џWPCL ћџ2BJ|xа АH аа АА X агга ХА6p&А6p&Х аеЮ† а Hр аааУ Уб cмˆ4 PŽТ б Fascicle II.3 Р-Р Rec. E.710 Ф ФPAGE1У Уб cмˆ4 PŽТ б ЮееЃ† а HH аааб cмˆ4 PŽТ бPAGE2У Уб cмˆ4 PŽТ б Fascicle II.3 Р-Р Rec. E.710 Ѓеа HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аУ Уб cмˆ4 PŽТ бRecommendation E.710 аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр8AСб cмˆ4 PŽТ бISDN TRAFFIC REQUIREMENTS OVERVIEW аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ б1ТX ТIntroductionФ ФЦЦ а H аС СThis Recommendation outlines the general consideration in modelling traffic flows in ISDNs. More detailed descriptions for specific services а H аand significant pointsб cмˆ4 PŽТ бУУ1жЫI а HH ааа1)ФФб cмˆ4 PŽТ бУ Уsignificant pointsФ Ф are points in the network where traffic flows and grades of service should be evaluated. Ыж) ФФб cмˆ4 PŽТ бin the network are given in Recommendations of the E.710 Series as follows: Та ТТ№ ТС€ СE.711 Р-Р User DemandЦЦ Та ТТ№ ТС€ СE.712 Р-Р User Plane Traffic ModelsЦЦ Та ТТ№ ТС€ СE.713 Р-Р Control Plane Traffic ModelsЦЦ Та ТТ№ ТС€ СE.714 Р-Р Management Plane Traffic Models.ЦЦ а H аС СAdditional Recommendations in this Series will be developed in the future to reflect ISDN developments. С СУУNoteФФ Р-Р Recommendations E.712 and E.714 are for further study. ‚У У2ТX ТContextФ ФЦЦ С СISDN concepts, services and networks are described in the Series I Recommendations. The E.710 Series of Recommendations have been developed consistent with the approach. However, the grouping of material in the E.710 Series concentrates on the important aspects from a traffic point of view of ISDN operations in the immediate future. а H аС СAn important modelling technique used to represent ISDN capabilities is the layered architecture described in Recommendations I.310 and I.320. The E.710 Series have been developed using this approach. At present the E.710 Series concentrates on lower layer (1Р-Р3) traffic flows. Higher layer traffic flows are for further study. С СThe user plane/control plane perspectives described in Recommendation I.320 have been used to provide two separate traffic models in Recommendations E.712 and E.713. Nevertheless, it should be kept in mind that many traffic engineering procedures described in subsequent E.700 Recommendations require incorporating traffic loads from both planes using the same resources. The influence of the management plane is for further study. а H аС СThe ISDN reference connections used in the E.710 Series are those given in Recommendation E.701. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС‚У У3С  Сб cмˆ4 PŽТ бUser demandЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ ФС СISDN users have various needs for information transfer. The user and his terminal equipment transform these needs into a series of call demands for available ISDN services. These transformations involve many functions including coding, and peerР-РtoР-Рpeer and interР-Рlayer protocols. The higher layer functions are not analysed in the E.710 Series. С СRecommendation E.711 starts from the expression by the user of a call demand to use the ISDN services defined in Recommendations I.230 and I.240. Corresponding traffic variables including the number of attempts per call demand are derived for the relevant attributes of each service. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС‚У У4С  Сб cмˆ4 PŽТ бUser planeЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ ФС СIn the user plane the attributes of some ISDN services give rise to additional traffic parameters beyond those used in telephony. Based on the user models of Recommendation E.711, Recommendation E.712 will be developed in the future to derive traffic models for each basic ISDN service using a common set of parameters that applies to all services. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС‚У У5С  Сб cмˆ4 PŽТ бControl planeЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ ФС СEach attempt from a terminal will result in signalling messages in the control plane. The number of messages and their length are highly dependent on: Та ТР-РТ№ Тprotocols (S.S. No. 7 and Q.931 digital access);ЦЦ Та ТР-РТ№ Тcall disposition (including user facilities);ЦЦ а H аТа ТР-РТ№ Тoriginating and terminating subscriber equipment configurations (e.g. overlap sending).ЦЦ а HH аС СControl plane traffic models given in Recommendation E.713. ‚У У6ТX ТFurther developmentsФ ФЦЦ а H аС СThe preceding sections of this Recommendation and the Recommendations of the E.710 Series concentrate on those services and facilities which will predominate in the first ISDNs to be implemented. а H аС СHowever, the ISDN concepts include the inherent possibility of developing completely new services and functions in response to changing user needs. This will result in new traffic situations that will need to be covered in the E.710 Series. Some of the situations which can be anticipated are: а H аТа ТР-РТ№ Тthe impact of supplementary services, such as call waiting, on control plane traffic;ЦЦ а H№ аТа ТР-РТ№ Тnew ISDN capabilities such as statistical switching and dynamic allocation;ЦЦ Та ТР-РТ№ Тconnectionless communications;ЦЦ Та ТР-РТ№ Тthe impact of userР-РtoР-Рuser signalling;ЦЦ а H аТа ТР-РТ№ Тthe impact of multipresentation type calls, and simultaneous use of different interactive and distribution services, involving multiР-Рslot and multipoint connections, and broadcast mode.ЦЦ а HH а