JPH06153246A - Subscriber-line interface section for optical subscriber transmitter - Google Patents

Abstract

PURPOSE:To monitor the data processing state of a subscriber-line interface section of an optical subscriber transmitter transmitting an optical burst in a ping-pong way in the unit of bits. CONSTITUTION:A transmission timing of transmission data S1 in a transmission signal generating section 1 is controlled by a control signal S7 from a timing control section 8. The data S1 are converted into an optical signal S2 by an optical transmission section 2. The signal S2 is outputted to an optical subscriber transmission line 110 as an optical signal S3 via optical branch circuits 3,4 and looped back to an optical reception section 6 as an optical signal S4 (S5) via the optical branch circuits 3, 4. The optical signals S9, S4 inputted from the transmission line 110 and the optical branch circuit 4 are converted into reception data S6 by an optical reception section 5 and a reception signal processing section 6 and processed for reception at a reception signal processing section 7. The transmission data S1 and the reception data S6 are monitored by a coincidence detection section 9 in the unit of bits and the fault of the interface section is monitored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber line interface section of an optical subscriber transmission device, and more particularly, it adopts a single star structure to ping-pong an optical burst signal between a subscriber line multiplexer and a subscriber line terminating device. The present invention relates to a subscriber line interface unit of an optical subscriber transmission device for transmission (bidirectional transmission).

[0002]

2. Description of the Related Art A conventional optical subscriber transmission apparatus of this type is a signal interface between the above-mentioned subscriber line multiplexer and subscriber line terminating equipment and the respective terminal devices and optical subscriber line transmission lines. It has a subscriber line interface unit for
In the optical transmitter and the optical receiver included in this interface unit, conventionally, the optical output level is lowered and the optical reception signal is detected to be broken, but the data processed by the optical transmitter and the optical receiver are monitored. Didn't have the function.

FIG. 2 is a block diagram of an optical subscriber transmission device having a single star structure. In this optical subscriber transmission device, a subscriber line multiplexer 21 installed in a station and a subscriber line terminating device 22 installed in a house are formed by a single optical fiber 23 serving as an optical subscriber line transmission line. It is configured. This optical fiber 2
Reference numeral 3 denotes a single core, and the devices 21 and 22 alternately send optical burst signals to the optical fiber 23 to perform so-called ping-pong transmission.

FIG. 3 shows an optical subscriber line transmission line (optical fiber 2
It is a figure which shows the transmission state of said optical burst signal on 3). This figure shows an optical burst signal A from the subscriber line multiplexer 21 to the subscriber line termination device 22 and the subscriber line termination device 2.
The optical burst signal B from 2 to the subscriber line multiplexer 21 is accommodated during one burst period, and the burst signal A
It shows that B and B are transmitted alternately.

[0005]

In the subscriber line multiplexer and subscriber line interface portion of the subscriber line terminating equipment which constitute the above-mentioned conventional optical subscriber transmission apparatus, the above-mentioned optical transmitter and optical receiver are used. However, since it does not have a function of monitoring the processed data in bit units, there is a problem that it takes a lot of time to isolate (identify) the failure point when a failure occurs.

[0006]

A subscriber line interface section of an optical subscriber transmission apparatus according to the present invention comprises a burst-shaped transmission line between an subscriber line multiplexer and a subscriber line terminating device through an optical subscriber line transmission line. A burst signal transmission timing control means for generating a transmission timing signal indicating a transmission timing of the optical transmission signal in the interface in the subscriber line interface portion of the optical subscriber transmission device for ping-pong transmission of the optical transmission signal and the optical reception signal. A transmission signal generating means for generating bursty transmission data at the transmission timing, an optical transmission means for converting the transmission data into the optical transmission signal, and a part of the optical transmission signal to the optical subscriber line transmission line. The optical transmission signal output means to be supplied and the optical subscriber line transmission line depending on the reception timing of the optical reception signal in this interface section. An optical reception signal input means for receiving the optical reception signal, an optical reception means for converting another part of the optical transmission signal and the optical reception signal from the optical reception signal input means into an electric signal, and the transmission signal generation And processing data comparing means for comparing the transmission data from the means and the loopback data converted from another part of the optical transmission signal of the electric signal at the transmission timing.

The subscriber line interface section is
The processed data comparison unit may include a bit comparison unit that compares the transmission data and the loopback data on a bit-by-bit basis, and an alarm transmission unit that outputs an alarm when the compared data do not match.

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. The subscriber line interface unit has substantially the same functions as the subscriber line interface units of the subscriber line multiplexer 21 and the subscriber line terminating device 22 described with reference to FIG. It has a function to monitor data in bit units.

The transmission signal generation unit 1 included in the subscriber line interface unit controls the transmission timing by the control signal S7 from the burst signal transmission timing control unit 8 to transmit the burst transmission data S1 to the optical transmission unit 2 and the transmission data S1. It is sent to the match detection unit 9. This transmission data S1 is transmitted to the optical transmitter 2
Is converted into an optical signal S2 and stored in the coincidence detector 9. The optical signal S2 is branched into two optical signals S3 and S4 by the optical branching circuit 3. This optical signal S4 is used as a loopback signal to the receiving side of this interface section. Further, one of the branched optical signals S3 is further transmitted to the optical subscriber line transmission line 110 using an optical fiber via the optical branching circuit 4 for demultiplexing the optical signal and burst-like optical signal (for example, the optical signal of FIG. 2). It is supplied as a burst signal A).

On the other hand, the optical branch circuit 4 is supplied with a burst-like optical signal (for example, the optical burst signal B in FIG. 2) different from the above from the optical subscriber line transmission line 110. The optical branch circuit 4 supplies this optical signal to the optical branch circuit 5 as an optical signal S9. The optical branching circuit 5 receives the optical signal S9 and the optical branching circuit 3
The optical signal S4 branched by is multiplexed and supplied to the optical receiver 6 as the optical signal S. The optical receiver 6 converts the optical signal S5 into an electric signal S6. Of the electric signal S6, a portion of the optical signal S9 is received and processed by the reception signal processing unit 7, and a portion of the optical signal S4 is input to the coincidence detection unit 9. The coincidence detection unit 9 uses the stored transmission data S1 and electrical signal S6.
A portion of the optical signal S4 is compared bit by bit at the transmission timing by the control signal S7, and if these signals do not match, an alarm signal S8 is output.

Therefore, since the above-mentioned coincidence (mismatch) detection is performed at the timing of transmitting the optical burst signal in the ping-pong transmission, there is no influence on the reception of the optical burst signal.

[0013]

As described above, the present invention utilizes the fact that the optical burst signal is not received from the opposite device at the time of transmitting the optical burst signal in the ping-pong transmission, and the transmission optical burst signal is looped back to the receiving side for transmission. Since the data and the transmission data obtained from the looped back optical burst signal are compared at the transmission timing, there is an effect that the data processing status in the interface unit can be monitored, and thus the device failure can be carried out in bit units.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of an optical subscriber transmission device having a single star configuration.

FIG. 3 is a diagram showing a transmission state of an optical burst signal on an optical subscriber line transmission line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 transmission signal generation part 2 optical transmission part 3-5 optical branch circuit 6 optical reception part 7 received signal processing part 8 burst signal transmission timing control part 9 coincidence detection part 21 subscriber line multiplexer 22 subscriber line termination device 23 optical Fiber 110 Optical subscriber line transmission line

Claims (3)

[Claims] 1. A subscriber of an optical subscriber transmission device for ping-pong transmitting burst-like optical transmission signals and optical reception signals through an optical subscriber line transmission line between a subscriber line multiplexer and a subscriber line terminating device. A line interface unit, a burst signal transmission timing control unit for generating a transmission timing signal indicating a transmission timing of the optical transmission signal in the interface unit, a transmission signal generation unit for generating burst transmission data at the transmission timing, and the transmission Optical transmission means for converting data into the optical transmission signal, optical transmission signal output means for supplying a part of the optical transmission signal to the optical subscriber line transmission line, and reception timing of the optical reception signal in the interface section And an optical reception signal input means for receiving the optical reception signal from the optical subscriber line transmission line, and another one of the optical transmission signals. And an optical receiving means for converting an optical receiving signal from the optical receiving signal input means into an electric signal, and transmission data from the transmission signal generating means and another part of the optical transmission signal of the electric signal. A subscriber line interface unit of an optical subscriber transmission device, comprising: processed data comparison means for comparing the converted loopback data at the transmission timing. 2. The processed data comparing means includes bit comparing means for comparing the transmission data and the loopback data in bit units, and alarm sending means for sending an alarm when the compared data do not match. The subscriber line interface unit of the optical subscriber transmission apparatus according to claim 1, further comprising: 3. A subscriber of an optical subscriber transmission device which performs ping-pong transmission of burst-like optical transmission signals and optical reception signals through an optical subscriber line transmission line between a subscriber line multiplexer and a subscriber line terminating device. A line interface unit, a burst signal transmission timing control unit for generating a transmission timing signal indicating a transmission timing of the optical transmission signal in the interface unit, a transmission signal generation unit for generating burst transmission data at the transmission timing, and the transmission Optical transmission means for converting data into the optical transmission signal, optical branching means for branching the optical transmission signal into two, and one of the branched optical transmission signals is supplied to the optical subscriber line transmission line and the optical signal is transmitted. Optical demultiplexing / multiplexing for receiving the optical reception signal at the reception timing of the optical reception signal in the interface section from the subscriber line transmission line A stage, an optical signal multiplexing means for multiplexing another one of the branched optical transmission signals from the optical branching means and the optical reception signal received by the optical demultiplexing / multiplexing means, and the multiplexed optical signal. Optical receiving means for converting an optical signal into an electric signal, transmission data from the transmission signal generating means, and loopback data converted from another one of the branched optical transmission signals of the electric signal. A subscriber line interface section of an optical subscriber transmission apparatus, comprising: processed data comparison means for comparing at the transmission timing.