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IEEE TRANSACTIONS ON BROADCASTING, VOL. 42, NO. 4, DECEMBER 1996
Characteristics of Upstream Channel Noise in CATV-networks.
R.P.C.Wolters, member IEEE The author is with the Telecommunications Division of the Eindhoven University of Technology, Den Dolech 2, EH. 12.26,5612AZ Eindhoven. E-mail: ELECRW @URC.TUE.NL
Abstract-Currently there is a growing demand towards interactive multi-media services using high capacity hybrid fibrecoax (HFC) CATV-networks.With regards to the realisation of upstream traffic, many problems occur with the accumulation of noise due to the tree and branch architectureof the coaxial access network [1,4]. In this paper, the properties of the spectral noise signature resulting from the accumulation of noise have been studied by performing measurements in two major CATVnetworks in Europe. Serious noise accumulation was found with levels up to resp. -70dBm and -50dBm in the two networks. Interference from short-wave broadcasting caused interference levels up to resp. -60dBm and - ...