单项选择题
What is the function of the AJB bits on DS1 using Extended Super Frame （ESF）？（）
A.It is used for signaling on-hook and off-hook status
B.It carries CRC information for error detection
C.It is used for a control and performance information
D.It is used for a frame’s synchronization and alignment
相关考题
-
单项选择题
Duringthemodembootprocess，howdoesthemodemacquirethedownstreamchannel？（）
A.The modem is commanded by the CMTS to set to the specific channel
B.The modem uses the default value in the broadcom chipset
C.The modem tuner sets a level as defined by the DOCSIS specification
D.The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered -
单项选择题
WhatprotocoldoesanIPphoneusetolearnthevoiceVLANIDitshoulduseforvoicetraffic？（）
A.VTP
B.802.1 q
C.CDP
D.Skinny Station Protocol -
单项选择题
WhatistheeffectofchangingDMTinterleaveddelayfrom3millisecondsto15milliseconds？（）
A.Latency remains the same， but throughput is decreased.
B.Latency remains the same， but error correction effectives may also be reduced.
C.Latency is increased， but faster error correction occurs.
D.Fewer ATM PVCs can be provisioned on DSL line.
