Programmable logic design for an optical access network Sami Lallukka S Thesis Seminar on Networking Technology,

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Outline Background Optical Access Networking (OAN) project Communication networks today Communication networks tomorrow One solution for future metropolitan area networking OAN network demonstrator HDL design for the demonstrator Results of the thesis Future work

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Background Thesis written as a part of OAN research project at VTT Information Technology, Broadband Communications. Goals 1Define requirements for future optical access networking 2Find ways to support these requirements 3HDL design for the FPGAs in the OAN network prototype Supervisor: Prof. (pro tem) Samuli Aalto, HUT Instructor: Lic.Sc. (Tech.) Kari Seppänen, VTT

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Optical Access Networking (OAN) project TEKES-funded project, duration: beginning of end of 2003 Participating HUT, VTT, Nokia, Elisa –VTT Information Technology - Electrical equipment –VTT Microelectronics - Optical network solution –HUT Networking Laboratory - Teletraffic theory Goal is to define and demonstrate a fast optimised access feeder/distribution network Future requirements in metropolitan area networking need to be defined first. These are –Service operability issues –Traffic characteristics –Technologies available

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Communication networks today Three separated networks -Telephony -Data communications -Broadcast Overlaid structure in telecom and datacom Complex access network Bottleneck in MAN Expensive to maintain

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Communication networks methodology Distribution networks - interface towards end-users Feeder networks - traffic towards and from WAN Backbone networks - high speed trans. Access networks - collect and convert Transport networks - data transportation

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Traffic characteristics today Networks are optimised for one type of traffic only (except SDH/SONET) Only same type of traffic can be concatenated forming larger flows - SDH/SONET widely utilised Interworking functions located in metro region (tech. conversions) Connectionless and connect-oriented traffic Adequate QoS can be provided only for connectionless traffic Services located geographically over long distances (centralised) –most of the traffic goes through WAN New services emerging - need for more flexible network structure –security and privacy –streaming media and real-time

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Communication networks tomorrow Separated networks converged into single automated transport network Composed of hybrid networks with transparent transfer Passive Optical Networks (PON) main technology in access WDM widely utilised, especially in metropolitan area Fully optical and almost real-time wide area transport network Automatic configuration with automatic switching

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Traffic characteristics tomorrow Connectionless, connection- oriented and real-time traffic Interworking functions from access to distribution networks Intelligent servers - traffic concentrated in MAN Transparent transfer enables the transport of different technologies over the same transport network Adequate QoS for new services (real-time) Survivability issues important Automatic configuration and maintenance (cost reduction)

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Data over SDH/SONET (DoS) - solution for future networking Utilises manageable and widely used SDH/SONET transport Can later use Optical Transport Network (OTN) solutions DoS standard already supports number of access and transport technologies and even more in future Flexible two-layer transport solution enables transparent transfer Standardised by ITU-T

VTT TECHNICAL RESEARCH CENTRE OF FINLAND OAN network demonstrator - optical network Physical network - WDM with optical protection Topology: physical RING - logical STAR Every node directly connected to the HUB with their own wavelength

VTT TECHNICAL RESEARCH CENTRE OF FINLAND OAN network demonstrator - Node Access network - 2,5 Gbps SDH + 2 x Gb Ethernet Compact PCI frame, separated router and interface cards Network functionality implemented in three FPGAs Transport network - 2,5 Gbps SDH links

VTT TECHNICAL RESEARCH CENTRE OF FINLAND OAN network solution Data over SDH/SONET (DoS) Generic Framing Procedure (GFP) –provide the transparent transfer Virtual Concatenation (VC) –efficient bandwidth allocations Link Capacity Adjustment Scheme (LCAS) –adjustments for bandwidth allocations Support for RPR, Ethernet, MPLS, PPP, ATM

VTT TECHNICAL RESEARCH CENTRE OF FINLAND HDL design for the FPGAs Network - GbE HUB, POS support, DoS with APS, VC with SDH framing Control - Wavelength tuneable lasers, 12 MB SRAM, PCI interface

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Results of the thesis work Requirements and solutions for future metropolitan access networking Bandwidth increase in metro region - WDM utilisation More flexibility and scalability for networking - DoS QoS for new services - DoS Automatic configuration and maintenance - ASTN, ASON HDL design for the functionality of metropolitan optical feeder network Utilises DoS with Automatic Protection Switching (APS) Controls tuneable WDM network

VTT TECHNICAL RESEARCH CENTRE OF FINLAND Future work Based on the design presented here, a HDL implementation for the FPGAs in the OAN demonstrator will be created Variety of testing will be made with the demonstrator, concentrating on metropolitan and access networking Based on the testing results, possible new revision of the network might be designed and built OAN demonstrator could be used as a basis for future development in access area networking