Comtech EF Data CDM-Qx, Инструкция по установке и эксплуатации

Страница: 56 / 224

CDM-Qx Satellite Modem Revision 6
Front Panel Operation MN/CDMQx.IOM
5.7.1 CONFIG
The sub-branches available are:
CONFIG: Remote Tx Rx Group
Frame Interface Ref Mask ODU
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.
5–8