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WHITE PAPERCOLLISION-FREERESIDENTIALACCESSCAMBIUM’S POINT-TO-MULTIPOINT WIRELESS BROADBANDNETWORKS USE MULTIPLE TECHNOLOGI...
The customer is always right. No business knows that better than                           • • • • • • • • • • • • • • • •...
RESIDENTIAL BROADBAND OPTIONSThe most basic decision residential service providers must                                   ...
SAMPLE NETWORK COMPARISON: OUTDOOR WAN RESIDENTIAL ACCESS                                                                 ...
LATENCY, JITTER AND                                                                                               INTERFER...
A VIEW TO THE FUTURE                                                                        USE CASESIn most cases, reside...
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Sp residential 0125121

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  1. 1. WHITE PAPERCOLLISION-FREERESIDENTIALACCESSCAMBIUM’S POINT-TO-MULTIPOINT WIRELESS BROADBANDNETWORKS USE MULTIPLE TECHNOLOGIES TO DELIVER HIGHTHROUGHPUT, RELIABILITY AND SCALABILITY.
  2. 2. The customer is always right. No business knows that better than • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • communications service providers offering wireless broadband Internet access to residential communities. The pressure is constantly on them to deliver wireless service that’s clear, consistently fast and available 24/7. Whenever there are network issues, customers make their dissatisfaction known loud and clear. And they’re not afraid to play their ultimate card and change service providers. In the highly competitive wireless communications market, dissatisfied customers can and do change providers virtually as soon as they have a poor service experience. How do some service providers keep their customers consistently satisfied – and satisfied so much that they recommend the service provider to their friends and neighbors? These service providers plan and deploy high-speed wireless networks with proven technology that’s able to give their customers exactly what they want. They deploy networks delivering broadband connectivity that allows customers to enjoy high-speed and low latency voice, data and video service with high availability and a minimum of interference and outages. Of course, they also have to take care of their own business cases. They seek out network solutions that allow them to provide this exemplary service with a high-degree of cost-effectiveness; they must choose a platform that minimizes both capital and operating expenses. Last, but far from least, successful service providers must choose a network solution that enables them to grow their subscriber base and revenues. Deploying a network with the ability to scale elegantly enables service providers to easily add new customers without adversely affecting quality of service for existing customers.SOLUTION PAPER COLLISION-FREE RESIDENTIAL ACCESS 2
  3. 3. RESIDENTIAL BROADBAND OPTIONSThe most basic decision residential service providers must • RELIABILITY. PMP residential access networks havemake is which type of network technology to deploy. The an exceptionally low outage rate that leads to minimalchoices basically come down to two. Recently there has customer complaints and increased customer satisfac-been a lot of discussion centered on utilizing 802.11-based tion. Operating expenses are mostly incurred in growingnetworks, especially the new 802.11n technology. But is the network. Networks using contention-based systemsthis contention-based solution the best option for outdoor face increased operating expenses – tech support,wireless broadband residential access networks? troubleshooting, maintenance truck rolls – from customerCambium’s Point-to-Multipoint (PMP) wireless networks service complaints caused by network reliability issues.are a proven solution that is already serving millions ofresidential customers around the world. • SCALABILITY. PMP technology enables service providers to deploy, expand and extend their networksBoth options offer reasonable solutions, but there are major more efficiently with the ability to serve hundreds of “ e grew more Wdifferences between the two that can affect customer subscribers from each access point. Contention-based and more dissatisfiedservice and therefore customer satisfaction and business systems, on the other hand, are optimized for indoor with the performancesuccess. These differences fall into four main performance hot spots and normally only able to serve a few dozen of our initial network.categories: subscribers per access point. About three years• CONSISTENCY. PMP residential access networks ago, we made the COLLISION VS. SYNCHRONIZATION are proven to deliver consistent and predictable decision to replace coverage, bandwidth, latency and performance. How do the 802.11 and PMP technologies differ? 802.11 our existing Contention-based systems are generally not optimized networks are based on solutions initially developed for indoor, noise free environments. This indoor WiFi infrastructure for outdoor usage and tend to provide less consistent technology is not adapted to handle the increase in (with the Cambium coverage which may lead to an increased number of service calls and maintenance dispatches. noise levels caused by higher amounts of interference in PMP network.)” unlicensed outdoor environments. 802.11 networks are Stig Pettersen• CAPITAL EXPENSES. PMP networks are cost- contention-based solutions relying on unscheduled access. Co-Founder, TotalNett efficient to deploy, utilizing a relatively small number of This results in “collisions” in which signals must vie for Norway towers that can continue to be leveraged as the network access to channels, an issue that can lead to serious delays grows. Contention-based systems offer a relatively low and availability problems that can lead to an increasingly initial access point cost. However, as more customers dissatisfied customer base. The problem only gets worse are added to the network additional access points and as an 802.11 network gets larger with collisions occurring towers are required to expand the system. more and more frequently. PMP networks differ in their fundamental core THE CAMBIUM PMP DIFFERENCE: GPS SYNCHRONIZATION technology. PMP networks are not contention-based. Instead they provide • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ALL APS TRANSMIT AT THE SAME TIME scheduled access utilizing THIS REDUCES SELF INTERFERENCE AND ENABLES NETWORKS TO BE CO-LOCATED advanced GPS synchroniza- tion. Providing access in this manner removes the C A “collision” factor and allows B B PMP networks to scale up C A A C C A in a much more efficient and easier fashion to ALL SMS TRANSMIT B B B B AT THE SAME TIME support a higher number A C C A A C of Subscriber Modules. B B A CSOLUTION PAPER COLLISION-FREE RESIDENTIAL ACCESS 3
  4. 4. SAMPLE NETWORK COMPARISON: OUTDOOR WAN RESIDENTIAL ACCESS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • COMPETITIVE SYSTEM CAMBIUM PMP POOR COVERAGE IN AN UNSYNCHRONIZED DENSE PMP COVERAGE IN A SYNCHRONIZED DEPLOYMENT DUE TO HIGH INTERFERENCE LEVELS DENSE DEPLOYMENT – LARGE AREA OF GOOD COVERAGE WITH LITTLE SELF INTERFERENCEADVANCED GPS SYNCHRONIZATION CONSISTENT, PREDICTABLECambium PMP solutions use GPS synchronization. This THROUGHPUTcapability enables all the Access Point (AP) modules in the GPS-synchronized channel access enables Cambium PMPnetwork – whether there are hundreds or even thousands – networks to deliver exceptional aggregate throughput perto transmit at precisely the same time to Subscriber channel, providing the consistent performance residentialModules (SMs) and to receive at the same time from customers expect. Sure, at 3:00 a.m. traffic is scant andSMs. This network wide synchronization of APs and SMs virtually any type of system can handle the demandeliminates delay-causing traffic collisions and subsequent for bandwidth. What happens at 3:00 p.m., however, “The Cambiumretransmissions while preventing radio signals from when traffic surges? Collisions and disorderly channel product has not onlybleeding into the signals of other modules in the network, access cause performance degradation and delays that the best cost/which can cause signal degradation or disruption known customers can’t and won’t ignore. Unlike networks based performance ratioas self-interference. The ability to virtually eliminate on contention-based systems, maximum throughput of any product weself-interference allows the cost-efficient physical in Cambium PMP networks is available through peakco-location of network equipment along with the ability periods as demand increases. found on the market,to use multiple frequency overlays on existing towers we found it to be thethroughout the network. CO-LOCATION AND COVERAGE most stable and the most reliable.” Cambium PMP residential access networks’ GPSEFFICIENT FREQUENCY RE-USE synchronization capabilities help expand coverage and Phil WalshGPS synchronization enables efficient frequency reuse. eliminate coverage gaps. One solution for accomplishing Snap BroadbandThis capability provides superior cost-effectiveness for thorough coverage requires the ability to co-locateservice providers by allowing them to use the limited equipment on towers or sites. Co-location enables servicenumber of channels available within a frequency band to providers to install multiple access points either on theserve a higher number of subscribers as the network grows. same tower or on towers at distances ranging from acrossConversely, without GPS synchronization, contention-based the street to across the city. This is especially importantsystems tend to offer very poor spectrum reuse. 802.11 as the network grows and adds more subscribers. Fromnetwork expansion and increased throughput capacity a business case standpoint, fewer towers need to bebecome more difficult and more costly to incorporate. constructed or rented and fewer locations need toBottom line, service providers with contention-based monitored and maintained, which can significantly lowersystems need more and more spectrum in order to serve CAPEX and OPEX. The results are significant: moreadditional customers. throughput delivered to the coverage area, less chance of coverage gaps and more satisfied customers.SOLUTION PAPER COLLISION-FREE RESIDENTIAL ACCESS 4
  5. 5. LATENCY, JITTER AND INTERFERENCE MITIGATIONCUSTOMER SATISFACTION In outdoor wireless broadband residential access networksLatency can negatively impact residential customer there will be interference. How much it affects networksatisfaction. Latency measures the time needed for performance and customer usability depends largely onsignals to traverse the network. Jitter is a measure of the the network technology. As a wireless pioneer andvariability of latency. Both can interfere with performance innovator with decades of experience in outdoor wirelessand result in customer dissatisfaction. Caused in large communications, Cambium knows more about mitigatingpart by network congestion, latency is responsible for the effects of interference than virtually any otherannoying delays and interruptions in customer service, manufacturer. Cambium PMP networks are designed toleading to problems in applications such as VoIP service, optimize performance in interference-heavy unlicensedonline gaming and video. In contrast to the load-driven frequency spectrum. They utilize GPS synchronization toinconsistent latency of contention-based systems, which mitigate self interference, and many use the Cambium Airmay vary from 50 to 200 milliseconds at any given time, Interface Protocol to neutralize interference from externalCambium PMP networks deliver consistently lower, more sources such as ambient noise and signals from otherpredictable latency, typically five to seven milliseconds. emitters using the same frequency. Together these technol- ogies help ensure that the effects of interference will not adversely affect your network connectivity or performance, your end user satisfaction or your return on investment. OUTDOOR WIRELESS RESIDENTIAL ACCESS TECHNOLOGY COMPARISON Cambium PMP Contention-Based Systems Implications CAMBIUM PMP CONTENTION-BASED SYSTEMS IMPLICATIONS Scheduled Channel Access – Contention-based – prone to Without scheduled access,MEDIA ACCESS deterministic and scalable collisions on loaded systems. users will be dissatisfied regardless of load. with availability as more subscribers are added.• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Consistent and Inconsistent and Without consistent latency,LATENCY/QoS Deterministic – critical Unpredictable – increases network users will experience for voice and video and with load. delays and potentially poor T1 replacements. performance.• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Supported – provides Not Supported – resulting Unsynchronized systems efficient channel reuse and in inefficient channel re-use, perform inconsistently andGPS easy deployment in multi- interference susceptibility poorly as subscribers areSYNCHRONIZATION sector / multi-site systems. and difficult deployment. added. Use more channels to serve the same number of users.• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Higher aggregate real user Lower throughput for Low-density systems require throughput and system given channel width. Real more AP towers to be addedTHROUGHPUT capacity for given channel user throughput degenerates to meet demand, addingAND CAPACITY width and available spectrum. quickly with increasing interference and cost. Throughput is not impacted offered load. by load.• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Built for Outdoor – better Built for Indoor – less Poor technical performancenLOS resistance to interference resistance to interference. will create problems for and better links in nLOS network users, causing manyPERFORMANCE environments. to switch providers.SOLUTION PAPER COLLISION-FREE RESIDENTIAL ACCESS 5
  6. 6. A VIEW TO THE FUTURE USE CASESIn most cases, residential wireless service providers want What’s the most important factor in choosing a platform “Finally, after a greatto deploy networks that can grow quickly and easily, for an outdoor wireless broadband residential access deal of trial and error,increasing both profitability and business sustainability. network? Customer satisfaction. The question is will your we discovered theThis places a premium on scalability. With GPS synchroni- first 500 customers recommend your service to the nextzation, enhanced frequency reuse and co-location capabili- 5,000? And in a growth-oriented business, will that 5,000 Cambium PMP wirelessties, Cambium PMP residential access networks allow recommend your network to the next 10,000? The answer broadband solution.service providers to serve an expanding customer base depends on performance and reliability, of course. But if It’s been meetingmore successfully, more efficiently and more profitably. you’re intent on growing your business, it also depends reliability andCambium PMP networks generally require less initial heavily on elegant scalability with efficient channel reuse service requirementsequipment to provide desired coverage and capacity. and co-location capabilities to provide a lower Total Cost of in unlicensed spectrum Ownership (TCO).But initial deployment is literally only the beginning. for many years now…Cambium PMP networks also support significantly less In some use cases, residential access networks are able at price points that arecostly network growth by offering the ability to serve to leverage 802.11-based technologies. These are typically winning, and keeping,an increasing number of subscribers using the same smaller, less growth-oriented networks serving a limited high-value customers.”equipment. And new equipment can be added cost- number of subscribers in low-density, noise-free areas. Ineffectively without having to change existing coverage contrast, PMP is generally the optimum choice for service Todd Bergstromor channel plans. areas in which noise may adversely affect customer service CEO and satisfaction and for which network expansion is a vital 3-dB Networks business objective. ABOUT CAMBIUM NETWORKS Cambium Networks provides world-class wireless broadband and microwave solutions for military, government, municipal and enterprise customers around the world. It currently has more than 3.2 million products deployed in thousands of networks in over 150 countries, with its breakthrough technologies providing reliable, secure, cost-effective connectivity that’s easy to deploy and proven to deliver outstanding metrics. Cambium’s ecosystem of partners, development engineers, and support teams work together to design and deliver innovative, forward-looking solutions that provide data, voice and video connectivity when and where it’s needed. www.cambiumnetworks.comCambium Networks and the stylized circular logo are trademarks of Cambium Networks, Ltd. All other trademarks are the property of their respective owners.© Copyright 2012 Cambium Networks, Ltd. All rights reserved.

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