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 Iowa State University 20
Layer Q.931# Defines the signaling messages used to requestservices form the networkDecember 7, 2000 Iowa State University 21
Page 2 and 3: What is ISDN! IntegratedServicesDig
Page 4 and 5: N-ISDN and B-ISDNB! Two kinds of IS
Page 6 and 7: Why We Select ISDN (cont…)! More
Page 8 and 9: How to Distinguish ISDN fromTraditi
Page 10 and 11: How ISDN Works! Review some concept
Page 12 and 13: B - Channel! Transmit at 64 kbps an
Page 14 and 15: Other Channel- H Channel! A user ap
Page 16 and 17: BRI and PRI User/NetworkInterfaceDe
Page 18 and 19: Physical Connection to ISDNDecember
Page 22 and 23: Relationship of Layer 1,2,3! The IS
Page 24 and 25: Establishing the Link Layer! These
Page 26 and 27: ISDN Services and Applications! Bea
Page 28 and 29: Interconnecting LANs and ISDN! ISDN
Page 30 and 31: Remote node-toto-LAN andterminal-to
Page 32 and 33: ISDN Services deliver! Telco servic
Page 34 and 35: The Conclusion of ISDN! With ISDN y
Page 36: Questions?

ISDN - Iowa State University

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