CABLE-SATELLITE

CABLE-SATELLITE - Access by Cable TV & Satellite...

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© Copyright Roshdy H. M. Hafez 1990-2010 1 Outline 1. Cable distribution system ± Structure ± Basic parameters 2. Basic satellite parameters © Copyright Roshdy H. M. Hafez 1990-2010 2 Basic (old) Cable (one way) Basic (old) Cable (one way) Head-End subscriber drop tap Extension Amplifier Bridge Amplifier Trunk
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© Copyright Roshdy H. M. Hafez 1990-2010 3 Channel Arrangements Channel Arrangements © Copyright Roshdy H. M. Hafez 1990-2010 4 Channel Bands Channel Bands
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© Copyright Roshdy H. M. Hafez 1990-2010 5 Hybrid Fiber Hybrid Fiber -Coax Cable System Coax Cable System Head-End Fibre Node Fibre Node Fibre Node Distribution Sub-Network Subscribers Distribution Sub-Network Distribution Sub-Network © Copyright Roshdy H. M. Hafez 1990-2010 6 CATV Internet Access CATV Internet Access CATV Distribution System Internet
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© Copyright Roshdy H. M. Hafez 1990-2010 7 Overall System Overall System http://people.seas.harvard.edu/~jones/cscie129/nu_lectures/lecture13/CATV/CATV.html © Copyright Roshdy H. M. Hafez 1990-2010 8 Cable Modem Cable Modem ± The standard is known as DOCSIS ( Data over Cable Service Interface Specifications ) ± ITU-Approved cable modem specs ± Down-stream : 27-36 Mbps over the 50-750 MHz band ± Channel BW: 6 MHz (US), 8 MH (Europe) ± 64 or 256 QAM ± Up-stream : 0.32-10 Mbps over the 5-42 MHz ± 2 MHz channel BW ± TDM / Reserved & Contention time slots
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© Copyright Roshdy H. M. Hafez 1990-2010 9 Satellite Bands Satellite Bands 30 GHz 20 GHz 10 GHz 1 GHz L S C X Ku Ka L band: 1.5 – 1.65 GHz S band: 2.4 – 2.8 GHz C band: 3.7 – 7.0 GHz X band: 7.9 – 9.0 GHz Ku band: 10.7 – 15.0 GHz Ka band: 18.0 – 31.0 GHz © Copyright Roshdy H. M. Hafez 1990-2010 10 Classical Geostationary Satellite System Classical Geostationary Satellite System ES ES Clients Earth Station Satellite Head End Content Providers
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© Copyright Roshdy H. M. Hafez 1990-2010 11 Direct to Home Satellite Direct to Home Satellite Clients Satellite Gate Way Content Providers © Copyright Roshdy H. M. Hafez 1990-2010 12 Mobile Satellite Mobile Satellite Clients Satellite Gate Way Public Networks
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© Copyright Roshdy H. M. Hafez 1990-2010 13 Delay and Attenuation Delay and Attenuation GEO 35,800 km 500 to 2,000 km LEO 1 X 239 ms 3.3 to 13.3 ms Power Level Delay 5127 X 3204 X to © Copyright Roshdy H. M. Hafez 1990-2010 14 Antenna Size and Gain Antenna Size and Gain
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CABLE-SATELLITE - Access by Cable TV & Satellite...

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