1. Introduction to SCbus Functions

SCbus Overview

This guide describes the SCbus routing functions. These functions provide the ability to establish communications between Dialogic devices. An explanation of an SCbus Windows demo program is also provided in this guide. For information on SCbus routing, refer to the SCbus Routing Guide.

NOTE:

The SCbus routing functions only support SCbus hardware configurations.

The SCbus is a real-time, high-speed, time division multiplexed (TDM) communications bus that provides 1024 time slots for transmission of digital information between SCbus products. The SCbus allows high-density systems to efficiently share resources so that multiple technologies can be connected to each port as needed.

Each SCbus product consists of several devices. Each of these devices can communicate via the SCbus with any other device connected to the SCbus. For example:

• a D/41ESC board provides 4 on-board analog loop start interface devices and 4 voice devices, for a total of 8 devices communicating over the SCbus.
• a D/160SC-LS board provides 16 on-board analog loop start interface devices and 16 voice devices, for a total of 32 devices communicating over the SCbus.
• a D/240SC-T1 board provides a T-1/DSX-1 interface for processing 24 T-1 time slots/calls and 24 voice devices, for a total of 48 devices communicating over the SCbus.
• a D/300SC-E1 board provides an E-1 interface for processing 30 E-1 time slots/calls and 30 voice devices, for a total of 60 devices communicating over the SCbus.
• a VFX/40ESC board provides 4 on-board analog loop start interface devices and 4 FAX/voice devices, for a total of 8 devices communicating over the SCbus.
• a MSI/240SC board provides 24 on board station devices, for a total of 24 devices communicating over the SCbus.

All devices connected to the SCbus have a transmit (TX) channel and a receive (RX)(listen) channel. At system initialization, each transmit channel is assigned to a specific and unique SCbus time slot. This transmit channel assignment cannot be changed by the application.

Since all transmit channels are pre-assigned, routing an SCbus device only requires connecting the receive (listen) channel of the device to an SCbus time slot. The connected device then listens to all data transmitted over that SCbus time slot. This receive channel can be moved (disconnected and connected) to a different SCbus time slot at any time by the application.

NOTE:

The SCbus routing functions only support SCbus configurations.

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