GAI-Tronics ITA2000A ITA2000A Series Tone Remote Adapter with Scanning User and Installation Manual - Manual (Page 13)

ITA2000A Series Tone Remote Adapter Operation
9 03/13
The rear view of the ITA2000A shows the line, accessory, radio, and power connector locations. Also
shown are the
TX
and
RX
level adjustment pots, and the location of the internal fuse.
Tone Control Interface
The ITA2000A decodes standard EIA tone keying control tones for controlling the radio system. The
control tone convention can be seen below.
The function tone frequency ranges from 550 Hz to 2050 Hz in 100 Hz increments. 2050 Hz represents
monitor in Conventional mode and scan start/stop in Scan mode, 1950 Hz for F1, 1850 Hz for F2 down
to 550 Hz for F15.
When scanning and carrier is detected, a similar tone sequence is generated to the phone line where
HLGT is generated for 40 ms followed by a 20 ms function tone representative of the current channel.
This tone sequence will be decoded by desk sets capable of fast parallel status update, such as the GAI-
Tronics ITR2000A and IPE2500A. The use of products that are not capable of decoding this fast tone
sequence is not advisable, as the reliability of the operator information may be less than desirable.
TX
RADIO ACCESSORY
LINE
13.8VDC
0.3A
INTERNAL
RX
LEVEL
FUSE
DC POWER
Rear View of the ITA2000A
Standard EIA Tone Control Sequence