KR100352848B1 - Apparatus for error checking of multiframe indicator byte in communication system - Google Patents

Abstract

The present invention automatically detects the error of H4 data in the transmission system that handles the E1 / T1 signal and notifies the operator and the monitoring board so that the system administrator can immediately respond to diagnose the cause and problem of the error and recover the system. An object of the present invention is to provide an apparatus for diagnosing an error of a multiframe indication byte in a transmission system. A frame sequence error diagnosis unit for declaring an error; Receiving the frame order error declaration is composed of a frame order maintaining unit for maintaining the frame order according to the existing multi-frame data, it is possible to diagnose the abnormality of the system and the smooth operation of the equipment through the diagnosis of normal status of the H4 data. .

Description

Error diagnosis device of multiframe indicator byte in communication system {Apparatus for error checking of multiframe indicator byte in communication system}

The present invention relates to error checking of H4 data, which is a multiframe indicator byte of a transmission system. In particular, in a system handling an E1 / T1 signal, an error of H4 data is automatically detected and notified to an operator and a monitoring board. The present invention relates to an apparatus for diagnosing errors of a multi-frame indication byte in a transmission system in which a system administrator immediately responds to diagnose a cause and a problem of an error and recover a system.

In general, in a transmission system that handles an E1 signal in Europe or a T1 signal in North America, a multi-frame concept in which four frames constitute one frame is introduced.

At this time, the multi-frame is not transmitted randomly but must be transmitted in a certain order so that the device receiving the frame can recover the signal normally. In this case, when four frames constitute a multiframe, the data indicating the order between the frames is the multiframe indication byte.

The multiframe indication byte is generally referred to as H4 data, and indicates the order of four frames as the last two bits of the eight possible bits. For example, '00' is the first frame, '01' is the second frame, and '10' is the third frame. The order of each frame is indicated.

As such, the H4 data indicating the order between frames plays a role of indicating a pointer of the E1 / T1 signal.

The present invention is to check the error occurred on the H4 data, the prior art will be described as follows.

First, Figure 1 is a block diagram of the H4 data processing of the transmission system according to the prior art.

As shown in FIG. 1, the prior art only includes a function unit for performing processing of H4 data, and a function for diagnosing or detecting an error occurring on the processed H4 data is not implemented.

That is, in the related art, the frame signal output unit analyzes the input H4 data, extracts pointers to four frames, and outputs frame data according to the pointers.

However, the function of the frame signal output unit is implemented by an application specific integrated circuit (ASIC), which is a fatal system error due to an error occurring in the H4 data because it does not have a function of recognizing the data corruption of the error occurrence factor of the input H4 data. There was a problem that can occur.

In other words, when H4 data is broken due to various factors such as data transmission error, heat generated during operation of the system, or environmental causes, there was no means for diagnosing and immediately responding.

In particular, when normal data is input in the transmission system, it operates normally. However, when the IC malfunctions due to heat or excessive current or when the H4 data is broken due to environmental factors, abnormal data may be transmitted. .

In addition, the system operator could not detect whether the data flowing in the current system is normal or abnormal, and could not take appropriate measures to prevent the system error, and could only perform post-processing after the error occurred.

In addition, a problem that could be mistaken for the current system status in the surveillance board could cause serious problems in overall system operation and data transmission. Considering that the data transmission reliability of the transmission system is a very important issue, the above problem of the prior art may be an important technical shortcoming.

The problem of the prior art illustrated above can be overcome by providing a series of means for diagnosing an error occurring on H4 data and notifying the operator or the monitoring board of the error occurring in the H4 data.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, an object of the present invention by automatically detecting the error of the H4 data in the system for handling the E1 / T1 signal by notifying the operator and the monitoring board The present invention provides an error diagnosing device for a multi-frame indication byte in a transmission system that is immediately suitable for a system administrator to diagnose the cause and problem of an error occurrence and to recover the system.

In order to achieve the above object, in the transmission system according to the present invention, the apparatus for diagnosing an error of a multiframe indication byte monitors received multiframe data to detect a frame order error when a frame that is not suitable for the order of the multiframe is diagnosed. A frame sequence error diagnosis unit for declaring a signal; When the frame order error declaration is received, the technical feature is that the frame order holding unit is configured to maintain the frame order according to the existing multiframe data.

1 is a block diagram of an H4 data processing of a communication system according to the prior art,

2 is a block diagram of an apparatus for diagnosing an error of a multi-frame indication byte in a communication system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

21: frame order error diagnosis unit 22: frame order maintenance unit

23: frame damage diagnosis unit 24: frame restoration unit

Hereinafter, the configuration and operation of the present invention will be described based on an embodiment according to the spirit of the apparatus for diagnosing an error of a multi-frame indication byte in the above transmission system.

2 is a block diagram of an apparatus for diagnosing an error of a multi-frame indication byte in a transmission system according to an embodiment of the present invention.

The device proposed by the present invention implements a function of monitoring H4 data to diagnose an error occurring therein and notifying an operator or a monitoring board of an error occurrence.

Specific functional blocks for implementing such a function are shown in FIG.

A preferred embodiment of the present invention comprises largely four functional blocks,

A frame order error diagnosis unit 21 for declaring an out-of-multiframe when a frame that is not suitable for the order of the multiframes is diagnosed by monitoring the received H4 data; A frame order holding unit 22 for maintaining the frame order according to the existing H4 data upon receiving the frame order error declaration; A frame corruption diagnosis unit 23 for declaring a frame corruption (Loss-of-Multiframe) when it is confirmed that frame error of the H4 data continues after the frame order error declaration state continues; If the normal state of the continuous frame is confirmed in the frame damage declaration state, a frame restoration unit 24 for releasing the frame damage declaration and applying the frame order according to the current H4 data.

The operation of the device configured as described above is as follows.

The present invention is to diagnose whether the multi-frame order of the H4 data received from the outside is correct and to take appropriate measures according to the diagnosis, the diagnosis of the multi-frame order is to diagnose the frame sequence error and damage the frame It is roughly classified as a diagnosis.

That is, H4 data is a multi-frame consisting of four frames in a certain order, and errors that can occur are caused by one or two frames and three or more frames depending on the severity thereof. It is distinguished by an order error.

The classification according to the deepening degree of the order error is because it is necessary to take appropriate measures differently. Thus, an order error caused by one or two frames is called a frame order error, and an order error caused by three or more frames is called a frame corruption.

In other words, the order error caused in one or two frames means that the H4 data is not broken continuously but is intermittently broken. Since these errors can be judged to be caused by various environmental factors rather than fatal errors of the system, the existing H4 data is maintained and the frame order of the existing stable H4 data is maintained without applying the frame order.

On the other hand, in the case of an order error caused by three or more frames, a condition in which three or more H4 data are broken continuously is not a temporary error caused by an error factor, but a frame is damaged, so that an operator or a monitoring board can take appropriate measures. Make sure

It will be described in more detail.

When the H4 data consisting of four frames is received, the order of the H4 data must be determined and the four frames must be separated according to the order. The apparatus according to the present invention is applied in connection with a functional block for performing such frame separation.

First, the frame order error diagnosis unit 21 monitors H4 data input from the position of the H4 data activation signal to diagnose whether there are any frames that do not match the order of the multiframes.

So if any frame out of order is found, it declares an out-of-multiframe (abbreviated as OOM).

The declared frame order error OOM is a signal for controlling the function of the frame order maintaining unit 22. The frame order maintenance maintains the frame order based on the existing H4 data upon receiving the OOM. That is, the frame order is maintained according to the H4 data which previously had the normal frame order without determining the frame order based on the current H4 data.

The reason why the frame order maintaining unit 22 maintains the existing frame order according to the frame order error declaration is as described above. This frame ordering prevents frame loss or system error even when a temporary frame order error occurs.

Therefore, when the frame order error (OOM) is declared, the frame order maintaining unit 22 inputs the current H4 data and separates and outputs each frame data according to the frame order of the existing H4 data.

The frame order error declaration OOM transmitted by the frame order error diagnosis unit 21 is transmitted to the frame damage diagnosis unit via the frame order maintenance unit 22.

When the frame damage diagnosis unit 23 receives the frame order error declaration (OOM), the frame damage diagnosis unit 23 confirms that there is an order error in the currently input H4 data and continuously checks the frame order of the H4 data. Therefore, when it is confirmed that there is a continuous error in the frame order of the H4 data, a frame corruption (Loss-of-Multiframe, hereinafter abbreviated as LOM) is declared.

In this case, the declaration of frame corruption (LOM) is preferably made after confirming three consecutive frame order errors. The meaning of this frame damage declaration and its requirements are as described above.

Thus, the frame damage declaration (LOM) transmitted by the frame damage diagnosis unit 23 is input to the frame restoration unit and notified to the system operator or the monitoring board. This is because the damage of the frame may not be overcome to the extent of maintaining the existing frame order as in the case of the frame order error.

Appropriate measures are taken according to the frame damage declaration (LOM) to overcome the damaged state of the frame, and the frame restoration unit 24 determines whether the frame is damaged. That is, the frame restoring unit 24 having received the frame corruption declaration (LOM) monitors the currently input H4 data and determines that the damaged state of the frame is restored when three consecutive frames are normal.

In addition, when the frame restoring unit 24 confirms that the multi-frame is restored to its normal state, the frame restoring unit 24 releases the frame damage declaration LOM and the frame order error declaration OOM and then inputs the current input H4. Data frames are output according to the frame order by the data.

In addition, the frame restoration unit 24 performs a function of outputting frame data according to the current H4 data even when the frame sequence error diagnosis unit does not diagnose the frame sequence error.

As described above, the apparatus according to the present invention can diagnose the sequence error of the H4 data or the damage of the multiframe when the H4 multiframe data is used in the system for processing the E1 / T1 signal, and take appropriate measures therefor. Loss of data and malfunction of the system can be prevented.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the transmission system according to the present invention, the error diagnosis apparatus of the multi-frame indication byte can diagnose whether the H4 data is normal, so that the operator can immediately detect abnormal requirements of the system and take appropriate measures. There is. The above effects have an important meaning in a transmission system requiring high reliability in data transmission.

In addition, by performing continuous error diagnosis during abnormal H4 data input, if temporary sequence error is caused by environmental error factors, the frame can be output according to stable H4 data frame order, which can have a fatal effect on the system. The factor has the effect of being able to eliminate it. In addition to these effects, smooth operation of the equipment is possible.

The present invention is also applicable to all ASICs that handle T1 / E1 signals in a multiframe concept. In particular, there is an embodiment applied to a Tributary Unit Pointer Processor (TUPP) in a development state.

Claims (4)

A frame sequence error diagnosis unit for monitoring an received multiframe data to declare an out-of-multiframe when a frame that is not suitable for the order of the multiframes is diagnosed; A frame order maintaining unit for maintaining a frame order according to existing multiframe data upon receiving the frame order error declaration; A frame corruption diagnosis unit for declaring a frame corruption (Loss-of-Multiframe) when it is determined that the frame sequence error declaration state continues and the frame errors of the multiframe data continue; If the normal order of successive frames in the frame corruption declaration state is confirmed, a multi-frame in the transmission system comprising a frame recovery unit for releasing the frame corruption declaration and applying the frame order according to the current multi-frame data Error diagnosis device of indication byte. The method of claim 1, wherein the multiframe data, In handling E1 / T1 signals, H4 data is composed of four frames as one multiframe, Indicates a frame order of the H4 data as an H4 indication byte, Diagnosis of the sequence error of the multi-frame data is an error diagnosis apparatus for a multi-frame indication byte in the transmission system, characterized in that through the error diagnosis of the H4 indication byte. The method of claim 1, Frame order error declaration of the frame order error diagnosis unit, An apparatus for diagnosing errors in a multiframe indication byte in a transmission system, characterized in that it is declared when there is at least one frame that is not suitable for the order of the multiframe. The method of claim 1, wherein the frame damage diagnosis unit and the frame restoration unit, The frame damage diagnosis unit declares frame damage when diagnosing three consecutive sequence errors by diagnosing whether frame sequence errors of the currently input multi-frame data are continuous in the frame sequence error declaration state. The frame recovery unit diagnoses the frame order of the currently input multiframe data in the frame damage declaration state, and declares the frame damage release when the sequence of three consecutive frames is normal. Error diagnosis device.