Instruction manual

ACU-1000 Operations Manual
3-6 Interoperability Now
3.4.3.5 Headphones Output Jack (HSP-2A)
This stereo jack accepts a stereo or mono 3.5-mm (called 1/8") headphone jack. The monaural
headphone audio signal is supplied to both sections of a stereo jack. Headphone volume, along
with the volume of the speaker and handset earpiece, is controlled by the front panel volume
potentiometer.
3.4.3.6 Volume Control (HSP-2A)
This potentiometer adjusts the volume to the speaker, handset, and headphones.
3.4.3.7 Fault LEDs (HSP-2A, DSP-2, RDI-1, PSTN-2, LP-2)
The red FAULT LEDs will be illuminated whenever the associated module's built-in-test
circuitry detects a fault condition for that module.
3.4.3.8 Master/Expansion LEDs (CPM-4)
The Master and Expansion LEDs are illuminated only when a pair of ACU-1000’s are daisy-
chained together to create an Expanded System. These LEDs indicate the status of each unit in
the configuration. The Master chassis contains modules corresponding to extensions 0 through
12, and the Expansion chassis houses extensions 13 through 25.
3.4.3.9 Mon (Monitor) LED (RDI-1, DSP-2, PSTN21, LP-2)
The Monitor LED of any module is lit whenever that module is being monitored by another
module.
3.4.3.10 Signal LED (RDI-1, DSP-2)
The signal LED gives an indication of the proper audio level entering the module from the
outside world. This LED lights when the audio level is correct for the module. The input audio
level should be adjusted so the signal LED just flashes on voice peaks. If the LED never lights,
the audio level is too low; if the LED stays lit nearly continuously, the audio level is too high
for best system operation. See Section 2 for installation and setup instructions.
3.4.3.11 PTT LED (RDI-1, DSP-2), VOX LED (PSTN-2, LP-2)
The PTT or VOX LED lights whenever the associated module’s VOX or squelch has been
activated and the module is causing an associated transmitter to transmit.
3.4.3.12 COR LED (RDI-1, DSP-2)
The green LED provides an indication showing squelch has been broken on the associated
input audio channel. This indication will depend on the method of COR in use. In systems
which use external COR inputs this occurs when the receiver is Unsquelched, driving the
receiver’s COR output low. In the DSP-2 module, when squelched receivers are used and no
external COR line is available, signal is declared present (squelch broken) when VMR or VOX
is activated, depending on which one of these is enabled.