To do successful work on their service learning project, students need to learn skills and concepts, the learning goals of your class. You need to decide how to teach these skills and concepts. Traditional methods can work well. The community partner needs to provide a one-page problem statement on letterhead.
ISDN physical layer (Layer 1) frame formats differ depending on whether the frame is outbound (from terminal to network) or inbound (from network to terminal). Both physical layer interfaces are shown in Figure: ISDN Physical Layer Frame Formats Differ Depending on Their Direction.
ISDN PRI is often referred to as 23 B + D (in North America and Japan) or 30 B + D (in the rest of the world). The D channel notifies the central office switch to send the incoming call to particular time slots on the Cisco access server or router. Each one of the B channels carries data or voice.