Introduction, Overview, 1 overview – QVidium QVAVQ Series v4 User Manual

Page 3

User’s Manual v.4

QVidium

QVARQ QoS Proxy Server™

Introduction

Congratulations on purchasing the QVidium

QVARQ Series QoS Multimedia Proxy Server™.

Congratulations on purchasing the QVidium

QVARQ Series QoS Multimedia Proxy Server™.

QVidium

QVARQ QoS Multimedia Proxy Server™ – Front View

1.1 Overview

The QVARQ QoS Multimedia Proxy Server™ creates up to 50 copies of an incoming multimedia
stream and redistributes it to up to multiple destinations across the Internet or any computer
network with sufficient bandwidth. Since the Internet does not support multicast, and because of
packet loss on Internet connections, the QVARQ QoS Proxy Server can be an invaluable part of a
real-time multimedia distribution system.

The multimedia stream can be any continuous stream of UDP or RTP IP packets. Generally, these
multimedia streams would contain video and audio data multiplexed as an MPEG2 Transport
Stream. The QVARQ adds QVidium’s patented Quality of Service (QoS) technologies, including
ARQ error correction and clock synchronization, to correct missing packets, data re-ordering, and
intermittent delays, in incoming multimedia streams. In addition, it also adds ARQ error correction
to each of the replicated outgoing medial streams. Unlike conventional media servers which add
tens of seconds or delay to the media streams they distribute in order to handle network loss and
impairments, QVidium’s QVARQ can handle live real-time media streams while only adding a
minimal amount of delay. QVidium QoS technology automatically measures the round-trip time of
each network connection from each destination to the QoS Server in order to help minimize the
total delay, while preserving the integrity of the multimedia stream. This allows real-time,
interactive access to multimedia content across the Internet.

With these advanced Quality of Service (QoS) features, the QVARQ QoS Multimedia Proxy
Server™ can redistribute a video stream from nearly any location in the world to dozens of
locations across the world over nearly any type of IP network, including wireless connections and
the public Internet, with unsurpassed video transport quality.

The QVidium QoS Proxy Server consists of a transmit proxy module and a receive proxy module
that operate simultaneously and in tandem to receive and redistribute a media stream from an IP
video source, such as a QVidium encoder. The receive module applies ARQ error correction and
the other QVidium QoS technologies to recondition a stream that may have been transported over
the Internet or other network with impairments. It then forwards the QoS-corrected IP stream to the
transmit module. If the IP video source is connected over a lossless network, then the receive

Technologies, Inc.