Comtech EF Data turboIP-45 - Manual (Page 16)

turboIP-45 Performance Enhancement Proxy Revision 0
Introduction CD/TURBOIP45.IOM
1–4
The key features of turboIP-45 that help alleviate TCP/IP performance bottlenecks are:
Quick Start turbo IP-45 makes full and immediate use of the links available, eliminating the
inefficiencies of the TCP slow-start algorithm.
Window Scaling turbo IP-45 supports window sizes up to 1 Gbyte, far exceeding the standard TCP
window size of 64 Kbytes.
Intelligent
Congestion Control turbo IP-45 is optimized for real-world, mixed-loss environments. It is capable of
distinguishing data corruption from congestion-induced data loss. Doing so prevents
unnecessary activation of congestion control mechanisms, which can lead to
significant reductions in transmission rates.
Rate Pacing 1
turbo IP-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.
Per-Connection 1
turbo IP-45 allows Per-Connection Mode to support dynamic bandwidth paths, where
the bandwidth may be different for any of the paths being accelerated by the turboIP-
45.
1
Note: Either Rate Pacing or Pre-Connection Mode can be selected to optimize
TCP acceleration performance.
Rate Pacing Mode Should be used when the bandwidth path for accelerated
TCP traffic remains constant with the set WAN Transmission Rate.
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.
Selective Negative
Acknowledgments
(SNACKs) SNACKs identify specific lost or damaged packets and request retransmission of
those packets. This provides for quicker recovery and better bandwidth utilization in
lossy environments.
Path MTU
Discovery turbo IP-45 allows Slipware to dynamically detect the allowed MTU for the path
between the Skip ware gateway and the peer gateway or end systems for
accelerated traffic, thus eliminating fragmentation of TCP segments that are too large
for the path MTU.
Error tolerant
congestion control turbo IP-45 allows the Per connection congestion control to tolerate some amount of
loss due to corrupted packets (bit errors) without reducing the throughput. Previous
releases treated any loss as an indication of congestion and reduced the throughput
by half
Tolerance for
packet reordering turbo IP-45 prevents spurious retransmissions due to packet reordering in the path
between two skip ware gateways
Support for large
queues with
congestion control turbo IP-45 prevents spurious retransmissions timeouts (RTO) caused by an increase
in RTT due to queuing, improving throughput when using the Per-Connection
congestion control on long delay networks that support large queues.