ZETRON 025-9581M, Installation And Maintenance Manual

Page: 99 / 196

99
Audio Support with Optional VoIP Intercom
This would include foot switches and headset/handset PTT switches that are part of the
dispatch console system.
The connection between the console channel card and the FSA/VoIP Gateway server PC is
accomplished using the Zetron Audio and Digital Input Interface (950-0690). The
connections made are shown in
Figure 36 . The pinout for the cable connecting to the
console channel card are given in Table 2 .
♦
Installing the Audio and Digital Input Interface Unit
1. Locate the FSA/VoIP server machine in the equipment room so that it is
conveniently close to the equipment rack that holds the dispatch console channel
card assigned to handle the audio for the FSA system.
2. Make up the necessary cable to connect the channel card to the Digital Input 1 jack
on the Audio and Digital Input Interface box (950-0690). The pinout for the end
with the RJ-11 modular connector is shown in
Table 2 . The leads on the other end
will need to match the connections on the channel card.
3. Make the connections between the channel card and the interface box.
4. Make the connections between the interface box and the server PC.
Note The Audio and Digital Input Interface is also used for systems that
employ radio to carry the voice audio. In these systems the
interface does not handle the voice audio signal, but it is still
required to provide an input for the PTT signal into the FSA Server.
Note The USB-to-Serial Bridge unit must be installed on the server
machine prior to installing the Audio/Digital Interface Unit. The
USB-to-Serial Bridge must be used even if the computer has a
serial port. See
Installing the USB-to-Serial Bridge
on page
101.
Note The PTT signal supplied to the FSA Server interface box must be a
dry contact closure. An open-collector circuit or some other
“electrical” signal is not usable.