Comtech EF Data turboIP-G2 - Manual (Page 85)

turboIP-G2 Performance Enhancement Proxy Revision 2
Management via the CLI or Web Server GUI CD-TURBOIP-G2
5–11
5.2.3.2.1 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 ≤ 15 Mbps. Setting the WAN
transmission rate in excess of available bandwidth could lead to packet loss and degraded
performance.
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.
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 ≤ 155 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-G2s 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-G2 A, and 2048 kbps for
turboIP-G2 B.
• Example 2 – A turboIP-G2 is in place at a hub where there are three outbound satellite
links to three separate remotes with the following links:
ƒ Link A – Hub 4 Mbps Outbound, Remote A – 1536 kbps Inbound
ƒ Link B – Hub 3 Mbps Outbound, Remote B – 1024 kbps Inbound
ƒ Link A – Hub 2 Mbps Outbound, Remote C – 768 kbps Inbound
The Hub turboIP-G2 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-
G2 WAN setting to the Inbound TX data rate to the Hub.
5.2.3.2.2 Maximum Transfer Unit (MTU)
The MTU setting enables the turboIP-G2 to better support interoperability with other IP devices
requiring less than 1500-byte TCP payloads. The MTU default setting is 1500 bytes.
5.2.3.2.3 Congestion Control
The turboIP-G2 supports three congestion control algorthim modes:
• Per-Connection Mode – The Per-Connection Mode mirrors the standard TCP
congestion control algorthim. If any loss is detected, the window will be reduced by half.
It should be used to support dynamic bandwidth paths, where the bandwidth may be
different for any of the paths being accelerated by the turboIP-G2. This mode will
interpret any loss as congestion.