Performance of splitterless DSL at higher speeds (99-558)

This document reports on performance of a splitterless "V/ADSL" system that uses DMT with 4.3125 kHz wide tones over the band from DC to 5 MHz. Asymmetric 26/3.2 Mbps V/ADSL service reaches over 3000 feet, while symmetric service at 6.5 Mbps and 3.2 Mbps reaches are 3000 to 6000 feet for the conventional (or digitally duplexed) DMT. These ranges are maintained even in the presence of bridged-taps that will be evident in splitterless V/ADSL. Some potential vectored-DMT enhancements are also addressed, which allow mixture of medium asymmetric and long symmetric service in the same binder for unbundling purposes. This document also addresses spectral compatibility issues between V/ADSL lines themselves and with existing ADSL and G.pnt. __________________________________________________________________________________ NOTICE This contribution has been prepared to assist Standards Committee T1 Telecommunications. This document is offered to the Committee as a basis for discussion and is not a binding on Stanford University. The requirements are subject to change after further study. The authors specifically reserve the right to add to, amend, or withdraw the statements contained herein. 12/04/99 2 T1E1.4/99-558 Performance of splitterless DSL at higher speeds (99-558) J. Cioffi, F. Sjoberg, G. Ginis, R. Nilsson, and W. Yu Department of Electrical Engineering Stanford University, Stanford, CA 94305 Phone: 650-723-2525 ; Fax: 650-724-3652 ABSTRACT This document reports on performance of a splitterless "V/ADSL" system that uses DMT with 4.3125 kHz wide tones over the band from DC to 5 MHz. Asymmetric 26/3.2 Mbps V/ADSL service reaches over 3000 feet, while symmetric service at 6.5 Mbps and 3.2 Mbps reaches are 3000 to 6000 feet for the conventional (or digitally duplexed) DMT. These ranges are maintained even in the presence of bridged-taps that will be evident in splitterless V/ADSL. Some potential vectored-DMT enhancements are also addressed, which allow mixture of medium asymmetric and long symmetric service in the same binder for unbundling purposes. This document also addresses spectral compatibility issues between V/ADSL lines themselves and with existing ADSL and G.pnt.