A.True

B.False

A.The fiber attenuation is too large.

B.Use of Demultiplexer Multiplexer

C.Use of EDFA

D.New optical fiber is not used.

A.Accessing G.703 64 kbit/s co-directional service signals through the DB44 interface on the DM12 board

B.One DX1 board can be used with two DM12

C.Electrical signal input and output interfaces for DDN, Unframed E1 and sub-rate services

D.Access the NX6bit/s and sub-rate service signals through the DB28 connector on the DM12 board.

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

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

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

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

A.The value of the AU-PTR pointer is placed in the last 10 bits of the HI and H2 bytes. Therefore, the valid value of the AU-PTR pointer is 0-1023.

B.The root cause of the AU pointer justification is that the clocks of the upstream and downstream stations are not synchronized.

C.AU-PTR indicates the position of the JO byte.

D.If the receive end detects that the H1H2 bytes are "1", the local end generates the AU-AIS alarm.