ISDN - Iowa State University
ISDN - Iowa State University
ISDN - Iowa State University
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Layer 2 Q.921! Describes the procedures to ensure error-freecommunication over the physical link and definesthe logical connection between user and network! Layer 2 Frame FormatFlag Address Control Information FCS Flag" Flag –Start of frame(end of previous frame)" Address-logical address including Terminal endpoint identifier" Control- Identifies type of frame" Information Layer 3 Information" FCS-Frame Frame Check Sequence" Flag-End of frame (start next frame)December 7, 2000 <strong>Iowa</strong> <strong>State</strong> <strong>University</strong> 20
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