CSE3213_03_LayeredArchitectureW2012 1.3

CSE3213_03_LayeredArchitectureW2012 1.3 - OSI Model (cont.)...

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11 OSI Model (cont.) Peer-to-Peer Communication over 7 OSI Layers message moves down through layers on sending device, over intermediate nodes, to receiving station, and then back up through layers at intermediate nodes (routers), data is pulled only up to network layer, so that next hop could be determined
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12 OSI Model (cont.) each layer in sending device adds its own information to message it receives from layer above it and passes whole package to layer just below it – reverse process occurs at receiving device when data reaches physical layer, it is changed into electromagnetic signal and sent along a physical link
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OSI Model: Physical Layer 1. Physical Layer coordinates transmission of bit-stream over physical medium, including representation of bits : to be transmitted, bits must be encoded into signals – electrical or optical; P.L. defines type of encoding – how 0s & 1s are changed to signals (e.g. 1 = +1V, 0 = -1V) bit length / data rate : P.L. defines how long a bit
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CSE3213_03_LayeredArchitectureW2012 1.3 - OSI Model (cont.)...

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