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6.2 Hardware Options
A single interface position is available that supports the follow ing options.
6.2.1
Quad ASI Option Card
The Quad ASI option card (part number P3710) provides four ports (BNC connectors)
that are independently configurable as inputs or outputs. Note that in DVB-S2 CCM
mode, only a single input and output can be used unless the optional multistreaming SAF
feature has been purschased – the mulstistreaming feature can be used in all DVB
modes i.e. DVB-S, DVB- DSNG and DVB-S2.
6.2.2
IP Traffic Option Card
The base modem supports Ethernet M&C interface only. In order to pass traffi c over
Ethernet, it is necessary to fit the IP Traffic option card (part number P3714).
This provides tw o 10/100/1000 (GigE) BaseT Ethernet connectors and supports a
number of features including:
1. Packet handling capability of up to 50000 packets per second.
2. Support for Multi- Protocol
Encapsulation ( ULE) of Ethernet frames over DVB.
3. TCP acceleration up to 80Mbps w ith support for up to 10000 concurrent TCP
connections. Typical satellite bandw idth utilization w ith acceleration sw itched on is
around 90%.
4. HTTP acceleration, w hich downloads typical w eb pages up to 30% faster on
average.
5. Header compression (Ethernet/IP/UDP) compliant to RFC3095 (ROHC - Robust
Header Compression) is supported at throughput rates up to 29000 packets per
second one-way, 22000 packets per second two-way. Ethernet headers are
typically reduced from 14 bytes to one byte and IP/UDP headers are typically
reduced from 28 bytes to betw een one and three.
6. Support for Ethernet point-to-point and point-to-multipoint bridging. All netw ork
topologies (including star, mesh and partial mesh) are supported. Transmission
can be unicast, multicast or bidirectional.
7. Quality of Service support (IEEE 802.1p) allow ing packet prioritisation.
8. VLAN tagging ( IEEE 802.1q) supporting the filtering of traffic streams according to
their VLAN identifier. This can be used in point-to-multipoint operation to filter just
the required packets at any particular remote modem.
9. Web page real-time diagnostic graphs that display Tx/Rx throughput (pps and
bps), dropped packets, errored packets, etc. for both terrestrial and satellite
interfaces.
10. PID filtering to allow particular MPEG2 TS streams to be pulled off at the
demodulator.
Vision Series Installation and Operating Handbook
Encapsulation ( MPE) and
6-2
Ultra
Leightw eight
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