HP MT40 User's Guide download pdf (Page 7)

HP Velocity Technology Overview 7

3. LiveTCP: Optimizes TCP throughput over all networks and provides latency mitigation for

RDP, RGS, and ICA protocols. HP Velocity improves the throughput of streaming and remote

desktop applications by modifying TCP flow control mechanisms to perform better in high-

latency environments. For more information, see “LiveTCP

” on page 13.

LiveQ

Packet loss occurs when one or more data packets traversing a network do not reach their

destination. A number of factors contribute to packet loss, including signal degradation over

the network, network congestion, corrupted packets, and hardware issues.

Packet loss caused by network impediments can result in QoE issues with streaming

applications, Voice over IP (VOIP), video conferencing, and virtualized environments.

TCP QoE and packet loss

TCP, a network transport protocol, guarantees the reliable delivery of packets. When packet

loss occurs, TCP stops delivering packets to ensure that packet order is preserved. The

receiver will request retransmission, or the sender will automatically resend any

unacknowledged segments. At this point, TCP slows down and connection throughput is

decreased. As an example, in a GbE network, 1% packet loss with 100 ms of latency throttles

TCP throughput to 1 Mbps.

Applications typically affected when TCP flows are interrupted by packet loss include RDP,

RemoteFX, RGS, ICA, video, and audio streaming. The QoE impact of packet loss on TCP

includes:

• Low frame rates

• Slow file transfers

• High lag

• Unresponsive user interfaces

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HP MT40 User's Guide Page 7