The difference between a dispersion compensation fiber and a common fiber is that the dispersion compensation fiber has a negative dispersion coefficient at ( ).
Which of the following overhead bytes needs to be processed at an electrical regeneration site?
Which of the following is the frame whose VC-4 J1 byte is indicated by the current frame's AU pointer?
After PDH services are configured on a per-NE basis, a complete trail cannot be searched out. Which of the following are possible causes? (Multiple Choice)
Which of the following overheads is not an ODUk overhead?
The Kl and K2 bytes can transmit APS switching signaling, and can also indicate that the multiplex section signal fails.
A PAUSE frame uses a reserved multicast address and is not forwarded by a bridge or switch, In this way, the PAUSE frame does not generate any additional information.
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?
When the U2000 data is backed up using scripts, the backup is fast because the backup files are small.
Which of the following layers defines the protocols that control the network layer? The protocols of the layer work on logical links, that is end-to-end connections between two devices.
Which of the following is not the advantage of WDM?
When the ACT indicator of an SDH board is off, it indicates that this board has a hardware fault and cannot be used,
The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.
Which of the following statements about the definition of SDH is correct?
Some of the SNCP protection switching conditions are default, such as AU-AIS and TU-AIS. Others conditions are optional, such as HP-TIM and HP-SLM. The optional conditions can be flexibly set based on service levels.
In the case of 1+1 linear MSP, which of the following switching modes do not require the enabling of the APS protection protocol? (Multiple Choice)
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.
Which of the following can be the center wavelengths of the pump sources in an EDFA? (Multiple Choice)
Which of the following logical functional modules are involved in processing clock signal? (Multiple Choice)
OTM nr.m consists of a maximum of "n" optical multiplexing channels and does not support non-channel-associated overheads. The letter "r" indicates function reduction.
RSOH, MSOH, HPOH, and LPOH implement monitoring functions in the descending order of monitoring scope.
In the system control unit, which of the following databases do not lose data after a power failure?
SDH signals must be scrambled before being transmitted over optical fibers. Which of the following bytes are not scrambled? (Multiple Choice)
Which of the following statements about the optical-layer interfaces OTM-n.m and OTM-nr.m of OTN is incorrect?
EPL services exclusively use ports and bandwidths, and different users may need to share resources. Which of the following methods can be used to isolate user data?
Which of the following effects is used by the Raman amplifier?
Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?