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500-19-54 Dual Channel Telephone Interface
Page 8 of 19
Issue 1.2
Trilogy Communications Limited
2.2 General
The unit contains one dual hybrid card 500-19-21 which can be used as either a means of
converting 2 telephone lines to a line level 4 wire circuit or, if installed with one or two TICs
(Telephone Interface Card 500-19-00 for Commander and 700-19-00 for Mercury), allow a full
DTMF telephone integration with the Trilogy system. For information on the software integration
of the frame into a system refer to the Pathfinder User Guide (chapter 17) or the Mercury
Configuration Manual.
The following diagram shows a typical installation.
The Dual Hybrid module plugs into the second card slot of the frame, the first and third slots are
for channel one and channel two Telephone Interface cards (TIC) respectively.
Each channel of the digital Dual Hybrid has identical features. The line interface has jumper
selectable CTR21 or 600 ohms that allows the hybrid to operate in the majority of countries.
Also provided on the card is a DIL header to allow the addition of a balance network when
required. This is normally done after consulting Trilogy Support.
The provision of the optional parallel handset connection when auto is set to off this allows for
manually setting up and answering calls when used in conjunction with the manual seize and
drop controls on the Hybrids front panel. If the front panel switch is selected to Auto the parallel
handset will be disconnected.
Trilogy Matrix
Dual Hybrid Channel 1
Telephone Line Telephone Line
Dual Hybrid Channel 2
Handset
(optional)
Handset
(optional)
Audio Audio DataData
TIC (optional) TIC (optional)
Port “A” Port “B”