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DSL Network Architectures
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Overview of a DSL network deployment including CPE, NAP and NSP components
This chapter provides a brief overview of available asymmetric DSL (ADSL) architecture options. A typical ADSL service architecture is illustrated in Figure 2-1. In the architecture illustrated, the network consists of Customer Premise Equipment (CPE), the Network Access Provider (NAP) and the Network Service Provider (NSP).
CPE refers to an end-user workstations (such as a PC) together with an ADSL modem or ADSL terminating unit router (ATU-R). The NAP provides ADSL line termination by using DSL access multiplexers (DSLAMs). The DSLAM forwards traffic to the local access concentrator, which is used for Point-to-Point Protocol (PPP) tunneling and Layer 3 termination. From the Layer 2 Tunneling Protocol Access Concentrator (LAC), services extend over the ATM core to the NSP.
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