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QMultiFlex-400™ Installation and Operating Handbook
6.2.22.3 TCP Acceleration
This is an On/Off control that controls point-to-multipoint TCP acceleration.
Packets received by the modem will be either bridged or routed as determined by the IP
mode setting.
When on, TCP packets are processed by a Performance Enhancing Proxy (PEP) that
overcomes performance problems associated with using standard TCP over satellite.
Configuring TCP Acceleration
•
Bridging Mode (Trunking mode with IP Traffic card).
In order to make it easier to set up, TCP acceleration does not use an IP address for the
IP traffic port when used in bridging mode (i.e. address is set to 0.0.0.0). M&C control must
be provided via a separate subnet to that used for satellite traffic. The modem gateway is
applied to the M&C subnet.
•
Routing Mode
In this mode, the M&C Ethernet port and IP Traffic port have dedicated addresses and must
be on separate subnets. All packets on both ports will be accelerated and passed over
satellite as required. The modem gateway is applied to either the M&C subnet or IP Traffic
subnet as specified by the user.
6.2.22.4 Round-trip Satellite Delay
Range:
0ms to 9999ms; step size: 1ms
Description:
This sets a satellite round-trip delay that is used in conjunction with TCP
acceleration. It controls the size of the modem's internal packet buffer to
match the bandwidth-delay product for the link (i.e. the link's data
capacity multiplied by the end-to-end delay). This helps to maintain the
throughput at its maximum level when TCP acceleration is on.
6.2.22.5 Header Compression
Due to processing constraints this feature is no longer usable.
6.2.22.6 Payload Compression
Due to processing constraints this feature is no longer usable.
Table 6-35 Round-trip Satellite Delay
6-52
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