Gfast map

gfast map copy


Dark Blue: Firm commitments from incumbent: BT (10M), Belgacom, Australian NBN, Swisscom,  Austria, Bezeq Israel, Chunghwa Taiwan, Telus Canada, Telekom South Africa, SK Korea, (U.S.) AT&T, Century, Frontier, Windstream, Belgium, Omantel

Mid Blue: Smaller carriers in Germany, Norway, Finland, Japan

Light Blue: Incumbent likely:  France, Germany, Italy

300 MHz signals behave differently from 30 MHz signals. Old models, such as the ETSI model for VDSL, do not accurately measure performance at higher frequencies. In the chart, there's a major difference from the theoretical curves predicted by older models and the actual performance measured by Deutsche Telekom. (The ragged plot of the actual measurements falls far below the smooth curves of the older models.)    

   Rainer Strobel of Lantiq,  Reinhard Stolle of Hochschule Augsburg and Wolfgang Utschick of Technische Universit√§t M√ľnchen have built a new model that better fits the data. They write me "The industry is using a a cable model back from 1998, originally designed to describe cable properties for single line ADSL transmission. These models, adopted by ETSI and NIPP-NAI, served their purpose reasonably well for VDSL2  frequencies (<30MHz).   From Fast Net News