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FAQ-why N1EMS4 board services interrupt for a few seconds with LCAS when delete part service cross connection

Publication Date:  2012-07-25 Views:  37 Downloads:  0
Issue Description
One day, customer report that they configurate a EPL service use  N1EMS4 board, use one VCTRUNK to bind 8 VC4, and the 8 VC4 use different trail,LCAS is also 
enabled. when customer delete one VC4 trail, all the services will interrupt for 4-5 seconds.
  NE version: 5.21.18.50p01
 board version: 7.15
Alarm Information
LCAS_PLCR, HP_UNEQ, LCAS_PLCT,  ALM_GFP_dLFD    
Handling Process
Because the LCAS can't protect service without interrupt when there is SDH alarm, so use SNCP to protect the service.
Root Cause
When board enable LCAS, if VCTRUNK add or increase bind bandwidth dynamicly, services won't interrupt, but when fiber cut or cross connection delete or other 
problem happen, there is several factors which will affect services resume time,
1, alarm detect, when there are some problem happen, such as fiber cut, delete service. LCAS will get the alarm from line board after a few time;
2,protocel function, when protocel get the alarm, it need time to have function;
3,services resume, services resume also need a few time.
So, services interrupt for a few seconds is normal when cross connection is deleted.
Suggestions
When LCAS is enable, when SDH problem happen such as fiber cut, lose cross connection or other problem, services need several seconds to resume.

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