A.Service is the service layer of the PW, PW is the service layer of the Tunnel, and Tunnel is the service layer of the Section.

B.Section is the service layer of the tunnel, Tunnel is the service layer of the PW, and PW is the service layer of the Service.

C.Tunnel is the service layer of PW, PW is the service layer of Service, and Service is the service layer of Section.

D.Section is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Service.

A.Avoid communication by extended ECC mode between each subnet gateway network element.

B.When setting the ECC extended mode remotely, you must ensure that the settings are correct in order. Otherwise, the unmanaged network element will not automatically resume communication with the network management system and must be reset to the site.

C.The ECC extension mode of the remote NE must be modified first, and then the ECC extension mode of the gateway NE is modified.

D.It is not recommended to set the gateway NE as the server. It is recommended to set the NE closest to the gateway NE as the server NE.

A.ODUkP is responsible for calculating BIP-8, writing PM, GCC1/2 and other overheads.

B.OPUk performs client signal mapping, rate adjustment and rate adaptation in the transmission direction.

C.OTUk is responsible for calculating BIP-8, writing to SM, GCCO, FAS, MAFS, etc.

D.ODUkT calculates BIP-8 and writes to TCHi.

A.The OPUk performs client signal mapping, frequency adjustment, and rate adaptation in the transmit direction.

B.The ODUkT calculates the BIP-8 and writes the it into the TCMi.

C.OTUk calculates BIP-8 and writes it into SM, GCCO, FAS, and MAFS.

D.The ODUkP calculates overheads such as BIP-8, PM, and GCC1/2.