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PCoIP Technology User Guide (Vol I)

6 Bandwidth

Considerations

Bandwidth usage in PCoIP Systems varies

depending on the use category and desired user

experience. This section outlines some

bandwidth configuration considerations.

Bandwidth Usage

PCoIP Systems have four general sources

bandwidth usage:

• Host to Portal imaging data – dominates

bandwidth

• HD Audio streams – typically significantly

lower bandwidths

• USB bridging – typically significantly lower

bandwidth

• System management – relatively negligible

bandwidth

Imaging Bandwidth

As imaging dominates bandwidth usage, it is

important to note these characteristics:

• Only changing screen areas generate imaging

related network traffic

• Low resolution displays have fewer possible

pixel changes resulting with less bandwidth

usage than high resolution displays

• Worst case: high resolution, high contrast, full

screen moving image (e.g. video games &

real-time 3D rendering)

• Configurability to reduce bandwidth

requirements vs. user experience

• Long periods with no pixel changes result in

low average network traffic

Audio and USB Bandwidth

HD audio and USB considerations:

• Audio compression can be enabled to reduce

bandwidth during congestion

• USB data is not compressed

• USB bulk data transfer (e.g. USB FLASH

drive) is often in opposite direction (i.e. Portal

→ Host) to imaging (i.e. Host → Portal) and

therefore is not additive

TER0806003 Issue 1

Bandwidth Priorities

PCoIP System bandwidth priorities are:

• USB and Audio are given priority

• Imaging uses remaining available bandwidth

Bandwidth Configuration

Bandwidth webpage parameters:

• Portal webpage defines Portal → Host

• Host webpage defines Host → Portal

• Bandwidth range: 3 to 220 Mbps

Figure 13: Bandwidth Webpage

The Bandwidth webpage has two fields:

Device Bandwidth Limit

• Limits maximum peak; only uses up to limit (or

less during periods of network congestion)

• '0' allows PCoIP Technology to adjust for

congestion; no congestion, no limit

• Recommended to set to link limit (minus 10%

headroom) of network connected to Host and

Portal

Note: Device Bandwidth Limit is applied

immediately after selecting Apply

Device Bandwidth Target

• Soft network limit during congestion

• During congestion, device bandwidth rapidly

reduced to target; then slowly

• Allows for more even distribution of user

bandwidth on congested trunks

• Should understand network topology well

before setting to non-zero value

Note: Device Bandwidth Target is applied on

next PCoIP Session after selecting Apply

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