JPH0583014B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention transmits the line capacity initially on a pair of transmission lines in a wired transmission line such as an optical fiber cable, and later increases the line capacity to double or quadruple the line capacity. This paper relates to an economical multiplex conversion method that can be applied when increasing the amount of data.

[Conventional technology]

In order to further increase the maximum capacity of a conventional multiplex converter, it is necessary to add a similar multiplex converter and a higher-order multiplex converter, or remove the existing multiplex converter and install a multiplexer with a larger capacity. The method used was to replace it with a conversion device.

[Problem that the invention seeks to solve]

The above-described conventional expansion method has the drawback that the changes are extensive and the equipment cost and installation cost are high. Furthermore, the method of connecting to a higher-order multiplex converter also requires an increase in installation space and power consumption. Furthermore, the method of replacing the converter with a multiplex converter having a larger capacity is expensive because the existing device cannot be used.

[Means for solving problems]

The multiplex conversion method according to the present invention consists of arranging a plurality of unit blocks of the same configuration in parallel and having input/output terminals for intermediate signals between the low-order group and the high-order group, placing the high-order group side circuit in a specific block, and using an intermediate signal between the blocks. By connecting at the signal level, the capacity can be expanded to twice or four times that of the unit block. Each block has a substantially common low-order group side circuit and internal connections, and is configured such that only the high-order group side circuit section can be changed by multiplexing.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a block diagram shows the structure of a unit block (basic block) used in one embodiment of the present invention. In the figure, 11 indicates a low-order group side circuit, and 12 indicates a high-order group side circuit. 13 is an internal connection for intermediate signals between the low-order group side circuit 11 and the high-order group side circuit 12, half of which is connected to the terminal 14.
This allows you to change the connection at will. Further, a terminal 15 is provided so that an intermediate signal between the low-order group and the high-order group can be inputted and outputted to the high-order group side circuit 12 from the outside.

FIG. 2 shows a configuration in which only one basic block shown in FIG. 1 is used. In the figure, 21 is a low-order group input/output signal, and 24 is a high-order group input/output signal.
Half of the intermediate signals are interconnected by signal lines 25. Therefore, the low-order group side circuit 22 has a one-to-one correspondence with the high-order group side circuit 23. If the low-order group side circuit 22 includes a multiple conversion circuit,
The higher-order group side circuit 23 does not perform multiplexing/demultiplexing operations, but performs only interface processing with the higher-order group input/output signal 24.

FIG. 3 is a block diagram showing an example in which two basic blocks shown in FIG. 1 are used to realize twice the multiplicity of the basic blocks. The low-order group side circuit 32 is the second
This is the same as the low-order group side circuit 22 in the figure. On the other hand, on the higher order group side, the multiple processing unit 33 and the separation processing unit 35
It is being replaced by . Further, the two basic blocks are interconnected by a signal line 36.

FIG. 4 is a block diagram showing an example in which four basic blocks shown in FIG. 1 are used to realize a multiplicity four times that of the basic blocks. The low-order group side circuit 42 is the second
This circuit is the same as the low-order group side circuits 22 and 32 shown in FIGS. The higher-order group side is replaced with a multiple processing section 43, a separation processing section 45, and a pass-through connection circuit 46. Also, the four basic blocks have signal lines 47 and 48.
are interconnected by

FIG. 5 is a block diagram showing a configuration in which the basic block shown in FIG. 1 is cascaded to an external multiplex converter. The low-order group side circuit 52 is the same as the low-order group side circuits 22, 32, and 42 of FIGS. 2, 3, and 4. All high-order groups are replaced with pass-through connection circuits 53, and intermediate signals are multiplexed and converted externally. This configuration is used when a multiplicity of 5 times or more than the basic block is required.

〔Effect of the invention〕

As explained above, the multiplex conversion method according to the present invention has the advantage of minimizing initial investment and being able to economically cope with future increases in capacity. In particular, in transmission lines using optical fiber cables, the spacing between repeaters can be kept almost constant even when the multiplicity (transmission speed) of transmission signals increases, so it is easy to increase the multiplicity as in the present invention. The advantages of a multiplex converter that can be used are significant.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a basic block used in one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration when only one basic block shown in FIG. 1 is used, and FIG. A block diagram showing an example in which two basic blocks in Fig. 1 are used to achieve twice the multiplicity of the basic blocks. A block diagram showing an example of achieving severe symptoms, Figure 5 is the first
FIG. 2 is a block diagram showing a configuration when the basic blocks shown in the figure are cascade-connected to an external multiplex converter. 11, 22, 32, 42, 52...low-order group side circuit (low-order group input/output or multiplexing/separating circuit), 12, 23
...High-order group side circuit (high-order group input/output or multiplexing/separation circuit), 13...Intermediate level signal line, 14, 15...Intermediate level signal connection terminal, 21, 31, 41, 51
...low-order group input/output signals, 24, 34, 44, 55...
High-order group input/output signal, 25, 36, 47, 48, 5
7, 58... External connection line, 33, 43, 54... Multiplex and higher order group output circuit, 35, 45, 56... Higher order group input and separation circuit, 46, 53... Pass-through connection circuit.

Claims (1)

[Claims] 1. A low-order group side circuit 11 that transmits and receives low-order group input/output signals 21, 31, 41, and 51, an interface processing section 23, multiple processing sections 33, 43, separation processing sections 35, 45, and a pass-through connection circuit 46 , 53, and transmits and receives high-order group input/output signals 24, 34, and 44.
, an intermediate level signal line 13 that internally connects the low-order group side circuit and the high-order group side circuit, and an intermediate level signal line 13 that is connected to the low-order group side circuit and can change the connection of the intermediate signal between the high-order group side circuit and the high-order group side circuit. connected to the first intermediate level signal connection terminal 14 and the higher-order group side circuit,
A second intermediate level signal connection terminal 14 that can change the connection of intermediate signals with the low-order group side circuit, and an intermediate signal between the low-order group and the high-order group can be input/output from the outside to the high-order group side circuit. A basic block having the same configuration and two third intermediate level signal connection terminals 15 can be used alone, or two or four units can be arranged in parallel to change the connection path of the intermediate signal and the higher-order group side circuit. This multiplex conversion method is characterized in that by replacing only 12 blocks, the number of multiplexes can be doubled or quadrupled compared to the case of a single basic block.