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Introduction The Inmarsat Fleet Service
2
The Fleet services are prepared for operation with the next
generation of Inmarsat satellites (Inm-IV) expected in
2005. The services, which allow for a wide range of
applications, supported by the Inmarsat Fleet encompass:
• Circuit switched services:
• Mini M voice call (Global)
• 9.6 kbps data (Spot beam only)
• 9.6 kbps fax (Spot beam only)
• Packet switched services
• 64/28 kbps MPDS (Spot beam only)
(cf. Appendix B for a map on global and spot beam
coverage).
Service explanation:
The mini-M voice service is only for voice transmission.
The voice transmitted over the satellite is subject to a
compression process down to 4.8 kbit/s, which reduces the
bandwidth use and subsequently the cost.
The 9.6 kbps fax service is a service that enables G3 fax
machines employing one of the modem standards: V.27 or
V.29.
The 9.6 kbps data service allows you to establish a 9.6
kbps circuit switched data connection employing the
modem standard: V.24.
The MPDS service is a packet data service where the tariff
depends on the amount of data transmitted. This service is
a more cost-effective solution for web browsing, and other
applications where there is no need for constant
transmission of data in both directions. It is also suitable
for applications where a constant connection is required,
because the user is no longer charged the “per minute
rate”. The channel is a shared channel i.e. the transmission
4 May 2005