Connection Services Abdulaziz S. Almulhem, Ph.D Department of Computer Engineering King Fahd University of Petroleum and Minerals.

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Presentation transcript:

Connection Services Abdulaziz S. Almulhem, Ph.D Department of Computer Engineering King Fahd University of Petroleum and Minerals Dhahran, Saudi Arabia

Connection services l What is connection services? l POTS l X.25 l ATM l ADSL

Introduction lUlUsers lClCommunication networks lSlServices

POTS l Plain Old Telephone Set l Basic service l No flow control l Low speed networking

1970s l IBM/SNA (1974) l Digital/DECnet (1975) l Sperry-Univac/Data communication architecture (1976) l Siemens/TRANSDATA (1978) l Honeywell/Distributed system architecture (1979)

X.25 (1/2) l CCITT (ITU-T) l Interfacing host to public data network l Link access protocol B (LAP B) l Go Back N l Window size 8 or 128 (satellite) l Bit stuffing

X.25 (2/2) Packet Switch Network

ATM (1/2) l Asynchronous Transfer Mode l Cell based switching technology l Integrate different data types l Traffic management (contracting, policing,…etc.) l high speed (OC192)

ATM (2/2) VC VP

DSL (1/2) l Digital subscriber line l started with 2B+D; now 52 Mbps! l Different flavors are available. l Uses TCM (Time Compress Multiplexing) for data transmission l Intense bit encoding per symbol l RS coding

DSL (2/2) Frequency (kHz) POTSUpstreamDownstream

Connection services Call Setup (SS7 or other) Time-Division Multiplexed Circuits (56/64K or T1/E1) X.25/Frame Relay Networks Central office (CO) CO

Summary l High speed communication. l Low operational and management costs. l support new needs. l Simplicity is the keyword.

References l W. Stallings, “High-Speed Network”, Prentice-Hall, l W. Chen, “DSL”, MacmillanTechnical Publishing, l J. Walrand, “Communication Networks”, Asken Associates, 1991.

WWW Sites l ATM Forum: l Frame Relay Forum: l More FR stuff: l DSL Forum: l IETF (Internet):