Title :
Characteristics of upstream channel noise in CATV-networks
Author_Institution :
Div. of Telecommun., Eindhoven Univ. of Technol., Netherlands
fDate :
12/1/1996 12:00:00 AM
Abstract :
Currently there is a growing demand towards interactive multimedia services using high capacity hybrid fibre-coax (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 architecture of the coaxial access network. The properties of the spectral noise signature resulting from the accumulation of noise have been studied by performing measurements in two major CATV-networks in Europe. Serious noise accumulation was found with levels up to resp. -70 dBm and -50 dBm in the two networks. Interference from short-wave broadcasting caused interference levels up to resp. -60 dBm and -40 dBm. We show that upstream noise is time dependent, and is not only caused by CATV-network subscribers
Keywords :
cable television; coaxial cables; multimedia communication; noise; optical fibre networks; radio broadcasting; radiofrequency interference; spectral analysis; subscriber loops; telecommunication channels; telecommunication traffic; television interference; television networks; CATV networks; Europe; coaxial access network; hybrid fibre-coax networks; interactive multimedia services; interference levels; noise accumulation; short-wave broadcasting; spectral noise signature; tree and branch architecture; upstream channel noise; upstream traffic; Bandwidth; Coaxial components; Europe; Hybrid fiber coaxial cables; Interference; Noise level; Noise measurement; Optical noise; Performance evaluation; Spine;
Journal_Title :
Broadcasting, IEEE Transactions on
