Paradise Datacom P300 Series Installation & Operating Handbook page 112

The modem and BUC are both manually controlled from the modem front panel
(the modem as normal, and the BUC with
operator maintains control of the BUC Tx on/off status, and any BUC attenuator
available. The modem does however automatically report the IF frequency to
the BUC so the BUC may select the correct power calibration table for the
monitored power reported back to the modem, viewable under
It is advisable to keep the BUC attenuator at maximum attenuation to avoid
overdriving the BUC input stages, unless there is considerable cross site cable
loss. Fine (0.1dB power control is done with the modem (
desired carrier power cannot be achieved with maximum BUC attenuation, then
there must be considerable cross site loss and so it is safe to reduce the BUC
attenuation. It is advisable to keep the modem carrier power several dB away
from either the upper or lower modem power end stop, to provide future fine
adjustment range.
Initial power adjustments must be made `off satellite`. The measured BUC
power can be viewed using
The Modem takes control of the BUC to act as an integrated terminal, and the
two together respond as follows:
Terminal mode can only be used with a single carrier through the BUC, as the
modem will try and compensate for the combined measured power by adjusting
the single carrier from the modem controlling the BUC.
Terminal mode, where the Tx power is varied to maintain a steady level at the
BUC flange, is NOT compatible with AUPC which requires the Tx power to vary
to meet receive criteria.
P300H P300 Series Modem Installation and Operating Handbook
), whereas the BUC attenuator provides 1dB adjustment steps. If the
The modem IF output level screens are replaced by a screen allowing the
operator to set the output power at the BUC flange.
The Modem continuously reads the monitored power output from the BUC,
and automatically varies the modem IF level and BUC attenuator to maintain
the set power at the BUC flange (ie compensates for temperature changes
in cable, equipment etc).
The BUC Tx On/Off output is maintained as `On` (the Tx carrier can still be
muted on Change, Tx, Modulator, Carrier menu).
The modem automatically reads the frequency shift from the BUC, and
configures the modem for display / entry of the final SHF frequencies
instead of IF frequencies.
,
, .
, ). The
, .
, , ,
Page 112