BDC5eChapter13 - Chapter 13: Frame Relay & ATM Business...

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Chapter 13: Business Data Communications, 5e
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Business Data Communications, 5e 2 WAN Alternatives
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Business Data Communications, 5e 3 WAN Alternatives (US Pricing) QuickTimeª and a TIFF (LZW) decompressor are needed to see this picture.
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Business Data Communications, 5e 4 Integrated Network Access Using Dedicated Channels
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Business Data Communications, 5e 5 Integrated Network Access Using Public Switched WAN
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Business Data Communications, 5e 6 Frame Relay Characteristics Designed to eliminate excessive X.25 overhead Control signaling takes place on a separate logical connection (nodes don’t need state tables for each call) Multiplexing/switching take place at layer 2, eliminating a layer of processing No hop-by-hop flow/error control
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Business Data Communications, 5e 7 Key Differences Between Frame Relay and X.25 Call control signaling is carried on a separate logical connection from user data. Multiplexing and switching of logical connections takes place at layer 2 instead of layer 3, eliminating one entire layer of processing No hop-by-hop flow control and error control. End-to-end flow control and error control are the responsibility of a higher layer, if employed at all.
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Business Data Communications, 5e 8 Frame Relay vs. X.25 Reliability Frame relay loses ability to do link-by-link flow and error control. X.25 link level protocol provides reliable hop-by-hop link control With increasing reliability of transmission and switching facilities, this is not a major disadvantage. Streamlining Frame relay reduces need for protocol functionality at the user- network interface, and reduces internal network processing Improvement in throughput using frame relay, compared to X.25, of an order of magnitude or more
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Business Data Communications, 5e 9 Frame Relay Architecture
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BDC5eChapter13 - Chapter 13: Frame Relay & ATM Business...

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