6. DATA COMMUNICATION
6-22
6.2
Mobile Packet Data Service (USB)
6.2.1 Introduction
The
Mobile Packet Data Service
complies with the communication protocol
defined by the Inmarsat Fleet system.
The transmission data rate over the satellite link is typically 20 kbps
(a 64 kbps
channel is shared with other users).
Switching between
MPDS
and Mobile
ISDN
service is done from the PC.
The PC must have Win 2000 or Win XP installed.
With MPDS you only pay for the amount of data received or transmitted, rather
than for the time you are connected.
MPDS can be efficient for applications that involves brief bursts of
communication followed by periods of inactivity, such as:
•
•
Internet/intranet
•
Navigational updates
•
Scada
•
Database queries
•
E-commerce
•
VPN - Virtual Private Network
Land
Earth
Station,
LES
SBS
Home
LES
R
LES
PC w/Windows
2000 or later
Internet
FELCOM 70
SBS (Shared Base Station) assigns channels to
the MPDS user and handles the MPDS
communication. Terminals in MPDS mode share
data channels with other users.
RLES (Regional Land Earth Station) sets terminal
in MPDS list. A terminal can not receive a voice
call when in MPDS mode.
Home LES (Home Land Earth Station) gives
access to MPDS service like Internet/e-mail. It
also handles the MPDS biling system.
FELCOM 50
FELCOM 30
System Overview
Содержание Felcom 50
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