CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–9
5.6.1 CONFIG
The sub-branches available are:
Remote
(Remote Control) This menu sub-branch permits the user to define whether
the unit is being controlled locally, or remotely.
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.
Tx
(Transmit) This menu sub-branch permits the user to define, on a parameter-
by-parameter basis, the transmit configuration of the unit.
Rx
(Receive) This menu sub-branch permits the user to define, on a parameter-
by-parameter basis, the receive configuration of the unit.
Group
This menu sub-branch permits the user to group a vertically aligned
modulator and demodulator into a modem, or to group any compatible plug-
ins for redundancy.
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
(EDMAC), 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.
Interface
(Interface) This menu sub-branch permits the user to define which electrical
interface type is active at the data connectors.
Ref
(Reference) This menu sub-branch permits the user to define whether the
unit should use its own internal 10MHz reference, or phase lock to an
externally applied reference, and if so, at what frequency. If the internal
reference is selected, it can optionally drive the connector.
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-Qx monitors for the
AIS condition, and if desired, this alarm may be masked.
ODU
(L-Band unit
only)
(Outdoor Unit) This menu sub-branch permits the user to configure externally
connected Low-noise Block Down Converter (LNB) and/or Block Up
Converter (BUC) for L-Band units.
CONFIG: Remote Tx Rx Group
Frame Interface Ref Mask ODU
