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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.491
Title : Traffic measurement by destination
Study Group : II - Network operation
Version : New
Date of adoption : 1992
Notes :
Traditionally, traffic measurements for network planning and other
purposes have been taken on a circuit group basis. These measurements
could be used directly for circuit group administration, and, for
hierarchical networks, could be combined with pre-defined routing
information to approximate point-to-point traffic matrices.
However, these measurements do not allow accurate evaluation of
end-to-end blocking, and thus, do not reflect the Quality of Service
perceived by customers.
In addition, with widespread use of network management controls and
dynamic routing where the concept of final trunk groups vanishes,
destination-based measurements are required to allow evaluation of
network performance and Quality of Service.
The use of destination-based traffic measurements can be beneficial in
all three cycles of network operations which are described in
Recommendation E.490. Because service problems are identified
directly, trunk group additions and adjustments become
straightforward and so do network traffic management actions.
It should be noted that the advent of multi-service integrated
networks will require that data measured on a destination basis be
further split into classes of service. This will be necessary in order
to ensure service specific performance objectives in an environment
where each service has its own traffic characteristics.
Recommendation E.491 outlines two approaches to destination-based
measurements and defines the operational layers to which they each
apply.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword: UPI=ITU-5265; ASCII: UPI=ITU-2488).