Description ITR2000A Tone Remote Desk Set
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Audio Accessory/RS-232 Port (P411)
The ITR2000A contains an eight-pin modular desk mic port to provide audio accessory options. Possible
accessories include desk mic, gooseneck mic, boom mic, headset, or footswitch. The port is also used as
the connector to a PC for CARD Suite programming.
Table 2.
Mic Input Pin Function
Type: Passive input 1 B+ OUT (through 10 ohm)
Input Impedance: >2k ohm 2 RS-232 TX OUT
Nominal Input Level: −20 dBm 3 Monitor IN (closure to ground)
Input Adjustment Range: N/A 4 AGND
5 Mic IN (with bias voltage)
6 PTT IN (closure to ground)
7 RS-232 RX IN
8 RX audio OUT (handset audio)
Line Connector (P401)
The modular six-pin line connector is located on the rear of the desk set. See rear view diagram above.
The line connector pinout and diagram are shown below:
Figure 4.
Pin Function
1
2 Four-wire RX +IN
3 Two-wire TX +OUT/RX IN
4 Two-wire TX –OUT/RX IN
5 Four-wire RX –IN
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Control Tones
Standard EIA tone keying tones are used for controlling the radio system. The sequence is:
A 2175 Hz High Level Guard Tone (HLGT) for 120 ms.
One of 16 function tones (FT) is sent for 40 ms.
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