WUSTL CIS 777 - Lecture Notes (21 pages)

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Lecture Notes



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Lecture Notes

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Pages:
21
School:
Washington University in St. Louis
Course:
Cis 777 - Telecommunications Networks
Telecommunications Networks Documents

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ISDN Raj Jain Professor of CIS The Ohio State University Columbus OH 43210 Jain CIS ohio state edu http www cis ohio state edu jain Raj Jain The Ohio State University 1 Overview q q q q History Interfaces and protocol layers Reference points Addressing Raj Jain The Ohio State University 2 Integrated Digital Networks IDN q q Integrated Both transmission and Switching Access was still analog Analog Switch T D M P C M F D M F D M Analog Switch F D M F D M Analog Switch a Nonintegrated Digital Switch The Ohio State University Digital Switch b Integrated 3 Digital Switch T D M P C M Raj Jain Integrated Service Digital Network q q q q q q q q Past IDN Integrated Digital Network Standardized digital techniques for switching and transmission T1 etc 1980 ISDN Integrated access to all services Digital end to end Digital subscriber loop A single set of interfaces for all services at multiple speeds Supports voice data videotex Supports both circuit switching and packet switching Out of band signaling Sophisticated network management and maintenance using Signaling System 7 SS7 Layered protocol architecture Raj Jain The Ohio State University 4 History q q q q q q q 1968 Study Group D set by CCITT to study digital voice 1972 G 702 Integrated digital switching and transmission IDN concept 1976 Digital switching and signaling SS7 spec 1980 G 705 One page recommendation on ISDN 1984 First set of standards in 1984 Inconsistent and incomplete 1988 Revised set of standards Implementation feasible 1992 Additional revisions Raj Jain The Ohio State University 5 ISDN Architecture non switched dedicated Permanent Subscriber Premises TE NT ISDN Switch User Network signaling 64 kbps nonswitched 64 kbps switched 64 kbps ckt nonswitched 64 kbps ckt switched Network Possibly ATM ISDN Switch Subscriber or Provider X 25Packet switching Frame Mode CCS User Network signaling Raj Jain The Ohio State University 6 ISDN Channels q q q B 64 kbps for data or voice D 16 or 64 kbps for signaling or packet



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