Network interworking with ATM system
Upper layer(s)
Service
specific
protocol
(SSP)
Upper layer(s)
SSP
SSCS
SSCS
CP AAL
CP AAL
ATM
ATM
ATM
PHY
PHY
PHY
PHY
PHY
PHY
Service specific CS
Common part AAL
     Service specific UNI                    ATM UNI
Terminal              IWF                  ATM network         Terminal