{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

MIT16_36s09_lec16

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

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
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 .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
16.36: Lecture 16 - A The Data Link Layer: Framing Eytan Modiano Eytan Modiano Slide 1
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 (flags) Eytan Modiano Slide 3
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Issues With Character Based Framing
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}