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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
Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)
Compared with traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice)A . Meet the transmission bandwidth requirements of each optical Tb/s through the wavelength division function B. Provide 2.7G b /s, 10.7G b /s, 43G b /s and even 111.8G b /s high-speed interface...
Which of the following is correct for optical amplifiers and regenerators? (Multiple choice)
Which of the following is correct for optical amplifiers and regenerators? (Multiple choice)A . Higher regenerator cost B. When the regenerator works at a specific bit rate and a specific frame format C. Where the amplifier can work at any bit rate and frame format D. Optical amplifiers are rarely...
Physical port: also known as MAC port, is the external port of the board.
Physical port: also known as MAC port, is the external port of the board.A . True B. FalseView AnswerAnswer: A
Regarding the processing of data frames by the data board port, which of the following is correct? (Multiple choice)
Regarding the processing of data frames by the data board port, which of the following is correct? (Multiple choice)A . The port set as the tag Aware attribute can only discard the data without vlan tag B. Hybrid ports can realize mixed transmission of tag and untag services C. When...
