JPS61150544A - In-node point-to-point communication system - Google Patents

Abstract

PURPOSE:To improve the use efficiency of a time slot by executing data transmission to the other terminal from one terminal by loading data on an assigned time slot, and executing data transmission to one terminal from the other terminal by using an in-node data bus means, in case when point-to-point communication between each of a pair of terminals of plural terminals which have been connected to the same node. CONSTITUTION:In continuous time slots TSi, TSi+1, TSi and TSi+1 are assigned to a circuit corresponding part A and a circuit corresponding part B, respectively. When TSi comes to a buffer 9, the circuit corresponding part A raises a processing request status, a control part 13 allows a selector 14 to select an input 1 by a signal 1, and data (a transmitting data from the terminal B) of TSi in the buffer 9 is read into the circuit corresponding part A. When TSi+1 comes to the buffer 9, transmitting data from the circuit corresponding part A is read into the circuit corresponding part B, and also a signal 18 is controlled so that the contents of an input 2 are inputted to a P/S converter 11 by the next shift clock.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a point-to-point (P-P) communication method 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 time division multiplexing data highway system, each node (communication control device) is given a fixed time slot number (address), and the arrived time slot number is compared with the time slot number given to the own node. , a method is used in which data is received in the time slot and data is written into 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 were required (one used for communication between terminals A and B, and the other used for communication between terminals B and A). .

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 usage becomes poor, and the line for P-P communication within the same node When the number 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. .

[Means for solving problems]

In order to solve the above points, the present invention provides a data highway system in which a plurality of nodes are connected in a ring via a transmission line and communicate data using time slots. An intra-node data path means is provided for selecting either transmission data from a certain terminal or data on a time slot input from the transmission path and transmitting the selected data as received data to another terminal connected to the own node, When point-to-point communication is performed between a certain pair of terminals among the plurality of terminals connected to the same node, data of the pair of terminals is carried and carried out via the transmission path, The present invention is characterized in that data transmission from the other terminal to one of the pair of terminals is performed using the intra-node data path means.

〔Example〕

FIG. 3 is a diagram showing a general configuration example of a data highway. In the figure, 1 to 4 represent nodes, 5 represents a transmission path, and 6 represents a terminal.

FIG. 4 is a diagram showing an example of the structure of frames circulating on the transmission path 5 of FIG. 3. The frame has a frame header (
In the figure, FH) and multiple time slots (TSo-TSn
).

FIG. 1 is a block diagram of a node according to an embodiment of the present invention. In the figure, 5 is a transmission path, 7 is a receiver, 8 is an S/P converter, 9.10 is a buffer, 11 is a P/S converter, 12 is a driver, 13 is a control unit, 14 is a selector, and 15 is a register , 16 to 19 are control signals (lines), 20 is an internal path,
21 is an output data path, 22 is an input data path, 23 is a control path, and 24 is a line correspondence section.

The difference from the conventional configuration in FIG. 1 is that the output of the register 15 is input to the input 2 of the selector 14. As a result, the contents held in the register 15 are sent to the input data path 22 through the selector 14 (that is, the output data path 21
- An internal return path of register 15→selector 19→input data path 22 is created.

The other configurations are the same as before and are as follows. Frames flowing through the transmission path 5 pass through the receiver 7 to the S/
Enters P converter 8.

The frame is converted into parallel data every l time slot in the S/P converter 8, and is moved from the buffer 9 to the buffer 10 to the P/S converter 11 by a shift clock (not shown in the figure) synchronized with the time slot. After being converted into serial data again by the P/S converter 11, it is sent to the transmission line 5 through the driver 12.

Time slots are individually assigned to the 24 line handling units, and when the assigned time slot comes to the buffer 9, the line handling unit 24 sends a processing (data transmission/reception) request and the communication mode of the line handling unit. (P in the same node
-P communication, etc.) is notified to the control unit 13 via the control bus 23. In the control section 13,
Upon receiving the notification, it controls the control signals 16 to 19 as determined by the status, and determines which of the buffers 9 and 10 or the P/S converter 11 the transmission data from the line handling section 24 should be output to; (2) It is determined which of the buffer 9 and the register 15 is selected for the received data to the line correspondence section 24.

The control unit 13 also has a frame counter that indicates which part of the frame is currently in the node, and the time slot number in the buffer 9 is output to the line correspondence unit 24 through the control bus 23. It has become.

In the node having the above configuration, the operation when P-P communication is performed between the terminals (terminals A and B) connected to the node will be described below with reference to FIG.

The line corresponding parts to which terminals A and B are connected are called line corresponding parts A and B, respectively.

■ Continuous time slots TSi,
Of TSi+1, TSi is allocated, and TSi+1 is allocated to line corresponding section B.

■ When TSi comes to buffer 9, line handling section A issues a processing request and raises the status. Then, the control unit 13 outputs the signal 1
9 causes the selector 14 to select input 1, and causes the TSi data (transmission data from terminal B) in the buffer 9 to be read into the line corresponding section A. At the same time, the line corresponding section A sets the transmission data into the register 15.

(Figure 2 (a)) ■ When T S i+1 comes to buffer 9, line corresponding part B
notifies the control unit 13 of the processing request and status. Then, the control section 13 controls the signal 19 to cause the selector 14 to select input 2, causes the line correspondence section B to read the transmission data from the line correspondence section A set in the register 15, and performs P/S conversion. The signal 18 is controlled so that the converter 11 takes in the contents of the input 2 at the next shift clock (timing when TSi shifts from the buffer 10 to the P/S converter 11). At the same time, the line corresponding section B sets the transmission data into the register 15. (In Fig. 2)) ■ When TSi+z comes to the buffer 9, the contents of the register 15 are taken into the P/S converter 11 under the control of the signal 18 as described in ■, and it is converted into the data of TSi. It is sent out to the transmission path as a.

(Fig. 2 (C)) [Effects of the Invention] As explained above, according to the present invention, data to terminal A-B is transmitted through an internal path without using time slots on the transmission path, and data to terminal B-B is transmitted through an internal path without using time slots on the transmission path. Since only the data to A uses a time slot, the time slot that was conventionally used for transmission from A to B can now be used by other nodes, making it easier to perform P-P communication within the same node. Time slot usage efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a node in one embodiment according to the present invention, and FIG.
FIG. 3 is a diagram for explaining the operation of the embodiment, FIG. 3 is a diagram showing an example of a general configuration of a data highway, and FIG. 4 is a diagram showing an example of the configuration of frames circulating on a transmission path. In FIG. 1, 5 is a transmission line, 8 is an S/P converter, 9.
10 is a buffer, 11 is a P/S converter, 13 is a control unit,
14 is a selector, 15 is a register, 16 to 19 are control signals (lines), and 24 is a line corresponding section. vPj Figure 2 countries (a) Kaya 2 Figure and b) Rhinoceros? fJ(C)

Claims (1)

[Claims] In a data highway system in which multiple nodes are connected in a ring via a transmission path and data is communicated using time slots, the node receives data sent from a terminal connected to itself and input from the transmission path. An intra-node data path means is provided to select one of the received data on the time slot and send it as received data to another terminal connected to the same node. When performing point-to-point communication between a pair of terminals, data transmission from one of the pair of terminals to the other requires data to be transmitted in the time slot assigned to one terminal. The node is characterized in that it is configured such that data is transmitted from the other terminal to one of the pair of terminals using the intra-node data path means. Inner point two
Point communication method.