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).