Broadband access using subcarrier multiplexing and asymmetric digital subscriber lines

A broadband access system using subcarrier multiplexing on the optical fiber and asymmetric digital subscriber lines (ADSL) on unshielded twisted-pairs is proposed to deliver broadband services. In this hybrid-fiber/twisted-pair (HFTP) system, the digital multiplexing/demultiplexing process is moved back to the central office by using subcarrier multiplexing for fiber transmission. Instead of installing in remote node, ADSL transceivers are installed inside the central office to greatly reduce the remote node complexity. The local node simply down-converts the subcarrier multiplexed ADSL signal to baseband signal, suitable to send directly into the twisted-pair. The reducing of complexity could result in a lower initial installation cost, especially for a low service penetration rate