| PRI This
ISDN service is used mainly by Internet service providers (ISPs) and
businesses. Why? Because it provides a lot of bandwidth: 23 B channels
with 64-kbps throughput capability and one 64-kbps D channel for call
signaling and setup. It was designed for transmission through a standard
North American T1 trunk and has throughput capability to 1.472 mbps. If
you see the notation 23B+D, that's another way of saying the same thing. |