Forced switching, fiber cut switching, manual switching, and exercise switching are in the descending order of priority.
A. TRUE
B. FALSE
When a fiber cut test is performed on a normal MSP ring, which of the following alarms is reported? (Multiple Choice)
A. TU-AIS
B. R-LOS
C. APSJNDI
D. BD STATUS
Which of the following statements about the 1+1 protection of cross-connect boards are correct? (Multiple Choice)
A. The source service board sends services to the active and standby cross-connect boards.
B. After service cross-connections are completed, the active and standby cross-connect boards send the data of the active cross-connect board to the sink service board.
C. The sink service board can receive only the data from the active cross-connect board.
D. The buses of the two cross-connect modules work independently and do not interfere with each other.
E. The dual-bus system structure indicates that the service board performs dual feeding of data to the cross-connect side and selective receiving of the data on the cross-connect side.
F. Two cross-connect boards have the same configuartion. Service boards will selectively receive services from one of them based on the quality of services and status of cross-connect boards.
The frame period of OTN signals is fixed, which is the same as that of SDH signals.
A. TRUE
B. FALSE
By default, the B2-EXC alarm is reported when the number of B2 bit errors exceeds the ( ) threshold.
A. 0.000000001
B. 0.00001
C. 0.001
D. 0.01
Which of the following are the device-level protection schemes of SDH products? (Multiple Choice)
A. Power supply protection
B. Cross-connect and timing board protection
C. System control board protection D. TPS protection
The rates of the SF64 and SL64 boards are both STM-64. Therefore, the two boards can be interconnected.
A. TRUE
B. FALSE
According to ITU-T recommendations, the requirement that the MSP switching time should be within 50 ms is conditional. For example, the number of NEs on an entire ring network is less than 16.
A. TRUE
B. FALSE
OChr means that the electrical supervisory technology is used.
A. TRUE
B. FALSE
The device IP addresses of the gateway NE and non-gateway NEs must be set in the same network segment.
A. TRUE
B. FALSE
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