Comtech EF Data CDM-550T, Manual

Page: 35 / 178

CDM-550T Satellite Modem Front Panel Operation
Rev. 1.3 6–5
6.2.3 Config:
The sub-branches available are:
ALL This menu sub-branch permits the user to completely configure the
unit, being prompted, step by step, to make choices, or edit data. This
is highly recommended for new users, as it will clearly demonstrate
all the parameters which need to be set.
TX (Transmit) This menu sub-branch permits the user to define, on a
parameter-by-parameter basis, the transmit configuration of the unit.
These menu sub-branches would be used if the user wished to
change, for example, just the Transmit frequency.
RX
(Receive) This menu sub-branch permits the user to define, on a
parameter-by-parameter basis, the receive configuration of the unit.
These menu sub-branches would be used if the user wished to
change, for example, just the receive data rate.
FRAME This menu sub-branch permits the user to define if the unit should
operate in a transparent mode (no framing) or in a framed mode. In
the framed mode, an overhead of 5% is added to the rate transmitted
over the satellite so that M&C information may be passed to the
distant end.
INTFC
(Interface) This menu sub-branch permits the user to define which
electrical interface type is active at the data connector.
REMCONT
(Remote Control) This menu sub-branch permits the user to define
whether the unit is being controlled locally, or remotely.
IMPORTANT NOTE: The unit may be monitored over the remote
control bus at any time. When in Local mode, however, configuration
parameters may only be changed through the front panel. Conversely,
when in Remote mode, the unit may be monitored from the front
panel, but configuration parameters may only be changed via the
remote control bus.
MASK
This menu sub-branch permits the user to mask certain traffic alarms,
which may cause problems to the user. As an example, certain
multiplexers use ‘all ones’ as an idle pattern. However, by
convention, the ‘all ones’ condition is taken to be the Alarm
Indication Signal (AIS). The CDM-550T monitors for the AIS
condition, and if desired, this alarm may be masked.
IMPED (Impedance) This menu sub-branch permits the user to define the
impedance at the IF connectors, either 50 or 75 ohms.
Each of these options is now described in detail.
CONFIG: ALL TX RX FRAME
INTFC REMCONT MASK IMPED