When you configure a T1 CAS PSTN Interface, which command instructs the router to receive its interface clocking from the service provider?
A. inecode b8zs
B. clock source line
C. ds0-group 1 timeslots 1-24
D. clock source internal
When you configure a T1 CAS PSTN Interface, which command instructs the router to receive its interface clocking from the service provider?
A. inecode b8zs
B. clock source line
C. ds0-group 1 timeslots 1-24
D. clock source internal