Sailor 250 FleetBroadband, Руководство пользователя, Страница: 173 / 288

Chapter 4: Using the web interface
Managing LAN network users 157
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Definitions for network terms
APN (Access Point Name)
APNs are provided from the Airtime Provider. They may also be defined on the
SIM card
The APN is used by the network user to establish a connection to the required
external network. This means that the terminal must know the APN in order to
be able to connect to the external network.
Header compression
The Header of a data packet contains control information belonging to that
packet. The information in the Header can take up a considerable amount of
bandwidth. In order to save bandwidth, you can use Header Compression,
meaning you compress the header information, leaving some of the
information out.
You can select whether or not to use Header Compression for your data
transmission.
• Header Compression enabled : Recommended for low-noise applications.
If you select Header Compression enabled, you will be using less
bandwidth on header information, leaving more bandwidth for the actual
payload.
• Header Compression disabled : Recommended in noisy environments.
If Header Compression is disabled, the system will be less sensitive to
noise.