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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.862
Title : Dependability planning of telecommunication networks
Study Group : II - Network Operation
Version : Revised
Date of adoption : 1992
Notes :
Recommendation E.862 is concerned with models and methods for
dependability planning, operation and maintenance of
telecommunication networks, and the application of these methods to
the various services in the international network.
Dependability planning may be accomplished by using essentially two
different methods.
Intuitive method
The level of dependability is determined by making a synthesis of
objectives and procedures presently used. It is a pragmatic method in
absence of an analytical method or in the case when necessary data
for a thorough analysis is not available.
This method reflects the present status, but is inconsistent in
achieving what Administrations actually want to attain:
the most economic level of dependability taking into account customer
needs and inconvenience.
Analytical method
The analytical method is based on principles defining the object of
dependability planning. The principles are realized through a
quantitative model. The level of dependability is deduced by applying
the model, taking into account all relevant factors in each planning
case.
- Basic principle - The main object of dependability planning is
to find a balance between the customersÆ needs for dependability and
their demand for low costs.
- Model - Fault consequences are expressed in terms of money and
are included as additional cost factors in planning and
cost-optimization. The cost factor reflects the customersÆ experience
of faults in the network, quantified in terms of money, as well as the
AdministrationÆs costs for lost traffic revenue and corrective
maintenance.
- Application - The Administration is provided with a method to
integrate dependability as a natural part of planning, taking local
information from the actual planning case into account. This method
enables the preparation of simplified planning rules.
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).