JPS6242639A - Data highway communication system - Google Patents

Abstract

PURPOSE:To reset quickly a section which is restored from trouble by gathering and judging state information of annular data transmission lines, which are recorded in communication equipments where loop back is set, by a communication equipment having the monitor function. CONSTITUTION:A communication equipment 1 having monitor functions and plural communication equipments 21-2n are connected by duplexed annular data transmission lines 3 and 4, and the equipment 1 judges a trouble to set loop-back as shown by 10 and 11 in the figure if frame synchronization in the system of the transmission line 3 or 4 cannot be acquired. When the trouble of the equipment 24 is restored thereafter, the equipment 24 discriminates whether frame synchronization is detected or not and sets loop back as shown by 24. The equipment 25 stores detection of frame synchronization in a storage part as state information of transmission lines. The equipment 1 receives infor mation transferred from the equipment 25 to judge restoration from the trouble and instructs release of the loop-back 11.

Description

[Detailed Description of the Invention] [Summary] A data highway in which a plurality of communication devices are connected by a duplicated circular data transmission path, and signals are transmitted and received using frames circulating on the circular data transmission path. In a system, if one-sided operation or loopback operation is performed on the transmission line due to a failure or stoppage of one of the communication devices or a failure in the data transmission line, even if the failure is recovered, the loopback After expanding the section,
In order to return to normal operation, there was a problem in that the operator had to intervene and take measures each time. A means to record all of the status information is provided, and a communication device with a monitoring function collects and analyzes the recorded data.
, discloses a control system that automatically performs control for extending the loopback section by instructing the communication device to extract the data.

[Industrial application field]

The present invention relates to the control of a data highway communication system, and in particular, when a part of a circular data transmission path or a 1G device has a failure and is operated by loopback, when the failure is recovered. This relates to the control to ensure that the transition to normal operation or expansion of the loopback section is fully automatic.

[Conventional technology]

FIG. 3 is a diagram showing an example of the configuration of a data highway system, in which 1 is a communication device with a monitoring function (hereinafter also referred to as a highway monitoring device or SV), 2 and 21 are communication devices (hereinafter also referred to as SN), 3 is the 0 system transmission line (arrow indicates the transmission direction), 4 is the 1 system transmission line (arrow indicates the transmission direction),
5 represents a network diagnostic processor (hereinafter also referred to as NSP).

Figure 4 is a diagram showing an example of a frame, where 6 is a frame, 7 is a 7 frame synchronization pattern (hereinafter also referred to as FH), and 8 is a SV.
9□ to 91 represent data communication slots (hereinafter also referred to as TS) for data communication between the SN and SN (hereinafter also referred to as TS).

In the data highway system having the configuration shown in FIG. 3, the highway monitoring device ti sends a frame 6 frames as shown in FIG. , ~2Il, frame 6
All communications are carried out using the DLCS within. The contents of this communication include instructions from the sV to the SN, status reports from the SN, and the like.

If either the transmission line 3 or 4 is in trouble, one-sided operation is performed using one of the normal ring data transmission lines. In addition, if a failure occurs in the circular data transmission line of both systems in any section, or if the communication equipment stops due to a failure, etc., a loopback is performed to return all transmission lines on both sides of the failed section. Set.

Fig. 5 is a diagram explaining all loopbacks, and 1 to 5 are the same as Fig. 2. Since the section indicated by reference mark A is disconnected, the entire loopback is set at the points indicated by 10 and 11. It shows.

[Problem that the invention seeks to solve]

As shown in FIG. 5, the communication device 2. and 2. When performing loopback operation by turning back the transmission lines at
When the cause of the fault in a part of the section indicated by reference mark A (section indicated by reference mark B in the figure) that was a fault has been eliminated and it becomes usable, the section is incorporated into the system and looped. It is necessary to expand the back section.

In such cases, in conventional data highway systems, the operator had to confirm that the system had recovered and then take action by issuing commands using the network processor. There were problems in that the operability related to maintenance was poor and prompt response was difficult. In addition, if the cause of the failure is an intermittent failure, it may take time to confirm the recovery, or the failure may occur again after it has been incorporated into the system, and the system operation may be disrupted in response to the failure. There were also some problems.

In view of these conventional problems, the present invention provides a method for partially restoring a data highway system when a part of the data highway system is operating in an irregular state due to a fault or the like. In such cases, it is possible to quickly incorporate this into the system and create a state that is as close to normal operation as possible within the conditions at the time. Automatic expansion of the section and the ability to reliably determine whether to recover even if the fault in the section is intermittent, enable easy operation with sympathy and reliable The aim is to provide a highly flexible data highway system.

[Means to solve all problems]

According to the present invention, as described in the claims, a communication device having a monitoring function and a plurality of communication devices are connected by a duplicate data transmission path, and the circular data transmission path In a data highway system in which all communications between communication devices are performed using frames that circulate around the stop, frame synchronization of one of the two systems of circular data transmission paths is performed during the initial settings for each communication device when the device starts operating. means for fully setting a loopback from a system in which frame synchronization can be achieved to the system in which frame synchronization cannot be achieved when frame synchronization cannot be achieved, and means for monitoring the entire state of the circular data transmission path and periodically recording the state information, When a communication device with a monitoring function collects all the status information of the circular data transmission path recorded from the communication device that has set the loopback and determines that both systems of the circular data transmission path are normal, the loopback occurs. This is achieved by a data highway communication method that is characterized by instructing all configured communication devices to cancel loopback.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention,
This figure shows the case where the vermiform data transmission path is an optical fiber.

In FIG. 1, repeaters 16A, 16B (7
) The 0/E converters 17A and 17B Vi capture frames circulating on the 0-system transmission line 12 or 1-system transmission line 14, respectively, and transfer them to the common control 822 via the system changeover switch 21. At this time, the synchronization detection section 19A or 19B performs all frame synchronization detection.

The common system # unit 22 processes all frames of all transferred parties, and also uses the bypass switch f 20A 6 or 20B.
The data is transferred to the F, 10 converter 18A or 18B via the . The E10 converter 18At or 18B converts this into E10 and sends it to the respective thread transmission paths.

The bypass switch 20A or 20B and the system changeover switch 21 are controlled by a common control section 22 to select the system to be used, set loopback, etc.

The common control unit 22 also includes synchronization detection units 19A and 19
The detection result of frame synchronization on the transmission path by B is recorded in the storage unit 22 as transmission path status information.

Regarding the operation of the embodiment shown in FIG. 1, the control of the present invention will be explained.
The system detects the state of each transmission line depending on whether frame synchronization can be detected by the synchronization detection units 19A and 19B, and controls the system changeover switch 21 when the transmission lines of either system are normal. to select one of the systems to be used (in the figure, all cases where the 0 system is selected by the a and c contacts are shown).

Then, the output of the common control section 22 is transmitted to the bypass switch 20.
To the E10 converter 18A through the B and C contacts of A?
The signal is converted to E10 and sent to the A-system transmission line (output) 13.

On the other hand, frames from system 1 transmission line (input) 14 are O/E
After being subjected to 0/E conversion by the converting section 17B, it is converted to E10 by the E10 converting section 18B via the a and c contacts of the bypass switch 20B, and then sent to the B-system transmission line (output) 15 again.

When starting up the device, if frame synchronization of any transmission path is not detected, the common control unit 2ZFi
The normal system is selected by the system switching switch 21, and loopback is set by controlling the bypass switches 20A and 20B.

That is, for example, at startup, the 0 system transmission line (input) 12
frame synchronization is undetectable.

When the 1st system transmission line (input) 14 is normal, the common control unit 22 connects to the C contact 't-b side of the system changeover switch 21, and the bypass switch 20A connects all the connections between the c and b contacts. On the other hand, the a and c contacts of the bypass switch 20E are closed and the output of the common control section 22 is transferred to the E10 converter 18A via the 01b contact of the bypass switch 20A, and the E10 converter], 8A This is converted into E10 and sent to the 0-system transmission line (output) 13. Also, the frame of the 1st system transmission line (input) 14 is simultaneously transferred to the bypass switch 20.
All the a and c contacts of B are connected to E by the E10 converter 18E.
10 conversion and sent to the 1-system transmission line (output) 15.

FIG. 2 is a diagram illustrating the expansion of loopback, 1
-6 and 10.11 are the same as in FIG.

In FIG. 2, for example, when communication devices 1ff14 and 5 are at fault, the section indicated by reference mark A is disconnected, and when communication devices 3 and 6 are operating with loopback settings set, communication device 5 To explain the case where the failure has been recovered, when Tsushin Sae 5 is started up after the failure has been recovered,
Since the frame synchronization of the 0-system transmission line 3 is detected but the frame synchronization of the 1-system transmission line 4 is not detected, a loopback is set as shown at 24 in the figure. As a result, frame synchronization can be detected on both transmission lines of the communication device 6$-t, O system, and 1 system. The results are then recorded in the storage unit as transmission path status information.

When the highway monitoring device receives the status information of the transmission line from the communication device 6 and determines that the status of the transmission line between the communication device 6 and the communication device 5 is normal. , instructs the communication device 6 to cancel loopback.

As a result, the common control unit of Tsushin [6] cancels the loopback that was set at that time.

At this time, the communication device 5 uses the loose back 2 as described above.
4, the loopback section is extended to the range indicated by reference numeral B in FIG. 2, and the unreachable section is reduced to the range indicated by reference numeral C.

〔Effect of the invention〕

As explained above in detail, according to the method of the present invention, when a part of the data highway system is out of order,
When driving under irregular conditions, it is possible to automatically and quickly incorporate this into the system if a part of the affected section is partially restored, and the highway monitoring device It is possible to instruct the corresponding communication device to cancel the loopback after accurately understanding the state of recovery from a line failure, etc., which has the advantage of realizing a highly reliable data highway system. .

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of one embodiment of the present invention, Fig. 2 is a diagram explaining expansion of loopback, Fig. 3 is a diagram showing an example of the configuration of a data highway system, and Fig. 4 is a diagram of a frame. A diagram showing an example, FIG. 5, is a diagram explaining loopback. 1... Communication device with monitoring function, 21~2°...
Communication device, 3...0 system transmission line, 4...l
System transmission path% 5...Network service processor ~ 6°...Frame, 7...Frame 1
1173 M Hatan, 8...Slot for data communication between SV and SN, 91~9° 10.11
．． 24...Display showing loopback settings, 12.
...O system transmission line (input), 13...0 system transmission line (
output), 14...1 system transmission line (input), 15...
・1 system transmission line (output), 16A, 16B...Repeater, 17A, 17B...O/E conversion section, 1
8A, 18B...E10 conversion section, 19A, 19B...
・Synchronization detection section, 20A, 20B... Bypass switch, 21... System changeover switch, 22... Common control section, 23... Storage section 'Masashi Patent Attorney Patent Attorney Sada Igeta - 'Σ. 1.21 Bonro's t Funo Example Block Diagram/Fig.~

Claims (1)

[Claims] In a data highway system in which a communication device with a monitoring function and a plurality of communication devices are connected by a duplicated circular data transmission path, and communication between the communication devices is performed using frames circulating on the circular data transmission path, each communication When frame synchronization cannot be achieved in one of the two systems of circular data transmission lines during initial settings when starting device operation for each device, loopback is performed from the system in which frame synchronization is possible to the system in which frame synchronization cannot be achieved. and a means for monitoring the state of the circular data transmission path and periodically recording the state information, so that the communication device having the monitoring function records the information from the communication device that has set the loopback. The present invention is characterized in that when it collects status information of the circular data transmission path in which it is located and determines that both systems of the circular data transmission path are normal, it instructs the communication device that has set the loopback to cancel the loopback. Data highway communication method.