The reason data traveling across a T1 channel is normally 56

The reason data traveling across a T1 channel is normally 56Kbps is: A. portion of a T1 channel is used for in-band signaling for voice communications 56Kbps is the highest theoretical rate for data communications across a T1 T1 only transmit information at 56Kbps rates It is the most efficient means of using the T1 channel

Solution

Correct option is b in this case ie,

56 Kbps is highest theoretical rate for data communications across aT1.

\"56k\" has become almost synonymous with dialup Internet access. It is  chosen as the fastest dialup speed.