JPS6410146B2 - - Google Patents

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a communication control device, particularly a plurality of line interface circuits with different communication control procedures, and a method for controlling the line interface circuits based on respective communication control procedures. The present invention relates to a communication control device including a line control circuit for common control.

(b) Background of the Technology There are a wide variety of communication control procedures used when transferring required data via a communication line, depending on the type of communication line or the type of terminal device that sends and receives data. Therefore, a switching device accommodating a plurality of communication lines having different communication control procedures of this kind needs to be equipped with a communication control device capable of controlling the accommodated communication lines based on the various communication control procedures.

(c) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional communication control device in this type of switching equipment. In FIG. 1, the communication control device 3 has m communication lines 1 each having a different communication control procedure, that is, procedure 1,
accommodating n communication lines 2 having procedure 2;
Communication control of the communication lines 1 and 2 is carried out based on instructions from the exchange control device 4. The communication control device 3 is
Communication lines 1 and 2 correspond to the communication control procedure.
line interface circuits 5 and 6, respectively, and line interface circuits 5 and 6, respectively.
and a line control circuit 7 that commonly controls the following based on each procedure 1 and procedure 2. Each line interface circuit 5 and 6 is designated by addresses A51 to 5m and A61 to A6n corresponding to each communication line 1 and 2 it accommodates, and temporarily stores data D transferred via each communication line 1 and 2. Data buffers 51 and 61 are provided for each line. Also, in the line control circuit 7,
Corresponding to the data buffers 51 and 61, data buffers 71 and 72 are provided corresponding to each line. Therefore, the line control circuit 7 that attempts to transfer data D to the communication line 1 or 2,
Corresponding address A XY on address bus 8 (XY is 5
Any of 1 to 5m and 61 to 6n,
The same applies hereafter) and send data buffer 71 or 7.
2 corresponding address A XY and data D
carry out the transfer. Furthermore, the line control circuit 7 is provided with a communication control mechanism 74 that controls procedure 1. The line control circuit 7 is the line interface circuit 5
and 6 are fixedly stored in correspondence with the address A
The communication control mechanism 74 is activated by the control unit 76 for addresses A61 to A6n, respectively.

As is clear from the above explanation, in a conventional communication control device, the communication control mechanisms 73 and 74 provided in the communication control device 3 are connected to the address A.
It is activated uniquely corresponding to XY. That is, the accommodation line and communication control procedure are fixed.
Therefore, for example, in order to accommodate m or more communication lines 1 having procedure 1, one additional line interface circuit 5 is provided instead of the line interface circuit 6.
Set up a set of addresses A61 to A on accommodation communication line 1.
Even if 6n is assigned, the addresses A61 to A6n
is specified, the communication control mechanism 74 is activated and communication according to the desired procedure 1 is not carried out, and a new communication control device 3 has to be added, which may impair economic efficiency. Also, when adding a communication control procedure, a line interface circuit must be added for each husband.

(d) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of conventional communication control devices as described above, and to realize a communication control device that can flexibly install required line interface circuits according to demand. .

(e) Structure of the Invention The object is to provide a communication system comprising a plurality of line interface circuits with different communication control procedures and a communication control circuit that commonly controls the line interface circuits based on communication control procedures corresponding to each of the line interface circuits. In the control device, the line interface circuit captured from the communication control circuit transmits a procedure identification code corresponding to its own communication control procedure to the line control circuit, and the line control circuit identifies the received procedure identification code. This is achieved by controlling the line interface circuit based on the communication control procedure shown below.

(f) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a communication control device according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, line interface circuits 5 and 6 in communication control device 3 are provided with procedure identification code circuits 52 and 62 designated by addresses A50 and A60, respectively. When the procedure identification code circuit 52 receives the address A50 from the address bus 8, it generates a procedure identification code C1 indicating procedure 1 and sends it to the data bus 9, and the procedure identification code circuit 62 receives the address A60 from the address bus 8. is transmitted,
A procedure identification code C2 indicating procedure 2 is generated and sent to the data bus 9. On the other hand, the line control communication circuit 7 has an address A50 or A6 on the address bus 8.
a procedure identification code buffer 75 that receives the procedure identification code C1 or C2 transmitted from the data bus 9 when a 0 is sent;
A selection circuit 77 is provided which selects the line control mechanisms 73 and 74 according to the procedure identification code C1 or C2 received by the terminal 5. Communication line 1 and data D accommodated in line interface circuit 5 this time
When transferring the address A50, the communication control circuit 7 sends the address A50 to the address bus 8. The procedure identification code circuit 52 of the line interface circuit 5 that has received the address A50 sends the procedure identification code C1 to the data bus 9. The line control circuit 7 receives the procedure identification code C1 transmitted from the data bus 9 into the procedure identification code buffer 75, and then transmits it to the selection circuit 77. The selection circuit 77 determines from the received procedure identification code C1 that the line interface circuit 5 targeted for communication control corresponds to procedure 1, and starts the communication control mechanism 73. Thereafter, the line control circuit 7 sends the addresses A51 to A5m corresponding to the target communication line 1 to the address bus 8, as described above, and transfers the required data D between the data buffers 51 and 71. Next, when transferring data D to the communication line 2 accommodated in the line interface circuit 6, the line control circuit 7
Address A60 is sent to. The address A60
The procedure identification code circuit 62 of the line interface circuit 6 that received the procedure identification code C transmits the procedure identification code C to the data bus 9.
Send 2. The line control circuit 7 receives the procedure identification code C2 transmitted from the data bus 9 into the procedure identification code buffer 75, and then transmits it to the selection circuit 77. The selection circuit 77 determines from the received procedure identification code C2 that the line interface circuit 6 to be subjected to communication control is in charge of procedure 2, and starts the communication control mechanism 7. Thereafter, the line control circuit 7 sends the addresses A61 to A6n corresponding to the target communication line 2 to the address bus 8 as described above, and transfers the required data D between the data buffers 61 and 72.
transfer. Therefore, for example, when accommodating m or more communication lines 1 having procedure 1, one set of line interface circuits 5' is provided in place of the line interface circuit 6, and the address A60 is set in the procedure identification circuit 52'. is assigned, and the procedure identification code is set to send C1. Further, addresses A61 to A6m are assigned to the communication lines 1 accommodated here. The line control circuit 7 has addresses A61 to A
When the address A60 is sent to the address bus 8 in order to transfer the data D to the communication line 1 corresponding to 6m, the procedure identification code circuit 52' outputs the procedure identification code C.
1 is returned to the data bus 9, the selection circuit 77
starts the communication control mechanism 73, and communication based on procedure 1 is performed.

As is clear from the above description, according to this embodiment, a line interface circuit 5' is provided in place of the line interface circuit 6, and it is possible to accommodate the communication line 1 in step 1 at addresses A61 to A6m. Become.

It should be noted that FIG. 2 is merely an embodiment of the present invention, and for example, the communication control device 3 sends a line interface circuit 5 in charge of step 1 and a line interface circuit 6 in charge of step 2 to one set each. There is no limitation to what is provided, and the effects of the present invention do not change even when a plurality of arbitrary sets are provided. Further, the communication control procedures for the communication lines accommodated in the communication control device 3 are not limited to two types, and the effects of the present invention do not change even when there are three or more types. Further, the configuration of the communication control device 3 is not limited to that shown in the drawings, and many other modifications may be considered, such as configuring the selection circuit 77 together with the communication control mechanism by a program-controlled microprocessor.
In either case, the effects of the present invention remain the same.

(g) Effects of the Invention As described above, according to the present invention, it is possible to realize a communication control device in which a line interface circuit in charge of necessary communication control procedures can be installed flexibly according to demand, and it is also possible to increase the number of communication lines. It can be dealt with economically.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a conventional communication control device, and FIG. 2 is a diagram showing a communication control device according to an embodiment of the present invention. In the figure, 1 and 2 are communication lines, 3 is a communication control device, 3 and 4 are exchange control devices, 5 and 6 are line interface circuits, 7 is a line control circuit, and 8
is an address bus, 9 is a data bus, 51, 61,
71 and 72 are data buffers, 52 and 6
2 is a procedure identification code circuit, 73 and 74 are communication control mechanisms, 75 is a procedure identification code buffer, 76 is a control unit, 77 is a selection circuit, A XY is an address, and C
1 and C2 represent procedure identification codes, and D represents data.

Claims (1)

[Scope of Claims] 1. A communication control device that performs communication by controlling each of a plurality of line groups with different communication control procedures based on communication control procedures corresponding to each group, wherein transfer is performed for each line group. It has line-compatible data buffers 51 and 61 that temporarily store data, and procedure identification code circuits 52 and 62 that generate codes corresponding to their own communication control procedures. Line interface circuits 5 and 6 that accommodate the line group and interface with the lines; data buffers 71 and 72 for data transfer corresponding to the data buffers 51 and 61; a procedure identification buffer 75 that receives a procedure identification code and transfers it to a selection circuit 77; a selection circuit 77 that activates necessary communication control mechanisms 73 and 74 from the received procedure identification code;
a communication control mechanism 7 that performs communication control according to a necessary communication control procedure selected by the selection circuit 77;
3, 74, and a control section 76 that controls the operation of the communication control mechanisms 73, 74.
A communication control device comprising: an address bus 8 and a data bus 9 that connect the line interface circuits 5, 6 and the line control circuit 7.