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Chapter 1
Introduction
The Cubix Line Busy Module is designed to be placed between a Cubix communications processor and an attached modem. Its purpose is to make the telephone line appear busy when the processor or modem is not ready to answer an incoming telephone call.
The Line Busy Module is inserted in series with the RS232 line from the processor to the modem and in series with the telephone line from the PBX to the modem. The Federal Communications Commission (FCC) has registered this module only for use on PBX systems and not for direct connection to the Public Telephone Network.
The Line Busy Module is designed to be used on rotary PBX systems to keep incoming calls from ringing a line that will not answer. The Module uses Data Terminal Ready (DTR) from the Cubix processor's communication port to determine whether or not the processor is ready for a call. If DTR is false, the Module creates an offhook condition on the telephone line to force the rotary PBX to bypass this extension for an incoming call. When DTR is asserted true, the Line Busy Module will terminate the offhook condition and the processor will respond to an incoming call.
Cubix processors assert DTR false on a reset operation. It is the responsibility of the communications application running on the processor to assert the DTR signal true.
This document, and all Web contents, Copyright © 1997
by Cubix Corp., Carson City, NV, USA.
