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CN101145871B - Method for reducing erroneous alarm generation sequence in SDH service - Google Patents

Method for reducing erroneous alarm generation sequence in SDH service Download PDF

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CN101145871B
CN101145871B CN 200610152044 CN200610152044A CN101145871B CN 101145871 B CN101145871 B CN 101145871B CN 200610152044 CN200610152044 CN 200610152044 CN 200610152044 A CN200610152044 A CN 200610152044A CN 101145871 B CN101145871 B CN 101145871B
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error
bit
generation
warning
sd
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CN101145871A (en )
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干建
罗亚军
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中兴通讯股份有限公司
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Abstract

The invention relates an optical synchronization digital transmission technique, specifically relates to a warning mistake generation sequence and an error switch caused by the occurrence of bit error in a received signal in optical synchronization digital transmission equipment, in particular to a method for realizing SD reduction and EXC warning mistake generation sequences based on the occurrence of the bit error in the received signal in SDH services. According to the detection threshold and the maximum bit error detection time set for the off-limit of the bit error rate and the signal deterioration respectively, the off-limit warning is made, and by setting a timing label, the timing is started and the bit error values are accumulated at the same time when the bit error occurs. The invention has been tested on the equipment in many times, compared with the prior art, is able to obviously reduce SD warning and EXC warning mistake generation sequences, reduces the service SD and SFerror switch events caused by the problem, and thereby reducing the generation rate of SD and SF error switches of the SDH network.

Description

SDH业务中对信号误码降低告警产生次序错误的方法 SDH services generated in the wrong order, the method of reducing the error signal alarm

技术领域 FIELD

[0001] 本发明涉及光同步数字传输技术(SDH),具体而言,涉及一种光同步数字传输(SDH)设备中由于接收信号出现误码造成告警错误产生顺序以及引起的误倒换,特别是一种在SDH业务中基于接收信号出现误码实现降低SD和EXC告警产生次序错误的方法。 [0001] The present invention relates to an optical synchronous digital transmission technology (SDH), particularly, to a Synchronous Digital (SDH) device error occurs due to a received signal sequence error occurs causing the alarm, and the errors caused by switching, in particular an ordering method of error reduction achieved SD error alarm is generated and appear in the EXC SDH service based on the received signal.

背景技术 Background technique

[0002] 为了确保SDH业务传送通路的稳定性,网元设备需要根据特定开销字节值实时检测当前接收到的信号,并且根据信号中的误码大小确定是否产生告警并且执行相应的倒换操作。 [0002] In order to ensure stability of the SDH service transmission path, the network element devices require real-time detection signal is currently received overhead bytes according to a specific value, and determines whether an alarm is generated and a corresponding switching operation performed in accordance with the size of the error signal.

[0003] 根据ITU标准建议,如果出现误码率越限(EXC)告警将触发SF倒换;如果出现信号劣化(SD)告警将触发SD倒换;如果同时出现EXC告警和SD告警,由于EXC告警的优先级高于SD告警,所以根据优先级处理原则,将引起SF倒换。 [0003] According to the ITU standard recommendation, if there is a bit error rate threshold crossings (EXC) will trigger an alarm switching SF; deterioration occurs if the signal (SD) SD switching will trigger an alarm; if simultaneous EXC SD alarm and alarm, since the alarm EXC higher priority than the SD alarm, the principles according to the priority, causes switching SF.

[0004] EXC告警和SD告警体现的是SDH业务中一段时间内的误码和用户设置的检测门限大小情况,而且根据用户设置门限的高低,误码累加时间也不相同,具体可参考ITU标准建议,如表1,2所示。 [0004] EXC SD alarm and alarm are embodied in the SDH service user error and setting a period of time the size of the detection threshold, the user is provided and according to the gate threshold level, the error accumulation time is not the same, specifically refer to ITU standard recommendations, as shown in table 1. EXC告警和SD告警同为误码越限告警,两者的区别在于用户的设置门限值不同,EXC告警门限通常高于SD告警门限,所以出现EXC告警时信号中误码情况更严重。 EXC SD alarm and alarm for the same error limit alarm, the difference is that different threshold values ​​are set user, EXC SD alarm threshold is typically higher than the alarm threshold, so that when the alarm signal EXC more serious error condition.

[0005] 表1 G. 806中对VC-4和VC-3的最大误码检测时间的规定 [0005] 1 G. 806 of the VC-4 and a predetermined maximum error detection time of the VC-3 in Table

[0006] [0006]

Detector threshold Actual BER >10"3 IO4 IO5 IO6 IO7 IO8 IO9IO"3 10 ms IO"4 10 ms 100ms 10_5 10 ms 100ms 1 s IO"6 10 ms 100ms 1 s 10 s 10_7 10 ms 100ms 1 s 10 s 100 s IO"8 10 ms 100ms 1 s 10 s 100 s 1000s IO-9 10 ms 100ms 1 s 10 s 100 s 1000s 10000s Detector threshold Actual BER> 10 "3 IO4 IO5 IO6 IO7 IO8 IO9IO" 3 10 ms IO "4 10 ms 100ms 10_5 10 ms 100ms 1 s IO" 6 10 ms 100ms 1 s 10 s 10_7 10 ms 100ms 1 s 10 s 100 s IO "8 10 ms 100ms 1 s 10 s 100 s 1000s IO-9 10 ms 100ms 1 s 10 s 100 s 1000s 10000s

[0007] 表2 G. 806中对VC_2,VC-12和VC-Il的最大误码检测时间的规定[0008] [0007] Table 2 G. 806 specified maximum error VC_2, VC-12 and VC-Il of the detection time [0008]

Detector threshold Actual BER >10-3 10-4 10-5 10-6 10-7 10-810-3 40 ms 10-4 40 ms 400ms 10-5 40 ms 400ms 4 s 10-6 40 ms 400ms 4 s 40 s 10-7 40 ms 400ms 4 s 40 s 400 s 10-8 40 ms 400ms 4 s 40 s 400 s 4 000 s Detector threshold Actual BER> 10-3 10-4 10-5 10-6 10-7 10-810-3 40 ms 10-4 40 ms 400ms 10-5 40 ms 400ms 4 s 10-6 40 ms 400ms 4 s 40 s 10-7 40 ms 400ms 4 s 40 s 400 s 10-8 40 ms 400ms 4 s 40 s 400 s 4 000 s

[0009] 以10_7的检测门限为例,结合ITU标准建议具体说明EXC告警和SD告警的产生和消失方法:如果用户设定的检测门限为10_7,那么最大误码检测时间为100秒,即在100秒内的任意时刻,如果累加误码数超过了10_7的误码门限值Thr,将产生越限告警,如果到100 秒结束时刻累加的误码值仍然低于门限值Thr,将把累加的误码值清0,重新开始误码累加和判断。 [0009] In 10_7 detection threshold, for example, described in detail in conjunction with the ITU standard recommendation EXC SD alarm and alarm generation and disappearance: If the user sets the detection threshold is 10_7, then the maximum error detection time to 100 seconds, i.e., at any time within 100 seconds, if the accumulated number of errors exceeds the error value of the gate 10_7 Thr, will limit alarm is generated, if the error value of the end time of 100 seconds is still below the threshold value accumulated Thr, will accumulated error value to 0, the accumulated error and restart determination. 如果已经产生了越限告警,那么在100秒结束时刻,如果累加的误码值低于10_7的误码门限值Thr,那么越限告警将消失。 If you have had a limit alarm, then 100 seconds at the end of time, if the accumulated error value is below the limit of error gate 10_7 Thr, then the limit alarm will disappear. 根据表中最大误码检测时间与检测门限的关系,可以推断出不同检测门限的误码门限值Thr大小不相等。 The relationship table maximum error detection time and the detection threshold can be inferred different detection threshold error threshold value Thr not of equal size.

[0010] 在实际处理中如果用户设置的SD和EXC告警的检测门限分别为THR1和THR2 (THR1 =n*THR2,n可能为10,IO2, IO3, IO4, IO5或者IO6),接收信号中存在THR1门限的误码(此时设备应该产生EXC告警),网管上往往先产生SD告警,后产生EXC告警,同时原本应该触发SF倒换的设备却触发了SD倒换,造成了业务的错误倒换。 [0010] If the SD and EXC alarm detection threshold set by the user limits were THR1 and THR2 (THR1 = n * THR2, n may be 10, IO2, IO3, IO4, IO5 or IO6), the received signal is present in the actual processing THR1 threshold error (at this time equipment should generate an alarm EXC), often the first SD alarms are generated on the network, after an alarm is generated EXC, but would have fired SF switching device has triggered SD switching, resulting in an error-switched service.

发明内容 SUMMARY

[0011] 本发明目的在于解决SDH业务中误码越限后SD告警和EXC告警产生次序错误的问题,从而降低由于该问题造成的业务SD,SF误倒换的发生,提高SDH网络运行的自愈性。 [0011] The object of the present invention is to solve the problems in the SDH service errored code EXC SD alarm and the alarm is generated in the wrong order, thereby reducing the traffic problems caused due SD, SF switching error occurs, improving the self-healing SDH network operation sex.

[0012] 本发明具体是这样实现的: [0012] The present invention is specifically implemented as follows:

[0013] 一种SDH业务中对信号误码降低告警产生次序错误的方法,包括: [0013] A service SDH alarms in order to reduce false error signal generating method, comprising:

[0014] 根据为误码率越限和信号劣化分别设置的检测门限值、最大误码检测时间,进行越限告警; [0014] The error rate is more limited and are provided for detecting signal degradation threshold value, the maximum error detection time, a limit alarm;

[0015] 其特征在于: [0015] wherein:

[0016] 设置计时标志,在误码出现时启动计时,同时累加误码值。 [0016] The time stamp is provided, start the timer when the error occurs, while the accumulated error value.

[0017] 所述累加误码值大于检测门限值,产生越限告警,同时清空误码累加值;否则在最大误码检测时间到时后停止计时。 [0017] The accumulated error detection value is greater than the threshold value, generating limit alarm, while empty error accumulation value; otherwise stop the clock time at the maximum when the error detection.

[0018] 所述最大误码检测时间到,清空误码累加值,同时清空计时标志启动的计时,停止计时。 [0018] The maximum error detection time to empty the accumulated value of the error, while emptying time stamp start timing and stop timing.

[0019] 发生越限告警并且计时标志启动的计时为零,在越限告警消失后计时标志启动计时,同时累加误码值。 [0019] occurs and limit alarm time stamp start timing of zero, after the time stamp start time limit alarm disappears and the error accumulation value.

[0020] 发生越限告警并且计时标志启动的计时非零,所述最大误码检测时间到,则清空计时标志启动的计时,停止计时。 [0020] occurs and limit alarm time stamp start timing zero, the maximum error detection time, the time stamp is cleared to start counting, stop counting.

[0021] 如果告警的最大误码检测时间到且累加误码值低于检测门限值,则消失告警,停止计时。 [0021] If the maximum alarm detection time error and the accumulated error detection value is lower than the threshold value, the alarm disappears, stop timing.

[0022] 采用本发明在设备上进行了多次测试,与现有方法相比,可以明显降低SD告警和EXC告警产生次序错误,减少由于该问题造成的业务SD,SF误倒换事件,从而降低SDH网络SD, SF误倒换的发生概率。 [0022] The present invention has been employed in several tests on the device, compared with the conventional methods, can be significantly reduced EXC SD alarm and alarm generation in the wrong order, due to the reduced operational problems caused SD, SF erroneous switching event, thereby reducing SDH network SD, SF switching error occurrence probability.

附图说明 BRIEF DESCRIPTION

[0023] 图1为现有方案EXC告警产生坐标图; [0023] FIG. 1 is a graph generated alarm EXC existing programs;

[0024] 图2为现有方案SD告警产生坐标图; [0024] FIG. 2 is a graph generated alarm conventional SD scheme;

[0025] 图3为本发明的SD,EXC告警产生坐标图; [0025] FIG. 3 of the present invention, SD, EXC graph alarm generation;

[0026] 图4为本发明的告警产生和消失流程图。 [0026] FIG. 4 of the present invention produces the alarm disappears and the flow chart.

具体实施方式 detailed description

[0027] 以坐标图说明现有方案和本发明的SD告警和EXC告警处理过程说明,参考图1,2, 3。 [0027] In the conventional SD alarm graph described embodiment of the present invention and EXC and alarm processes described with reference to FIG. 2, 3. 图中横轴t为时间,纵轴err count为误码累加值。 FIG horizontal axis t is time and the ordinate is the error err count accumulated value. 假设EXC告警和SD告警的检测门限分别为THR1和THR2 (THR1 = 10*THR2),EXC告警的最大误码检测时间为T,则SD告警的最大误码检测时间为10T,实际的误码产生时刻为t1;、可能位于0至T之间的任意时刻。 Suppose EXC SD alarm and alarm detection threshold, respectively THR1 and THR2 (THR1 = 10 * THR2), EXC alarm maximum error detection time T, the maximum error detection SD alarm time 10T, the actual generation of the error time to t1 ;, may be located at any time between 0 and T.

[0028] 现有方案EXC,SD告警处理参考图1,2。 [0028] Existing solutions EXC, SD alarm processing with reference to FIGS. 在检测门限THR1的最大误码检测时间的结束处T时刻,由于误码的累加值可能仍然低于误码门限值Thr,所以将把累加的误码值清0,重新开始误码累加和判断,直至t3时刻误码累加值高于误码门限值,此时将产生EXC告警。 T at the end of the time detection threshold THR1 maximum time error detection, error due to the accumulated value may still be lower than the error threshold Thr, so will the accumulated error value to 0, restart and error accumulation determining, at time t3 until the error accumulated value is higher than the error threshold value, then an alarm will be generated EXC. 由于SD告警最大误码检测时间为10T,所以到达T时刻,误码将继续累加,到达、时刻, 误码累加值超过门限值Thr,产生SD告警,这样SD告警先于EXC告警产生。 Since SD alarm maximum error detection time 10T, so the arrival time T, the error will continue to accumulate, arrival, time, error accumulated value exceeds a threshold value Thr, SD alarms are generated, so that SD alarm before the alarm is generated to EXC.

[0029] 图3为本发明的处理过程,在本发明中EXC告警最大误码检测时间的结束时刻为ti+T,而SD告警最大误码检测时间的结束时刻为、+10*Τ,所以到达T时刻,即使累加的误码值低于误码门限值Thr也不作误码的清空操作,直至t2时刻,EXC告警和SD告警的误码累加值同时超过门限值Thr,同时产生SD和EXC告警。 Process [0029] FIG. 3 of the present invention, in the present invention, the end time alarm EXC is the maximum error detection time ti + T, and the maximum SD alarm end time of error detection time, + 10 * Τ, so arrival time T, even if the accumulated error value is below the threshold value Thr is no error as the error of the flush operation until the time t2, EXC SD alarm and warning error accumulated value exceeds a threshold value Thr simultaneously, while producing SD and EXC alarms. 本发明最大改进点就在于添加了计时启动标志,只有出现了误码,才开始计时统计,对应图3中的从、时刻开始计时和累加误码值等操作。 The biggest improvement is that the point of the present invention is to add a timer start flag, the error appears only before starting the timing statistics, from the corresponding in FIG. 3, the time error accumulated value and starts counting operation. 本发明的具体流程为,可参考图4。 Is a specific process of the present invention, refer to Figure 4.

[0030] 第一步:如果当前没有越限告警而且检测的误码值非0或者误码累加值大于0,则启动计时器,累加告警产生计时,并且分别累加SD和EXC告警误码值,否则至第五步; [0030] The first step: If there is no limit alarm and non-detection of the error value of the error accumulated value is greater than 0 or 0, the timer is started, accumulates the alarm generation time, and are accumulated error value SD and EXC alarms, or to the fifth step;

[0031] 第二步:如果累加的EXC告警误码值大于门限值,则产生EXC告警,同时清空EXC 告警误码累加值,否则执行第四步; [0031] Step 2: If EXC accumulated error value is greater than the alarm threshold value, an alarm is generated EXC, EXC emptied simultaneously trap error accumulated value, otherwise the fourth step;

[0032] 第三步:如果累加的SD告警误码值大于门限值,则产生SD告警,同时清空SD告警误码累加值,否则执行第四步; [0032] Step 3: If the accumulated error value is greater than SD alarm threshold value, an alarm is generated SD, SD alarm emptied simultaneously accumulated error value, otherwise the fourth step;

[0033] 第四步:如果告警的最大误码检测时间到,则清空误码累加值,同时清空告警产生计时;至第八步。 [0033] Step Four: the alarm if the maximum error detection time, the error accumulated value is cleared, while empty alarm generation timing; to the eighth step.

[0034] 第五步:如果已经产生SD和/或EXC告警而且告警产生计时为0,则累加告警消失计时,同时累加误码值;否则至第七步;[0035] 第六步:如果告警的最大误码检测时间到且累加的误码值低于门限值,则消失告警,至第八步; [0034] Step five: If you have to produce SD and / or EXC alarms and alarm generation timing is 0, the cumulative timing alarm disappear, while cumulative error value; otherwise, to the seventh step; [0035] Step Six: If the alarm the maximum error detection time, and the accumulated error value is below the threshold value, the alarm disappears to the eighth step;

[0036] 第七步:如果告警的最大误码检测时间到且告警产生计时非0,则清空告警产生计时。 [0036] Seventh Step: If the alarm time is the maximum error detection and alarm generation timing is not 0, empty alarm generation timing.

[0037] 第八步:关停计时器。 [0037] Eighth Step: shutting down timer.

[0038] 以10_6和10_7的检测门限为例(其中EXC告警的检测门限为10_5,SD告警的检测门限为10_7),结合本文的处理流程说明EXC告警和SD告警的产生和消失方法: [0038] In the detection gate 10_6 and 10_7 limiting example (where EXC alarm detection threshold is 10_5, SD alarm detection threshold is 10_7), incorporated herein processing flow described generation and disappearance methods EXC alarms and SD alarm:

[0039] 第一步:如果当前没有越限告警而且检测的误码值非0或者误码累加值大于0,则启动计时器,累加告警产生计时,并且分别累加SD和EXC告警误码值,否则至第五步; [0039] The first step: If there is no limit alarm and non-detection of the error value of the error accumulated value is greater than 0 or 0, the timer is started, accumulates the alarm generation time, and are accumulated error value SD and EXC alarms, or to the fifth step;

[0040] 第二步:如果累加的EXC告警误码值大于门限值,则产生EXC告警,同时清空EXC 告警误码累加值。 [0040] Step 2: If EXC accumulated error value is greater than the alarm threshold value, an alarm is generated EXC, EXC emptied simultaneously trap error accumulated value. 否则至第八步; Otherwise to step eighth;

[0041] 第三步:如果累加的SD告警误码值大于门限值,则产生SD告警,同时清空SD告警误码累加值。 [0041] Step 3: If the accumulated error value is greater than SD alarm threshold value, an alarm is generated SD, SD alarm emptied simultaneously accumulated error value. 否则至第八步; Otherwise to step eighth;

[0042] 第四步:如果告警产生计时到了10秒,则清空EXC告警的误码累加值,同时清空告警产生计时;如果告警产生计时到了100秒,则清空SD告警的误码累加值,同时清空告警产生计时;至第八步。 [0042] The fourth step: If the alarm is generated to the timing 10 seconds, the alarm is cleared EXC error accumulated value, alarm generation timing emptied simultaneously; alarm is generated if the timer to 100 seconds, the alarm is cleared SD error accumulated value, while Clear alarm generation timing; to the eighth step.

[0043] 第五步:如果已经产生SD和EXC告警而且告警产生计时为0,则累加告警消失计时,同时累加误码值;否则至第七步; [0043] Step five: If you have to produce SD and EXC alarms and alarm generation timing is 0, the cumulative timing alarm disappear, while cumulative error value; otherwise, to the seventh step;

[0044] 第六步:如果告警消失计时到了10秒且累加的EXC告警误码值低于门限值,则消失EXC告警,如果告警消失计时到了100秒且累加的SD告警误码值低于门限值,则消失SD 告警,至第八步; [0044] Step VI: If the alarm disappears and the timer to 10 seconds EXC accumulated error value is below the alarm threshold, the alarm disappears EXC, if the alarm disappears timer to 100 seconds and an accumulated error value is less than the alarm SD threshold, the disappearance of SD alarm to the eighth step;

[0045] 第七步:如果10秒到,且告警产生计时非0,则清空告警产生计时;如果100秒到且告警产生计时非0,则清空告警产生计时。 [0045] Seventh Step: If 10 seconds, and the alarm generation timing is not 0, the alarm generating timing empty; and if 100 seconds to produce an alarm timer is not 0, empty alarm generation timing.

[0046] 第八步:关停计时器。 [0046] Eighth Step: shutting down timer.

6 6

Claims (5)

  1. 1. 一种SDH业务中对信号误码降低告警产生次序错误的方法,包括:为误码率越限设置第一检测门限值、和第一最大误码检测时间,为信号劣化设置第二检测门限值、和第二最大误码检测时间,对于所述误码率越限,在设置的所述第一最大误码检测时间内的任意时刻,如果累加误码值超过了所述第一检测门限值,则产生越限告警,对于所述信号劣化,在设置的所述第二最大误码检测时间内的任意时刻,如果累加误码值超过了所述第二检测门限值,则产生越限告警;其特征在于:设置计时标志,在误码出现时启动计时,同时累加误码值。 An SDH service alert signal is generated to reduce the error in the wrong order, comprising: a first detection-limit threshold value, and the maximum error detection time of a first error rate, the second set of signal degradation the detection threshold, and the second maximum error detection time, the limits to the error rate in the first arbitrary time within the maximum error detection time is set, if the accumulated error exceeds the value of detecting a threshold value, limit alarm is generated, with respect to the signal degradation, in the setting of an arbitrary time within the second maximum error detection time, if the accumulated error detection value exceeds said second threshold value is generated limit alarm; wherein: flag setting timer, start time when the error occurs, while the accumulated error value.
  2. 2.如权利要求1所述的SDH业务中对信号误码降低告警产生次序错误的方法,其特征在于:如果当前没有误码率越限告警或者信号劣化越限告警而且检测的误码值非零或者误码累加值大于零,则累加告警产生计时,并且分别累加误码率越限告警或者信号劣化越限告警的误码值;累加的所述误码率越限告警的误码值大于所述第一检测门限值或者累加的所述信号劣化越限告警的误码值大于所述第二检测门限值,则产生误码率越限告警或者信号劣化越限告警,同时清空误码累加值;否则在所述第一最大误码检测时间或者第二最大误码检测时间到时后,清空累加的误码值,同时清空计时标志启动的计时,停止计时。 2. wrong order SDH service method according to an alarm signal is generated to reduce the error claim, wherein: if no error rate limit alarm or signal degradation and error limit alarm value detected non error accumulated value of zero or greater than zero, the accumulation alarm generation time, and are accumulated error rate limit alarm signal degradation or BER-limit value of the alarm; the error rate threshold crossings accumulated error value is greater than the alarm detecting the first threshold value or the accumulated value of the error signal degradation-limit alarm is greater than the second detection threshold, generating error rate limit alarm limit alarm or signal degradation, while empty error code accumulated value; otherwise, the maximum error in the first or the second maximum detection time when the error detection time, emptying the accumulated error value, while emptying time stamp start timing and stop timing.
  3. 3.如权利要求2所述的SDH业务中对信号误码降低告警产生次序错误的方法,其特征在于:如果发生误码率越限告警或者信号劣化越限告警并且计时标志启动的计时为零,累加告警消失计时,同时累加误码值;如果所述第一最大误码检测时间或者所述第二最大误码检测时间到且累加的误码值低于门限值,则消失告警。 3. The method of sequence errors of the SDH service 2 generating an alarm signal to reduce the error claim, characterized in that: if the error rate limit alarm occurs or signal degradation and limit alarm time stamp start timing zero , the accumulation timer alarm disappears, while the accumulated error value; if the maximum error detection time of the first or the second maximum error detection time, and the accumulated error value is below the threshold value, the alarm disappears.
  4. 4.如权利要求3所述的SDH业务中对信号误码降低告警产生次序错误的方法,其特征在于:如果所述第一最大误码检测时间到且误码率越限告警产生计时非0或者所述第二最大误码检测时间到且信号劣化告警产生计时非0,则清空计时标志启动的计时,停止计时。 4. The SDH services claim 3 for reducing the error alarm signal sequence generating method as claimed in claim error, wherein: if the first error detection time, and the maximum error rate limit alarm generation timings nonzero or said second maximum error detection time and the signal deterioration of the alarm generation timing is not 0, the emptying time stamp start time, stop the timer.
  5. 5.如权利要求1所述的SDH业务中对信号误码降低告警产生次序错误的方法,其特征在于:如果所述第一最大误码检测时间或者所述第二最大误码检测时间到且累加误码值低于检测门限值,则消失告警,停止计时。 5. The method of wrong order SDH services according to an alarm signal is generated to reduce the error claim, wherein: if the first error detection time of the maximum or the second maximum error detection time, and accumulated error value is below the detection threshold, the disappearance of an alarm, stop the clock.
CN 200610152044 2006-09-12 2006-09-12 Method for reducing erroneous alarm generation sequence in SDH service CN101145871B (en)

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US5606563A (en) 1995-05-18 1997-02-25 Pmc-Sierra, Inc. Programmable jump window for sonet compliant bit error monitoring

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US5606563A (en) 1995-05-18 1997-02-25 Pmc-Sierra, Inc. Programmable jump window for sonet compliant bit error monitoring

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