MSP Protection Switching Time test is done with Customer for STM-16 ring for OSN2500 The switching is initiated by 2 means;
1. Laser Shutdown
2. Physically Removing Patch Cord
RX trigger condition on SDH analyzer is AU_AIS. Laser Shutdown shows the switching time on SDH analyzer 100% of the time without any problem.
While removing the patch cord; sometime the switching time is shown and sometime it is not shown on the SDH analyzer.
1. check the analyzer results for diffrent speed of patch unplug
2. results vary from 1ms to 2,000 msec
3.think that patch removal is BER generator before R_LOS
4. check the ITU standard for switching time
The switching time as stipulated by the ITU-T recommendations excludes the switching detecting time. Usually, the test result includes the switching detecting time. The SF detecting time is usually less than 2 ms, the B2OVER 1E3-3 detecting time is 10 ms, and the SD switching detecting time (1E-6) is 10 s.
when we make MSP switch time check need to differs between SD switch and SF switch conditions