MIT16_36s09_lec16

MIT16_36s09_lec16 - MIT OpenCourseWare http://ocw.mit.edu...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 16.36 Communication Systems Engineering Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 16.36: Lecture 16 - A The Data Link Layer: Framing Eytan Modiano Eytan Modiano Slide 1 Data Link Layer (DLC) Responsible for reliable transmission of packets over a link Framing: Determine the start and end of packets Error Detection: Determine when a packet contains errors Error recovery: Retransmission of packets containing errors DLC layer recovery May be done at higher layer Eytan Modiano Slide 2 Framing _____________________________________ 010100111010100100101010100111000100 Where is the DATA?? Three approaches to find frame and idle fill boundaries: 1) Character oriented framing 2) Length counts- fixed length 3) Bit oriented protocols (ags) Eytan Modiano Slide 3 Character Based Framing Frame SYN SYN STX Header Packet ETX CRC SYN SYN SYN is synchronous idle STX is start text ETX is end text Standard character codes such as ASCII and EBCDIC contain special communication characters that cannot appear in data Entire transmission is based on a character code Eytan Modiano Slide 4 Issues With Character Based Framing...
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This note was uploaded on 11/07/2011 for the course AERO 16.38 taught by Professor Alexandremegretski during the Spring '09 term at MIT.

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MIT16_36s09_lec16 - MIT OpenCourseWare http://ocw.mit.edu...

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