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Functional Description
The Acknowledgment has a duration of 140 ms with a nominal level of -4 dB. Depending on the
settings entered via the RSS, the Acknowledgment may be sent immediately after the console
command has been received, or after a programmable delay period.
1.2.5
Audio TRC Command Acknowledgement
In addition to the TRC Acknowledgment described above, the TRICK may be programmed to send
an audio acknowledgment to the wireline in response to a received console command.
The audible tone confirms to the wireline console operator that the command has been received and
acted upon by the TRICK.
The audio tone has a frequency of 1823 Hz with a duration of 140 ms and a nominal level of -10dB.
The audio acknowledgment is sent 200ms after the console command is received.
1.2.6
Wireline Compensation
Parameters associated with the 2-wire or 4-wire line, which connects the TRICK with the control
console, may be adjusted to compensate for gain loss and frequency response. The following
options are available via the RSS
manual adjustment of the gain and the equaliser
manual adjustment of the equaliser, with automatic gain compensation
automatic compensation of both the gain and the equaliser
When a wireline console such as the Motorola Centro Plus is used it is essential that the wireline
parameters are set up correctly at both ends of the line. Incorrect configurations will cause 'falsing' of
the commands from the Centro Plus to the TRICK, and incorrect decoding of selective calling from
the TRICK to the Centro Plus.
Please refer to the Centro Plus Service Manual (ELN4580) for details of line compensation when
using Centro Plus.
The Centro Plus and TRICK have been designed to use a wire line based on the nominal level of all
values involved.
Note:
Certain earlier Motorola products were designed to use a wire line based on the peak
values involved.
The nominal value of a signal is defined as being 6dB below the peak value.
Manual Gain and Equaliser Compensation
The gain is adjustable in 1dB steps between 0dB and 20dB.
The equaliser can be set up to 0dB, 3 dB, 6dB, or 9dB extra gain at 3 kHz compared to 1 kHz.
Automatic Line Compensation
There are two methods of automatic line compensation, the approximation method and the
measuring method, which may be selected via the RSS.
1-10
Functional Description & Applications
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