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

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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

單項選擇題

What protocol does an IP phone use to learn the voice VLAN ID it should use for voice traffic？（）

A.VTP
B.802.1 q
C.CDP
D.Skinny Station Protocol

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What is the function of the AJB bits on DS1 using Extended Super Frame （ESF）？（）

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During the modem boot process，how does the modem acquire the downstream channel？（）

What protocol does an IP phone use to learn the voice VLAN ID it should use for voice traffic？（）

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During the modem boot process，how does the modem acquire the downstream channel？（）