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Service Independent Access Points (SIAP) to Optical Wide Area Networks. Joseph B. Evans, Victor S. Frost, Gary J. Minden Information & Telecommunication Technology Center University of Kansas evans@ittc.ukans.edu http://www.ittc.ukans.edu/ Gigabit Networking Workshop 29 March 1998.
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Service Independent Access Points (SIAP)to Optical Wide Area Networks Joseph B. Evans, Victor S. Frost, Gary J. Minden Information & Telecommunication Technology Center University of Kansas evans@ittc.ukans.edu http://www.ittc.ukans.edu/ Gigabit Networking Workshop 29 March 1998
Motivation • 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
Some 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
Protocol 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
Optical 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
Link 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
Other 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 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