fWANs - I1070/T2000 Intro to Telecom Wide Area Networks...

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Unformatted text preview: I1070/T2000 Intro to Telecom Wide Area Networks Telecommunications Program University of Pittsburgh Objectives Describe dedicated WANs T1, T3 & SONET service (details ) Describe packet-switched WANs Frame Relay, ATM, MPLS Differentiate them Discuss stand-alone or IP-over-X Caveat This chapter is a chimera Material is hard to organize I dont like how Stallings does it But, I dont have a better way So, I will comment & criticize Without offering anything better But, Ill set a context in the next 4 slides - important Further evidence of a lack of good definitions Telecom/networking is important in industry But its still an evolving academic discipline Quality of Service Not the same as app quality But, obviously related What might be guaranteed? Loss & errors Flow, congestion, & error control Bandwidth ?? Temporal issues: arrival order, delay & jitter Impairments? Physical-Layer issues (?) Packets randomness: arrivals & size Mice & Elephants Queuing delay in a router: Fixed size packets Variable size packets router 1 2 2 > 1 Red packet +delayed router 2 mice elephant 1 3 3 >> 1 Red packet +++delayed Theres obviously a LOT of math to describe this not in this course Compensations? ++ Link Capacities Allocate sub-channels xm delay << elephants Allow high-priority mice In the router queues Research, not in the real public Internet Mousify the elephants Fragmentation within Layer 3 2 nd effect only Anecdote: $(fiber) v. $(QoS research) IP over X Internet is a WAN (not in this chapter) Ubiquitous host-to-host addressing & routing Datagram technology that allows elephants Anachronism to classic Ethernet (CSMA/CD) Compensations: Add clumsy QoS techniques to IP routers Mousify and/or use Virtual Circuits See other WAN technologies: FR, ATM, MPLS Used instead of IP or Underneath , to mousify IP &/or provide VCs WANs for Voice Requires very small & non-varying delays for natural conversation w/o delays & echo Difficult to provide this with packet-switching preferred method for voice transport has been circuit- switching Most businesses use public telephone networks Many have implemented private voice networks VoIP ( ) uses packet transmission Over internets and intranets (also see VoFR & VoATM) Enjoying gradually growing acceptance as an alternative WANs for Data Circuit-switched Packet-switched Specialty Voice Computer data Public PSTN Internet Private inter-PBX Intranets, FR, ATM Private leased lines - ?...
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This note was uploaded on 12/11/2009 for the course TELECOM 2000 taught by Professor Menon during the Fall '09 term at Pittsburgh.

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fWANs - I1070/T2000 Intro to Telecom Wide Area Networks...

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