Evaluation of Polycom's Lost Packet Recovery (LPR) Capability
Wainhouse Research - Ira M. Weinstein

Summary

In Q4 2007, Polycom asked Wainhouse Research (WR) to evaluate the performance of its newly released LPR (or Lost Packet Recovery) feature; an algorithm available on Polycom’s HDX video systems. LPR is designed to protect IP video calls from the impact of packet loss. As a part of this effort, WR researched and analyzed the methods used by currently available videoconferencing systems to conceal the effect of network errors. In addition, WR set up a number of video systems in our Atlanta test lab, placed a series of test calls including varying levels of packet loss, and observed the results. This allowed WR to assess each system’s ability to protect video calls from packet loss in a variety of conditions. After placing several hundred test calls between various systems, WR has concluded that LPR’s ability to protect the video call experience from the effects of packet loss – especially random / bursty packet loss - is exceptional.

This document, sponsored by Polycom, provides detailed information about the testing methodology and results of this evaluation.

This is the original English version of this evaluation report.
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