GAI-Tronics IDA1000A DC Remote Adapter Installation and Service Manual - Manual (Page 11)

7 01/05
Operation
Operational Description
The Model IDA1000A DC Remote Adapter is for use with base stations or repeaters controlled from a
remote desk set or console by dc line currents. One adapter can interface up to ten dc remote desk sets to
the base station or repeater, depending on the system design.
The Model IDA1000A incorporates all necessary circuit interfacing to translate single-frequency
(5.5 mA) transmit and monitor (-2.5 mA) commands into signals to control base station operation. Where
applicable, F2 transmit (12.5 mA) commands are also supported when used with a two-frequency base
station. Frequency outputs are jumper-selectable for open collector, 5 V pull up, or pull down. The
Model IDA1000A can be programmed to revert to F1 or F2 receive after transmit. See the SW1 Switch
Settings Table on page 14.
Monitor operation can be either latching or non-latching. The adapter routes audio signals between the
wire line and base station circuitry. Transmit audio from the wire line is amplified before being input to
the station. Receiver audio from the base station is amplified before being output to the wire line.
The amount of gain set by the adapter will operate full duplex with either 2-wire or 4-wire. The balanced
inputs cancel ac line noise.
Five LED function indicators are included on the front panel. When illuminated, they indicate wire line
push-to-talk command, a monitor command, and presence of 5 V dc power. Two LEDs indicate detection
of line current levels of 5.5 mA (
F1 ) or 12.5 mA ( F2 ).