JPH0779326B2 - Multiplex transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in a multiplex transmission system.

(Prior Art) A transmission system adopting a conventional multiplex transmission system is
Shown in the figure. The demultiplexing unit 1 and the demultiplexing unit 2 are connected by a high-speed line 3, and the demultiplexing unit 1 is connected via a bus 4 to low-speed line adapters 5 ₁ , 5 ₂ , 5, ₃ . , The low-speed line adapters 7 ₁ , 7 ₂ , 7, ₃ ...
Are connected. Slow adapter 5 _1, 5 _2, 5 _3, Slow 8 ₁ ... in, 8 _2, 8 _3, ... are connected Slow adapter _71,
The low speed lines 9 ₁ , 9 ₂ , 9 ₃ , ... Are connected to 7 ₂ , 7 ₃ ,.

In such transmission systems, high speed data transmission using the line 3, FIG. 9 each Slow 8 ₁ a required bit n-bit data field Sebamare by synchronization code F as shown in (A), 8 _2, It was assigned to 8 ₃ , ... For simplicity, if each 4 bits of each low speed line 8 ₁ , 8 ₂ , 8 ₃ , ... Are arranged in one frame of the high speed line 3, the demultiplexing unit 1 will use the low speed line adapters 5 ₁ , 5 ₂ FIG. 9 shows 4-bit data D ₁₁ ,, D ₁₂ ,, D ₁₃ ,, D ₁₄ ,, D ₂₁ ,, D ₂₂ ,, D ₂₃ , D ₂₄ , D ₃₁ ,, D ₃₂ , ... received through, 5 ₃ ,. As shown in (A), they are continuously arranged in one frame X, multiplexed, and transmitted. Then, in the demultiplexing unit 2 which has received the multiplexed data via the high speed line 3, as shown in FIG. 9B, each bit D ₁₁ , D ₁₂ , D ₁₃ , D ₁₄ (D
₂₁ , D ₂₂ , D ₂₃ , D ₂₄ , D ₃₁ , D ₃₂ ,) ... are separated based on each clock, and low-speed line adapters 7 ₁ , 7, ₂ 7, 7 ₃ ... Send to. The low speed line adapter 7 ₁ is 4-bit data D ₁₁ , D according to the line speed of the low speed line 9 _1.
12 , D ₁₃ , D ₁₄ , D ₁₁ , D ₁₂ , D ₁₃ , D ₁₄ , ... to the low speed line 9 ₁
It is sent out as shown in FIG. Other low speed line adapter 7 ₂ , 7 ₃ ,
... also performs the same operation as the low-speed line adapter 7 _1.

In such a conventional multiplex transmission system, all the n-bit data of the low-speed line are continuously arranged in one frame of the high-speed line. It was supposed to be given to the line adapter. For this reason, the low-speed line adapter requires an n-bit data buffer, which increases the system configuration.
It has the drawback of being complicated and costly.

(Problems to be Solved by the Invention) As described above, according to the conventional multiplex transmission method, since n-bit data is simultaneously provided to the low-speed line adapter, an n-bit data buffer is required, and the system However, there is a drawback in that the configuration of (1) becomes large and complicated, and the cost becomes high. The present invention has been made in view of the above-mentioned drawbacks of the conventional multiplex transmission system, and an object thereof is to reduce the number of data buffers of a low-speed line adapter and to reduce the size and simplification of the system configuration. The purpose of the present invention is to provide a multiplex transmission system that can reduce the cost.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, data is received from a plurality of low-speed lines, multiplexed, transmitted through a high-speed line, and then multiplexed data is separated to obtain a plurality of low-speed lines. The data of a predetermined bit received from the low speed line for transmitting the data before the multiplexing in the multiplex transmission system to be distributed to the line is arranged and transmitted in one frame in the high speed line. is there.

(Operation) According to the above, since the bit data dispersed in one frame in the high-speed line can be sequentially given to the one low-speed line at a predetermined time interval, one conventional low-speed line can be provided. The data buffer in the low-speed line adapter can be reduced as compared with the case where all the data of the assigned predetermined bits are given at the same time.

(Example) Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a transmission system adopting the method of one embodiment of the present invention. In the figure, reference numerals 101 and 102 denote demultiplexing units. The demultiplexing unit 101 and the demultiplexing unit 102 are high-speed lines.
Data is transmitted via 103. 104 ₁ , 104 ₂ , 104 ₃ , ... are low-speed lines, and the data sent from the low-speed lines 104 ₁ , 104 ₂ , 104 ₃ ... are taken in to the low-speed line adapters 105 ₁ , 105 ₂ , 105 ₃ , ... It is sent to the demultiplexing unit 10 ₁ via the rare bus 106.
The demultiplexing unit 101 multiplexes the data received via the bus 106 and sends it to the high-speed line 103. This multiplexing is performed based on the bit arrangement information a given from the control unit 107. That is, the low speed line adapter 105 ₁ , 105 ₂ ,
105 ₃ , ... is the line speed of the low speed line 104 ₁ , 104 ₂ , 104 ₃ , ... and 1
Information about the number of bits forming the frame is detected, and this information is sent to the control unit 107 via the bus 108. Control unit
107 is a low speed line 104 ₁ , based on the above given information.
Bit arrangement information a for arranging data of predetermined bits 104 ₂ , 104 ₃ , ... In a single frame in the high-speed line 103 in a discrete manner is created. For example, when the low speed lines 104 ₁ , 104 ₂ , 104 ₃ ... Have the same line speed, each frame consists of n bits, and the number of lines is m, as shown in FIG. 2 and FIG. In one frame Y on line 103,
1 bit of 1 frame of each low speed line is allocated respectively, and m
One block is made up of bits, and n blocks of this block are transmitted to form one frame Y.
To produce. D _ij indicates the j-th data on the low speed line 104 _i . In this way, the demultiplexing unit 102 that has taken in the data that has been multiplexed and transmitted as shown in FIG. 3 separates the multiplexed data and sends it to the bus 109. The transmission timing at this time may be determined in advance, or may be controlled by the information given from the control unit 110. The data of the bus 109 is taken in by the low speed line adapters 111 ₁ , 111 ₂ , 111 ₃ , ... At a predetermined timing and sent to the low speed lines 112 ₁ , 112 ₂ , 112 ₃ ,. The bus 113 and the control unit 110 have the same functions as the bus 108 and the control unit 107 when the demultiplexing unit 102 sends data.

In a transmission system configured in this way, low-speed lines
When arranging the 4-bit data received from 104 ₁ in one frame Y in the high-speed line 103, as shown in FIG. 4, data D ₁₁ , D ₁₂ , D ₁₃ and D ₁₄ are set every m bits. The bit arrangement information a is transmitted to the demultiplexing unit 101 so that the control unit 1
Given by 07. Therefore, the demultiplexing unit 101 multiplexes the data and sends it to the high-speed line 103 as shown in FIG. The demultiplexing unit 102 receives the demultiplexed data and demultiplexes it, and sends the data D ₁₁ , D ₁₂ , D ₁₃ , D ₁₄ , D ₁₁ , ... To the bus 9 at the timing shown in FIG. 5 (B). Low speed line adapter
111 ₁ is data D ₁₁ , D ₁₂ , D ₁₃ , at the timing of FIG.
D ₁₄ , D ₁₁ , ... are taken in and the low speed line is set at the timing shown in FIG. 5 (C) (timing corresponding to the line speed of the low speed line 112 ₁ ).
Send to 112 ₁ . Therefore, the low speed line adapter 111 ₁
Since it is not necessary to hold 2 bits of data taken in from the bus 109 at the same time, the same applies to the low-speed line adapters 111 ₂ , 111 ₃ , etc., which require only 1 bit for the data buffer. Can be less. In particular, if the predetermined bit is discretely arranged in one frame of the high speed line in consideration of the line speed of the low speed line, the data buffer can be minimized.

In the present embodiment, when there are m low-speed line adapters, 1-bit data is arranged for every m bits, but when the line speed of the low-speed line is slow, as shown in FIG.
It may be every 2m bits (generally every lm bit, l; natural number). Conversely, if the line speed of the low speed line is fast, conversely m /
It may be l bits. Further, the data need not be arranged at equal intervals, and the data of each bit may be multiplexed at different intervals as shown in FIG. Further, the number of bits of data to be placed in one frame of a high speed line and received from one low speed line may not be 4 bits as in the present embodiment.

As described above, according to the present invention, the data to be sent to one low-speed line is arranged discretely within one frame of the high-speed line, so the data buffer of the low-speed line adapter is reduced. Therefore, the system configuration can be downsized and simplified, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmission system according to an embodiment of the present invention, FIGS. 2 and 4 are diagrams showing a method of arranging data for multiplexing, FIG. 3, FIG. 5, and FIG. , FIG. 7 is a diagram showing multiplexed data, FIG. 8 is a block diagram of a transmission system adopting a conventional multiplex transmission system, and FIG. 9 is a diagram showing data multiplexed by the conventional multiplex transmission system. FIG. 101,102 ... demultiplexer 103 ... high-speed line 104 ₁ , 104 ₂ , 104 ₃ , ..., 112 ₁ , 112 ₂ , 112 ₃ , ... low-speed line 107,110 ... control unit

Claims (2)

[Claims] 1. A multiplexing transmission system for receiving data from a plurality of low-speed lines, multiplexing the data, transmitting the data via a high-speed line, separating the multiplexed data and distributing the separated data to the plurality of low-speed lines. A multiplex transmission system, wherein predetermined bits of data received from the low-speed line for transmitting data are arranged and transmitted in one frame in the high-speed line in a discrete manner. 2. A discrete interval is determined based on a line speed of a low speed line.
The multiplex transmission method described in the item.