JPS626552A - Remote loop control system - Google Patents

Abstract

PURPOSE:To attain returning at each control section by remote control from one end by using F bits of control bits of envelope information as a remote loop and providing a remote loop command section and a pattern generating circuit to each line adaptor. CONSTITUTION:In case of the remote loop mode, an instruction of the returning instruction section 5 is given to a pattern generating section 6, from which a pattern according to the instruction is generated and sent while being super-imposed on the F bits on an envelope sequentially to inform the transmission of the remote loop command to the opposite party. An envelope reception section 7 sends the F bits, used for the remote loop control in the control bit to a remote loop detection section C9 in the order of reception. The remote loop detection section C9 checks always whether or not the F bits sent sequentially is coincident with the pattern C and when they are coincident, the loopback circuit A2 is controlled to return the data to the DTE and the highway. Thus, the remote loop C is constituted in this way to execute a loopback test.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data network configured in a loop, and particularly to a remote return control system for a loop data network.

(Prior art) Conventionally, this type of system was a single loop, so loopback control for fault isolation was performed end-to-end (EN
It would have been better to do it in D-To-END).

(Problem to be Solved by the Invention) However, in a large-scale system consisting of multiple loops consisting of a main loop and sub-loops, when a line failure occurs, the above-mentioned END-TO-END control is not economical (disadvantageous). Poor efficiency.

In such a case, it is necessary to perform a divided search for the failure location so that turnaround can be performed at each demarcation point.

It is an object of the present invention to provide a remote loop control method that allows loopback at each control section by remote control from one end, and allows detailed identification of failures to be determined.

(Means for Solving the Problems) The remote loop control method according to the present invention has a main loop and a plurality of sub-loops, and in a loop-shaped data highway that transmits octet multiplexed data, data allocated to each line is Of the control bits of the envelope information on the highway, one bit is used for remote control, and a circuit for sending a remote loop instruction and a circuit for detecting it and returning the line are installed in each line corresponding section and in the main loop and subloop. This is provided in the speed converter, and by patterning the remote loop control bits, data is looped back at a designated location.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a line handling section 10 according to an embodiment of the present invention. Here, 1 is a level converter, 2 is a folding circuit (A), 3 is a data receiving section, 4 is an envelope assembly section, 5 is a folding instruction section, 6 is a pattern generating section, 7 is an envelope receiving section, and 8 is a data transmitting section , 9f'i remote loop detection section (C). Further, 20 is a sub-highway control section (A). First, data sent from the terminal via the level converter 1 is buffered in the data receiving section 3, and when 6 bits are received, it is sent to the envelope assembly section 4, where 2 bits of F and S control bits are added. The data is sent to the sub-highway control 20, put on a predetermined channel, octet multiplexed, and sent to the sub-loop data highway. Here, among the control bits, the F (frame) bit is used for remote loose control, and the S bit is used for the control line of the terminal.

If a line trouble occurs due to some kind of failure, a local loop and remote loose command can be issued by operating the return command unit 5.

In the case of the local loop mode, the return instruction section 5 directly controls the return circuit (A) 2 to return the transmitted data to the DTE side and the highway side. In the case of remote loop mode, the instructions from the loopback instruction section 5.

The pattern is transmitted to the pattern generation unit 6, a pattern according to the instruction is generated, and the pattern is sequentially placed on the F bit on the envelope and sent out, notifying the other party that the remote loop instruction has been sent. For example, to make a remote loop, pattern C4
- If sent, the call is returned to the other line support unit, and the return operation in the single line support unit 10 is as follows.

The octet multiplexed data sent from the data highway of the subloop is received by the subhighway control 20 in time slots allocated to each line corresponding section, and sent to the envelope receiving section 7. The envelope receiving section 7 sends the 6 bits of data to the data transmitting section 8, matches the terminal speed, and sends them to the terminal via the level converter 1. Among the control bits, the F bit used for remote loop control is sent to the remote loop detection unit (C) 9 in the order in which it is received. The remote loop detection unit (C) 9 constantly checks whether the F bits that are sequentially sent match the pattern C'C. If a match is found, it is determined that the other party has issued a loopback instruction, and the loopback circuit (A) 2 is controlled to input an instruction to loop back the data to the DTE side and the highway side. As a result, a remote loop (C) is configured, and a return test can be executed. This state is maintained until a normal pattern (all 0) t- is detected.

FIG. 2 is a block diagram of a sub-main loop speed converter (...iway speed converter) 40 according to an embodiment of the present invention. In this sub-main loop speed converter 40,
It carries out the operation of loading channel-corresponding data that is octet-multiplexed and sent from the sub-loop data way to the faster main route, and the reverse operation of taking it out. The data control unit (A) 411d of the sub-main loop speed conversion unit 40 performs the operation of transferring the data sent from the Furoopno Iway to the faster main loop highway, but it does not transfer it to any channel. It has the ability to be loaded.

The data control unit (B) 43 takes in data sent from the main highway by specifying an arbitrary channel, and sends it to the subloop highway. The remote loop detection unit (A) 42 detects (number of channels) x (pattern A) + (1 bit) of the subloop highway, and the remote loop detection unit (B) 44 detects (number of channels) x (number of channels) of the subloop highway. It has a memory capacity equivalent to (Putter 7B) + (1 pit), and captures the F bit of the envelope information received in accordance with the channel by data control (A) 41 or data control (B) 43, and stores it in the memory corresponding to the channel. The remote loop detection unit (A) 42 stores the contents of the memory and reads out the contents of the memory, and the remote loop detection unit (B) 4 determines whether the pattern matches pattern A.
Step 4 constantly checks whether the pattern matches pattern B or not, depending on the channel. If the patterns match, set the remote loop detection billatra "'1#" in the memory corresponding to the channel.As a result, when the memory is read corresponding to the channel, if the bit is "P1",
During the channel control time, the loopback circuit (B) 45
The data taken in by the data control (B) 43 is looped back to the main loop via the data control (A) 41 through the feedback circuit (B) 4s, and the data taken in by the data control (A) 42 is is looped back to the subloop via the loopback circuit 45 and the data control (B) 43 . As a result, remote loop A or remote loop B is configured. This state of deafness is maintained until normal pattern (all 0) f: is received.

FIG. 3 is an mK diagram of a loop-shaped data highway having an octet multiplexed main loop and a plurality of sub-loops with fixed connections accommodating terminals. The data sent from the terminal is sent to the sub-highway control 2 in the form of an envelope with F and S Villatra added via the line support section 1.
0 to a specific channel, octet multiplexed, and sent to the subloop highway 60, subhighway control (B) 30, highway speed i conversion g4
0 and the main highway control section 50, the vehicle is driven onto the octet multi-longitudinal main loop highway at higher speed. Exporting from the main loop to the subloop is performed in the reverse order, data is sent to the other terminal, and data is transferred between the terminals.

FIG. 4 shows a flowchart of return points and return data when a remote loop is performed. The following five types of patterns are possible by operating the callback instruction unit 5 of the line handling unit 10. Regarding (1) to (5) shown in the figure, in (1), when not operated, a normal pattern of F pattern 7 q all O is sent out, and data is transferred between the terminals. (2) is a local loop, and the F pattern is a normal pattern of all O's as in (1) above, but is looped back within itself. (3) is for remote loop A, and pattern F is pattern (A
) is sent.

A turnaround is performed just before the subloop is transferred to the main loop. (41f'i, in remote loop B, pattern (B) is sent out, and loopback is performed on the main loop side before being transferred from the main to the subloop. (5) is in remote loop C, As for the pattern, pattern (C) is sent out, and loopback is performed at the exit of the partner line corresponding section 10 of the subloop.

(Effects of the Invention) As explained above, the present invention uses F (frame) of control bits of envelope information as a remote loop,
By providing a remote loop instruction section and a pattern generation circuit for creating an F Piratra pattern in each line corresponding section, and providing the detection section and folding circuit in the line corresponding section and highway speed conversion section, remote control from one end can be realized. The 1til+ leg enables loopback at each control section, allows for detailed investigation to isolate failures, can be effectively used during periodic inspections, and can be done economically and efficiently. effect is brought about.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of a line correspondence section according to an embodiment of the present invention, and FIG. 2 is a block diagram of a subloop/main loop speed U'ltZ conversion section according to an embodiment of the present invention. FIG. 3 is a block diagram illustrating the configuration of a data highway with a main loop and sub-loop configuration, and FIG. 4 is a diagram showing turnaround points and the flow of return data when a remote loop instruction according to the present invention is executed. DESCRIPTION OF SYMBOLS 1... Level converter, 2... Folding circuit (A), 3... Data receiving section, 4... Envelope assembly section, 5... Folding instruction section, 6... Pattern generation section, 7 ... Envelope receiving section, 8... Data transmitting section. 9... Remote loop detection unit (C), 10... Line support unit, 20... Sub-highway control unit (A), 30
...Subhighway control g(n). 40...Highway speed conversion section, 50...Main highway control section, 60°.
・Sub loop data is 1 way, 70... Main loop data is 1 way.

Claims (1)

[Claims] In a remote loop control method for a loop-shaped data highway that has a main loop and multiple sub-loops and transmits octets multiplexed, one bit of the control bits of envelope information on the data highway allocated to each line is Used for remote control, a circuit for sending a remote loop instruction and a circuit for detecting it and looping back the line are installed in each line corresponding section and the speed conversion section of the main loop/subloop, and the remote loop control bits are set in a pattern. A remote loop control method that is characterized by looping back data at specified points by