GAI-Tronics IPE2500A, IPE2500A-MLS Paging Encoder / Desktop Controller User and Installatoin Manual - Manual (Page 22)

Operation IPE2500A and IPE2500A-MLS Paging Encoder/Desktop Controller
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Parallel Status Operation
The IPE2500A supports parallel status updating. This feature allows all dispatch positions to know the
status of the base station.
To decode this information, the unit senses high level guard tone (HLGT), then decodes the function tone
that follows. Due to various tone control schemes supported by the unit, it is important to understand the
rules of decoding the function tones.
1. If the monitor function is decoded, the unit is placed into the monitor mode. If any transmit function
tone is programmed to be the same as the monitor function tone, that transmit tone will not be
decoded.
2. If two transmit function tones are programmed to the same frequency, only the first of the tones in
the sequence will be decoded; the subsequent transmit function tones set to the same frequency will
not be decoded.
3. If a PTT function tone is programmed, it is not decoded since this does not contain channel control
information. If a transmit function tone is programmed to be the same as the PTT function tone, the
transmit function tone will not be decoded.
4. If a transmit function tone is programmed to be the same as a tone supervisor tone, the supervisor
function will be decoded.
To illustrate, the priorities of the decode function are as follows:
Highest priority: Monitor Function Tone
Supervisor On Function Tone
Supervisor Off Function Tone
PTT Function Tone
Lowest priority: Transmit Function Tone (F1 to F15, F16 with Monitor disabled)
N OTE : Parallel status update operation is not available with the IPE2500-MLS.
Frequency Display
When shipped from the factory, the LCD display shows
FREQ: XX
, with XX being 1 to 16, depending on
the selected frequency.
Each time the IPE2500A is powered up, the status of the base/radio is unknown. The desk set LCD
display flashes the last selected frequency when the unit was powered down. The display continues
flashing until a transmission or frequency change is entered, or a parallel unit initiates a transmission or
frequency change. Each time a guard tone is detected on the line, the desk set assumes the status of the
base/radio is unknown until a function tone is decoded at the proper time.
Note that the display remains flashing even when a monitor command is initiated after power-up. This is
because the monitor command does not control which frequency is being monitored and the state of the
base/radio is still unknown.
Since the IPE2500A-MLS does not support parallel status updating, the displayed frequency or alias is
never flashed. The operator must ensure that the base station is on the proper frequency.