Comtech EF Data SDM-650B Installation And Operation Manual page 294

Asynchronous Overhead Channel Unit
POW ADJ
OP MODE
FAST ACQ
FILTERS ADJUST
INT-TYPE RS-422, V.35
F–36
Modulator power adjust offset.
Allows the operator to offset the modulator output power
readout in the Config menu. This will be the highest modulator
power that will be displayed and programmed. This feature
does not actually change the modulator power level. The
function is to change the actual reading to display an offset
value in the monitor. The modulator power offset can be set
between +20.00 to -20 dB, in 0.5 dB increments.
Note: The maximum output power adjust, set in this window,
must match the maximum output power of the modulator
installed in the modem. In a switching system, the backup
modem must be set the same as the prime modem or a fault
will occur.
Operation mode.
Programs the modem operation for TX-only, RX-only, or
Duplex operation.
On entry, the flashing cursor is on the first character of the
display. Use the arrow keys to select TX-only, RX-only, or
Duplex. Press [ENTER] to execute the change. When TX-only
or RX-only is selected, the appropriate faults are masked from
the Faults and Stored Faults (StFaults) menu.
Fast Acquisition function.
Turns the fast acquisition and directed sweep function ON or
OFF.
When Fast Acquisition has been turned OFF, the Swp_Cntr,
SWP_Rnge, and SWP_DIR windows in the Config menu are
disabled and do not appear. Also, in the Monitor menu,
Swp_Freq will not appear. When turned OFF, Fast Acquisition
does not occur.
Note: Fast acquisition only applies to data rates of 256 kbit/s
and below. If the sweep range is set to less than 50 kHz,
acquisition will be dictated by the directed sweep
specifications. The fast acquisition algorithm will not be used.
This is a factory setting, and the operator is not allowed to
enter this parameter without authorization from the EFData
Customer Support Department. Failure to comply will result in
a modem failure.
SDM-650B Satellite Modem
Rev. 5