Optical network evolution
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The document discusses network transport evolution at a telecommunications provider. It covers trends like increasing packet traffic, the benefits of coherent detection in DWDM networks, and strategies for deploying 100G channels. It also debates the relative merits of using OTN switching versus router-based switching in the network backbone for efficiency and fast restoration, noting challenges of each approach. Maintaining support for legacy interfaces is also discussed.
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Optical network evolution
- 1. Click to edit Master subtitle style Transport Network Evolution – 2013 Campinas, May 2013
- 2. AgendaAgenda Transport Network Review Transport Network Keep On Evaluating o DWDM: Next Steps on the Network o Backbone Efficiency o Unified Control Plane o Access/Aggregation Efficiency Conclusions
- 3. Transport Network Review Traffic Profile Layers Access Backhaul Aggregation Backbone Transport 2G/3G Backhaul DSLAM Backhaul Traffic concentration Traffic connection Local Metropolitan Nation wide Service Platform Traffic Profile Oi – GTEC – Rights 3 Access Access Backhaul DSLAM Backhaul MSAN Backhaul Local Service Each layer takes care of the its traffic properly Lower deployment cost Suitable protection strategy per layer Optimize the bandwidth usage Gradual features introduction 5 Share, trends and impacts. Packet traffic is majority. The higher rates introduced right from the access. LTE HSI IPTV 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 2008 2009 2010 2011 2012 2013 2014 2015 2016 TDM Packet Today
- 4. 0 50000000 100000000 150000000 200000000 250000000 Technology Scenario Profile per layer Access Backhaul Aggregation Backbone 2G/3G/4G MBH OLT Backhaul MSAN Backhaul Traffic concentration Traffic connection Statistical gains opportunity 40000000 60000000 80000000 100000000 TDM Transport Network Review Technology Disruption 12 0 20000000 40000000 PACKET Oi – GTEC – Rights 18 Access Backhaul Aggregation BackboneTransport 2G/3G/4G MBH OLT Backhaul MSAN Backhaul Traffic concentration Traffic connection Traffic interest Local Metropolitan Nation wide Technology Solution basis ASON on top of OTN as a toll for provisioning, resources optimization and availability improvement taking in account meshed networks combined to a restoration schemes with shared structures. SDH Packet MPLS-TP TDM OTN ASON
- 5. Transport Network Review Photonic Evolution DWDM Coherent detection + DSP started a revolution in the DWDM industry: Eliminated the sensivity to the most significant impairment for high speed transmission over fiber. Chromatic Dispersion. Eliminated the sensivity to PMD. Old fibers life extended. Performance for 40 and 100G channels similar to 10G. Even gains in performance can be achieved when eliminating DCF. Latency improvements. The carrier fits into the ITU-T 50GHz grid. Absolute Mbit/s cost reduction. Photonic Evolution Oi – GTEC – Rights 20 DWDMSDH 155M 622M 2.5G 10G 40G 100G Mbps Cost 23 ROADM + WASON is suitable for network flexibility (provisioning) WASON and ASON (OTN) under the same control plane allow enhanced availability with lower costs Access Backhaul Aggregation Backbone Transport 2G/3G/4G MBH OLT Backhaul MSAN Backhaul Traffic concentration Traffic connection Traffic interest Local Metropolitan Nation wide Technology SDH Packet MPLS-TP TDM OTN ASON DWDM Technology WASON
- 6. Transport Network Review Summary Capacity all layers DWDM 40G/100G Access Aggregation efficiency PTN MPLS-TP TDM support and OAM tools are keys SynchEth and 15588v2 Coherent improves the network performance Backbone OTN Switch ASON + Unified Control Plane allows Oi – GTEC – Rights 24 Backbone efficiency OTN Switch + ROADM ASON + WASON Unified Control Plane allows max efficiency Access Backhaul Aggregation Backbone Transport 2G/3G/4G MBH OLT Backhaul MSAN Backhaul Traffic concentration Traffic connection Traffic interest Local Metropolitan Nation wide Technology SDH Packet MPLS-TP TDM OTN ASON DWDM Technology WASON
- 7. Transport Network Keep On Evaluating Summary Capacity all layers DWDM 40G/100G Access Aggregation efficiency PTN MPLS-TP TDM support and OAM tools are keys SynchEth and 15588v2 Coherent improves the network performance Backbone OTN Switch ASON + Unified Control Plane allows Novelties Discussions Discussions Oi – GTEC – Rights 24 Backbone efficiency OTN Switch + ROADM ASON + WASON Unified Control Plane allows max efficiency Access Backhaul Aggregation Backbone Transport 2G/3G/4G MBH OLT Backhaul MSAN Backhaul Traffic concentration Traffic connection Traffic interest Local Metropolitan Nation wide Technology SDH Packet MPLS-TP TDM OTN ASON DWDM Technology WASON Discussions
- 8. DWDM: Next Steps on the Network - Novelties Coherent Detection + DSP on receiver side already rolling out. Coming up DSP on the transmitter side allowing: Over 100G Nyquist DWDM channels. Improved efficiency in bandwidth; Dynamic flexible modulation. Dynamic adaptation of the channels capacity based on optical impairments and available spectrum; Transport Network Keep On Evaluating spectrum; Optical effects pre compensation. ROADM with flexible channel spacing.
- 9. DWDM strategy for evolving Deploy brand new line systems for the coherent channels (100G). Maximize the benefits brought by the coherent technology eliminating the CD compensators and the dual stage OLA. Best performance even over old fibers. Introduce the ROADM ready for Transport Network Keep On Evaluating ROADM ROADM ROADM ROADM TPD Introduce the ROADM ready for flexible channel spacing. At least the hardware should be ok for the next channeling steps. 12.5G granularity. Next gen coherent transponders. Transmitter side DSP enabling super channels and multiple dynamic modulation schemes. ROADM ROADM ROADM ROADM ROADM ROADM 10G DWDM Line System Coherent DWDM Line System ROADM ROADM 50G grid ROADM Flexible grid ready ROADM TPD TPD TPD TPD Next gen coherent transponder
- 10. DWDM strategy for evolving – time frame 100G coherent systems ready. ROADM ready for flexible channel spacing (???). Few vendors focused on explore it… Transport Network Keep On Evaluating Today Next Step Next Next Step Protect the fixed grid ROADM investment 10G DWDM Line System Coherent DWDM Line System ROADM ROADM 50G grid ROADM Flexible grid ready ROADM ROADM ROADM TPD Next gen coherent transponder TPD Super Channels Enabled ROADM ROADM 100G Channels Shorter term Longer term
- 11. DWDM strategy for evolving – time frame Despite the very valuable industry working on developing the over 100G channels, it seems 100G is going to have a longer and healthy life supporting the heavy traffic over the networks. Challenges for the super-channels and the flexible dynamic rate adaptation: The reaching range for higher bandwidth. Wider networks may not get the advantages of higher modulation formats due to the longer distances. 16QAM < 600km reaching. Transport Network Keep On Evaluating 16QAM < 600km reaching. The coordination with the clients platform when reducing or increasing the bandwidth of a channel. Policing for dropping traffic. Control Plane integration (G-MPLS? SDN?)
- 12. Backbone Efficiency - Discussions OTN switching is still the best option combined to the ROADM to provide flexibility and reliability in the network. Fast protection given by the electrical layer and CAPEX savings provided by the OTN Switching + ROADM optical path restoration. Transport Network Keep On Evaluating Backbone efficiency Backbone efficiency OTN Switch + ROADM OTN Switch + ROADM ASON + WASON ASON + WASON Unified Control Plane allows max efficiency Unified Control Plane allows max efficiency Another approach proposed skipping the OTN Switching. Fast protection provided by the traffic routers and CAPEX savings by the ROADM optical path restoration. efficiencyefficiency + ROADM+ ROADM WASONWASON max efficiencymax efficiency Backbone efficiency Backbone efficiency Router + ROADM Router + ROADM GMPLS + WASON GMPLS + WASON Integrated Control Plane is mandatory (???) Integrated Control Plane is mandatory (???)
- 13. Backbone Efficiency - Discussions Transport Network Keep On Evaluating OTNOTN CPCP ROADMROADM The fast protection and electrical restoration are brought into the routers. They need to enlarge OTN switch/interfaces are cut off replaced by some few less on the routers The transport control plane comes up to the routers The sub lambda switching has also to be brought to the routers. They need to enlarge some more
- 14. Backbone Efficiency - Discussions Transport Network Keep On Evaluating OTN x Router The fast protection and electrical restoration are brought into the routers. They need to enlarge 2 x 1 The FRR is not that efficient when addressing too high amounts of traffic. The intended SLA may not be reached. OTN switch/interfaces are cut off replaced by some few less on the routers 1 x 2 The relation between the amount of interfaces must be very well evaluated. The cost of them on each platform is quite different. The transport control plane comes up to the routers 1 x 0 GMPLS runs trhough the routers and ROADM. Not many options of ROADM/Routers integrated. Multivendor environment issue. The sub lambda switching has also to be brought to the routers. They need to enlarge some more 1 x 2 Depending on the bandwidth usage per lambda. Keep in mind the cost difference between the options. 5 x 5
- 15. Backbone Efficiency – Discussions Longer distances = less availability. The nodes placed for availability improvement should be also routers. Cost increasing. Transport Network Keep On Evaluating Router OTN Traffic termination For availability improvement Longer distances = Less availability OTN x Router 5+ x 5
- 16. Backbone Efficiency – Discussions Legacy interfaces/services. How to address them? Routers don’t address efficiently SDH TDM interfaces. To keep the SDH based transport network in parallel become too costly. Transport Network Keep On Evaluating OTN x Router 5++ x 5 parallel become too costly. Fact The legacy is always a big issue for the operators/service providers. Provide a seamless optimized in cost solution to address the future and the present has a enormous value.
- 17. Backbone Efficiency – Discussions More than 80% of the service providers intend to deploy OTN Switching network until 2016. Mostly on the core. Transport Network Keep On Evaluating OTN x Router 5++ x 5 OTN Switch + ROADM ASON + WASON Unified Control Plane allows max efficiency Router + ROADM GMPLS + WASON Integrated Control Plane is mandatory (???) 2016. Mostly on the core. The OTN Switching integrated to DWDM/ROADM system is a major requirement up to 2016. Operators/Service Providers The OTN advantages are clear for wider area networks with longer links. Router solution makes sense for about 20% of the service providers. Everyone should make his own evaluation based on his environment/scenarios.
- 18. Unified Control Plane – New Trends SDN – Soft Defined Network Transport Network Keep On Evaluating Capacity all layers Capacity all layers DWDMDWDM 40G/100G40G/100G Coherent improves the network performance Coherent improves the network performanceBackbone Traffic interestService Platform ControlPlane layerslayers Access Aggregation efficiency Access Aggregation efficiency PTNPTN MPLS-TPMPLS-TP TDM support and OAM tools are keys SynchEth and 15588v2 TDM support and OAM tools are keys SynchEth and 15588v2 network performancenetwork performance Backbone efficiency Backbone efficiency OTN Switch + ROADM OTN Switch + ROADM ASON + WASON ASON + WASON Unified Control Plane allows max efficiency Unified Control Plane allows max efficiency Access Access Backhaul Aggregation Backbone Transport 2G/3G Backhaul DSLAM Backhaul MSAN Backhaul Traffic concentration Traffic connection Local Metropolitan Nation wide SDN ControlPlane
- 19. Centralized Data Center Unified Control Plane – New Trends SDN – Soft Defined Network Transport Network Keep On Evaluating Backbone Traffic interestService Platform ControlPlane DCN Access Transport Access Backhaul Aggregation Backbone 2G/3G Backhaul DSLAM Backhaul MSAN Backhaul Traffic concentration Traffic connection Local Metropolitan Nation wide SDN ControlPlane
- 20. Unified Control Plane – New Trends SDN – Soft Defined Network Transport Network Keep On Evaluating SDN Control Plane Forwarding Protection SDN API SDN CONTROL LAYER DCN Transport Protection Dynamic Routing Static Routing End to end dynamic provisioning Restoration Monitoring Mapping de-mapping QoS Policing QoS Handling . C P DWDM Switch OTN Any Device
- 21. Forwarding Protection Unified Control Plane – New Trends SDN – Soft Defined Network Typical Transmission Networks already have centralized control plane – NMS Transport Network Keep On Evaluating Forwarding Protection Transport Devices Basic Functions Protection Static Routing End to end dynamic provisioning Monitoring Mapping de-mapping QoS Policing . Protection Dynamic Routing Static Routing End to end dynamic provisioning Restoration Monitoring Mapping de-mapping QoS Policing QoS Handling .
- 22. Unified Control Plane – New Trends SDN – Soft Defined Network Despite the many challenges to be faced by SDN, it comes with a good rational and appeal for cost reduction on both OPEX and CAPEX. The network elements trend to be much simpler and focused on lower OSI layers: Lower CAPEX. The software APIs come to simplify the job for service delivering, Transport Network Keep On Evaluating The software APIs come to simplify the job for service delivering, speeding it up and automatizing steps: Lower OPEX. GMPLS can be a useful tool for the SDN approach in certain phases/scenarios. Anyway the GMPLS health is getting weak. GMPLS is still a requirement for the transport network platforms. SDN approach is becoming also a requirement, at least as a roadmap.
- 23. Access/Aggregation Efficiency – Discussions SDN (Soft Defined Network) and NFV (Network Functions Virtualization) impacts. Transport Network Keep On Evaluating Capacity all layers Capacity all layers DWDMDWDM 40G/100G40G/100G Coherent improves the network performance Coherent improves the network performancelayerslayers Access Aggregation efficiency Access Aggregation efficiency PTNPTN MPLS-TPMPLS-TP TDM support and OAM tools are keys SynchEth and 15588v2 TDM support and OAM tools are keys SynchEth and 15588v2 network performancenetwork performance Backbone efficiency Backbone efficiency OTN Switch + ROADM OTN Switch + ROADM ASON + WASON ASON + WASON Unified Control Plane allows max efficiency Unified Control Plane allows max efficiency
- 24. Access/Aggregation Efficiency – Discussions NFV (Network Functions Virtualization) Many of functions performed by dedicated appliances are brought into servers as virtual functions. These appliances are mostly based on Routers. Only the transport function is left spread in the network. Transport Network Keep On Evaluating Transport Devices Transport Devices Transport Devices Transport Devices Transport Devices Transport Devices NFV Structure DPI CDN Firewall NAT BRAS EPC Software Servers Switches
- 25. Access/Aggregation Efficiency – Discussions NFV (Network Functions Virtualization) Brings a quite big potential for cost reduction in the networks. The advanced requirements/protocols for transport devices are even fewer. Transport Network Keep On Evaluating Transport Devices Transport Devices Transport Devices Transport Devices Transport Devices Transport Devices NFV Structure DPI CDN Firewall NAT BRAS EPC Software Servers Switches
- 26. Access/Aggregation Efficiency – Discussions SDN + NFV as trends rising up in the market empower the approach of simpler and lower layer technology for the access and aggregation layers of the network. The MPLS-TP based devices with static routing are leveraged as one of the best options to support the transport in SDN and/or NFV approach. Transport Network Keep On Evaluating Ok for the evolving Capacity all layers Capacity all layers DWDMDWDM 40G/100G40G/100G Access Aggregation efficiency Access Aggregation efficiency PTNPTN MPLS-TPMPLS-TP TDM support and OAM tools are keys SynchEth and 15588v2 TDM support and OAM tools are keys SynchEth and 15588v2 Coherent improves the network performance Coherent improves the network performance Backbone efficiency Backbone efficiency OTN Switch + ROADM OTN Switch + ROADM ASON + WASON ASON + WASON Unified Control Plane allows max efficiency Unified Control Plane allows max efficiency Ok for the evolving trends of SDN and NFV
- 27. Conclusions OTN Switching has been consolidated as the technology option for the backbone layer for best efficiency combined to the DWDM ROADM. Control plane integration to the ROADM is becoming a mandatory requirement. SDN is raising up in the market as the unified and centralized multilayer control plane option. Within the SDN time for evolving and consolidation GMPLS continues as a mandatory requirement. Transport Network Keep On Evaluating GMPLS continues as a mandatory requirement. The approach of simplified equipment/protocols deployed along the transport network has been empowered by the SDN and/or NFV. The more complex functions trend to be centralized and even virtualized. Is time to start the proof of concept of SDN and NFV in order to start shaping the network for the future. Will they be the new disruption in the Operator/Service Provider networks??
- 28. Transport Network Thank you!Thank you! José Alves dos Santos Junior Oi Telemar - Brazil +55 21 3131 7773 jalves@oi.net.br José Alves dos Santos Junior Oi Telemar - Brazil +55 21 3131 7773 jalves@oi.net.br