Regarding the network-level protection switching test of the OTN system, which of the following statement is wrong? (Multiple choice)
A . ODUk-SNCP does not involve a switching protocol, so it can be guaranteed to customers that the test switching time must be less than 50ms.
B . OLP protection group reports the alarm when the power difference between the master and standby channels exceeds 3dB by default, and the maximum can be set to 8dB;
C . OLP master and standby optical power abnormal thresholds exceed 5dB by default to perform switching. The threshold range can be set from -5 to 5
D . In the scenario of OTN carrying SDH multiplex segment ring networking, in order to avoid simultaneous switching of OLP protection and MSP protection, a delay time can be set in the MSP protection group
E . In OLP superimposed on the use of protected ODUk-SNCP protection, in order to avoid SNCP protection switching occurs secondary, you can set delay time in SNCP protection group
Answer: ACD