Chapter1_2_Part_2

Chapter1_2_Part_2 - Dial-up Modem central office home PC...

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telephone network Internet home dial-up modem ISP modem (e.g., AOL) home PC central office ± uses existing telephony infrastructure ² home directly-connected to central office ± up to 56Kbps direct access to router (often less) ± can’t surf, phone at same time: not “always on” Dial-up Modem Introduction 1-15 telephone network DSL modem home PC home phone Internet DSLAM Existing phone line: 0-4KHz phone; 4-50KHz upstream data; 50KHz-1MHz downstream data splitter central office Digital Subscriber Line (DSL) ± uses existing telephone infrastructure ± up to 1 Mbps upstream (today typically < 256 kbps) ± up to 8 Mbps downstream (today typically < 1 Mbps) ± dedicated physical line to telephone central office Introduction 1-16 DSL Access Mux
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Residential access: cable modems ± uses cable TV infrastructure, rather than telephone infrastructure ± HFC: hybrid fiber coax ² asymmetric: up to 30Mbps downstream, 2 Mbps upstream ± network of cable, fiber attaches homes to ISP router ² homes share access to router ²
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This note was uploaded on 02/14/2012 for the course CSE 3214 taught by Professor Ross during the Winter '12 term at York University.

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Chapter1_2_Part_2 - Dial-up Modem central office home PC...

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