2. SCbus Routing of Resources

SCbus Routing Overview

SCbus routing concepts for connecting resources via the SCbus are presented in this chapter. SCbus routing functions provide the flexibility to connect together any two devices attached to the SCbus and to allow any number of SCbus devices to listen to a single transmitting device. This flexibility enables:

• communications between voice devices and analog, digital network, or station interface devices;
• rerouting (switching) a voice device from one network interface device to another;
• moving (rerouting) shared resources, such as fax devices, from one network interface device to another;
• connecting together two network interface devices;
• connecting any number of incoming calls on analog or digital network interface devices to a single SCbus device;
• connecting a station interface device to a voice device, analog, or digital interface device.

Conceptually, think of all SCbus time slots as transmit time slots and that at system initialization, the transmit channel of each device connected to the SCbus is assigned to a unique and separate SCbus time slot. Then routing is merely connecting the receive (listen) channel of any SCbus device to the transmit channel of another SCbus device. In this manner, any number of devices can listen to the transmissions of another SCbus device.

The application can also disconnect (unlisten) the receive channel from the SCbus. When disconnected, no data is received by the device from the SCbus.

Two types of SCbus routing functions are provided:

• network/resource (nr_) SCbus convenience functions and
• individual SCbus routing functions.

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