Comtech EF Data turboIP-45 - Manual (Page 43)

turboIP-45 Performance Enhancement Proxy Revision 0
Configuring turboIP-45™ CD/TURBOIP45.IOM
4–19
4.5.5.1 WAN Transmission Rate
Set the maximum bandwidth available for TCP traffic on the WAN interface (a number, followed
by a space and 'bps', 'kbps' or 'Mbps'). Must be ≥ 10 kbps and ≤ 45 Mbps. Setting the WAN
transmission rate in excess of available bandwidth could lead to packet loss and degraded
performance.
For a mix of TCP / non-TCP traffic, use these settings to limit the bandwidth for TCP traffic:
Example 1 – A pair of turboIP-45s is used to accelerate TCP traffic on a satellite link where
satellite Modem A has a TX data rate of 12 Mbps, and satellite Modem B has a TX data rate of
2048 kbps. Use WAN setting 12 Mbps for turboIP-45 A, and 2048 kbps for turboIP-45 B.
Example 2 – A turboIP-45 is in place at a hub where there are three outbound satellite links to
three separate remotes with the following links:
• Link A – Hub 4 Mbps Outbound, Remote A 1536 kbps Inbound
• Link B – Hub 3 Mbps Outbound, Remote B 1024 kbps Inbound
• Link A – Hub 2 Mbps Outbound, Remote C 768 kbps Inbound
The Hub turboIP-45 WAN is set to 9 Mbps to equal the total available Outbound bandwidth
(4 + 3 + 2). In this example, create Selective Acceleration Rules to limit the bandwidth to match
the Outbound TX data rate for each Remote. Set the Remote turboIP-45 WAN setting to the
Inbound TX data rate to the Hub.
4.5.5.2 Maximum Transfer Unit (MTU)
This setting enables the turboIP-45 to better support interoperability with other IP devices
requiring less than 1500-byte TCP payloads. Default setting for the MTU is 1500 bytes.
4.5.5.3 Compression
With Compression enabled, the turboIP-45 will compress accelerated TCP Data, Compression is
not applied to non-TCP or non accelerated TCP.
4.5.5.4 Congestion Control
Per-Connection Mode – Should be used to support dynamic bandwidth paths, where the bandwidth
may be different for any of the paths being accelerated by the turboIP-45.
Rate Pacing Mode– Should be when bandwidth path for accelerated TCP traffic remains constant
with the set WAN Transmission Rate. In Rate Pacing Mode, the turboIP-45 meters out bursty traffic
at a rate not to exceed the configured transmission rate of the satellite channel. This prevents the
satellite channel from becoming congested and will maximize accelerated TCP throughput to match
the set WAN Transmission Rate.