Appendices – QVidium QVAVQ Series v4 User Manual

Page 20

User’s Manual v.4

QVidium

QVARQ QoS Proxy Server™

Appendices

5.1 Appendix A: Transmit Proxy Configuration Parameters

Network Parameters

The fields below relate to Ethernet/IP video transport settings.

IP Transport: This selects the type of video IP packet encapsulation and error correction
used by the codec in generating a Video/IP stream. All packetized video transport
mechanisms encapsulate a multiplexed constant bit rate MPEG-2 transport stream.

•

ARQ uses QVidium’s patented error correction mechanism based on a time-
constrained selective packet retransmission algorithm. However it relies upon an
upstream channel on UDP port 7020.

•

RTP disables all error correction mechanisms, but still encapsulates the MPEG-2
multiplexed data according to RFC2733.

•

UDP is similar to the RTP transport above, but does not add the RTP header to the
UDP packets. Instead it simply encapsulates the MPEG-2 transport stream data
directly into the UDP/IP packet payload.

Destination IP Address or Hostname: This specifies the IP address or Hostname for the
Video/IP stream.

UDP Port: This specifies the UDP port number (P), base 10, for the Video/IP stream.

ARQ

The parameters below ONLY pertain to ARQ error correction. They will be ignored when
ARQ IP Transport is not selected.

ARQ Port: By default, ARQ normally sends upstream retransmission request packets on
UDP port 7020. You can change this ARQ Port setting to any valid and non-conflicting
UDP port. However, you must make certain that you specify the same port number at both
the encoder and the decoder. We suggest that you reset this to be the same port as the
media UDP port (usually 10000) to help with opening firewall problems.

Technologies, Inc.