Nortel Meridian 1 Description, Installation And Operation page 77

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IP Telecommuter Engineering Guidelines
The design process is continual, even after implementation of the IP
telephony network and commissioning of voice services over the network.
Network changes – in actual IP Telecommuter traffic, general intranet traffic
patterns, network policies, network topology, user expectations and
networking technology – can render a design obsolete or non-compliant with
QoS objectives. The design needs to be reviewed periodically against
prevailing and trended network conditions and traffic patterns, at least once
every two to three weeks initially, then eventually on a quarterly basis.
It is assumed that the customer's organization already has processes to
monitor, analyze, and re-design both the Meridian 1 network and the
corporate intranet so that both networks continue to conform to internal
quality of service standards. When operating voice-over-IP services, the
customer's organization needs to incorporate additional monitoring and
planing processes. They are:
• Collect, analyze, and trend IP Telecommuter traffic patterns,
Monitor and trend one-way delay and packet loss, and
•
• Implement changes in the ITG and intranet when planning
thresholds are reached.
By instituting these new processes, the IP telephony network can be managed
to ensure that desired QoS objectives are always met.
Measured data of one-way delay (ms) and packet loss (%) for a given route
(link) should be checked against Figure 19 QoS regions to determine the QoS
of this route. Refer to Table 6 for more specific reading of QoS based on
numerical pairs of one-way delay and packet loss.
ITG Line 1.0/IP Telecommuter Description, Installation and Operation
Page 77 of 262