Nortel 1000 Description, Installation And Operation Manual page 126

Page 126 of 644
553-3001-363 Standard 2.00
ITG engineering guidelines
New considerations come into play now when the same corporate network is
expected to deliver voice traffic. The intranet introduces impairments, delay,
delay variation, and data packet loss, at levels that are higher than those
delivered by voice networks. Delay between talker and listener changes the
dynamics and reduces the efficiency of conversations, while delay variation
and packet errors causes introduces glitches in conversation.
Connecting the IP Trunk 3.01 (and later) nodes to the corporate intranet
without preliminary assessments and QoS mechanisms can result in
unacceptable degradation in voice service. Correct design procedures and
principles must be considered.
A good design for the IP Trunk 3.01 (and later) network must begin with an
understanding of traffic and the underlying network that will transmit the
traffic. See Figure 24 on
September 2004
page 127.