單項選擇題How many content definitions does CSG allow？（）

A.40
B.400
C.4000
D.40000


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1.單項選擇題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

2.單項選擇題During the modem boot process，how does the modem acquire the downstream channel？（）

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

4.單項選擇題What is the effect of changing DMT interleaved delay from 3 milliseconds to 15 milliseconds？（）

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.

5.單項選擇題When gateways are registering with a gatekeeper， the gatekeeper can be（）.

A.On the same subnet
B.On a remote LAN
C.In a different subnet
D.Any of the above

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