Instruction manual

ACU-1000 Operations Manual
Interoperability Now 5-9
5.8 PSTN-2 Module
5.8.1 General Description PSTN-2
The PSTN Module is the 2-wire interface between the ACU system and a telephone system (as
opposed to a telephone set). A telephone system is an entity that accepts dialing information
and processes calls, such as a PSTN line, PABX line, Inmarsat Terminal, or cellular phone. (A
telephone set is a device that generates
The module has a DSP hybrid and VOX with programmable sensitivity and hangtime. It has a
DTMF receiver/generator for control and call progress recognition. There are two uncommitted
auxiliary parallel inputs and two uncommitted auxiliary parallel outputs.
dialing information. It is interfaced to the ACU system
via the LP-2 Module.) The PSTN-2 contains one 2-wire jack with front-panel RJ-11C jack for
interfacing with PSTN lines or satellite equipment. The module contains ring detect circuitry.
The interface signal levels are programmable via the HSP-2A module or via the ACU
Controller or WAIS Controller.