Thrane&Thrane TT-3084A Sailor Fleet77, User Manual, Page: 52 / 168

Getting started MPDS connection
3
Any calls with lower priority including MPDS sessions will
be pre-empted and a busy tone will be heard.
The distress and priority call is answered by picking up a
handset or by pressing

after which the ‘Priority Call’
LED will light steadily and the buzzer stops beeping.
The ‘Priority Call’ LED will turn off when the call is
terminated.
If the call is not answered by the ship, but terminated by
the RCC, the Alarm LED turns on to indicate that there was
an unanswered distress alert or priority call. Details about
the alarm can be checked in the alarm log.
3.5 MPDS connection
Please note: The MPDS service is only available on
Fleet55 systems when the vessel is positioned inside
an area with Spot Beam coverage. On Fleet77
systems the service is available in global beam.
Mobile Packet Data Service (MPDS) is a service that allows
the mobile user to remain “always connected” to the
Internet with billing based on the amount of data
transferred rather than the time spent online. This makes
the service an ideal and cost effective solution for
applications like Web browsing, email services, IP/LAN
connectivity and small to medium size file transfer. The
MPDS service provides a 64 kbit/s shared channel.
While in MPDS mode the TT-3084A is flagged busy in the
Inmarsat network. This means that the Fleet system is not
able to receive any incoming calls until it returns to normal
idle mode. However, the user can enable the Call Waiting
Notification feature. This allows the system to receive voice
calls during an ongoing MPDS call. For further information
about this feature, see section 3.5.1.
44 May 2005