JPS61150543A - In-node point-to-point communicating system - Google Patents

Abstract

PURPOSE:To improve the efficiency for using time slots at the time of point-to- point communication in the same node by executing inter-terminal communication through an internal bus at timing of a time slot which has been instructed to a circuit corresponding part. CONSTITUTION:In case when point-to-point communication is executed between terminals (terminals A, B) which have been connected to the same node, an optional time slot number (TSi) is set to an address register 11 of the circuit corresponding parts A, B. When a frame counter shows TSi, an output 16 of a comparator becomes effective in the circuit corresponding part A, and data is sent out to an output data bus 7 from an output buffer 14. Also, a status for showing a fact of the point-to-point communication in the same node is informed to a common controlling circuit 3, therefore, an input 2 is selected by a selector 4, and the data of the output data bus 7 is sent out to an input data bus 6. Accordingly, the communication of the terminal A B is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a point-to-point (PP) communication system within the same node in a data highway system having a loop configuration.

[Conventional technology]

In recent years, data highway systems that apply optical communication technology have been actively developed. In the data highway method of time division multiplexing, each node (communication control device) is given a fixed timeslot node number (address), and the arrived timeslot node number is compared with the timeslot number given to its own node. A method is used in which, when a match occurs, data in the time slot is received and data is written in the time slot.

[Problem that the invention seeks to solve]

In this way, in general data highways, only time slots (in the case of time slot system) on the transmission path are provided as communication paths between terminals. Therefore, when performing P-P communication between terminals connected to the same node, two time slots (one used for communication between terminals A and B and the other used for communication between terminals B and A) are required.

As a result, when performing P-P communication between terminals of different nodes, only one time slot is required, but the efficiency of time slot node usage becomes poor, and P-P communication within the same node As the number of lines increases (terminals included in the same node are often connected via nodes due to conditions such as connection cables and distance), this poses the problem of putting pressure on the number of lines that can be accommodated by the entire system. Ta.

[Means for resolving issues]

In order to solve the above-mentioned problems, the present invention provides a line corresponding section provided for each terminal to connect the terminals, and a common control section that controls the exchange of data between the transmission path and the line corresponding section. In a data highway system configured such that a plurality of nodes having a plurality of nodes are connected in a ring via the transmission path and communicate using time slots, the line corresponding section has two consecutive time slots specified in advance)TSi, The means for recognizing TSi+1, the operation of outputting the transmission data from the terminal onto the output data path within the node, and the operation of inputting the data on the input data path within the node to the terminal are performed in the above time slots TSi, TSi+.
1, and means for controlling the point-to-point communication between the line corresponding section and other line corresponding sections within the node. further comprising means for returning the data on the output data path to the input data bus when the common control section in the node receives a notification from the notification means in the line corresponding section. When performing point-to-point communication between a pair of terminals connected to the same node, the data sent and received between the pair of terminals is The present invention is characterized in that the communication operation is performed by looping back inside the node.

〔Example〕

FIG. 6 is a diagram showing a general configuration example of a data highway. In the figure, l represents a transmission path, 21 represents a terminal, and 22 to 25 represent nodes.

FIG. 7 is a diagram showing an example of the structure of a frame circulating on the transmission path l. The frame is a puffer fish (F in the diagram)
H) and a plurality of time slots (TSO to TSn).

FIG. 1 is a block diagram of a node in an embodiment according to the present invention. In the figure, 1 is a transmission path, 2 is a receiver, 3 is a common control circuit section, 4 is a selector, 5 is a line corresponding section, 6 is an input data bus, 7 is an output data node, 8 is a control path, and 9 is a select signal ( 10 is a driver.

The difference from the conventional configuration in FIG. 1 is that a selector 4 is provided and the configuration of a line correspondence section 5 (described later).

The selector 4 is configured to select either input 1 or 2 by a select signal 9 from the common control circuit section 3, and when input 2 is selected, the contents of the output data bus 7 are transferred to the input data bus 6. It is set to be sent. The select signal 9 is sent to the selector 4 when the common control circuit unit 3 is notified of the status indicating that P-P communication is being performed from the line corresponding unit 5 to another line corresponding unit 5 in the same node. It has a function of issuing an input 20 selection instruction. Further, when the notification comes from the line handling section 5, the common control circuit section 3 branches the data for the time slot.
Do not perform inserts.

FIG. 2 is a configuration diagram of the line correspondence section 5 in the embodiment. The difference from the conventional configuration in Figure 2 is that the output buffer 1
The output signal 16 of the comparator 13 controls whether or not 4 outputs data to the output data bus 7, and controls whether the input buffer 15 inputs data from the input data bus 6.
．． 17, which can be individually controlled.

The comparator 13 compares the time slot number held in the address register 11 with the content of the frame counter (indicating the time slot number currently passing through the node) output from the common control circuit section 3, The signal 16°17.8-4 is output according to the instruction, and control as shown in FIG. 5, for example, is possible.

In FIG. 5, output 8-4 is an OR signal of outputs 16 and 17, and is a signal indicating a processing request to common control circuit section 3.

Also, while this signal is valid (on), the control register 12
The status (signal 19) indicating the communication mode of the line corresponding unit 5 (whether to execute P-P communication within the same node, etc.) held in the line is sent to the common control circuit unit 3 through the gate 20 and signal line 8-1. You will be notified.

FIG. 3 shows the operation when performing P-P communication between terminals (terminals A and B) connected to the same node in the node configuration described above.

This will be explained below with reference to FIG.

Line corresponding parts 5 to which terminals A and B are connected are referred to as line corresponding parts A and B, respectively.

(2) Set an arbitrary time slot number (TSi) in the address register 11 of the line corresponding parts A and H.

■ The control register 12 of the line support unit A (B) is set so that the output 16 (17) of the comparator 13 is valid when the frame counter indicates TSi, and the output 17 (16) is valid when the frame counter indicates TSi+1. Set control signal 18.

■ When the frame counter indicates T S i, the output 16 (17) of the comparator becomes valid in the line corresponding section A (B), and the data is sent from the output buffer 14 to the output data bus 7 (the input data bus is sent to the input data bus 15). 6 is input). In addition, the output 8-4 of the comparator 13
is also valid and is set in the control register 12 in advance. Since the common control circuit unit 3 is notified of the status indicating P-P communication within the same node, input 2 is selected by the selector 4, and the data on the output data bus 7 is sent to the input data bus 6. ing. Therefore, communication to terminal A-B is executed as shown in FIG.

■ When the frame counter indicates T S i+1, the line corresponding section A (B) outputs the output 17 (16
) becomes valid, and the input buffer 15 becomes the input data bus 6.
(The output buffer 14 sends the data to the output data bus 7). In addition, the output 8 of the comparator 13
-4 is also valid and has been previously sent to the control register. Since the common control circuit unit 3 is notified of the status indicating P-P communication within the same node, the input 2 is selected by the selector 4 and the data on the output data bus 7 is sent to the input data bus 6. There is. Therefore, the fourth
As shown in the figure, communication between terminals B and A has been executed.

In the explanations of (1) to (2) above, () indicates the case of the line corresponding section B.

Further, in FIGS. 3 and 4, 21 is a terminal, a chain line extending from the terminal 21 indicates the flow of data, and other details are the same as in FIG. 1.

〔Effect of the invention〕

As explained above, according to the present invention, the line corresponding parts A and B
(TSi, TS i+1)
Since communication between terminals A and B is executed through the internal bus at the timing of be done.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a node in one embodiment according to the present invention;
The figure is a configuration diagram of the line support section in the embodiment, and Figures 3 and 4.
Figure 5 is a diagram explaining the operation of the embodiment, Figure 5 is a diagram showing the output mode of the control signal, Figure 6 is a diagram showing a general configuration example of the data highway, and Figure 7 is a diagram showing the circuit on the transmission path. FIG. 3 is a diagram showing an example of the structure of a frame in which In FIG. 1, 1 is a transmission line, 3 is a common control circuit section, and 4 is a transmission line.
is a selector, 5 is a line corresponding section, 6 is an input data hash, 7
is an output data path, and 9 is a select signal (line). Warehouse 1st $zEJ #5 Figure 3TfJ Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] A plurality of nodes are connected in a circular manner via the transmission path, each having a line corresponding section provided for each terminal in order to connect the terminals, and a common control section controlling the exchange of data between the transmission line and the line corresponding section. In a data highway system configured to communicate using time slots, the line corresponding section has a means for recognizing two consecutive time slots TSi and TSi+1 specified in advance, and a means for transmitting data transmitted from a terminal to a node. The above time slot T
Means for controlling which timing to carry out between Si and TSi+1, and means for controlling the point-to-point communication between the line corresponding section and other line corresponding sections within the same node. A notification means is provided to notify the control unit, and the common control unit in the node is provided with a notification means for notifying the control unit.
A means is provided for looping back the data on the output data bus to the input data bus when a notification is received by the notification means in the line correspondence section, and the data is transferred point-to-point between a pair of terminals connected to the same node. When performing communication, the communication operation is performed by looping back data transmitted and received between the pair of terminals within the node at the timing of the time slots TSi and TSi+1. Intra-node point-to-point communication method.