The last 256 columns in the OTN frame structure are FEC areas, which are used for forward error correction.
A. TRUE
B. FALSE
Automatic laser shutdown (ALS); When no optical signal is received, the ALS function automatically shuts down the corresponding optical module. This function protects onsite maintenance personnel.
A. TRUE
B. FALSE
According to the formula of "ODUk rate = 239/(239-k) x STM-N frame rate", the ODU4 rate is equal to 239/235 x STM-N frame rate.
A. TRUE
B. FALSE
The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.
A. TRUE
B. FALSE
During service configuration, there are two timeslot modes. Huawei uses the interleaved timeslot mode by default.
A. TRUE
B. FALSE
The number of 0DU2e signals multiplexed into an 0DU3 signal is the same as that of 0DU2 signals multiplexed into an 0DU3 signal.
A. TRUE
B. FALSE
The section overhead of STM-4 is () bytes/frame.
A. 9*9*4
B. 9*8*4
C. 9*9*8
D. 9*8
Which of the following device domains can be managed by the U2000? (Multiple Choice)
A. Transport device
B. Wireless device
C. Data communication device
D. Access device
Which of the following statements about overhead bytes is incorrect?
A. A1 and A2 are framing bytes. These bytes are used to separate STM-1 frames in a signal flow.
B. J0 is a regenerator section trace byte. This byte is used to repeatedly transmit a section access point identifier, so that the receive end can verify its continuous connection to the specified transmit end.
C. B1 is bit interleaved parity-8 (BIP-8). This byte is used to monitor bit errors at the regenerator section layer.
D. E1 and E2 are orderwire bytes. These bytes are used to provide a voice channel for orderwire connections.
Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?
A. Current frame
B. Next frame
C. Previous frame
D. None of the above
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