ND SatCom SKYWAN IDU 7000, Manual

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108 Network Design and Engineering Guide 2010-10-26
Data Networking
SkyWAN
®
Internet Protocol Features
The physical layer is represented
-
on the terrestrial side by standard Ethernet LAN ports and a EIA-232 serial port for the serv-
ice;
- for the satellite interface by the Sky WAN
®
IDU modulator and demodulators MF-TDMA
functionality. Note, that the logical IP interfaces are not bound to a specific physical board:
i.e. even if only interface Sat-UT1 (SatOne) is used, data on this interface may be received
by the primary or the secondary demodulator.
IP based management functions are e.g. uploading configuration files via FTP or querying sys-
tem parameters using SNMP commands.
Two Sky WAN
®
IP features, which will be discussed in more detail later in this guide, extend the
IP functionality beyond packet forwarding:
- TCP acceleration (TCP-A) which enhances the data throughput over satellite links.
- Robust Header Compression (RoHC) which reduces the required bandwidth over the sat-
ellite link for voice and video over IP connections by compressing the packet’s RTP/UDP/
IP header.