JPH09261296A - Burst signal transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly detect the overlapping of burst signals by inserting respective pieces of information of starting/ending to the respective bytes of the starting/ending of the burst signal with fixed length so as to transmit it. SOLUTION: In a transmitting part 10, starting information and ending information having a prescribed pattern as against the transmission burst signal with fixed length L in its leading byte and ending byte are respectively inserted by a starting/ending byte inserting part 11 and transmitted. In a receiving part 20, a starting/ending byte extracting part 21 respectively extracts the starting byte and the ending byte. The position of the starting byte is judged by the arrival of the burst signal, the position of the ending byte is predicted by the starting byte since the length L of the burst signal is fixed and the ending byte is extracted at the predicted position. In a judging part 22, the respective patterns of the starting byte and the ending byte are compared with the respective patterns which are previously stored in a starting/ending byte pattern storage part 23 so as to judge normality/abnormality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burst signal transmission system, and more particularly to a burst signal transmission system for transmitting and receiving a burst signal of a fixed length.

[0002]

2. Description of the Related Art As an example of this type of burst signal transmission system, a PDS (Passive Double St) is used.
ar) transmission method, and its schematic block diagram is shown in FIG. In FIG. 3, the station device 1 and the optical network terminating devices (ONUs) 4-1 to 4-n in a plurality of user home devices are so-called point-to-multipoint connected by an optical star coupler 3. In addition, 2 shows an optical transmission network.

In such a PDS transmission system, as shown in FIG.
As shown in (a), data transmission is performed by transmitting a burst signal of a fixed length L. A byte A indicating the beginning is added to the beginning of each of these burst signals, and the data to be transmitted is superimposed on a plurality of bytes following the beginning.

[0004]

In such a conventional burst signal transmission system, as shown in FIG. 4B, only the byte A indicating the beginning is added to the beginning position of each burst signal. When the burst signals overlap each other, there is a problem that the overlap of the burst signals cannot be detected.

An object of the present invention is to provide a burst signal transmission system capable of correctly detecting the overlap between burst signals.

[0006]

According to the present invention, there is provided a burst signal transmission system for transmitting and receiving a burst signal of a fixed length, wherein head information indicating a head is provided at a head position of the burst signal and its end position is provided. It is possible to obtain a burst signal transmission system characterized by including transmitting means for inserting and transmitting termination information indicating termination.

Further, it is characterized in that it further comprises a receiving means for judging normal reception when both the head information and the end information of the burst signal are detected and for judging other than the above as abnormal reception.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation of the present invention will be described. The head and end information indicating the head and the end are respectively added in advance to each position of the head and the end of the burst signal and transmitted.
On the receiving side, when both the beginning and end information is detected,
It is regarded as normal reception, and when only one of the leading and ending information is detected, it is determined that the burst signals are overlapped.

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

FIG. 1 is a functional block diagram of an embodiment of the present invention, and FIG. 2 is a waveform example of a burst signal for showing the operation of the block of FIG. Referring to both figures, the transmitter 10
In the transmission burst signal having a fixed length L, the start information and the end information B having a predetermined pattern are inserted into the start byte and the end byte by the start / end byte insertion unit 11, respectively. And sends it (see FIG. 2 (a)).

In this case, the patterns A and B of the leading byte and the ending byte are predetermined, and it is natural that a pattern that does not occur in the byte pattern of the data portion is used. Since the data part is scrambled in advance, for example, "0000111"
Since special data patterns such as "1" and "1110000" cannot occur, these special patterns are referred to as A,
B can be adopted.

In the receiving section 20, the head / end byte extracting section 21 extracts the head byte A and the end byte B, respectively. The position of the head byte A can be determined by the arrival of the burst signal, and the position of the end byte B can be predicted from the head byte because the length L of the burst signal is constant. Therefore, the end byte B is extracted at the predicted position.

The judging unit 22 compares the respective patterns of the leading byte and the ending byte thus extracted with the respective patterns A and B stored in advance in the leading / ending byte pattern storage unit 23, thereby making a normal / normal state. Abnormality is judged.

In the normal transmission state shown in FIG. 2 (b), each burst signal has a correct byte pattern of A and B at the beginning and end.
Since each is judged to be B, it is judged to be a normal reception.

In the abnormal transmission state of FIG. 2 (c), it is considered that the preceding burst signal and the succeeding burst signal overlap each other, and it is determined that the reception is abnormal.

[0016]

As described above, according to the present invention, the head / end information is inserted into the head / end bytes of a burst signal of a fixed length for transmission. This has the effect that the overlap of signals can be detected correctly.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a waveform example of a burst signal for explaining the operation of the block of FIG.

FIG. 3 is a system block diagram showing an example of a burst signal transmission system.

FIG. 4 is a diagram showing a waveform example of a burst signal for explaining the operation in the system of FIG.

[Explanation of symbols]

 10 Transmitter 11 Lead / End Byte Insertion Unit 12 Lead / End Byte Pattern Generator 20 Receiver 21 Lead / End Byte Extractor 22 Judgment Unit 23 Lead / End Byte Pattern Storage Unit

Claims (3)

[Claims] 1. A burst signal transmission system for transmitting and receiving a burst signal of a fixed length, wherein head information indicating a head is inserted at a head position of the burst signal, and end information indicating an end is inserted at the end position. A burst signal transmission system comprising a transmitting means for transmitting. 2. The receiving device according to claim 1, further comprising a receiving unit that determines that the reception is normal when both the head information and the end information of the burst signal are detected and determines that the other signals are abnormal. Burst signal transmission system. 3. The burst signal transmission system according to claim 1, wherein the start and end information is a specific pattern that is determined in advance.