Kenji
Check my reply on the topic”Abrupt nature of SDCCH Blocking in N/W”.
Austin
This ratio is set in BSC .The parameter name is “ALSDC”.The recommended value is 30%.
To handle this alarm,you can check the following
1.If any TRX containing SDCCH has gone faulty or blocked.
2.If the parameter ALSDC is set too high.
3.Wheteher Dynamic SDCCH is disabled
Br\\
Bijoy