GAI-Tronics ITR1000A User And Installation Manual - page 17
ITR1000A Basic Tone Remote Desk Set
Installation
13
01/05
Line Considerations - Private Circuit
If leased lines from your local telephone company are used between the desk sets and the ITA2000 or
similar tone remote adapter, the telephone company (Local Exchange Carrier) may request a Facility
Interface Code (FIC). The FIC is subject is to local availability.
Analog Facility Interface Code
FIC
Description
02NO2
2-wire private line; no signaling conversion by LEC (IN-Band)
Within a manufacturing plant, a campus, or large building, customer-supplied metallic pairs may be used.
It is not necessary to have dc continuity on these lines.
Circuit Conditioning
The desk set is designed to work with good-quality analog speech band or leased private circuit. This was
previously known as ‘basic’ conditioning under Series 2000/3002 service. The line must be non-PSTN
(no dial tone, talk-battery, or signaling).
This equipment falls under the Category II, FCC Tariff #260 Service and is exempt from FCC Part 68
registration. (Ref. FCC Form 730 Application Guide pages 1–5.)
For 2-wire operation, 2000 Series lines may be used with or without conditioning. C1 or C2 conditioning
is available for these lines and relates to the envelope delay distortion and attenuation. A basic
conditioned line may be used if it is the only type available. Overall system quality is limited by the
quality of these lines.
Settings and Adjustments
The desk set housing must be open with the circuit board exposed. These procedures assume that the
base station has been properly adjusted.
Line (Receive Audio) Input Level Adjustment
This ensures that the tone remote desk set compression amplifier circuitry operates properly on signals
from the base station.
1.
Adjust the base station level by applying an RF signal modulated with a 1000 Hz tone at rated system
deviation to the base station receiver.
2.
Adjust the base station output control for the desired level (e.g. -10 dBm) to the audio control line.
Do not exceed the line supplier's recommended maximum operating level.
Remote Adjustment:
1.
Connect an ac voltmeter to TPC1 on the main circuit board.
2.
Starting with the line input control (pot 3) rotated fully clockwise, adjust the line input control until
the ac voltage level across the meter just stops increasing at approximately -2 dBm.
3.
Remove the RF signal from the base station.