User's Manual Part 6
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The following table described the signals used for line interface on P13 and P14.
Pin
No.
Signal Description
P13-1 DET-AF-OUT Output, buffered and low pass filtered, for flat response (60% devia-
tion, 0.25Vp-p, 1kHz).
P13-3 RX-LINE-OUT De-emphasised and high pass filtered output (60% deviation,
0.4Vp-p, 1kHz). High pass filter circuit depends on presence of
sub-audible tone signalling. Used for de-emphasised response.
P13-6 TX-LINE-IN Input to pre-emphasis stage, bypasses compressor. Used for the
pre-emphasised response (60% deviation, 0.3Vp-p, 1kHz). Line
input will override microphone signal if both are present.
P13-8 TX-SIG-IN Low gain input to T2000 limiter stage. Bypasses pre-emphasis and
high pass filtering, used for the flat response (60% deviation,
2.2Vp-p, 1kHz).
P13-11 OPT-GND Earth from the regulator section of the T2000 main PCB. Used to
avoid earth loop noise.
P13-12 +13.8V-UNSW Unswitched +13.8V supply from the T2000. Powers audio PA and
external opto key circuits.
P14-1 +13.8V Switched +13.8V supply from T2000. Powers line interface PCB +8V
regulator.
P14-2 +5.0V +5V from T2000 main PCB regulator. Powers hex invertor ICs and
trunking switches.
P14-3 BUSY Output BUSY = 0V is used to inhibit line input derived key and line
input mutes. On trunked versions is used for inhibit logic.
P14-4 RX-GATE Output port used to open the mute element in the T2000. Used to
control line output mute.
Note:
Unmute = +5V for T2010 and T2020;
Unmute = 0V for T2030 and T2040.
This also drives the line key and opto driver indirectly.
P14-5 PTT-TO-OPT Output mirrors PTT from microphone or signalling. PTT = 0V. On
trunked versions is used for inhibit logic.
P14-6 PTT-FROM-OPT Input port to key transmitter. Used for line input derived key and
microphone derived key.
P14-7 IN-LOCK Synthesiser phase lock detector output. Used for modem control
applications. Lock = 0V.
P14-8 MIC-MUTE Input port used to disable local microphone signal on line input
derived PTT (not on microphone PTT). Mute = +5V.
P14-13 AUX Auxiliary control output configurable in software. Used to enable/
disable crossband linking, 2 wire linking etc. (see trunked versions).
Aux on = +5V.
Trunking Models: Additional Functions
P14-5 PTT-TP-OPT For inhibiting modem output on PTT from microphone.
P14-10 EMERG Performs a new function. ‘External call request’ = 0V input. Used
for modem calls on a trunked system.
P14-11 CALL-SW Performs a new function. ‘Traffic channel allocated’ = +5V output.
Used for modem calls on trunked system.
P14-13 FCN/BELL/AUX Performs a new function. ‘Not clear to send’ = +5V output. Used for
modem calls on trunked system.