Q-Lite Satellite Modem Installation and Operating Handbook
5-1
Chapter 5
Introduction
5.1 Overview
The
Q-Lite™
satellite modem is designed primarily for closed network operation in mobile
environments, providing a data link between geographically distant sites via satellite.
Features include:
•
DVB-S2 (EN 302 307-1) and DVB-S2X (EN 302 307-2) operation including
Adaptive Coding and Modulation (ACM).
•
L-band frequency range of 950MHz to 2050MHz.
•
Closed network modes.
•
Variable bidirectional data rates between 2.4kbps and 200Mbps.
•
BPSK, QPSK, Offset QPSK, 8PSK, 8QAM, 16QAM, 16APSK, 32APSK, 64APSK
and 64QAM modulation schemes.
•
Forward Error Correction (FEC) options of Turbo Product Code (TPC), FastLink
low-latency Low Density Parity Code (LDPC) and DVB-S2/S2X.
•
Spectral roll-off factors of 5%, 10%, 15%, 20%, 25% and 35%.
•
Terrestrial interfaces including Internet Protocol (IP), RS422, V.35 and RS232.
•
Automatic Uplink Power Control (AUPC) automatically adjusts modem output
power to maintain a constant Eb/No at the distant end of the satellite link.
•
Optional front-panel display and keypad for local control.
•
Remote equipment can be controlled over the satellite via serial or IP traffic
interfaces. Remote modem control is supported via web browsing, the Simple
Network Management Protocol (SNMP), Telnet and the proprietary Paradise
Universal Protocol (PUP) command protocol.
•
XStream IP™
, providing an advanced integrated suite of IP optimisation and
traffic management features. These include Transport Control Protocol (TCP)
acceleration, header and payload compression, encryption, static and dynamic
routing, Dynamic Host Control Protocol (DHCP), IEEE 802.1p Quality of Service
(QoS) support, IEEE 802.1q VLAN support, traffic shaping and Adaptive Coding
and Modulation (ACM). A dual IPv4/IPv6 TCP/IP stack is provided. IPv4 support is
provided for all IP functions as the default. With respect to IPv6, bridging and
routing are supported along with an IPv6 embedded web server. Modem IP
addresses and static routes can also be entered and displayed in IPv6 format.
TCP acceleration
is supported at up to the maximum data rate for the modem.
Up to 10000 concurrent accelerated TCP connections are supported along with up
to 40,000 unaccelerated TCP connections. Bandwidth utilization when TCP
acceleration is enabled is typically over 90%.
Bridging
,
static routing
and
dynamic routing
(RIP V1 and V2, OSPF V2 and V3 and BGP V4) are all
supported. Ethernet, IP, User Datagram Protocol (UDP) and Real Time Protocol
(RTP)
header compression
are supported. The 14-byte Ethernet frame is
typically compressed to one byte. IP/UDP/RTP headers are typically compressed
to between one and three bytes. The one-way packet processing limit for header
compression is 60,000 packets per second (pps); the two-way limit is 45,000 pps.
IP/UDP/RTP header compression is compliant with the RFC 3095 (Robust Header
Compression) standard.
IP payload compression
is provided (compliant with the
