Comtech EF Data CDM-500 - Manual (Page 34)

CDM-500 Closed Network Satellite Modem Front Panel Operation
Rev. 1.3 6–5
6.5 CONFIG:
CONFIG: ALL TX RX FRAME
INTFC REMCONT MASK IMPED
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 via may only be changed 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-500 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.
6.5.1 (CONFIG) TX (Transmit)
TX: MOD FREQ DATA FEC
ON/OFF PWR SCRAM CLK TSI
The sub-branches available are: