JPH04337937A - Device inside monitoring system for transmitter - Google Patents

Abstract

PURPOSE:To more speedily evaluate a fault when the fault occurred at the transmitter of digital signals. CONSTITUTION:When any fault is detected by fault detection circuits 7-18 provided in multistage packages 3-6, signals patterns made various for fault points or fault contents are inserted into the idle time slots of a main signal and transferred into the downstream of a communication path. A device inside alarm part 28 executes communication only with the final stage package of the communication path and collects all the monitor information in the device according to the fault result at this package and the detected result of the specified pattern.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal monitoring method for a transmission device used in digital communications.

0002

[Prior Art] Conventionally, transmission devices for digital communication include
As shown in FIG. 2, there is one in which a plurality of packages 53 to 56 are connected in multiple stages.

[0003] In this transmission device, main signals 51 and 52 are input to a package 53 connected to a transmission path, and thereafter, the signals are sequentially sent to downstream packages 54 to 56 via an internal communication path, and the output side It is sent to the outside through the transmission line. The package 53 detects transmission path failures such as signal interruption and frame synchronization loss.

In addition, there are failure detection circuits 57 to 68 in the input/output section of each package and inside the package, which detect disconnection of signals within the device, test pattern check using empty time slots of the main signal, and parity check (code identification)
It is now possible to detect failures within the device.

On the other hand, an internal alarm unit 78 having a CPU
communicates with each package to collect monitoring results,
If a failure is detected, the failure lamp (
73 to 76) Turn on the lights and send an alarm to an in-station monitoring and control device outside the device.

[0006]Furthermore, with regard to in-device monitoring systems, there are many systems in which the signal is rebuilt or the test pattern or parity is reinserted at the failure detection point.

[0007] This is to prevent a failure from spreading downstream in the communication path within the device and to facilitate identification of the failure location.

[0008]

[Problems to be Solved by the Invention] In the above-mentioned conventional internal equipment monitoring system, the signal is rebuilt at each fault detection point, so the alarm unit receives fault detection results from all monitoring points within the equipment. must be collected.

[0009]Furthermore, since failure detection is carried out using the above-mentioned method while sequentially evaluating the details of the failure from the upstream side of the internal communication path, it takes time for the failure evaluation to reach the end of the communication path. Failure evaluation results also tend to be localized.

[0010] Moreover, this tendency becomes more pronounced as the transmission equipment becomes larger and more complex, and the route for collecting monitoring results becomes more complex, and it takes a lot of time to process failure information. This makes quick failure assessment difficult.

[0011]

[Means for Solving the Problems] The in-device monitoring method of the present invention provides means for detecting failures in the transmission line and various parts within the device in a digital signal transmission device connected to an external transmission line; Means for inserting a signal pattern specified for each failure detection point and failure content using an empty time slot of the main signal and transmitting it to the downstream of the internal communication path, and a package located at the final stage of the internal communication path. and means for detecting the signal pattern and transmitting failure information to the device instructed by the signal pattern via an in-device alarm section.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention.

In this embodiment, a digital signal transmission device is constructed of a plurality of packages connected in multiple stages.

In this case, it is assumed that the main signals 1 and 2 are transmitted in one direction within the device (eg, from left to right).

In the figure, numerals 3 to 6 indicate each package within the device. The package 3 detects transmission path failures such as signal interruption and frame synchronization loss.

In addition, there are failure detection circuits 7 to 18 in the input/output section of each package and inside the package, which detect disconnection of signals within the device, test pattern check using empty time slots of the main signal, and parity check. It is now possible to detect failures within the device.

In addition to the above internal monitoring function, fault information is newly transferred to the downstream of the internal communication path using another free time slot (for example, 1 byte = 8 bits) of the main signal.

When a failure is detected at each monitoring point, a specific signal pattern is inserted into this empty time slot,
Transfer to the downstream of the internal communication path. As the specific signal pattern, a different pattern is selected for each failure detection point and failure content.

For example, when the failure detection circuit 7 detects frame synchronization, "10000000" is inserted,
When the failure detection circuit 11 detects an internal parity error, "00001000" is inserted. Similarly,
Unique insertion patterns are defined for other failure detection circuits as well.

Regarding the time slots to be inserted, only a specific pattern is inserted at each monitoring point when a failure is detected, and the signal is not reconstructed.

Furthermore, the final detection circuit 18 of the package 6 located at the final stage of the intra-device communication path detects the specific pattern in addition to the conventional monitoring contents.

On the other hand, an internal alarm unit 28 having a CPU
communicates only with the final stage package 6 of the communication path, and collects all monitoring information within the device from the failure result here and the detection result of the specific pattern.

For example, when the above failure detection circuit 18 detects "10000000" in the time slot of the main signal, it is determined that frame synchronization has been detected in the package 3, and when "00001000" is detected, , it is determined that a parity error has been detected inside package 4.

[0024] According to the above detection result, the alarm unit 28
The failure lamp (23 or 24 in the above example) of the package is turned on, and an alarm is transmitted to an internal monitoring and control device outside the device.

[0025]

[Effects of the Invention] As explained above, in the in-device monitoring system of the present invention, in addition to the conventional in-device monitoring function, each monitoring section
Since the fault information is transferred to the downstream of the internal communication path using another empty time slot in the main signal, the internal alarm unit 2
8 is based on the monitoring result of the package 6 at the final stage of the communication path.
All monitoring information within the device can be collected.

[0026] That is, it is possible to quickly and comprehensively grasp the failure status of the communication path in the transmission device from upstream to downstream. Therefore, for large-scale and complex transmission equipment,
Adopting the in-device monitoring method of the present invention has the effect of simplifying the path for collecting monitoring information, shortening the time for collecting and processing information, and enabling prompt failure evaluation. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram of a conventional example.

Claims (1)

[Claims] Claim 1: In an in-device monitoring method that monitors a transmission device that outputs a main signal arriving from a predetermined direction through a transmission path to the downstream side via an in-device communication path,
A means for detecting failures in the transmission path and various parts within the device, and using empty time slots of the main signal at the time of failure detection to transfer signal patterns specified for each failure detection point and failure content to the downstream of the communication path within the device. and means for receiving the output of the transmission device, detecting the specific signal pattern, and transmitting failure information to a device indicated by the signal pattern. Monitoring method.