A.Physical connection lacking between boards

B.There is no complete OCh path

C.FEC mode does not match at both ends of the transceiver

D.The channel has been used up

A.The connection network management computer can be connected either directly or through a local area network, as the case may be.

B.If the subrack connection mode is master-slave mode, the network management computer must be connected to the main subrack.

C.Only the gateway network element needs to be connected to the network management computer.

D.All network element IP addresses must be in the same address segment as the network management computer IP address.

A.PWE3 technology belongs to the second layer VLL solution

B.PRE3 technology provides ATM, Ethernet, and TDM services with end-to-end virtual link emulation at the PS network boundary.

C.For PE3 emulation of Ethernet services, PW control words can be manually configured on the PE.

D.The internal data services carried by PWE3 are visible to the core network.

A.EPL

B.VPWS

C.VPLS

D.EPLAN

A.After the outloop is performed, the signals are transmitted to the internal.

B.After the inloop is performed, the signals are transmitted to the external.

C.When performing a hardware loopback on an optical port, you need to add an optical attenuator.

D.The hardware loopback is performed by using the fiber jumper or self-loop cable to perform the loopback on the optical port or electrical port.