Dispersion compensation is not required for 40Gbit/s and 100 Gbit/s coherent systems because the dispersion tolerance of coherent boards is large. NG WDM products do not support hybrid transmission of non-coherent and coherent networks.

A. True

B. False

ESC can also be used at OLA sites.

A. True B. False

The maximum output optical power of an OBU board is 20 dBm, when it is used in a C-band 80-channel system, what is the standard per-channel output optical power?

A. +1dBm

B. -2dBm

C. +7dbm

D. +4dBm

Which of the following alarms trigger optical line protection switching?

A. POWER_DIFF_OVER

B. R_LOF

C. MUT_LOS

D. R_LOS

Which of the following OTN trails does not need to be manually configured on an ROADM site, and can search out directly?

A. OSC

B. OCh

C. OMS

D. OTS

A and C are WDM OTM sites, and B is a regeneration site. If the ODU2_LCK signal is inserted at site A, which of the following statements are correct?

A. Site C reports a ODU2_PM_LCK minor alarm.

B. Site A reports a ODU2_PM_BDI minor alarm.

C. Site A reports a ODU2_PM_LCK minor alarm.

D. Site C reports a ODU2_PM_BDI minor alarm.

Which of the following signals can be used as input or output signals of an external clock interface?

A. 2.048 MHz

B. 2.048 Mbit/s

C. 155 Mbit/s

D. 34 Mbit/s

FXS and FXO are the names of the ports used by analog telephone lines. FXO ports and FXS ports are always used in pairs.

A. True

B. False

Which of the following statements about avoiding the generation of discrete trails are correct?

A. Use the trail function for configuration.

B. For services configured on a per-NE basis, search for trails on the NMS to ensure that the service configurations are complete and standard.

C. A fiber cut or switching test must be performed on the trail with protection routes to ensure that the configuration is complete and standard.

D. Guide users to learn service configuration specifications.

Which of the following is not included in an ASON network?

A. ASON Domain

B. ASON NE

C. SC

D. TE Link