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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : E.721
Title : Network grade of service parameters and target values for
circuit-switched services in the evolving ISDN
Study Group : II - Network Operation
Version : Revised
Date of adoption : 1991
Notes :
Recommendation E.721 provides network Grade of Service (GOS)
parameters for circuit-switched services in ISDN, based on the ISDN
Grade of Service concept and guidelines for selecting GOS parameters
provided in Recommendation E.720. The parameter values assume that
the network and the components are fully operational and take account
of the evolving nature of the ISDN and Signalling System No. 7
capabilities.
Recommendation E.721 defines the following GOS parameters:
- pre-selection delay;
- post-selection delay (overlap or en-bloc sending);
- answer signal delay;
- call release delay; and
- probability of end-to-end blocking
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).