DSL provides both a voice circuit and a point-to-point full –duplex data circuit.
DSL installations commonly use line splitters to separate the voice and data channels.
Data from the splitter goes to the DSL modem, which sends Ethernet frames for the customer’s LAN.
In the local end office, the data stream from the local loop goes to the main distribution facility (MDF) which splits off the voice to the PSTN
The data stream first goes to a DSL Multiplexer (DSLAM) which combines it with other DSL signals before sending it on the ISP.