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質問 1：
The STM-64 has ( ) AU pointers.
A. 64
B. 4
C. 16
D. 1
正解：A
質問 2：
Which of the following statements about overhead bytes is incorrect?
A. E1 and E2 are orderwire bytes. These bytes are used to provide a voice channel for orderwire connections.
B. A1 and A2 are framing bytes. These bytes are used to separate STM-1 frames in a signal flow.
C. B1 is bit interleaved parity-8 (BIP-8). This byte is used to monitor bit errors at the regenerator section layer.
D. 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.
正解：B
質問 3：
Which of the following statements about the EFS4 board are correct? (Multiple Choice)
A. This board supports Layer-2 switching.
B. The board interface an LC interface.
C. This board must be used together with a processing board.
D. This board has four FE ports.
正解：A,D
質問 4：
Compared with a dense wavelength division multiplexing (DWDM) system, a coarse wavelength division multiplexing (CWDM) system provides a certain number of wavelengths and a transmission distance within ( ) km, which greatly reduces system cost and has strong flexibility.
A. 200
B. 100
C. 20
D. 50
正解：B
質問 5：
Optical supervisory channels are intended for the supervisory of WDM optical transmission systems. In UU-T recommendations, 1510 nm wavelengths at a ( ) rate are preferentially used.
A. 192 kbit/s
B. 2 Mbit/s
C. 576 kbit/s
D. 64 kbit/s
正解：B
質問 6：
Which of the following service levels cannot be selected during service configuration?
A. VC12
B. VC4
C. VC8
D. VC3
正解：C
質問 7：
Which of the following statements about basic LCAS functions are correct? (Multiple Choice)
A. An error tolerance mechanism is provided to enhance the robustness of the virtual concatenation function.
B. The bandwidth is dynamically increased or decreased.
C. New NEs and links are automatically discovered.
D. The failure members are protected and recovered.
正解：A,B,D
The STM-64 has ( ) AU pointers.
A. 64
B. 4
C. 16
D. 1
正解：A
質問 2：
Which of the following statements about overhead bytes is incorrect?
A. E1 and E2 are orderwire bytes. These bytes are used to provide a voice channel for orderwire connections.
B. A1 and A2 are framing bytes. These bytes are used to separate STM-1 frames in a signal flow.
C. B1 is bit interleaved parity-8 (BIP-8). This byte is used to monitor bit errors at the regenerator section layer.
D. 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.
正解：B
質問 3：
Which of the following statements about the EFS4 board are correct? (Multiple Choice)
A. This board supports Layer-2 switching.
B. The board interface an LC interface.
C. This board must be used together with a processing board.
D. This board has four FE ports.
正解：A,D
質問 4：
Compared with a dense wavelength division multiplexing (DWDM) system, a coarse wavelength division multiplexing (CWDM) system provides a certain number of wavelengths and a transmission distance within ( ) km, which greatly reduces system cost and has strong flexibility.
A. 200
B. 100
C. 20
D. 50
正解：B
質問 5：
Optical supervisory channels are intended for the supervisory of WDM optical transmission systems. In UU-T recommendations, 1510 nm wavelengths at a ( ) rate are preferentially used.
A. 192 kbit/s
B. 2 Mbit/s
C. 576 kbit/s
D. 64 kbit/s
正解：B
質問 6：
Which of the following service levels cannot be selected during service configuration?
A. VC12
B. VC4
C. VC8
D. VC3
正解：C
質問 7：
Which of the following statements about basic LCAS functions are correct? (Multiple Choice)
A. An error tolerance mechanism is provided to enhance the robustness of the virtual concatenation function.
B. The bandwidth is dynamically increased or decreased.
C. New NEs and links are automatically discovered.
D. The failure members are protected and recovered.
正解：A,B,D
Kotani -
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