fam’s teleco news (Año3-Nº7/Octubre 2012) 1/9 Noticias TIC Octubre 2012Indice:1.- RFoG Meets DOCSIS 3.1.2.- SingleSON Solution from Huawei.3.- DOCSIS 3.1: Here’s To The Next New Thing In Broadband!4.- Feds Fail To Hit Self-Designated IPv6 Deadline.5.- Telecom Italia to Launch LTE Services on 7 November.6.- Claro invertirá cerca de US$ 500 millones en Chile durante 2013.7.- Worlds First Commercial Satellite LTE Network.8.- Japan Airlines Brings JAL Sky Wi-Fi to Passengers.9.- 2nd-Generation Ultra-Broadband E-Band Microwave from Huawei.10.- Ericsson as supplier for 4G/LTE network in Brazil.11.- Artículos Tech Note de redes de transporte.12.- Fondo de Desarrollo de las Telecomunicaciones expone a la industria de telecomunicaciones de los futuros proyectos concursables y subsidiados.13.- ZTE Unveils Industry’s First TWDM-PON (NG-PON2) Prototype.14.- How to address WAN jitter issues for real-time applications.15.- Próximos Eventos:1.- RFoG Meets DOCSIS 3.1.ORLANDO — Traditional thinking in cable has been that when it comes to fiber-to-the-home (FTTH)architectures, radio frequency over glass (RFoG) is a transition technology leading to the eventualmigration to Ethernet passive optical networks (EPON). New DOCSIS 3.1 features combined with next-generation RFoG enhancements are challenging this assumption, according to panelists speaking at theSCTE Cable-Tec Expo yesterday.Bill Dawson, vice president of business development and product strategy for ARRIS Access, Transport &Supplies, noted DOCSIS 3.1 eventually will support downstream rates of 10 Gbps and upstream capacityof 2.5 Gbps.“When we combine advances with DOCSIS 3.1 and RFoG, they will ultimately offer capacity andperformance equal to or better than EPON or GPON,” Dawson said. “It’s much more cable-friendly andevolutionary. It’s forklift-free to get to higher capacity and higher service levels.” He urged cable operatorsto consider seriously RFoG both as their short-term and long-term roadmaps for FTTH.Donald Gall, CTO at Pulse Broadband, noted RFoG offers several benefits compared to traditional HFCnetworks. These include single-mode fiber-optic cable with more bandwidth, distributed tap architecturethat supports drops in excess of 1,000 feet, no CLI testing needed, and direct feeds with no activedevices between the headend/hub and customers.
fam’s teleco news (Año3-Nº7/Octubre 2012) 2/9The architecture is especially cost-effective for greenfield deployments and in less densely populatedareas like rural settings. Gall noted Pulse currently is building a RFoG network for an electric cooperative.“The network has two to 10 homes passed per mile,” he said. “We can build a RFoG plant for that atreally reasonable costs.”Gall added that the crossover point for greenfield deployments of RFoG versus 1 GHz HFC generally isbetween 75 and 100 homes per mile. Once an operator reached critical mass of homes passed, HFCbecomes more cost-effective, mainly due to the cost of the network interface unit (NUI). “Without the NIU,this is way cheaper than anything you can do with HFC,” Gall added. “If you’re doing an upgrade withoutreplacing the coax, then that will be cheaper. But you have to allow for the fact that the HFC is 15 yearsold.”When considering the costs of switching to a RFoG architecture versus relying on your HFC plant goingforward, Zoran Maricevic, senior director/Solution Architectures and Strategy at ARRIS Group Inc., saidit’s essential to keep in mind high-bandwidth-consumption growth rates. Maricevic noted that, historically,compound annual growth rates of bandwidth consumption is about 50 percent a year. His financialanalysis showed that a system with 1 million homes passes and with 2000 service groups of 500 homeseach, will need to be segmented to accommodate demand in 4.1 years. Furthermore, additionalsegmentation will be required every 1.7 years after that. This segmentation requirement translates to acost of roughly $50 for every home passed per year, or a net present value of roughly $315.83 milliondollars in 10 years.De: Communications Technology Volver Índice2.- SingleSON Solution from Huawei.Huawei, launched its innovative SingleSON solution in front of an audience of global operators at the Self-Organizing Networks (SON) Summit 2012, which ran from October 3 to 4 in Cannes, France. Utilizingreal-time network optimization and cross-system synergy routines, Huawei’s SingleSON solution helpsoperators enhance operations, maintenance efficiency, and network performance while ensuring userexperience.The SON Summit, held annually for the last three years, is the only industry forum dedicated to SONtechnologies. This year’s summit attracted more than 120 senior managers from world-renownedoperators, analysis institutions, international organizations, and telecom equipment manufacturers. Theprogram consisted of presentations and in-depth discussions concerning the development of SON.Data services are rapidly increasing in the MBB era, resulting in the emergence of multi-mode and multi-layer networks. Operators are now faced with the challenge of how to optimize network performancefaster to better meet growing end user requirements.Following the first proposal of Huawei’s SingleSON concept at the 2010 SON Summit, Huawei furtherelaborated upon the architecture of the solution at this year’s summit. Utilizing a newly introduced multi-
fam’s teleco news (Año3-Nº7/Octubre 2012) 3/9system co-processing unit eCoordinator, the SingleSON solution provides single- and multi-mode networkresource collaboration. Instead of optimizing future network growth with old data, Huawei’s eCoordinatormonitors network performance and status in real time, providing an analysis that achieves true automatedoptimization of multi-mode and multi-level networks. The eCoordinator provides operators with acomprehensive analysis of network resource usage, allocates radio resources more efficiently for eachuser, and offers the industry’s best optimized radio resource utilization and user experience.Ying Weimin, Huawei President for GSM&UMTS<E Wireless Networks, said: “Huawei SingleSON ismore than a concept, it’s a mature solution. In February 2012, SingleSON ANR was successfully put intocommercial use on an LTE commercial network in Cologne, Germany, as the world’s first deployment ofautomatic neighbor-cell configurations on a commercial network. In June 2012, the Validation aICICfunction was tested in Hong Kong, and was shown to be enable cell edge user data transfer rateenhancements of up to 30% on heavy load traffic networks. We believe that Huawei’s SingleSON solutionwill benefit more networks around the world in the future, helping global operators to achieve businesssuccess in the MBB era.”De: 4G-Portal.com Volver Índice3.- DOCSIS 3.1: Here’s To The Next New Thing In Broadband!Mark Palazzo, Vice President/General Manager of the Cable Access Business Unit, Cisco, at a specially-added session during the Society of Cable Telecommunications Engineers annual Cable-Tec Expo,another milestone was placed in the evolution of cable modems and broadband networks: The expansionof the specification, to eke even more bandwidth out of existing HFC plant.It’s called DOCSIS 3.1, and it’s a big deal. Every chapter in the DOCSIS specification added substantiallynew features – from 1.0 to 1.1 to 2.0 and, the latest workhorse for IP video, DOCSIS 3.0.DOCSIS 3.1 will take that even further. I’ll stop short of saying it’ll make the prior versions pale incomparison, but it’s not that much of a stretch. 3.1 brings a powerful combination: A new physical layerOrthogonal Frequency Division Multiplexing (OFDM) and additional forward error correction for lowdensity parity check (LDPC).Together, OFDM and LDPC can add as much as 50% more capacity in the upstream and downstreamsignal directions, while being backwards-compatible with the large installed base of earlier DOCSIS gear.For MSOs thinking about how to compete with all-fiber builds, or simply seeking ways to stay ahead of the45-50% CAGR in consumer broadband usage, it’s yet again a great arrow to have in the quiver.DOCSIS 3.1 is a milestone in the evolution of broadband. As a vendor company that helped to write thevery first DOCSIS spec (1.0), all the way through DOCSIS 3.1, we’re eager to help the cable industry toput it in motion.Here’s how we anticipate the DOCSIS 3.1 timing to unfold: By early 2013, completion of the PHY andMAC specs; silicon availability in 2014, and cable modem/CMTS availability in 2015.
fam’s teleco news (Año3-Nº7/Octubre 2012) 4/9If that seems a long time, it’s not, in terms how to efficiently stay ahead of consumer usage and demand.Interim staging towards 3.1, like deploying 24x8 cable modems, will serve as stepping stones along theway.DE: Communications Technology Volver Índice4.- Feds Fail To Hit Self-Designated IPv6 Deadline.Fewer than 20 percent of U.S. government agencies managed to meet a Sept. 30 deadline that had beenset for them to activate IPv6 (Internet Protocol version 6) on all of their outward-facing servers.With the availability of names on the Internet rapidly running out, IPv6 is supposed to represent thesalvation of the Web. Two years ago, the Office of Management and Budget (OMB) ordered governmentagencies to take the lead in adopting IPv6, by now for all of their Web sites and with all internalapplications to be up and running under IPv6 by this time in 2014.Just what went wrong now is a matter of debate. Some claim difficulty in implementing the technology.Others, perhaps more politically motivated, blame Congress for failing to appropriate funds needed tomake the conversion, turning governmental IPv6 into an unfunded mandate. Tom Coffeen, the chief IPv6evangelist at Infoblox’ IPv6 Center of Excellence, has a different theory. He thinks government agenciesjust don’t see the need to make the move yet.“We see the lack of IPv6 adoption as a threat to business,” rather than as a threat to governmentagencies, he explains. As a business, “you have to be able to offer your online resources directly overIPv6” or risk facing competition that has done so. The danger, he says, is “running into performanceissues because they’re translating from IPv4.”He continues, “Is this compelling to a federal agency? I don’t know that it is.” After all, federal agenciesdon’t have competition. “What incentive does a federal agency have to make sure that its Web site isperforming equally well for a user coming from an IPv6 host or from an IPv4 host?”Put another way, there’s no carrot to entice agencies into making the transition, at least not now. And asfor a stick, there’s not one of those, either. The OMB mandate carries with it no legislated penalties foragencies that don’t comply with the deadline. “I think there’s a recognition by a lot of these agencies thatthe status quo for them isn’t that onerous.” The worst that might happen, Coffeen estimates, is that anagency might have to get a waiver to install a new non-IPv6 application.As for the unfunded mandate, Coffeen insists that “technically, it really isn’t that complicated” to transitionfrom the current IPv4 to IPv6 support. He points out that while some federal agencies have done nothingat all to transition, some not only have met the initial mandate, but already have complied with the 2014mandate for internal IPv6 applications support. Heading that list, he cites the Veteran’s Administration.
fam’s teleco news (Año3-Nº7/Octubre 2012) 5/9At least a half dozen other government agencies are also two years ahead of their brethren, according toa continually updated list maintained by the National Institute of Standards and Technology (NIST) (formore information, click here). The OMB has tried to meet its own 2014 mandate in advance. It has metthe 2012 mandate, but tests show a problem with its implementation of IPv6 on its e-mail server. In total,301 federal Web sites now have achieved the 2012 mandate, but 1,070 have not. Some 58 governmentmail servers and 170 DNS servers at various agencies are at the 2014 level, while 700 DNS servers and534 mail servers have yet to be converted.As for the network infrastructure needed to reach those government sites, Coffeen indicates the nation’scarriers are ready. He cites the IPv6 implementation at Comcast as being exemplary. “It’s not as if thegovernment agencies are waiting for the carrier networks to turn on IPv6. The major carriers saw thewriting on the wall quite a few years ago,” Coffeen says. “In general, the adoption of IPv6 among Tier Oneand Tier Two carriers is pretty good.”De: Communications TechnologyIndicado de Aotamiento IPv4: http://inetcore.com/project/ipv4ec/index_es.html Volver Índice5.- Telecom Italia to Launch LTE Services on 7 November.Network begins rollout in Rome, Milan, Turin and Naples. By the end of the year new LTE services will berolled out to more than 20 cities, and then to the rest of Italy.Telecom Italia is pressing ahead with mobile ultra-broadband and beginning to market new TIM servicesbased on LTE (Long Term Evolution) technology, offering data transmission at speeds of up to 100 Mbit/sfor downloads and 50 Mbit/s for uploads, and making mobile services and high-definition multimediacontent available.New USB modems and tablets equipped with LTE technology, bundled with special data packages, willgo on sale in four Italian cities from 7 November: Rome, Milan, Turin and Naples. By the end of the yearnew LTE network services will be available in more than 20 cities throughout the country, before graduallybeing rolled out to the rest of Italy, along with an increasingly enhanced portfolio of services.LTE technology offers download speeds that are between five and ten times faster than the 14.4 MbpsHSPA network, and more than twice as fast as 42 Mbps HSPA technology. TIM customers will benefitfrom performance and levels of service that will significantly enhance their web browsing experience, andoffer groundbreaking content such as HD video streaming on the move.De: 4G-Portal.com Volver Índice
fam’s teleco news (Año3-Nº7/Octubre 2012) 6/96.- Claro invertirá cerca de US$ 500 millones en Chile durante 2013.Así lo indicó Gerardo Muñoz, gerente general de la subsidiaria chilena Claro (América Móvil), al diariochileno La Tercera. El monto será similar a la inversión realizada en 2012, y se destinará principalmenteal desarrollo de infraestructura.“Tenemos planes importantes para la tecnología LTE, que vamos a estar implementando el año queentra. En Chile es cuidar nuestras plataformas actuales como es 2G y 3G, haciendo inversiones tambiénen las tecnologías del cable y en televisión digital”, precisó Muñoz.Consultado sobre la portabilidad numérica, el ejecutivo indicó que espera llegar a fin de año con unos100.000 clientes portados netos.De: TeleSemana.com Volver Índice7.- Worlds First Commercial Satellite LTE Network.Space Data Corp and Lemko have announced the successful deployment of the worlds first satellite-based commercial LTE network.The network was deployed in Atqasuk, Alaska and offers subscribers mobile broadband data speeds ofover 70Mbps. The LTE over satellite service is enabled by Lemkos patented DiMoWiNe (DistributedMobile Wireless Network) software.Lemkos DiMoWiNe is a virtualized core software program co-located at the eNodeB. By virtualizing thecore, all switching and routing in the network is moved to the networks edge, resulting in a LTE solutionwith greater latency tolerances and the ability to deliver mobile broadband over satellite. DiMoWiNereduces the networks signaling traffic and all backhaul is transported as an "over-the-top" IP application.Lemko says that this allows commercial carriers like Space Data to economically deploy LTE usingsatellite in areas where it was not practical or possible to connect cell towers with fiber. Most importantly,people in remote regions will now have high-speed access to the Internet.De: cellular-news.com Volver Índice8.- Japan Airlines Brings JAL Sky Wi-Fi to Passengers.Asian airlines are ramping up their in-flight connectivity efforts with the likes of Thai Airways, JapanAirlines and Singapore Airlines making significant announcements to equip their fleets with the latestsystems. Singapore Airlines recently announced a new deal with Inmarsat, and Thai Airways is alsolaunching new in-flight connectivity services this year.Japan Airlines (JAL) is another such airline that is looking to have an impact in this market. The companyannounced a deal with Panasonic Avionics in September 2011 to start bringing these services topassengers, using the manufacturer’s broadband Ku connectivity solution, eXConnect. The companylaunched the service JAL SKY Wi-Fi in July. JAL SKY Wi-Fi first became available on flights betweenTokyo (Narita) and New York (John F. Kennedy) on alternate days in mid-July this year, and then daily
fam’s teleco news (Año3-Nº7/Octubre 2012) 7/9from early August. JAL now plans to deliver the service on flights to and from Chicago, Los Angeles andJakarta by the end of October, and London, Paris and Frankfurt by next spring.JAL is equipping its Boeing 777s with the service, and it expects to expand services to the rest of its fleetgradually. The airline has around 160 aircraft and leases another 50 aircraft giving it a total fleet of around215.“Onboard Internet is gradually becoming a common in-flight amenity, with several airlines in the UnitedStates and Europe already providing this service. As the number of users of portable devices with Internetcapability such as laptops, Smartphones and tablet PCs increase sharply in recent years, it is an obviousvalue-add for passengers to be able to use their devices on board to access the internet. It is thus, indeeda competitive differentiator. The ROI is the increase in customer satisfaction in JAL,” Takahiko Ebata,assistant manager, product and service strategy, development for Japan Airlines told In-FlightConnectivity Insider.“Meeting the needs of our customers is extremely important to JAL. If this is the service that most of ourpassengers need and want, we want to be able to provide it for them.”Like most airlines, JAL had to consider what solution to use, and whether to wait for a Ka-band solution tohit the market. By going with Panasonic Avionics, the airline has great faith in the current technologyavailable. “We want to differentiate ourselves from our competitors and to provide our customers with highspeed Internet connection onboard as soon as possible. This is why we have chosen to work withPanasonic Avionics,” says Ebata. “We did also consider the Ka-band solution, but it isn’t a service thatcan be started immediately. We want to start offering this service as soon as possible, and so we chosethe Ku-band option.”The launch of such services is not without technical issues. Offering an efficient solution available to allpassengers was no easy task.“To be able to provide this service, there is a need to install an antenna and radome on the aircraft, andthis was initially a challenge. As there is a limit to the bandwidth of each aircraft, we wanted to ensure thespeed of the connection is not affected by the number of people using the service,” says Ebata.DE: Satellite TODAY.com Volver Índice9.- 2nd-Generation Ultra-Broadband E-Band Microwave from Huawei.Huawei, today unveiled its 2nd-generation E-Band microwave at the Layer 123 Packet Microwave &Backhaul Forum in London. RTN 380, the first of Huawei’s E-Band series, delivers carrier-class reliabilitywith an LTE-proof bandwidth of up to 2.5 Gbit/s.E-Band operates at extended band 71-76 GHz and 81-86 GHz. The 1st-generation E-Band system,primarily used for enterprise networks, uses simple modulation techniques (for example, QPSK), with atransport rate of only 1 Gbit/s on 1 GHz or wider channels. It also lacks carrier-class Ethernet featuresand reliability.
fam’s teleco news (Año3-Nº7/Octubre 2012) 8/9Huawei’s 2nd-generation ultra-broadband E-Band microwave, which features high spectral efficiency andcarrier-class reliability, is strategic for building next-generation mobile broadband networks. Huawei’s E-Band uses high-efficiency 64 QAM modulation to reach a transport rate of up to 2.5 Gbit/s (over 250 MHzchannels), which will be further improved to a fiber-like capacity of 10 Gbit/s or higher. This significantlyreduces bandwidth leasing costs. Huawei’s E-Band also offers a variety of carrier-class features,including Ethernet, packet clocks, bandwidth compression, and automatic bandwidth adjustment.Furthermore, it supports powerful network management functions.“Huawei’s innovation in the microwave field is driven by a customer-centric strategy. To enable smoothevolution to all-IP networks, Huawei has taken the lead in launching IP microwave. Huawei will continueto unveil innovative products in the LTE era, helping customers cope with the upcoming bandwidthpressure and dense deployment of base stations,” said Jack Wang, president of Huawei’s transportnetwork product line.DE: Huawei Press Release Volver Índice10.- Ericsson as supplier for 4G/LTE network in Brazil.Ericsson is selected as supplier for Vivo’s 4G/LTE network, which will feature Ericsson’s latest RBS 6000multi-standard radio base stations. This agreement strengthens Ericsson’s position as primary telecominfrastructure supplier for Vivo and marks Ericsson’s second 4G/LTE win in Brazil.LTE Market by Infrastructure, Devices and Network Operator Services 2012 – 2016 – check out thereport’s overview now!Eduardo Ricotta, Vice President of Ericsson Latin America and the Caribbean, says: “We are honored tobe chosen once again to cooperate with Vivo, supporting their network evolution and innovation. Thisdecision is a result of the positive experiences that the operator has had with the successfulimplementation of Ericsson’s GSM, WCDMA and HSPA technologies in the past. The evolution of mobilenetworks is a fundamental step toward the advent of the Networked Society in Brazil.”Under the terms of the agreement, Ericsson is also responsible for network implementation, includingnetwork rollout, design and support services.Ericsson has now signed 89 LTE/EPC contracts in 38 countries on five continents.DE: Ericsson press release Volver Índice11.- Artículos Tech Note de redes de transporte.Lowering TCO While Migrating To PICs (photonic integrated circuit), non-blocking OTN switch in theoptical transport multiplexer; There have been lab demonstrations of 8 QAM and 16 QAM opticalmodulation; next-generation PICS integrate the equivalent of more than 600 optical components on a pairof PICs to deliver 5 x 100G waves aggregated as a 500G super-channel….DE: Communications Technology
fam’s teleco news (Año3-Nº7/Octubre 2012) 9/9https://snt130.mail.live.com/default.aspx?id=64855#n=166889369&fid=f1d5cb40597747e8bdc25333b2ae0aca&mid=d9e72938-13d7-11e2-b6d5-00237de4a312&fv=1 Volver Índice12.- Fondo de Desarrollo de las Telecomunicaciones expone a la industria de telecomunicaciones de los futuros proyectos concursables y subsidiados.Esta Subsecretaría de Telecomunicaciones, a través de la División Gerencia del Fondo de Desarrollo delas Telecomunicaciones, realizará una exposición informativa a la industria de telecomunicaciones, de losfuturos proyectos que serán concursados y subsidiados por el Fondo de Desarrollo de lasTelecomunicaciones, a objeto de que puedan evaluar con mayor oportunidad, su participación en dichosconcursos. Estos proyectos son: • Wi-Fi a nivel Nacional. • Expansión de Servicios Telefonía Móvil e Internet a nivel Nacional. • Conectividad para la Región de Aysén. • Conectividad para la Región de Coquimbo. • Servicio Intermedio Región de Magallanes, Porvenir. • Servicio Intermedio Región de Magallanes, Puerto Williams.De esta manera se extiende la invitación a la Industria de Telecomunicaciones a participar de estaexposición, que se realizará el día Jueves 25 de octubre a las 15:30 hrs, en las Salas 1 y 2, del piso 5to,de Amunátegui N° 139.DE: Subtel Sala de Prensa Volver Índice13.- ZTE Unveils Industry’s First TWDM-PON (NG-PON2) Prototype.ZTE Corporation (“ZTE”) a leading global provider of telecommunication equipment, network solutionsand mobile devices, has unveiled the world’s first time and wavelength division multiplex passive opticalnetwork (TWDM-PON) prototype at Broadband World Forum 2012 (BBWF) in Amsterdam.ZTE also demonstrated a solution for building pay-as-you-grow, flexibly evolving, green broadbandnetworks involving GPON, XG-PON1, NG-PON2 and WDM-PtP by TWDM technology. Meanwhile ZTEconsiders it will be a good idea to deploy the FTTx network with GPON and XGPON1 in the next 5 years.Overlay other wavelengths by TWDM technology will be a good choice for the higher bandwidthrequirement in the future.In April 2012, the Full Service Access Network (FSAN) Group designated TWDM-PON as the maintechnology direction of NG-PON2, the next generation of PON (passive optical network)technology. Drawing on its deep understanding of network development and customer needs, as well as
fam’s teleco news (Año3-Nº7/Octubre 2012) 10/9its extensive experience in technology innovation, ZTE developed its first TWDM-PON prototype soonafter the standards direction was determined.The central-office equipment for the TWDM-PON prototype is the ZXA10 C300, ZTE’s industry-leadingunified access platform, adapted for next-generation PONs. The ZXA10 C300 enables the coexistenceand easy upgrading from one standard to another of GPON, XG-PON1, NG-PON2 and WDM-PtP on thesame platform. The terminals for the TWDM-PON prototype are advanced colourless optical networkunits (ONUs) with tunable receiver/ transmitter technology.“Operators need to be building broadband networks that can evolve flexibly,” said Bei Jinsong, director ofZTE Optical Access Networks. “Taking this approach, current networks that use GPON and XG-PON1technologies, including FTTP, FTTH, FTTdp, can meet network development requirements for the nextfive to ten years. Over that period, neither existing XG-PON1 nor the optical network infrastructure needsto be changed. Therefore the XGPON1 will be deployed inevitably in short coming years”“By overlaying XG-PONs with new wavelengths, the network can gradually upgrade to the bandwidth ofNG-PON2 as needed or enable open access based on wavelength paths,” Mr Bei added. “The conceptalso supports expanding through WDM-PtP to provide services such as backhaul, fronthaul,businessaccess etc. . As a result, it is able to help operators markedly reduce expenditure on network constructionand energy consumption, thus effectively protecting their investments.”As the leader in the optical access networks sector, ZTE is committed to promoting the development ofoptical access standards and the industry’s supply chain. Its cutting-edge technology innovations, productsolutions, efficient services and prompt project delivery have been widely recognized by customers.According to the “Market Share Spreadsheet 2Q12 FTTx, DSL, and CMTS (Units)” report, released bytelecoms industry analyst Ovum in August 2012, ZTE ranks No.1 for both overall shipments of central-office PON equipment and market share of ONTs/ONUs.DE: ZTE Press Center Volver Índice14.- How to address WAN jitter issues for real-time applications.Traditional WAN Optimization techniques don’t help much, so other solutions are needed.We continue to cover the broad topic of which of the various technologies – including those that are partof the Next-generation Enterprise WAN (NEW) architecture, like WAN Optimization, WANVirtualization and Network-as-a-Service, and other, older technologies as well – best address the differentissues impacting application performance over the WAN.Last time we covered those techniques that address the variable queuing congestion-based componentof WAN latency, also known as jitter, as it affects TCP-based interactive applications or other datatransfer applications. Today, we address the smaller number of techniques for dealing with jitter for real-time applications like VoIP or videoconferencing.
fam’s teleco news (Año3-Nº7/Octubre 2012) 11/9With TCP applications, high amounts of jitter cause applications to perform poorly, but at least they stillperform at the end of the day, however frustrating the slow performance may become. High jitter for areal-time application can make them unusable, as meaningful two-way communication becomesimpossible. Per last time, the size of buffers in the typical WAN router are between 100 and 200milliseconds, and congestion on the WAN can sometimes add 400 milliseconds or more, especially overlong distances. Real-time applications will almost always have jitter buffers to handle small to moderateamounts of jitter without the application users noticing, but these buffers are usually on the order of 60 to100 milliseconds in length, so jitter beyond 100 milliseconds can effectively ruin real-timecommunications, as those packets delivered so late are effectively lost.As noted last time, it is essential to implement QoS properly on your WAN to ensure that the performanceof your real-time and interactive applications arent hurt by use of limited last-mile bandwidth byyour own other applications. And you need to have sufficient bandwidth at each WAN link to support theapplication, of course. For VoIP, this is not usually an issue, but for videoconferencing it can be; high-definition video will typically require 1 to 1.5 Mbps of bandwidth, and not everyone has that muchupstream bandwidth available on their branch WAN links, or has it only if the video has strict priority overall other applications used, which is often not acceptable.The traditional solution to avoiding WAN jitter problems is to buy MPLS to connect all of your locationstogether and implement their QoS system. This expensive solution does solve the problem for domesticconnections, and if the MPLS provider offers connectivity to your overseas locations, it should work forthem as well. If your provider doesnt offer direct connectivity for your overseas locations, or yourenterprise budget cant afford it, however, then you need to find an alternative. And because MPLS is avery expensive solution that offers relatively little bandwidth for other, more bandwidth-intensiveapplications, even domestically its not an option for many enterprises.So what alternatives do you have? Unlike for other kinds of applications, if your WAN connectivity isInternet-based, rather than using MPLS or some other kind of single vendor private WAN, the options areactually somewhat limited. Network-as-a-Service and WAN Virtualization are pretty much the only choicesout there that address WAN jitter in a meaningful way. WAN Optimization appliance solutions, while theyprovide value in numerous other ways, really cannot do anything about high jitter caused by congestionon the WAN.As we saw last time, Network-as-a-Service can address congestion-based performance problems ininternational connections, particularly those across oceans. A Network-as-a-Service solution with adedicated core network and colocation-based Points of Presence (PoPs) close to end-user locationsaddresses the issue of peering point-based congestion that occurs frequently in the Internet by bypassingthe public Internet altogether as the means of connecting the PoPs, and thus delivering stable, low-jitterconnectivity between locations across the globe. If you have good last-mile connections to your providers
fam’s teleco news (Año3-Nº7/Octubre 2012) 12/9PoPs, it can be a great solution to congestion-based latency in the Internet "middle mile," at a fraction ofthe cost of MPLS.The other alternative, WAN Virtualization, addresses congestion-based jitter directly as it occurs. WANVirtualization continuously measures one-way latency across all of the possible paths between any twolocations, and when it detects significant jitter on a path, it will quickly move traffic off that path onto abetter-performing path, limiting use of the now slower congested path only to applications, like filetransfers, that consume bandwidth but are not otherwise sensitive to higher latency. Some WANVirtualization solutions can even replicate real-time application traffic between locations across multiplepaths, eliminating any effects of high jitter or packet loss, and delivering "platinum" quality voice evenwhen using Internet connections which are exhibiting large amounts of congestion-based packet loss andhigh amounts of jitter. WAN Virtualization can be used to augment or replace MPLS connectivity, andcould be the way for some enterprises to afford sufficient bandwidth to be able to deploy next-generationapplications, VoIP and videoconferencing on a single converged enterprise WANDE: By Andy Gottlieb, NetworkWorld.com Volver Índice15.- Próximos Eventos: th* OCT 05th-09 , ITU TELECOM WORLD 2009 , GENEVE, SWITZERLAND th* OCT 13th-16 , FUTURECOM ,SAO PAULO, BRAZIL* OCT 09th-13th , USTAS TELECOM , LAS VEGAS, USA rd* OCT 21th-23 , MOBILE INTERNET WORLD ,BOSTON, USA* Oct 24-25, The Second Latin American Spectrum Conference , Mexico DF th* NOV 15th-19 , 3G WORLD CONGRESS , HONG KONG, CHINA th* NOV 27th-28 , SMART GRID CONFERENCE 2012 , LONDON, UK, EUROPE th* NOV 11th-12 , GSM AFRICACOM , CAPE TOWN, SOUTH AFRICA th* DEC 0th-08 , CTIA IT & ENTERTAINMENT ,BUDAPEST, HUNGARY Volver Índicefam / Octubre de 2012http://cl.linkedin.com/in/famapablazaSerán bienvenidos sus comentarios a: email@example.comPresentaciones Técnicas disponibles para consulta y Noticias de mesesprevios en:http://www.slideshare.net/fapablaza Debe estar registrado comousuario. COMPARTA CON SUS COLABORADORES Y COLEGAS