Insufficient Link Capacity; Quality Of Service (Qos) Determination; Qos Measurements - Nortel Meridian 1 Description, Installation And Operation

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IP Telecommuter Engineering Guidelines
Some network management systems have network planning modules that
compute network flows in the manner just described. These modules provide
more detailed and accurate analysis as they can take into account actual node,
link and routing information. They also help the technician assess network
resilience by conducting link and node failure analysis. By simulating
failures, re-loading network and re-computed routes, the modules indicate
where the network might be out of capacity during failures.
If there is insufficient link capacity, the following option should be
considered:
• Upgrade the link's bandwidth.
Bottlenecks caused by non-WAN resources are less frequent. For a more
thorough assessment the technician should also consider the impact of
incremental IP Telcommuter traffic on routers and LAN resources in the
intranet. Perhaps the IP Telecommuter traffic will traverse LAN segments
that are saturated, or routers whose CPU utilization is high. A customer
should consider re-routing scenarios in the case where a link breaks.
It should be noted that the service provided by the intranet is "best-effort
delivery of IP packets", not "guaranteed QoS for real-time voice transport."
End-to-end delay and error characteristics of the current state of the intranet
should be measured in order help the technician set realistic QoS expectations
when using the corporate intranet to carry voice services.
To use measuring tools requires that a starting point and an end point be
defined. The starting point can be a ping host on a LAN segment attached
to the router intended to support the IP Line card node. The destination node
can be a remote access server or a remote subnet depending on the network
topology. The requirement is briefly described as follows.
ITG Line 1.0/IP Telecommuter Description, Installation and Operation
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