the other hand, the digital audio signal is converted into an analog audio signal by the audio codec 34 and sent by the audio input / output device 33. As a result, the situation explanation of the maintenance staff in the station building A is output as voice.

[0027]

As described above, according to the present invention,
Since it is possible to grasp the situation of the opposite end not only by voice but also by images, maintenance and inspection work of the SDH transmission system becomes easy, and work can be performed efficiently at the time of local tuning or when a problem occurs. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of an SDH transmission system to which a supervisory signal transmitting / receiving apparatus according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram illustrating a configuration of a supervisory signal transmitting / receiving device according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of an SDH frame.

[Explanation of symbols]

 1A, 1B Terminal device 2A, 2B SDH transmission device 3A, 3B Monitoring signal transmission / reception device 31 Image input / output device 32 Image codec 33 Audio input / output device 34 Audio codec 35 Multiplexer / Demultiplexer 36 SOH processing unit

Claims (3)

[Claims] 1. An SDH transmission system acquires an image signal and an audio signal, multiplexes them to generate a supervisory signal, and places the supervisory signal on an unused byte in the section overhead of the SDH frame to transmit the SDH frame. A monitoring signal transmission method for an SDH transmission system, wherein the method transmits the monitoring signal to another part in the system. 2. An image input means for acquiring an input image in an SDH transmission system and outputting it as an analog image signal; an audio input means for acquiring input audio in an SDH transmission system and outputting it as an analog audio signal; Image encoding means for encoding an analog image signal output by the image input means and outputting a digital image signal; audio encoding for encoding the analog audio signal output by the audio input means and outputting a digital audio signal Means, a multiplexer for multiplexing the digital image signal and the digital audio signal obtained by the image encoding means and the audio encoding means and outputting a digital monitoring signal, and a section overhead of an SDH frame to be transmitted from the SDH transmission apparatus The unused bytes in the A supervisory signal insertion means for inserting an output digital monitoring signal, by the SDH transmission device is received from another apparatus S
Monitoring signal reading means for reading unused bytes in the section overhead of the DH frame as a digital monitoring signal; a demultiplexer for decomposing the digital monitoring signal read by the monitoring signal reading means into a digital image signal and a digital audio signal; Image decoding means for converting a digital image signal obtained by the demultiplexer into an analog image signal; audio decoding means for converting a digital audio signal obtained by the demultiplexer into an analog audio signal; Monitoring signal transmission / reception of an SDH transmission system, comprising: image output means for outputting the obtained analog image signal as an image; and audio output means for outputting the analog audio signal obtained by the audio decoding means as audio. apparatus. 3. The supervisory signal transmitting / receiving apparatus according to claim 2, wherein the unused byte into which the digital supervisory signal is inserted is a Z1 byte in a section overhead.