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Chapter 2Overview of current CATV network pTable 2.3 – Broadband access technologies.TechnologyBandwidth &MediumModulation Max. Distance ApplicationHFC(1988)42 Mbps down10 Mbps and possiblyto 30Mbps upfibre/coax cableQAM,QPSKVSB100 miles fibre trunk1 mile coax cableHigh-speed Internet,VoIP access, motionvideo, VoD, remoteLAN access, etc.FTTC(End 1980s)51 Mbps down andup fibre/coax/twistedpairTDM downTDMA up100 miles fibre trunk1 mile coax cable500 feet copperVideo broadcasting,HDTV Interactivemultimedia, ATMtrafficFTTH(End 1980s)155 Mbps down andupTDM downTDMA up100 milesonly fibre linksVideo broadcasting,HDTV Interactivemultimedia, ATMtrafficSuperPONs2.3 Gbps down311 Mbps upTDM downTDMA up60 miles Video broadcasting,HDTV Interactivemultimedia, ATMtrafficADSL(1995)1.5-8.2 Mbps down16-640 kbps upsingle twisted pairDMT3.4 miles at 1.5 Mbps3.0 miles at 2.0 Mbps2.3 miles at 6.3 Mbps1.7 miles at 8.2 MbpsTelephony, high-speedInternet access, motionvideo, VoD, remoteLAN access.G.Lite,DSL-Lite orSplitterlessASDL(1997)1.5 Mbps down512 kbps upsinge twisted pairDTM 3.4 miles Telephony, IP voiceservices over a singletwisted copper looppairHDSL(1991)1.5 Mbps duplex ontwo twisted-pairlines, up and down2.0 Mbps duplex onthree twisted-pairlines, up and down2B1QCAP2.3 miles T1/E1 service betweenserver and phonecompany or within acompany; WAN, LAN,server accessSDSL(1996)1.5 Mbps duplex, upand down2.0 Mbps on a singleduplex line up anddown2B1QCAP2.3 miles Same as for HDSLVDSL(1995)13 to 53 Mbps down,1.5 to 2.3 Mbps upsingle twisted pairDMT, CAP0.9 miles at 13 Mbps0.6 miles at 26 Mbps0.2 miles at 53 MbpsSame services asADSL + Videobroadcasting, HDTVInteractive multimedia,ATM traffic over Fiberto the Neighbourhood.2-19