The value of the MFAS byte increases with the sequence number of the OTUk/ODUk base frame, and a maximum of ( ) base frames are included.
A. 64
B. 128
C. 256
D. 512
In ITU-T G.692 recommendations, the allowed channel frequency is based on the reference frequency ( ) and the channel spacing can be 100 GHz, 50 GHz, or 25 GHz.
A. 192.1 THz
B. 193.1 THz
C. 194.1 THz
D. 196.1 THz
The STAT indicator of an SDH board is blinking red, on for 100 ms and off for 100 ms. Which of the following is the meaning of the indicator status?
A. Hardware mismatch
B. Hardware fault
C. Normal operating
D. No power supply input
An arrayed waveguide grating (AWG) multiplexer/demultiplexer has the following advantages: short wavelength spacing, large number of channels, and flat passband. It suits DWDM systems with ultra-high speed and large capacity.
A. TRUE
B. FALSE
The SP3D board supports 63 El services.
A. TRUE
B. FALSE
Which of the following ITU-T recommendations defines the OTN frame structure?
A. G.694
B. G.652
C. G.975
D. G.709
The number of bit error blocks on each VC-4 channel is detected by B3 at the receive end. At the same time, the information is sent back to the transmit end through ( ), and HP-REI and HP-FEBBE are reported at the transmit end.
A. K3 (bl-b4)
B. G1 (b5-b8)
C. G1 (bl-b4)
D. J (bl-b4)
Frame-Mapped GFP (GFP-F) is a processing mode oriented to data coding blocks (such as Fiber Channel and ESCON).
A. TRUE
B. FALSE
Which of the following are basic functions of the U2000? (Multiple Choice)
A. Security management
B. Topology management
C. Alarm management
D. Performance management
The difference between a dispersion compensation fiber and a common fiber is that the dispersion compensation fiber has a negative dispersion coefficient at ( ).
A. 1310 nm
B. 1550 nm
C. 800 nm
D. 1650 nm
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