问题:
A . Each ISDN B channel has transmission speeds of up to 64 kbps.
B . The ISDN B channel can carry video, voice or data.
C . The ISDN B channel transmission rate varies depending on the service used.
D . The ISDN D channel transmits control information.
E . The ISDN B channels can be configured with different subnets and encapsulation types when dialer profiles are configured.
● 参考解析
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