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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.432
Title : Connection quality
Study Group : II - Network Operation
Version : New
Date of adoption : 1992
Notes :
Recommendation E.432 suggests parameters, measurements and standards
to capture the customer perception of connection quality for all
services on the public switched telephone network (PSTN) and the
evolving integrated services digital network (ISDN).
In principle, when a new service is to be implemented, a market
analysis has to be undertaken to gain information on the service
quality that has to be offered to the users at a given tariff. Here a
problem appears to arise: users show their satisfaction in a
non-technical way: they judge connection quality ranging from poor to
excellent. The same problem applies to existing services.
The intention of Recommendation E.432 is to provide a guideline to
obtain end-to-end connection of acceptable quality, that satisfies
the end users.
In considering "connection quality", it is important to recognize that
the "user" must already have a complete end-to-end connection, i.e. a
distant end answer signal has been received before the connection
quality can be assessed. "Connection quality" does not include call
set-up delays, etc.
The "connection quality" has to be considered from the users
perspective and will be influenced by the subjective perception of
the user, the destination and route chosen, the transmission media
used and the total ressources available and applicable to the
end-to-end connection.
As a result, Recommendation E.432 considers the user perspective first,
and then develops the network parameters and objectives.
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).