Nortel Meridian 1 Description, Installation And Operation page 51

IP Telecommuter Engineering Guidelines
A good design of the IP telephony network must begin with an understanding
of traffic, and the underlying network that will carry the traffic. There are
three preliminary steps that the technician must undertake.
• Forecast IP Telecommuter traffic. The technician must estimate the
amount of traffic that the Meridian 1 system will process via the IP
telephony network. This will place a traffic load on the LAN to
which the Meridian 1 and its IP Line Cards are connected.
• Assess WAN link resources. If calls from H.323 Clients traverse
through the corporate intranet, sufficient WAN resources must be
engineered to assure that adequate support is provided to voice
services. If calls are from a PSTN without going through the
corporate intranet, they will have capacity impact on the T-LAN
only.
• Measuring existing intranet's QoS. The technician must estimate the
quality of voice service the corporate intranet can deliver.
Description on how to measure prevailing delay and error
characteristics of an intranet will be presented.
After the assessment phase, the technician can design and implement the IP
telephony network. This design not only involves the ITG elements, but may
also involve making design changes to the intranet.
ITG Line 1.0/IP Telecommuter Description, Installation and Operation
Page 51 of 262