Evolving the metro network for the 100G services era. Application note. 1 Application note Evolving the metro network for the 100G services era

Transcription

1 Evolving the metro network for the 100G services era Application note 1 Application note

2 Abstract To efficiently address increasing 100G service demands, many metro optical networks will soon need to evolve from 10G optimized transport to 100G+ optimized transport. This paper discusses approaches and corresponding Nokia optical network solutions that can be used to upgrade metro networks for the 100G services era. 2 Application note

3 Contents Introduction 4 Metro optical networks today 4 New requirements for metro networks 4 Impact on metro networks 5 100G services era evolution strategies 6 Nokia optical networks metro solutions PSS-8/16 pay-as-you-grow flexibility 8 Universal 100G card 9 Summary 10 Acronyms 11 3 Application note

4 Introduction Metro networks are encountering a major transformation as services and private networks move to the cloud, while end-user access speeds increase as they are driven by technologies such as 4G and 5G. In the past, due to their relatively compact topologies of < 600 km, abundance of optical fiber and the requirement to interconnect network elements at 10G rates or less, metro networks could rely on a 10G optimized optical transport infrastructure. This situation is about to change dramatically as 10G service demands continue and 100G service demands accelerate to usher in a 100G services era. Metro optical networks today Most metro networks were put in place well before the cloud network architecture materialized. Today, most metro networks are optimized for 10G dense wavelength division multiplexing (DWDM) rates with static wavelength connectivity. In many cases, the ability to perform traditional Synchronous Digital Hierarchy/Synchronous Optical Network (SDH/SONET) service aggregation is still required by many metro networks, even though packetbased services are quickly replacing these legacy services. New requirements for metro networks The 100G rate is rapidly moving from a transport core infrastructure rate to a service rate as end-user services speeds increase and data centers move to metro geographies to get content closer to end users. These factors are pushing metro optical networks to evolve from 10G optimized transport to 100G+ optimized transport. The resulting metro bandwidth increase is also propelling metro interconnecting long-haul networks to evolve from 100G transport to 200G transport. However, 10G and sub-10g services will continue to be a significant source of revenue for many network operators. Hence, there also must be a smooth and flexible evolution path for existing services to be carried over higher capacity transport. Figure 1. Metro optical networks are entering the 100G services era 100G services era Metro 100G Long haul 200G 10G 100G Data center Access Optical network 4 Application note

5 Impact on metro networks As metro networks move to support the 100G services era, advances in the following optical networking areas should be taken into consideration to create the most scalable, efficient and flexible network. Efficient 100G metro wavelengths for sub-100g services Metro networks that support large quantities of sub-100g services will need a new level of flexible optical transport network (OTN) switching scale to evolve to 100G optimized metro networks. For many metro environments, this new scale level is ideally delivered through compact pay-as-you-grow metro optimized platforms that continue to support existing services over a variety of deployment applications including: Directly multiplexing 1G 40G service interfaces onto 100G wavelengths Optimally filling 100G wavelengths leveraging existing equipment that uses pay-as-you-grow packet/otn switching Reliable add-drop multiplexer (ADM) functionality that efficiently utilizes bandwidth by grooming low rate services into protected 100G metro rings 100G service flexibility Metro networks will require native 100G service flexibility to complement the sub-100g service aggregation in the form of: Flexible transponders/muxponders to support both 100G services and sub-100g services Secure encrypted 100G transport wavelengths Path to increased 100G service client port density over higher capacity 200G+ transport wavelengths Better wavelength modulation algorithms Nokia introduced single carrier 200G wavelengths for the metro/regional environment with the introduction of the 16QAM 200G modulation capable cards in Nokia also recently introduced higher capacity and/ or longer reach wavelengths such as the Nokia Photonic Service Engine 2 - Super Coherent (PSE-2s) 8QAM 200G long haul and nx250g superchannel wavelengths. Taking advantage of these new formats requires an evolution from fixed grid optical networking to flexgrid optical networking. Many metro networks currently have sufficient fiber capacity such that 100G+ wavelengths are not yet required, which allows them to expand using dense, lower cost 100G wavelengths. The top priority for these networks is to efficiently fill 100G wavelengths without impacting existing sub-100g services. However, a future evolution path that leverages near-term investments while also being able to seamlessly advance to faster 200G+ line rates is required. 5 Application note

6 Multilayer capable metro optimized platforms If one type of equipment can support multiple combinations of the aforementioned functions, it can also allow network operators to reduce operating expenses (OPEX) through purchasing and sparing fewer types of equipment. If this equipment can be flexibly placed in metro environments that demand small equipment footprint, low power consumption and the option for extended temperature operation together with wavelength selective switch/reconfigurable optical add-drop multiplexer (WSS/ROADM) photonic components, further OPEX savings can be realized through a converged Ethernet, OTN and wavelength routing multilayer operation. Figure G services era metro requirements 100G services era metro requirements Compact platforms optimized for 100G+ transport Low power consumption Highly integrated line card and switching Flexible client options Wavelength encryption options One card flexible deployment options Transponder Muxponder Uplink Transponder 100G services era evolution strategies There are fundamentally two approaches for evolving 10G optimized optical networks to the 100G services era. 10G and 100G+ wavelength coexistence This approach leaves the existing 10G metro transport wavelengths in place while new higher capacity 100G+ transport wavelengths are added to the networks. The benefit of this approach is that it takes advantage of existing network infrastructure including 50 GHz-based ROADMs. The disadvantages include: Guard band between 10G and 100G+ wavelengths leading to wasted capacity on fiber routes Potential for complex ROADM sites, especially with respect to adding and dropping services at a network site Dispersion compensation modules (DCMs) are required. DCMs increase network operations complexity and capital expenditures (CAPEX). Services also transition through more fiber leading to higher latency service-level agreement (SLA) values. 6 Application note

7 In many cases, a coexistence approach only delays the need to evolve to an all-coherent metro network. Evolution to an all-coherent metro network This approach removes 10G wavelengths from the metro by having them multiplexed into 100G+ coherent transport wavelengths. The result is a fully coherent metro network for all existing and new wavelengths. At first, this approach may look more expensive when compared to a coexistence approach because it requires additional 100G+ muxponder cards to create a fully coherent network. However, modern muxponder cards such as the new Nokia Universal 100G card and 500G muxponder card offer the 10G and 100G client port density and transport wavelength and deployment flexibility to make the investment toward an all-coherent metro network much more attractive, especially when combined with the other advantages of coherent networks: Guard band between 10G and 100G+ wavelengths is not required; this leads to more capacity on fiber routes. 100G+ wavelengths deliver more than 10+ times the capacity than 10G wavelengths using much less spectrum. Coherent wavelengths are better suited to CDC-F (colorless, directionless, contentionless with FlexGrid) architectures which provide enhanced programmability and resiliency. Plus, with all-coherent wavelengths there is no need to deploy complex ROADM architectures required for the simultaneous add/drop of coherent and 10G direct detect wavelengths. DCMs can be eliminated from the network, which reduces network OPEX complexity and CAPEX. Services also transition through less fiber leading to lower service latency and differentiated SLAs. Simplified amplifiers can be used, leading to more compact ROADM cards. Equipment based on modern coherent technology leads to more service scale per wavelength to deliver lower cost per transport bit. For many networks these factors contribute to a rapid payback toward an all-coherent metro investment. Nokia optical networks metro solutions The Nokia optical networks metro optimized portfolio is designed to efficiently evolve metro networks to the 100G services era no matter where a metro network is starting. At the foundations are: Compact, high client port density PSE-2 digital signal processor-based muxponders 7 Application note

8 Flexible and compact Nokia 1830 PSS-4/8/16 metro optimized chassis options to address any metro deployment environment, including support for multilayer and extended temperature range operation In particular, the unique combination of the 1830 PSS-8/16 and the new Universal 100G card offer the ultimate deployment flexibility to evolve any metro network to the 100G services era using either a coexistence or fully coherent evolution approach PSS-8/16 pay-as-you-grow flexibility The 1830 PSS-8/16 metro optimized platforms utilize an innovative distributed switching architecture in compact 3 RU/8 RU footprints. The architecture is based on an open backplane design for flexible slot-to-slot switching that allows adding switching capacity for any mix of packet, OTN or photonic services as needed in a pay-as-you-grow method for low initial first cost. Operators only need to pay for the capacity and switching needed. Distributed, or fabric-less, switching is ideal for metro aggregation of sub- 10G and 10G traffic to 100G+ transport wavelengths. It is suitable for small node aggregation applications and hybrid configurations with photonics and switching in the same shelf. Figure 3. Nokia 1830 PSS-8/16 metro deployment flexibility 3 RU 8 RU 1830 PSS PSS-16 Flexible combinations Packet services delivery Traditional services delivery Carrier Ethernet networking Flexible packet/otn switching Multi-degree wavelength routing This pay-as-you-grow versatility has led to a new generation of flexible Nokia muxponder/transponder cards which can either operate on their own and/or communicate with other cards in the shelf through the distributed switching. This new level of flexibility allows: Existing cards to be leveraged as new cards are added to capture new revenue opportunities Existing cards to take advantage of new cards that offer faster transport wavelength rates Support for efficient multiservice and multilayer deployment options The result is a compact, metro optimized platform that has the flexibility to efficiently address mobile/fixed backhaul, data center interconnect (DCI), optical virtual private network (VPN), SDH/SONET migration and enterprise Carrier Ethernet and wavelength services. 8 Application note

9 Universal 100G card The Nokia 1830 PSS Universal 100G card supports transponder, muxponder, uplink and ADM deployment applications for 10G, 40G and 100G client services. The card reduces network operator costs by eliminating the need to engineer, order, stock and spare different card types for each service type or optical rate. All client ports feature pluggable optics, so only the client ports and services provisioned need to be populated. Powered by the newest generation of Nokia Photonic Service Engine 2 Compact (PSE-2c) 100G optimized digital single processor and Transport Switching Engine (TSE) packet/otn switching silicon, it delivers the ultimate combination of deployment flexibility, performance, port density and low power consumption by: Reducing costs and simplifying network operations with a single card for all 10G, 40G and 100G service rates for traditional SDH/SONET, Ethernet and wavelength services Having the flexibility for CFP4 or QSFP28 100G client pluggables Integrating OTN switching with 1G granularity for efficient grooming of services onto a 100G coherent, fully C-band tunable, wavelength division multiplexing (WDM) network port for both fixed (50 GHz) and flexgrid deployments Supporting industry-leading client port density and packet/otn grooming flexibility Being hardware ready for 100G line encryption Supporting 100G transponder, muxponder, uplink and ADM options to efficiently support the evolution of existing and new services to the 100G services era Figure 4. Universal 100G card flexible deployment option benefits Client Line Client Other cards OTN Line 100G transponder Dual line card and client protection options 100G uplink Groom traffic from existing cards Dual line card protection options Any mode benefits 100G PSE-2c low power consumption Encrypted line options One spare card for many applications Client Line Client Line 100G muxponder Flexible integrated 10G and 40G ports Dual line card and client protection options 100G ADM Efficient capacity utilization by grooming low rate services into protected 100G rings 9 Application note

10 This ultra flexible and efficient card can be placed in the 1830 PSS-8/16 metro optimized platforms. It takes full advantage of the pay-as-you-grow 1830 PSS-8/16 distributed switching fabric to leverage existing card investments through uplink and/or ADM deployment flexibility. It can deliver 200 Gb/s of client services aggregation over 2x100G lines while only using 2 card slots, allowing the 1830 PSS-8/16 to surpass the capacity offered by larger products with centralized switching architectures. The 1830 PSS Universal 100G card can also be placed in the 1830 PSS-32 platform for dense metro and/or long-haul muxponder and transponder deployments. Figure 5. Universal 100G card ultra flexible interfaces Universal 100G card 8 x SFP+ 10 GigE/OTU2/SDH-64/OC-192 clients 1830 PSS-8 1 x QSFP+ 40 GigE/OTU3 client 1 x CFP4 100 GigE/OTU4 client 1 x QSFP GigE/OTU4 client or 1 x QSFP+ 40 GigE/OTU3 client 1830 PSS-16 1 x 100G fixed grid/flexgrid line port fully tunable across the extended C-band 2 x SFP+ 10 GigE/OTU2/SDH-64 OC-192 clients 1830 PSS-32 Summary Metro optical networks need to prepare for the 100G services era. Nokia optical networks have produced unique and industry-leading optical networking technology advancements into metro optimized network solutions that can support the 100G services era and beyond. Whatever your current metro networking technology or architecture may be, Nokia metro optimized solutions have the unique foundational technologies to evolve it to a more scalable, efficient and flexible network that minimizes network total cost of ownership (TCO) and maximizes service revenue potential. 10 Application note

11 Acronyms ADM CAPEX CD/CDC-F DCI DCM DWDM OPEX OTN PSE-2s PSS QAM QSFP ROADM RU SDH SLA SONET TCO TSE VPN WDM WSS add-drop multiplexer capital expenditures colorless, directionless/colorless, directionless, contentionless with FlexGrid channel support data center interconnect dispersion compensation module dense wavelength division multiplexing operating expense optical transport network Photonic Service Engine 2 Super Coherent Photonic Service Switch quadrature amplitude modulation quad small form-factor pluggable reconfigurable optical add-drop multiplexer rack unit Synchronous Digital Hierarchy service-level agreement Synchronous Optical Network total cost of ownership Transport Switching Engine virtual private network wavelength division multiplexing wavelength selective switch Nokia is a registered trademark of Nokia Corporation. Other product and company names mentioned herein may be trademarks or trade names of their respective owners. Nokia Oyj Karaportti 3 FI Espoo Finland Tel (0) Product code: SR EN (October) Nokia 2016 nokia.com