Free Huawei H31-311-ENU Exam Dumps Questions & Answers

The fiber core refractive index n1 must be Q the cladding layer refractive index n2, which is a necessary condition for transmitting optical signals in optical fibers.

• A.equal to
• B.higher than
• C.lower than

Which of the following is the frame structure of STM-16?

• A.9*270*64
• B.9*270*16
• C.9*270*1
• D.9*270*4

The receive end performs BIP-8 check for the unscrambled STM-16 frame. If the BIP-8 check result XOR the value of the B1 byte contained in the following STM-16 frame is 10001100, it indicates that ( ) bit error blocks exist in the STM-16 frame.

• A.5
• B.3
• C.Unclear
• D.6

Which of the following statements about overhead bytes is incorrect?

• A.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.
• B.B1 is bit interleaved parity-8 (BIP-8). This byte is used to monitor bit errors at the regenerator section layer.
• C.E1 and E2 are orderwire bytes. These bytes are used to provide a voice channel for orderwire connections.
• D.A1 and A2 are framing bytes. These bytes are used to separate STM-1 frames in a signal flow.

The SP3D board supports 63 E1 services.

• A.TRUE
• B.FALSE