Comtech EF Data / Stampede
FX Series Administration Guide - Version 6.2.2
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Chapter: Overview - FX Series
Section: Two-Sided Solution
MN-FXSERIESADM6 Rev 6
1.4.3
Partial Content Update Caching
Intelligently caches Microsoft® updates and other prevalent software updates on the client side saving
significant bandwidth attributed to "Patch Tuesday". The FX Series caching methodology handles the
rather complicated procedures employed by Microsoft and other AV vendors to request updates by
requesting "partial objects". This reduces the amount of data sent over satellite links to reduce bandwidth
consumption and provide faster response times for end-users.
The FX Series Remote can dramatically curb bandwidth consumption by caching software updates
published frequently by Microsoft, Symantec, Adobe, Apple and many other leading software vendors.
The delivery of these updates is performed when software that resides on client devices downloads the
new content in the background by requesting "partial content" over HTTP. The complex nature of "partial-
content" HTTP requests thwarts the capabilities of most caching devices, however the FX Series Remote
appliance caching engine can handle these requests. Once the content is cached by the FX Series Remote,
subsequent retrievals by the updating agents that request "partial-content" will be satisfied by the FX
Series Remote appliance, eliminating the need to repetitively transfer the same updates over satellite
links.
1.4.4
Network Protocol Optimization
The FX Series provides application-aware modules for HTTP, CIFS, MAPI, POP3, SMTP, and FTP that
dramatically reduce costly handshakes and intelligently apply compression to lower bandwidth
consumption and reduce latency.
Stampede specializes in optimizing protocols by consolidating multiple transactions into a single
transaction, which eliminates round-trips, performing cache differencing on dynamically generated
content, and bi-directional data compression. In addition, our patented technology (TurboStreaming)
enables the transfer of previously compressed objects up to 5 times faster through intelligent multiplexing
across multiple TCP sessions.
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TCP and HTTP applications have chatty protocols that put added delay in satellite networks, as do
delay-sensitive such as Microsoft Exchange and CIFS.
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IT managers are placing thousands of applications on their satellite links. Many of these
applications are mission-critical, and compete over a limited amount of bandwidth.
1.4.5
Dynamic Data Deduplication
Dynamic Data Deduplication segments the incoming data stream, uniquely identifies the data segments,
and then compares the segments replacing repetitive streams of payload data with signatures prior to
transmission over the satellite links. This feature is not application protocol specific and can be applied to
most TCP application traffic. The FX Series intelligently monitors the data stream and is able to distinguish
protocol headers which change frequently from payload data which is often static. The FX Series extracts
this payload data and segments it into blocks, storing each block into persistent memory known as a "byte
cache". Blocks of data are replaced with a signature for that data. This generates significant data
reduction.
1.4.6
Header Compression/Packet Aggregation
As real time traffic moves to IP, there is a proliferation of traffic with small payloads. In this case, the
header bytes can be 2 to 4 times the number of payload bytes. For small voice packets, compression can
result in reducing the required data rate to 30 – 50% of the original. The FX aggregates packets into an
Ethernet frame and sends it to a peer, where the packets are restored. Header compression is integrated
into the traffic shaping, and maximum latency per queue can be set.
