HP mt41 HP Velocity Technology Overview - Page 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 highlatency 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 HP Velocity Technology Overview 7