: This paper covers access network performance analysis by deploying ATM over ADSL within Telecom Italia experimental department "EXANET" (Experimental ATM Network). In this scenario, data traffic leaves customer site as ATM traffic running over ADSL modem links, gets aggregated via DSLAM (DSL Access Multiplexer) at the central office (CO) and then dropped onto the high-speed ATM switching fabric. Italian telephone company was eager to use ADSL as a way to relieve congestion on circuit-switched voice telephony system increasingly bogged down by the growth of the Internet and long data transmissions.