Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?
A. SPI< >RST< >MST< >MSP< >MSA< >HFT
B. SPI< >RST< >MSA< >MSP< >MST< >HFT
C. SPI< >MST< >RST< >MSA< >MSP< >HFT
D. SPT< >MST< >MSA< >RST< >MSP< >HPT
When severely errored seconds (SESs) are present in the PM section at the ODUk layer, which of the following alarms is reported on the NMS?
A. ODUk_PM_ES
B. ODUk_PM_SES
C. ODUk_PM_SESR
D. ODUk _PM _UAS
An optical amplifier unit compensates for line loss and extends transmission distance. Connecting multiple optical amplifier units in cascading mode can infinitely extend transmission distance of a system.
A. TRUE
B. FALSE
The TAG attribute cannot be set for the internal port VCTRUNK of the board on the NMS.
A. TRUE
B. FALSE
The standard Ethernet frame length should not be less than 64 bytes. Which of the following factors cause this limitation? (Multiple Choice)
A. Minimum transmission distance
B. Maximum transmission distance
C. Working mechanism of conflict detection
D. MAC address
SDH signals must be scrambled before being transmitted over optical fibers. Which of the following bytes are not scrambled? (Multiple Choice)
A. A1
B. A2
C. J0
D. J1
When LMSP is configured, there are two switching modes: single-ended switching and dual-ended switching. The protection protocol does not need to be enabled for single-ended switching.
A. TRUE
B. FALSE
The backplane has two -48 V power supply cables, and each board obtains two -48 V power supplies from the backplane. After the power supplies are combined by diodes, various voltages required by each component are obtained through the DC/DC power module and linear conversion.
A. TRUE
B. FALSE
When the ACT indicator of an SDH board is off, it indicates that this board has a hardware fault and cannot be used,
A. TRUE
B. FALSE
Which of the following factors determines that the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent After signals are transmitted for a certain distance in a WDM system, the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent. Which of the following is the main cause?
A. EDFAs are used.
B. Multiplexers and demultiplexers are used.
C. New types of optical fibers are not used.
D. Fiber attenuation is excessively high.
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