单项选择题
What is the purpose of Dual Ring Interconnect with D C for SDH rings？（）
A.Protects signals when a ring switch fails
B.Protects signals when multiple span switches fail
C.Protects pre-emptible traffic from being dropped when a ring switch occurs
D.Protects signals against any combination of link failure in each ring
相关考题
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单项选择题
WhatistheeffectofturningonallavailabledownstreamcarriertonesinaDMTDSLtransmissionsystems？（）
A.Downstream RS error correction effectiveness is reduced
B.The downstream line rate and throughput remains unchanged， but FEC efficiency is reduced
C.The upstream DSL bandwidth is reduced， since less carriers become available for upstream traffic
D.The downstream DSL bandwidth is increased -
单项选择题
WhichstatementisFALSEconcerningtheinterleavedepthvalue？（）
A.A higher interleave depth provides more protection from burst of noise on the HFC network
B.Higher interleave depth increase downstream latency
C.Lower interleave depth cause some packet loss on typical HFC networks
D.None ofthe above -
多项选择题
WhichtwoIOScommandsareequivalentsforputtingaCisco7500OC-12RPRinterfacecardintowrappedmode？（）
A.shutdown [a b]
B.srp shutdown [a b]
C.srp ips request manual-switched [a b]
