rowe12 - Chapter 12 Local Area Network Agenda LAN...

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Chapter 12 Local Area Network
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Agenda LAN Characteristics Topologies Cables Wireless Transmission techniques Standards Systems Connecting Equipment Performance Factors Management Issues
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Characteristics Limited distance within a few miles High data rate - 2 to 100 Mbps Low error rate Good response time Private owned No regulation Share hardware, software, and data files
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Reasons for having LANs Sharing Local control Service - response time and reliability Information distribution systems
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Protocol Physical Data link control Media access control (MAC) logic to access shared medium (token passing protocols or carrier sense multiple access with collision detection or CSMA/CD) Logical link control assembling and disassembling frames Error control Flow control Interface with higher layers Frame (protocol data unit or PDU)
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Topologies Bus Ring as star
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Unshielded twisted pair (inexpensive) Coaxial cable (faster, expensive) Optical fiber (fastest, expensive) Balun (inexpensive transformer for different types of media) Hub Connect wires and cables Routing Repeater Error detection
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Wiring Cost and Documentation Cost considerations Wires Labor Place with future requirements with spare Documentation Tags Up-to-date documentation
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Wireless Access point: transmitter and receiver (transceiver) 500 feet indoors or 1,000 feet outdoors Wireless LAN adapter card in PC Frequency hopping or direct sequence spread spectrum technology
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Types of Transmission Techniques Basedband transmission Broadband transmission
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Baseband Transmission Digital signal or digitized signals for voice or video 1Mbps or higher Simple and easy
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Analog form Frequency division multiplexing
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rowe12 - Chapter 12 Local Area Network Agenda LAN...

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