<P> On the customer side, the DSL transceiver, or ATU - R, or more commonly known as a DSL modem, is hooked up to a phone line . The telephone company connects the other end of the line to a DSLAM, which concentrates a large number of individual DSL connections into a single box . The location of the DSLAM depends on the telco, but it cannot be located too far from the user because of attenuation between the DSLAM and the user's DSL modem . It is common for a few residential blocks to be connected to one DSLAM . </P> <P> The accompanying figure is a schematic of a simple DSL connection (in blue). The right side shows a DSLAM residing in the telephone company's central office . The left side shows the customer premises equipment with an optional router . The router manages a local area network (LAN) which connects PCs and other local devices . With many service providers, the customer may opt for a modem which contains a router and wireless access . This option (within the dashed bubble) often simplifies the connection . </P> <P> At the exchange, a digital subscriber line access multiplexer (DSLAM) terminates the DSL circuits and aggregates them, where they are handed off to other networking transports . In the case of ADSL, the voice component is also separated at this step, either by a filter integrated in the DSLAM or by a specialized filtering equipment installed before it . The DSLAM terminates all connections and recovers the original digital information . </P> <P> The customer end of the connection consists of a terminal adaptor or "DSL modem". This converts data between the digital signals used by computers and the analog voltage signal of a suitable frequency range which is then applied to the phone line . </P>

Which device is used to divide voice and data at subscriber end in dsl technology