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ATM over ADSL Probe in Telecom Italia Environment

This article discusses the performance evaluation of ATM/ADSL technology in the Telecom Italia environment. The study focuses on broadband multimedia and Internet services distribution, addressing functional requirements such as easy migration, simultaneous connectivity, security, multicast, multiple service class support, and quality of service. Test results demonstrate the ability of ATM/ADSL to handle high-rate downstream/upstream data, voice, and video services without any cell loss over ordinary subscriber loops.

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ATM over ADSL Probe in Telecom Italia Environment

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  1. ATM over ADSL Probein Telecom Italia Environment Stanislav Milanovic, Serco Group plc Alessandro Maglianella, Telecom Italia

  2. Introduction • ADSL gets its name from the asymmetry of how data is sent and received, providing different rates in the upstream and downstream directions. • This send/receive rate asymmetry is effective for many typical applications where more data downloads than uploads. • Business can use ATM/ADSL for all of their communications needs (Internet access, voice services, data services among sites and video services) with guarantees for quality of service.

  3. The Local Loop Constraints Figure 1. Typical Copper Feeder/Distribution Loop

  4. ADSL Modem Figure 2. ADSL uses FDM and echo cancellation to divide the available bandwidth for services

  5. Objective The goal of proposed access network configuration is to evaluate network performance of two integrated technologies — ATM and ADSL — for broadband multimedia and Internet services distribution.

  6. Requirements Telecom Italia have addressed the following functional requirements in order to enable a mass market for ADSL: • Easy Migration from existing ISP Access Infrastructure, • Simultaneous Connectivity: Internet and Corporate network, • Security, • Multicast, • Multiple Service Class Support, • Quality of Service Support.

  7. ATM/ADSL Networking Figure 3. End-to-end ADSL-based Broadband Network Architecture

  8. Test Bed Figure 4. Test Bed Layout

  9. Measurements Performed measurements were focused on a maximum length determination of the phone cable, with no cell loss during transmission, while varying a phone wire diameter under a constant downstream of 7.1Mb/s and under a constant upstream of 1.088 Mb/s in presence of various noise signals.

  10. Results Figure 5. Noise impact on signal propagation over phone cable

  11. Conclusion • Results of testing demonstrate that ATM/ADSL is able to send data/voice/video services under a high rate downstream/upstream within a range of nearly 4.5Km over ordinary subscriber loops without any cell loss. • For the future, it is likely that combinations of fibre feeding access nodes and VDSL feeding premises over copper (so called Fibre to the Neighbourhood, or FTTN) will be the next generation network topology for telephone companies in most countries of the world.

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