INTERNATIONAL  TELECOMMUNICATION  UNION

		     ITU-T RECOMMENDATION SUMMARY


Rec. No. : E.711

Title :	User  demand  modelling

Study Group : II - Network Operation

Version : Revised

Date of adoption : 1991

Notes :	


ISDN users have various needs for information transfer. The user 
demand, as manifested in the user/CPE interface is characterized by 
an arrival process and by a call duration and/or a quantity of 
information attached to each arrival.

Through the mediation of the customer premises equipments (CPEs), user 
demands are translated into call demands for specific 
telecommunication services in the T interface. These call demands are 
modelled in Recommendation E.711 to allow the characterization of the 
traffic offered to the layers 1-3 of the ISDN.

Based on the call demand modelling, users will be characterized by 
the generating process of their originating and terminating call 
demands.



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