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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.431
Title : Service quality assessment for connection set-up and release
delays
Study Group : II - Network Operation
Version : New
Date of adoption : 1992
Notes :
The communications function of "connection establishment" is influenced
by how quickly end-to-end connections are implemented and how quickly
the network components are returned to a ready to serve state.
Recommendation E.431 addresses service quality assessment with respect
to connection set up and release delays in the public switched
telephone network (PSTN), and the integrated services digital network
(ISDN) as it evolves from the PSTN. Network performance design
parameters from a grade of service and traffic engineering viewpoint
for PSTN are given in the E.500-Series of Recommendations and for
circuit switched services in the ISDN are given in
Recommendation E.721.
In Recommendation E.431, three cases below are considered:
- voice service in the PSTN;
- non-voice services in the PSTN;
- voice and non-voice services in the ISDN as it evolves from the PSTN.
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).