多选题Which statements are true regarding ISDN channels?（）AEach B channel can transmit up to 64 kbpsBThe ISDN B channel carries voice or dataCThe ISDN D channel transmits control information.DThe D channel transmission rate varies depending on the service used.EHDLC or PPP can be used to encapsulate D channel information.
多选题
Which statements are true regarding ISDN channels?（）
A
Each B channel can transmit up to 64 kbps
B
The ISDN B channel carries voice or data
C
The ISDN D channel transmits control information.
D
The D channel transmission rate varies depending on the service used.
E
HDLC or PPP can be used to encapsulate D channel information.
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