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Lecture-06 - Lecture#06 Today’s Lecture Objectives •...

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Unformatted text preview: Lecture #06 Today’s Lecture Objectives • Data Link Layer – Channel efficiency – PPP as an example of a point-to-point protocol Transmit/ACK Cycle • Time to think about delivering a packet across a single hop on a very small time scale. ven across a point oint link, we need • Even across a point-to-point link, we need to think about when we can transmit and when we have to wait Comm Types Across Different Media • Simplex: Communication in only one direction – Some satellite system • Half-duplex: one side gets to transmit at a time – Like a walkie-talkie – Note: some definitions confuse simplex with half-duplex • Full-duplex: multiple stations (typically two) can transmit at the same time – Requires send and receive capability – Somewhat like a telephone, but not quite Transmit/ACK Cycle • Time to get the frame on the wire • Propagation time from source to receiver • Time to process the frame • Time to send the ACK • Propagation time from receiver to source • Time to process the ACK Channel Efficiency...
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Lecture-06 - Lecture#06 Today’s Lecture Objectives •...

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