INTERNATIONAL  TELECOMMUNICATION  UNION

		     CCITT RECOMMENDATION SUMMARY


Rec. No. : E.434

Title : Subscriber-to-subscriber measurement of the public switched 
	telephone network

Study Group : II - Network Operation

Version : New

Date of adoption : 1992

Notes :	


Subscriber-to-subscriber service quality measurements are taken 
end-to-end. These measurements are taken:

	-   to relate network quality to customer’ expectations which 
	    are based upon previous experience with the network;

	-   to ensure that objective measures are made of the network;

	-   to ensure that acceptable thresholds of quality are being 
	    met;

	-   to ensure that regulatory requirements are met;

	-   to ensure that the distant correspondent’s level of 
	    quality meets other network providers’ needs.

To assess the network service quality requires the collection of the 
following:

	-   end-to-end network measurements results;

	-   customer perception of network quality.

The aim of Recommendation E.434 is to define end-to-end measurements 
of the public switched telephone network (PSTN), detailing:

	-   the methods and processes for testing;

	-   the measurements required;

	-   elements of an end-to-end system;

	-   the operation of an end-to-end system,

with recommendations to define interfaces and protocols.



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