A2
Glossary Of Terms
M805-00
30/09/96
Copyright TEL
CTCSS
Continuous Tone Controlled Squelch System. A sig-
nalling method used to key selected receivers oper-
ating on the same RF frequency. Typically operated
in the 67- 250.3Hz frequency range.
CYFAS
A company in England specialising in line signal-
ling. Their line barrier units are often used with the
AIM and ARM cards.
GPS
A term used to describe the timing pulse generated
by the TSGM during training.
Group
A combination of 32 TSGM(s) and LEM(s) commu-
nicating with the System Controller via a port on the
ACL-II card.
Group Delay
The frequency dependent time delay applied to a
signal being passed through a system of a given
transfer characteristic.
HF Training Audio
The audio signals used for training/equalising the
LEMs, occupying the 300-2850Hz band.
ICCS
A term used to describe a proprietary digital cross-
over switch which is used to transmit audio over a
digital link.
Inversion Mode
The most common operating mode of an AIM when
in use. The audio passed into it is mixed around a
carrier and thus baseband shifted. This mode is
used so that signals in the 67-300Hz frequency range
may be passed down a land line (which has a very
poor frequency response below 300Hz).
Land Line
A means of linking communications between two
physically separated sites using a Telecom link.
LEM
Line Equaliser Module (T805-02). The module that
performs the audio equalisation required to operate
a transmitter in the Tait Quasi-Synchronous system.
LF Training Audio
The audio signals used for training/equalising the
LEMs, occupying the 45-300Hz band.
Line Reversals
Reversals of line polarity resulting in a 180
°
phase
shift of the audio signal.
Master Controller
The controller of the controlling system, typically
connected to the PC Controller, with some control
signals connected to the TSGM. When an AIM/
ARM combination is used, it must also be capable of
generating a 2970Hz tone down the speech audio
path to signal the ARMs to key their transmitters.
Summary of Contents for T805
Page 16: ...4 2 ASP Card Operation M805 00 30 04 95 Copyright TEL ...
Page 44: ...7 18 Initial Programming Adjustment M805 00 30 09 96 Copyright TEL ...
Page 70: ...14 1 2 PCB Information M805 00 30 04 95 Copyright TEL ...
Page 89: ...Copyright TEL 30 09 96 M805 00 T805 Front Panel PCB Information 14 5 3 ...