Phantom Mode for DSL

The current technology used for data transmission over copper wires is DSL (Digital Subscriber Line). This technology supports the transmission of data and voice simultaneously over the same telephone channel because they use different frequency bands. Phantom-mode is a transmission mode that provides the creation of virtual channels that can be used both to attend new users and to increase the upstream/downstream rates (up 300 Mbps for small distances with 2 twisted pairs) of a single user. Another advantage of the phantom-mode is the use of the existing telephony infrastructure in such a way that it can be implemented at low cost. The aim of this paper is to present the phantom-mode as a tool to improve signal transmission in DSL and exhibit the behavior of the phantom-mode transfer function and impedance characteristic curves simulated in CST Cable Studio and measured in a Network Analyzer and Impedance Analyzer.