University of Kansas

Joseph B. Evans, Victor S. Frost, Gary J. MindenInformation & Telecommunication Technology Center

University of Kansasevans@ittc.ukans.edu

http://www.ittc.ukans.edu/

Gigabit Networking Workshop

29 March 1998

Service Independent Access Points Service Independent Access Points (SIAP)(SIAP)

to Optical Wide Area Networksto Optical Wide Area Networks

University of Kansas

MotivationMotivation

• Objective• develop extremely high speed (100+ Gbps) switching• support multiprotocol switching

– SONET frames, ATM cells, frame relay, IP datagrams• support wide area networks

• Why?• develop technologies for future extremely high speed networks• provide flexible high speed transport for large traffic volumes of

different types and with varying requirements

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Some AssumptionsSome Assumptions

• Small address space• optical correlation expensive

• Large frames• for TDM systems, matching decision times relatively long• for WDM systems, tuning times relatively long

• Significant portions of datapath must be optical• electronics too slow for datapath• portions of control path may be electronic

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Overview of ArchitectureOverview of Architecture

W DMADM

IP RouterATM Switch

SONET ADM

ProtocolsEngine

OpticalProcessor

Link Q ualityEstim ator

W ide AreaNetwork

OpticalRegenerator

data, c lock, control(fiber and copper)

l i

SONET SONET orG igabit E thernet

SONET

W ide AreaNetwork

OAM

University of Kansas

SIAP ProtocolsSIAP ProtocolsIP D atagram s

A TM C ells

S O N E T Fram es

O ptica l F ram es

C onstant T im e

Ÿ O ptica l transport is transparentto carried services

errordetect

pream ble address O AM protocol

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Protocol EngineProtocol Engine

• Used to convert between existing networking services and the O-WAN transmission protocol

• Introduces direct support for multiple higher layer protocols at the bit transport layer• bit sequences within the optical framing structure identify the

particular service protocol engine (switch, router, etc.) to use

• Simplifies implementation and supports high speeds• direct demultiplexing to upper layer protocol engines avoids

unnecessary processing and queuing delays

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Optical ProcessorOptical Processor• Used to encode transmission frames, and select

and decode received frames utilizing high capacity (up to 10 Gbps) optical processing

• Provides the mechanism by which a flow is encapsulated and its associated framing fields are processed

• Supports datapath, control, and management functions such as framing, address/protocol identification, scrambling and descrambling, and error control

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Link Quality EstimatorLink Quality Estimator

• Used to estimate signal quality on each of many wavelengths (8-16 wavelengths) for OA&M functions• minimize complexity and cost of management overhead for

support of multi-wavelength systems

University of Kansas

Other ComponentsOther Components• WDM Add/Drop Multiplexers - Used to select a

single wavelength for further processing from a received WDM signal or inject a new wavelength into a transmitted signal• Cienna 16 l system

• Protocol-specific engines - Equipment that transmits and receives SONET, ATM, IP or other networking service protocols• Alcatel SONET ADMs• FORE/Nortel ATM switches• Cisco 12000 series routers