802.11n – The New Edge NetworkAccess in a post-switching world<br />Matt Johnson, Technical Solutions Director, West Area<...
Meru Networks Company Overview<br />Founded in 2002, Sunnyvale, CA, USA <br />Operations in North America, APAC, EMEA<br /...
The Network Edge Design TodayOptimized for Cubicles and Desktops<br />The Wiring Closet<br />The Office<br />AGGREGATION S...
Mobility is THE Default Today’s edge networks were NOT designed for this!<br /><ul><li>Devices with NO Ethernet Port surpa...
Enterprise IT must adapt!</li></ul>Smart Devices Grow 4x<br />Source: Rohit Mehra - IDC<br />
Today’s Edge Is Dead!Network access is predominantly mobile!<br />The New Wiring Closet<br />The New Office<br />AGGREGATI...
The New Edge is Untethered<br />Mobile<br />Dense<br />Diverse<br />
The New Edge is Multi-Media<br />Video<br />Voice<br />Data<br />
The New Edge is Distributed<br />Campus<br />Branch<br />Telecommuter<br />
What makes wireless for the Edge possible?ANSWER: 802.11n<br />Definition<br />“IEEE 802.11n-2009 is an amendment to the I...
Wireless connection speed nears wired speed<br />
Promise of 802.11n<br />Better coverage<br />Higher throughput<br />Improved coverage through multipath and MIMO; multiple...
Multiple-In, Multiple-Out<br />Converts multipath into an advantage<br />Does the “impossible”: two transmissions at the s...
How Does 802.11n Work? Multiple Input Multiple Output<br />Radio<br />Radio<br />MIMO<br />Multiple “chains” per radio<br ...
Advanced RF separates the streams and doubles       throughput</li></li></ul><li>How Does 802.11n Work? Channel Bonding an...
Multiple packets in one shot: Block ACKs</li></ul>More Efficient<br />A-MPDU<br />D<br />D<br />D<br />D<br />D<br />D<br ...
<ul><li>Note:</li></ul>(Fundamental to 802.11n: the weakest link dominates)<br />More Range and Robustness<br />11abg Rang...
Different Ranges for Different Clients on the same AP</li></ul>Distance<br />
2x2, 3x2, 2x3, 3x3, …<br />What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNu...
What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br...
What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br...
2x2, 3x2, 2x3, 3x3, …<br />What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNu...
Why Meru for 802.11n<br />Meru was founded to solve common RF issues in order to allow coexistence of Voice, Video, and hi...
Let’s review the problems with WiFi today<br />Problem #1 – Most wireless access points perform like old wired Ethernet hu...
Fundamental Problem number 1: APs are hubs<br />Active Users Per AP<br />>100<br />11<br />Baseband + Protocol Overhead<br...
While transmitting sender cannot listen for collisions
As number of calls goes up, collisions increase
Collisions cause clients to back off
Back off slows down network</li></li></ul><li>Frisky client: ping-pongs between APs<br />Fundamental Problem #2: WLAN Clie...
This leads to…..<br />Lower than expected client counts per AP<br />Sticky clients<br />Clients that ping pong between APs...
Solution to the Problems:Meru Air Traffic Control<br />Patented control mechanism that times user transmissions resulting ...
Solution to the Problems:Virtualization of users<br />Multiple access points appear as one<br />One channel<br />One BSSID...
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802.11n Technology - Presented by Meru Networks and DTC

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This is the Webinar DTC and Meru Networks hosted on 8/25.

Discussed is 802.11n technology and How Meru Networks addresses of the problems seen in the market with other Wireless Network providers.

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  • The diagram represents what networks are architected for today – “Put in a switching architecture that provision 2 to 4 ports per user”. This leads to vastly overbuilt networks.Networks architected today we designed over 20 years ago when workers were only accessing applications with personal computers (PCs) and they worked only at their desks. IT departments designed their architectures and operations for this scenario and became very very optimized for the cubicle world.Main Points on this slide:Duplication of edge services complicates management (WLAN and LAN) and provides inconsistent QoS (Impactsproductivity)Port Density issues (Over-paying for extra, unused ports)Integration for emerging clients and applications difficult/complicated (QoS, wireless, etc.) (Not Future Proof)Must implement QoS services if voice, video, data planned on switched infrastructure (Over-build for corner case)Moves, Adds, Changes VERY expensive with wired POE ports (Cost)Before and after. Before: Many laptops and wires; After: Edge tomorrow – No wires/desktopsIts over!
  • World is accelerating from Desktop/Laptop to Tablet and smartphoneKiller app is VideoEdge is getting distributed (therefore you need it from core to edge service layout)It existed in wired - exists in the new edgeThe ability of the user to effectively use wireless and move around with their work has completely changed this paradigm. No longer is work confined to cubicles and offices but anywhere a device has access. This has driven the world toward Cloud (ubiquitous applications) and virtualization (for scalability). But the access network was never optimized for this scenario.In fact, in 2011, devices without an Ethernet port will exceed device with one THIS YEAR. Network users’ mode of operation has truly changed.
  • Networks architected today we designed over 20 years ago when workers were only accessing applications with personal computers (PCs) and they worked only at their desks. IT departments designed their architectures and operations for this scenario and became very very optimized for the cubicle world.Main Points on this slide:Duplication of edge services complicates management (WLAN and LAN) and provides inconsistent QoS (Impactsproductivity)Port Density issues (Over-paying for extra, unused ports)Integration for emerging clients and applications difficult/complicated (QoS, wireless, etc.) (Not Future Proof)Must implement QoS services if voice, video, data planned on switched infrastructure (Over-build for corner case)Moves, Adds, Changes VERY expensive with wired POE ports (Cost)Before and after. Before: Many laptops and wires; After: Edge tomorrow – No wires/desktopsIts over!Put the size of the video streams – what is the impact of this video on the network itself? Bandwidth, etc… Bullet on wireless video surveillance cameras into here if you can (it’s a big deal).Video distribution is becoming cheaper faster than any other technology in a long long while and its adoption is rising as fast or faster than wireless causing even more to be required of the edge network. The network that IT is putting out there needs to be optimized for a new mobile world where the mode of operation is video communication and mobile smart clients.TIM– wireless surveillance
  • From HQ to home office – the devices accessing and the experience expected is the same.
  • 802.11n Technology - Presented by Meru Networks and DTC

    1. 1. 802.11n – The New Edge NetworkAccess in a post-switching world<br />Matt Johnson, Technical Solutions Director, West Area<br />
    2. 2. Meru Networks Company Overview<br />Founded in 2002, Sunnyvale, CA, USA <br />Operations in North America, APAC, EMEA<br />NASDAQ Listed – “MERU”<br />Mission: Deliver Wireless-like-Wire™ experience to the enterprise <br />Virtualized Wireless LAN innovation<br />5,000+ customers in 55 countries worldwide<br />Category Leadership<br />Enterprise 802.11n solutions pioneer<br />Wireless VoIP, Video/HD video<br />Converged applications at scale<br />Device and user density, seamless mobility, QOS<br />Fixed Mobile Convergence<br />Enterprise WLAN service assurance<br />
    3. 3. The Network Edge Design TodayOptimized for Cubicles and Desktops<br />The Wiring Closet<br />The Office<br />AGGREGATION Services<br />CORE Services<br />
    4. 4. Mobility is THE Default Today’s edge networks were NOT designed for this!<br /><ul><li>Devices with NO Ethernet Port surpass those with Ethernet ports in 2011
    5. 5. Enterprise IT must adapt!</li></ul>Smart Devices Grow 4x<br />Source: Rohit Mehra - IDC<br />
    6. 6. Today’s Edge Is Dead!Network access is predominantly mobile!<br />The New Wiring Closet<br />The New Office<br />AGGREGATION Services<br />CORE Services<br />
    7. 7. The New Edge is Untethered<br />Mobile<br />Dense<br />Diverse<br />
    8. 8. The New Edge is Multi-Media<br />Video<br />Voice<br />Data<br />
    9. 9. The New Edge is Distributed<br />Campus<br />Branch<br />Telecommuter<br />
    10. 10. What makes wireless for the Edge possible?ANSWER: 802.11n<br />Definition<br />“IEEE 802.11n-2009 is an amendment to the IEEE 802.11-2007 wireless networking standard to improve network throughput over the two previous standards—802.11a and 802.11g—with a significant increase in the maximum raw data rate from 54 Mbit/s to 600 Mbit/s with the use of four spatial streams at a channel width of 40 MHz.”<br />Source: www.wikipedia.org<br />
    11. 11. Wireless connection speed nears wired speed<br />
    12. 12. Promise of 802.11n<br />Better coverage<br />Higher throughput<br />Improved coverage through multipath and MIMO; multiple transmit and receive paths<br />Over 6 times better than 802.11a/g *<br />Longer range<br />More reliable<br />Longer range: Over 2 times better than 802.11a/g *<br />More resistant to interference and loss due to multipath *<br />* Based on specifications in the standard.<br />
    13. 13. Multiple-In, Multiple-Out<br />Converts multipath into an advantage<br />Does the “impossible”: two transmissions at the same time<br />More Efficient Radio (PHY)<br />More OFDM carriers per stream<br />Faster coding rate per stream<br />Highest rate: 65Mbps; Lowest rate: 6.5Mbps<br />More Efficient MAC<br />Packet Aggregation<br />Bursting<br />Newer sleep modes<br />Double-wide Channels available<br />a<br />b<br />g<br />n<br />802.11n = 6x Throughput; 2x Range<br />
    14. 14. How Does 802.11n Work? Multiple Input Multiple Output<br />Radio<br />Radio<br />MIMO<br />Multiple “chains” per radio<br />Doubles Throughput<br />Radio<br /><ul><li>Multiple “spatial streams” at the same time
    15. 15. Advanced RF separates the streams and doubles throughput</li></li></ul><li>How Does 802.11n Work? Channel Bonding and Packet Aggregation<br />40MHz Channels<br />Adjacent channels “bonded” into one<br />Doubles Throughput (again)<br /><ul><li>Packet Aggregation
    16. 16. Multiple packets in one shot: Block ACKs</li></ul>More Efficient<br />A-MPDU<br />D<br />D<br />D<br />D<br />D<br />D<br />Block ACK<br />A<br />A<br />A<br />A<br />A<br />A<br />
    17. 17. <ul><li>Note:</li></ul>(Fundamental to 802.11n: the weakest link dominates)<br />More Range and Robustness<br />11abg Range<br />11n Range<br />Range Extension<br />More SNR  Better Robustness  Better Range<br />Throughput<br /><ul><li>Thus,
    18. 18. Different Ranges for Different Clients on the same AP</li></ul>Distance<br />
    19. 19. 2x2, 3x2, 2x3, 3x3, …<br />What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br />Number of Spatial Streams = 3 or less, always<br />3x_  _x3<br />3 Tx Antennas<br />3 Rx Antennas<br />
    20. 20. What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br />Number of Spatial Streams = 3 or less, always<br />2x2, 3x2, 2x3, 3x3, …<br />3x_  _x2<br />3 Tx Antennas<br />2 Rx Antennas<br />
    21. 21. What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br />Number of Spatial Streams = 3 or less, always<br />2x2, 3x2, 2x3, 3x3, …<br />2x_  _x3<br />2 Tx Antennas<br />3 Rx Antennas<br />
    22. 22. 2x2, 3x2, 2x3, 3x3, …<br />What does this mean?<br />Number of Chains = Number of Antennas used at any one time<br />NotNumber of Spatial Streams!<br />Number of Spatial Streams = 2 or less, always<br />2x_  _x2<br />2 Tx Antennas<br />2 Rx Antennas<br />
    23. 23. Why Meru for 802.11n<br />Meru was founded to solve common RF issues in order to allow coexistence of Voice, Video, and high volume of Data users across an 802.11 Network.<br />
    24. 24. Let’s review the problems with WiFi today<br />Problem #1 – Most wireless access points perform like old wired Ethernet hubs.<br />Problem #2 – Wireless devices make connection and roaming decisions.<br />
    25. 25. Fundamental Problem number 1: APs are hubs<br />Active Users Per AP<br />>100<br />11<br />Baseband + Protocol Overhead<br />8<br />5X<br />Total Bandwidth at Peak <br />(Mbps)<br />5<br />Contention<br />Loss<br />Today’s APPerformance<br />20-25<br />Today<br />Meru<br />20<br />1<br />3<br />Number of Active Users<br /><ul><li>Multiple clients contend for the same shared medium
    26. 26. While transmitting sender cannot listen for collisions
    27. 27. As number of calls goes up, collisions increase
    28. 28. Collisions cause clients to back off
    29. 29. Back off slows down network</li></li></ul><li>Frisky client: ping-pongs between APs<br />Fundamental Problem #2: WLAN Client makes decision<br />Client-initiated roaming<br />Clients must scan each channel for strongest signal<br />Connectivity depends on each client’s implementation of roaming algorithms <br />Risk of dropped calls, interrupted data sessions<br />Searching for signal wastes power, reduces battery life<br />Client has no knowledge of each AP’s load, may overburden one AP while another is free<br />Client may enter “dead zone” with no coverage at all<br />Sticky client:<br />remains connected to AP even when coverage is good<br />
    30. 30. This leads to…..<br />Lower than expected client counts per AP<br />Sticky clients<br />Clients that ping pong between APs<br />Dropped sessions when clients move around<br />Unequal distribution of client on APs<br />No fairness among users that are connected<br />Lack of QOS for real-time applications like voice<br />Interference among APs<br />Difficulty in trouble shooting issues<br />
    31. 31. Solution to the Problems:Meru Air Traffic Control<br />Patented control mechanism that times user transmissions resulting in:<br />Little to no contention loss so many more users possible<br />Fairness for all users even without QOS settings<br />Cleaner RF<br />APs coordinate activities:<br />No co-channel interference<br />Load balancing<br />No ping ponging<br />Seamless Roaming<br />A network of APs – Not islands<br />
    32. 32. Solution to the Problems:Virtualization of users<br />Multiple access points appear as one<br />One channel<br />One BSSID<br />Handoff eliminated<br />Network controlled<br />Connections load-balanced across APs<br />Network uses its awareness of traffic conditions to route packets over the air<br />Virtual Cell<br />Access Point<br />Access Point<br />Access Point<br />
    33. 33. Meru Virtualized WLAN DifferentiationVirtualize + Optimize the RF Resources<br />Legacy<br />Meru<br />Pooling<br />Virtualized<br />Microcell<br /><ul><li>Single channel – adding new AP’s simple as installing a light bulb
    34. 34. Harness every MHz everywhere
    35. 35. Seamless mobility</li></ul>Partitioning<br />Switch<br />Hub<br /><ul><li>Dedicated connection per device
    36. 36. Network guarantees each device its fair share of the air
    37. 37. Quality of service per application type</li></li></ul><li>Meru AP Performance<br />Meru: Wireless LAN VirtualizationVirtual Port™<br />Microcell functions as hub<br />Peak Aggregate Throughput <br />11<br />Baseband + Protocol Overhead<br />8<br />5<br />Total Bandwidth at Peak<br />(Mbps)<br />Contention<br />Loss<br />802.11 MACPerformance<br />1<br />20-25<br />3<br />Meru delivers switch-like predictability and performance<br />Number of Active Users<br /> Predictable throughput<br />Supports more clients<br />‘Wire like’ predictability<br />High quality Voice and Video<br />Delivers greater throughput<br />
    38. 38. Because of Air Traffic ControlTraffic Separation<br />Voice: Highest QoS, Admission Control<br />Video: Second QoS, Rate Limited<br />Application-Aware<br />Flow Detection<br />Data: Best Effort, Airtime Fairness<br />
    39. 39. CH 1<br />CH 11<br />CH 6<br />CH 1<br />Design Considerations<br />Lack of Site Planning Tools<br />Channel Planning Challenges <br />Migration of infrastructure from .11a/g to .11n<br />Two Different channel plans for 2.4 and 5 GHz using same AP chassis<br />Increase in interference with Increase in range <br />Power over Ethernet <br />"Site surveys will be of marginal use in 802.11n environments”<br />- Ken Dulaney, VP Distinguished Analyst, Gartner<br />30<br />
    40. 40. Summary of Meru Advantages<br />Predictable and reliable performance for all users<br />Fairness among all wireless devices<br />Highest density of users per radio vs other vendors<br />A wireless network that supports multimedia<br />Wireless network free of co-channel interference<br />Network is in control of the wireless client (seamless roaming)<br />Simplicity of design and ease of implementation<br />Advanced Troubleshooting tools<br />Better ROI and less OpEX<br />
    41. 41. Thank you<br />

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