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多项选择题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.

  • A,B,C
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