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End-to-End DSL Architectures by Wayne C. Vermillion

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DSL Equipment

Equipment is usually diagrammed with a strict division between the central office/exchange side and the customer premises equipment (CPE), sometimes called customer-provided equipment. This section describes the basic CO/exchange equipment and the basic CPE equipment.

Customer Premises Equipment

CPE consists of the PC or another Internet Access Device (IAD) and a CPE modem—either an Asymmetric Transceiver Unit-Remote (ATU-R) or a Symmetric Transceiver Unit-Remote (STU-R). Because SDSL cannot be integrated with POTS service on the same wire pair, ADSL presents a more complex configuration when combined with voice traffic. In the Cisco world, the DSL modem is incorporated into a router and is represented by a small router symbol, ...

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