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Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice)
Which of the following options are in the low-loss area of single-mode fiber? (Multiple choice)A . 1310nm _ B. 900nm C.1550nm D.1200nmView AnswerAnswer: AC
Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)
Which of the following elements does a data communication network have in terms of equipment? (Multiple choice)A . Terminal equipment B. Transmission system C. Switching devices D. Core equipmentView AnswerAnswer: ABC
When inserting LCK to the ODUk signal at the local end, what processing will the downstream station system not perform?
When inserting LCK to the ODUk signal at the local end, what processing will the downstream station system not perform?A . Report ODUk_PM_LCK alarm B. Download ODUk_AIS information C. Return ODUk_PM_BDI D. Insert ODUk_PM_LCK alarmView AnswerAnswer: D.
The LDG supports electrical layer scheduling at the ODU1 level.
The LDG supports electrical layer scheduling at the ODU1 level.A . True B. FalseView AnswerAnswer: B
The advantages of WDM mainly include the following. (Multiple choice)
The advantages of WDM mainly include the following. (Multiple choice)A . Large capacity, " transparent" transmission of data B. The system is easy to upgrade, and the existing investment can be protected to the greatest extent when upgrading C. Can fully replace SDH equipment D. Compatible with future all-optical switching...
All bytes in the SDH frame structure will be scrambled.
All bytes in the SDH frame structure will be scrambled.A . True B. FalseView AnswerAnswer: B
The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection .
The half-duplex mode must have a collision detection and avoidance mechanism to avoid the situation where multiple devices seize the line at the same time. This mechanism is the so-called CSMA/CD, and the Chinese name is carrier sense multiple access/collision detection .A . True B. FalseView AnswerAnswer: A
The current sparse wavelength division multiplexing system generally works in the band from 1271nm to 1611nm. Which of the following is the channel spacing?
The current sparse wavelength division multiplexing system generally works in the band from 1271nm to 1611nm. Which of the following is the channel spacing?A . 10nm B. 5nm C. 20nm D. 18nmView AnswerAnswer: C
Both QinQ and MPLS can provide users with L2 VPN service, but QinQ is cheaper and easier than MPLS.
Both QinQ and MPLS can provide users with L2 VPN service, but QinQ is cheaper and easier than MPLS.A . True B. FalseView AnswerAnswer: A
R-LOS, R-LOF, AU-AIS, TU-AIS alarms are all generated and reported on the circuit board.
R-LOS, R-LOF, AU-AIS, TU-AIS alarms are all generated and reported on the circuit board.A . True B. FalseView AnswerAnswer: B
