HP MT40 User's Guide download pdf (Page 8)

HP Velocity Technology Overview 8

UDP QoE and packet loss

UDP does not provide a recovery strategy for packet loss, and applications that use UDP are

directly impacted by even small amounts of packet loss. UDP-based applications typically

react to packet loss by slowing down or reducing bitrate.

When packet loss occurs, the QoE for UDP applications, including PCoIP, RDP, VP8, SIP,

VoIP, and video is reduced, resulting in:

• Digital artifacts, smeared video

• Broken, choppy audio

• Low frame rate

Packet loss protection

HP Velocity protects against network loss by applying mathematical transformations to IP

packets.

Given a single packet as an input, the HP Velocity transformation will output one or more

segments. Each segment will logically represent a portion of the input packet and might carry

additional information, such as redundancy data.

The number of logical segments used to represent the original packet will vary based on

current network loss conditions. Figure 3 shows a packet being transformed and sent over the

network as three distinct segments.

Figure 3. HP Velocity transformation of a packet

Target Loss Rate

Different applications are tolerant to different levels of packet loss. Some applications perform

poorly with a small amount of packet loss while other applications perform satisfactorily even

with significant amounts of packet loss. HP Velocity adjusts its operation to ensure that each

application is protected from experiencing too much packet loss.

The Target Loss Rate (TLR) is the amount of loss that an application can tolerate while still

delivering an acceptable QoE. The default and recommended TLR for thin client applications

is 0.04%.

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HP MT40 User's Guide Page 8