Physical Layer - Slides (R2)

Physical Layer - Slides (R2) - CSCI 232 CSCI 232 Computer...

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SCI 232 CSCI 232 Computer Networking: hysical Layer Physical Layer George Blankenship Physical Layer George Blankenship 1
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Road Map Laptop computer Desktop System Laser printer Desktop System Transport Network Physical Laser printer Tower System Telephone IBM S/370 Router Desktop System IBM RS/6000 Modem Modem Laptop computer DECstation Fax Desktop System Router Physical Layer George Blankenship 2
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LAN • All devices Laptop computer interconnected by single media Desktop System Laser printer • Broadcast environment Physical Laser printer Router Data link • Data link layer is device to device IBM RS/6000 • Physical layer is vice to device (NIC) ax Desktop System Physical Layer George Blankenship 3 device to device (NIC) Fax
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WAN • Set of point-to-point links • Non-broadcast Device environment • Data link layer is odem Modem Physical device to device hysical is device to Modem Data link Physical is device to modem (serial port) Device Physical Layer George Blankenship 4
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Network • Interconnects the locations (networks) • Data link is router to Router router •P h ysical is router to odem Modem Physical modem (serial port) Modem Data link Router Physical Layer George Blankenship 5
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Lecture Outline • Concepts asic concepts and terminology Basic concepts and terminology – Signaling locking – Clocking – Errors • Data encoding •A s ynchronous/synchronous clocking • Interfaces Physical Layer George Blankenship 6
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Physical Layer Components • Signaling - voltage levels, optical forms (format of a basic unit of information) • Encoding - message unit definition • Access method - interface with data link Physical Layer George Blankenship 7
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Terminology • Bandwidth - frequency of the transmitted signal (Hz) ata rate - te that data can be sent (bps) Data rate rate that data can be sent (bps) • Noise - average level of noise in the communication path rror rate - te that errors occur during Error rate rate that errors occur during transmission Physical Layer George Blankenship 8
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Communication Basics • Communication is based upon change • Source generates changes estination detects changes • Destination detects changes • Information is contained in the changes Physical Layer George Blankenship 9
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Change Detection
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Physical Layer - Slides (R2) - CSCI 232 CSCI 232 Computer...

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