5 - Part 2 Packet Transmission Packets frames Local area...

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Unformatted text preview: Part 2: Packet Transmission Packets, frames Local area networks (LANs) Wide area networks (LANs) Hardware addresses Bridges and switches Routing and protocols Packets, frames and error detection • Packets and frames • Control data and byte stuffing • Error detection - parity bits, checksums and cyclic redundancy checks Packets • Most networks transmits data in small blocks called packets – helps to detect transmission errors – gives fair access for a shared connection between many computers • These are packet networks or packet switching networks An example of fair access A wants to send a 5 megabyte file to C B wants to send a 10 kilobyte file to D network speed is 56,000 bits per second Packets and time division multiplexing • Packet networks use a form of TDM Packets and hardware frames • Each type of hardware defines its own format/wrapping for a packet called a frame Simple example of framing • A frame may include “unused” control data values to mark both its beginning and end • Advantage is error detection: – transmitter crashes => eot will not arrive – receiver crashes => soh marks next valid frame • Disadvantages: – requires two extra characters per frame – cannot carry arbitrary values (e.g, soh and eot) Byte stuffing • So control characters can be included in data • Reserve a special character to mark the occurrence of control characters...
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5 - Part 2 Packet Transmission Packets frames Local area...

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