SDT 5000 User Manual
Document MBUD-0109v11
9. SDT 5000 OPERATIONAL STATES
The Operational States are defined by the MDS system. Under normal circumstances, the SDT 5000
will be in the “Operational” state (everything working correctly). Occasionally the unit will enter the
“Channel Search” state (the MET is searching for a Data Hub channel). Other states indicate an
abnormal condition.
The operational state is available on the GUI screens on the bottom line. The operational state is also
available via the command server command ‘
status’
.
Operational
This is the desired state for any MET. This means the unit is functioning
normally and it is ready to communicate through the Data Hub to a desired
destination. On startup up the SDT 5000 will transition through several other
states before reaching the “Operational” state.
Channel Search
In this state, the SDT 5000 is tuning to the various Data Hub (DH) frequencies it
knows, looking for a valid signal. This mode will occur under the following
conditions:
•
The Initial DH Frequency is wrong or was never entered.
•
The DH signal isn’t present due to a blockage (e.g. truck) for 3 minutes,
or the system provider took the DH signal off air. A permanent blockage
will render the SDT 5000 ineffective.
•
Antenna is out of alignment or damaged
Fade
In this state, the SDT 5000 is waiting for the Data Hub signal to improve. This
will occur if the DH signal isn’t present or is weak due to a blockage (e.g. truck,
mountain), or the system provider took the DH signal off air.
Pilot Search
When the channel search has failed to find a valid Data Hub frequency, the SDT
5000 will search for pilot frequencies. Tuning to a pilot allows the SDT 5000 to
correct for any frequency drift and restart the channel search.
Power Off
This state will occur when the satellite transceiver is off. The SDT 5000 is not
able to receive messages from the host while in this state.
SASK Invalid
This state means the Seed Access Security Key (SASK) parameter is incorrect.
The user has no control over this parameter. Please contact your Value Added
Reseller (VAR) to correct this situation.
MUI Invalid
This state means the MDS User Identification (MUI) parameter is incorrect. The
user has no control over this parameter. Please contact your Value Added
Reseller (VAR) to correct this situation.
BB Invalid
When a MET is in Sync, it is constantly receiving blocks of bulletin board (BB)
information, which includes certain operating parameters. One of these blocks of
data is called the descriptor. If the descriptor isn’t received within about 5
minutes, or illegal parameters are received, the SDT 5000 will set the operational
state to “BB Invalid”. While in this state the MET can’t transmit, but will
Version 1.1, 03/24/06
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