JPH02119347A - Loop type data transmission system - Google Patents

Abstract

PURPOSE:To acquire channels by data slave stations in the neighborhood of a loop master station with the same timing by inserting to attach a frame number for channel with the same number as the frame number on frame data, and branching frame data on which a corresponding frame number for channel is attached from reception data. CONSTITUTION:The branch and insertion means of a data master station 3 inserts to attach the frame number for channel with the same number as the frame number on insertion frame data, and branches the frame data on which the corresponding frame number for channel is attached from the reception data. the branch and insertion means of data slave stations 2a-2c insert the frame data after attaching the corresponding frame numbers for channel, and branch the frame data on which the numbers are attached from the reception data. By performing such operation, it is possible to acquire the channels by the data slave stations 2a and 2c in the neighborhood of the loop master station 1 with the same frame timing, and to perform communication of 1 to N by using a prescribed frame number. In such a way, the data slave stations in the neighborhood of the loop master station can acquire the channels with the same frame timing, and the communication of 1 of N can freely be performed by using the prescribed frame number, and also, a band area can be divided efficiently corresponding to terminal data speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a loop-type data transmission system for data communication. Especially multi-frame! The present invention relates to 1-to-1 and 1-to-N communication systems in which data is transmitted using only specific frames when loop transmission delay correction is performed on a frame-by-frame basis rather than on a multi-frame basis on a data transmission path formed by +'\.

[+Summary]

The present invention is a loop-type data transmission method: In this case, in the case of a multi-frame t+s''r configuration, in addition to the frame number of each frame, a channel frame number with the same number as the frame number is added to the frame data and inserted. By branching the frame data based on the channel frame number added to the frame data, the data slave stations before and after the loop master station can acquire a channel at the same frame timing. It is designed to enable communication with N.

[Conventional technology]

Conventionally, loop data transmission lines have a single frame 1 configuration. The loop master station performs frame synchronization of the received data, manually inputs the received data to the loop transmission delay correction circuit, stores it once, and outputs the data at independent frame timing. The data master station performs frame synchronization with the received data, constantly adds and drops data, and outputs the transmitted and received data of the masked terminals it accommodates. The data slave station performs frame synchronization with the received data, branches the data, uses it as received data for the slave terminal to be accommodated, and inserts the transmitted data based on a transmission request from the slave terminal.

[Problem that the invention seeks to solve]

However, in such conventional loop-type data transmission systems, the frame structure is changed from a single frame structure to a multi-frame structure, and in order to prevent an increase in transmission delay time, the loop transmission delay correction of the loop master station is performed on a frame-by-frame basis. If the data is transmitted using some frames in the multi-frame, the loop transmission delay correction circuit will output the data at the next frame timing when the data passes through the loop master station, and the data will be transmitted in a different frame. Since communication is impossible due to transfer, there is a drawback that data transmission can only be performed using all frames consecutively.

The present invention solves the above-mentioned drawbacks, and allows data slave stations located before and after a loop master station to acquire a channel at the same frame timing and perform 1-to-N communication using a predetermined frame number. The purpose is to provide a loop-type data transmission method.

[Means for solving problems]

In the loop data transmission system of the present invention, the dropping/inserting means of the data master station adds and inserts a channel frame number equal to the frame number to the frame data, and inserts the corresponding channel frame from the received data. Particularly, the method includes a means for branching frame data to which a number is added, and the means for branching and inserting the data slave station includes a means for inserting and branching frame data to which a frame number for the corresponding channel is added. .

[Effect]

The branching/inserting means of the data master station adds and inserts a channel frame number equal to the frame number to the inserted frame data, and branches the frame data to which the corresponding channel frame number is added from the received data. The branching/inserting means of the data slave station inserts frame data with a corresponding channel frame number added thereto, and branches the frame data to which this number is added from the received data.

By the above operation, the data slave stations located before and after the loop master station can acquire a channel at the same frame timing, and can perform one-to-N communication using a predetermined frame number.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of a loop type data transmission device according to an embodiment of the present invention. FIG. 3 is a block diagram of the loop master station of the loop data transmission apparatus of the present invention. FIG. 4 is a block diagram of the data master station of the loop type data transmission apparatus of the present invention.

FIG. 5 is a block configuration diagram of a data slave station of the loop type data transmission apparatus of the present invention. 1, 3, 4, and 5, the loop data transmission device includes one loop master station 1, one data master station 3, and a plurality of data slave stations 2a, 2b. , 2C, a loop-type data transmission path connecting each of the above stations in a loop, a mask terminal 4 connected to the data master station 3, and slave terminals 5c % 5a s 5b connected to the data slave stations 28 to 2C. The loop master station 1 includes a frame synchronization circuit 5a, a loop transmission delay correction circuit 7, a mask crotter generation circuit 8, and a multiframe generation circuit as loop transmission delay correction means for temporarily accumulating received data and transmitting it at the next multiframe timing. The data master station 3 and the data slave station 2 each include frame synchronization circuits 6b, 6C and data drop/drop/add circuits 11a, 11 as means for relaying frame data in synchronization with the multi-frame timing.
lb, means 12a and 12b for branching and inserting corresponding frame data in the multiframe, terminal data separation circuits 13a and 13b, and terminal data multiplexing circuit 15.
a, including 15b.

Here, the feature of the present invention is that the dropping/inserting means of the data master station 3 adds and inserts a channel frame number equal to the frame number to the frame data,
A channel frame synchronization circuit 12a and a channel frame generation circuit 14 are included as a means for branching frame data to which a corresponding channel frame number is added from received data, and means for branching and inserting data slave stations 2a, 2b, and 2C includes: A channel frame synchronization circuit 12b and a channel frame number transmitting circuit 16 are included as means for inserting and dropping frame data to which a corresponding channel frame number is added.

The operation of the loop data transmission device having such a configuration will be explained.

FIG. 2 is a time chart of signals in each part of the loop-type transmission line of the present invention. 1 and 2, the data master station 3 has frame number 1 (Fl) in the multi-frame.
) is inserted into the loop data transmission path as frame data A (#l) with the same channel frame number #1 added as frame number 1 (Fl). , the data slave station 2b relays the received data and branches to the slave terminal 5a accommodating frame data A(#l) in synchronization with the channel frame number #1. Similarly to the data slave station 2b, the data slave station 2C also relays received data and branches to the slave terminal 5b that accommodates frame data A (#1).

In addition, loop master station 1 stores the received data once and transmits it at the next frame timing, so frame data A (#
1) is sent as frame number 2 (F2) data. Furthermore, the data slave station 2a relays the received data in the same way as the data slave station 2b, and transmits frame number 2 (F2) in synchronization with the frame with the channel frame number #1.
Frame data A (#1) is branched from the frame of channel frame number #1, and the transmission data is synchronized with the frame of channel frame number #1 based on a transmission request from the slave terminal 5C to be accommodated. The frame data B (#1) is inserted into the loop data transmission path, and the data master station 3 branches to the mask terminal 4 that accommodates the frame data B (#1) in synchronization with the channel frame number #1.

In FIG. 3, the loop master station 1 determines the synchronization of received data with a frame synchronization circuit 6a, inputs the received data frame by frame to a loop transmission delay correction circuit 7, and operates using the output clock signal of a mask crotter generation circuit 8. Received data is output from the loop transmission delay correction circuit 7 at the frame timing of the multi-frame generation circuit 9, and the frame number output from the multi-frame generation circuit 9 is superimposed on the received data by the multiplex circuit 10, and the data is transmitted.

In FIG. 4, the data master station 3 uses a channel frame synchronization circuit 12a to determine the synchronization of the received data branched by the data drop/add circuit 11a, and the timing of the corresponding frame data to be output from the terminal data separation circuit 13a to the master terminal 4. control. The terminal data multiplexing circuit 15a receives the channel frame number output from the mask terminal 4 from the channel frame generation circuit 14, which operates at the control timing of the frame synchronization circuit 6b, which determines the frame synchronization of the received data on the loop data transmission path. Added to the transmitted data,
Frame data is inserted from the data branch/insertion circuit 11a at the timing of the frame synchronization circuit 6b.

In FIG. 5, the data slave station 2a uses a channel frame synchronization circuit 12b to determine the synchronization of the received data branched by the data drop/add circuit 11b, and determines the timing of the corresponding frame data to be output from the terminal data separation circuit 13b to the slave terminal 5C. Control. The terminal data multiplexing circuit 15b transmits, from the slave terminal 5C, the channel frame number output from the channel frame number transmission circuit 16 which operates at the control timing of the channel frame synchronization circuit 12b based on the transmission request from the slave terminal 5C. The frame data is added to the data, and frame data is inserted from the data branch/insertion circuit 11b at the timing of the frame synchronization circuit 6C.

〔Effect of the invention〕

As explained above, the present invention enables data slave stations located before and after a loop master station to acquire a channel at the same frame timing and freely perform 1-to-N communication using a predetermined frame number. , which has the excellent effect of efficiently dividing the band according to the terminal data rate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a loop type data transmission device according to an embodiment of the present invention. FIG. 2 is a signal time chart of each part of the loop type data transmission device of the present invention. FIG. 3 is a block diagram of the loop master station of the loop data transmission device of the present invention. FIG. 4 is a block diagram of the data master station of the loop type data transmission device of the present invention. FIG. 5 is a block configuration diagram of a data slave station of the loop type data transmission device of the present invention. 1... Loop master station, 2a to 2C... Data slave station, 3
...Data master station, 4...Mask terminal, 5a to 5C.
...Slave terminal, 6a to 6C...Frame synchronization circuit, 7...Loop transmission delay correction circuit, 8...Mask crotter generation circuit, 9...Multi-frame generation circuit, 1
0...Multiple circuit, lla, llb...Data add/drop circuit, 12a112b...Channel frame synchronization circuit, 13a, 13b...Terminal data separation circuit,
14...Channel frame generation circuit, 15a,
15b...Terminal data multiplexing circuit, 16...Channel frame number transmission circuit.

Claims (1)

[Scope of Claims] 1, comprising one loop master station, one data master station, a plurality of data slave stations, and a loop-shaped data transmission line connecting each of the stations in a loop, The master station includes loop transmission delay correction means for temporarily accumulating received data and transmitting it at the next multi-frame timing, and the data master station and data slave station each relay frame data in synchronization with the multi-frame timing. In a loop data transmission system including a means for adding and dropping corresponding frame data in a multi-frame, the means for adding and dropping corresponding frame data in a multi-frame is configured such that the means for adding and dropping the corresponding frame data in the data master station inserts a frame number for a channel having the same number as the frame number into the frame data. The means for branching and inserting the frame data to which the frame number for the corresponding channel is added from the received data, and the means for branching and inserting the frame data of the data slave station is A loop data transmission system characterized by including means for inserting and dropping frame data.