Dell Precision R5400 Manual

Also see for Precision R5400: Brochure Technical guide Setup and quick reference guide Specifications Manual

Contents

PCoIP Technology User Guide (Vol I) TER0806003 Issue 1© 2008 Teradici Corporation Page 16 of 256 BandwidthConsiderationsBandwidth usage in PCoIP Systems variesdepending on the use category and desired userexperience. This section outlines somebandwidth configuration considerations.Bandwidth UsagePCoIP Systems have four general sourcesbandwidth usage:• Host to Portal imaging data – dominatesbandwidth• HD Audio streams – typically significantlylower bandwidths• USB bridging – typically significantly lowerbandwidth• System management – relatively negligiblebandwidthImaging BandwidthAs imaging dominates bandwidth usage, it isimportant to note these characteristics:• Only changing screen areas generate imagingrelated network traffic• Low resolution displays have fewer possiblepixel changes resulting with less bandwidthusage than high resolution displays• Worst case: high resolution, high contrast, fullscreen moving image (e.g. video games &real-time 3D rendering)• Configurability to reduce bandwidthrequirements vs. user experience• Long periods with no pixel changes result inlow average network trafficAudio and USB BandwidthHD audio and USB considerations:• Audio compression can be enabled to reducebandwidth during congestion• USB data is not compressed• USB bulk data transfer (e.g. USB FLASHdrive) is often in opposite direction (i.e. Portal→ Host) to imaging (i.e. Host → Portal) andtherefore is not additiveBandwidth PrioritiesPCoIP System bandwidth priorities are:• USB and Audio are given priority• Imaging uses remaining available bandwidthBandwidth ConfigurationBandwidth webpage parameters:• Portal webpage defines Portal → Host• Host webpage defines Host → Portal• Bandwidth range: 3 to 220 MbpsFigure 13: Bandwidth WebpageThe Bandwidth webpage has two fields:Device Bandwidth Limit• Limits maximum peak; only uses up to limit (orless during periods of network congestion)• ‘0’ allows PCoIP Technology to adjust forcongestion; no congestion, no limit• Recommended to set to link limit (minus 10%headroom) of network connected to Host andPortalNote: Device Bandwidth Limit is appliedimmediately after selecting ApplyDevice Bandwidth Target• Soft network limit during congestion• During congestion, device bandwidth rapidlyreduced to target; then slowly• Allows for more even distribution of userbandwidth on congested trunks• Should understand network topology wellbefore setting to non-zero valueNote: Device Bandwidth Target is applied onnext PCoIP Session after selecting Apply