H31-311 試験問題を無料オンラインアクセス

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.New types of optical fibers are not used.
• B.EDFAs are used.
• C.Multiplexers and demultiplexers are used.
• D.Fiber attenuation is excessively high.

When the SXCS board is configured for an OSN 3500, which of the following is the access capacity of the subrack in full configuration?

• A.80G
• B.35G
• C.58.75G
• D.155G

When multiple users need to share the same VCTRUNK and use the same VLAN ID, the QinQ technology can be used.

• A.TRUE
• B.FALSE

When an optical fiber between node A and node B is broken, the FIU on node B detects the OTS_LOS alarm and inserts the OTS_BDI alarm to node A.
The FIU on node A reports the OTS_BDI alarm. The line board on the downstream C node reports the OCh_SSF alarm.

• A.TRUE
• B.FALSE

In the case of SNCP, a line board selectively receives services. Therefore, the SNCP can protect the services on the line.

• A.TRUE
• B.FALSE