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Advanced RF Design & Troubleshooting

The document outlines principles for advanced RF design and troubleshooting by focusing on simplifying RF needs, ensuring efficient airtime usage, and enabling quick resolution of issues. Key objectives include reliable client connectivity, quick data processing, and seamless roaming between access points, underpinned by strong signal quality and proper capacity analysis for high-density environments. The presentation emphasizes the importance of thoughtful design practices to enhance wireless performance in various settings, such as auditoriums and large public venues.

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Advanced RF Design and Troubleshooting Ken Peredia and Clark Vitek March, 2014
CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved 2 #AirheadsConf Agenda Introduction Design Troubleshooting
3 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design and Troubleshooting • Our Goals: –RF needs to be simpler, • (not advanced or tremendous) –RF just has to work (Design) –If it doesn’t work we need to figure it out and fix it as quickly as possible (troubleshooting)
4 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Goals • Simplify RF, design for the best chance of success, enable quick troubleshooting of RF issues. • Presenter’s challenge: Find a common theme we can present in 90 minutes or less that will advance all these goals.
5 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Common Theme for RF Airtime
6 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF and Airtime • Design –Provide a stable RF environment that will minimize the use of airtime for every task • Troubleshooting –Use tools that provide airtime related information to find and fix RF problems
7 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF and Airtime • The concept of airtime is the tool that helps us understand advanced RF topics. • Basic RF (BRF) – Good “coverage” • Advanced RF (ARF) – Good SNR, good signal strength, + good Airtime! Advanced RF (ARF) = Airtime + RF
8 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design = Airtime + RF
9 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design • Advanced Design Objectives 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime 2. Once connected they can do whatever they want to do, whenever they want to do it… as quickly as possible, finish, and open the air for someone else 3. When they move they will roam seamlessly from one AP to another… with a minimum disruption to airtime
10 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime Let me on Let me on
11 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Basic – Acceptable Signal Strength and SNR in both directions – Association Capacity – Network connectivity and capacity (i.e. DHCP, Auth, etc.) • not really RF but often RF is blamed because symptoms are the same as not meeting above 2 requirements – Get devices connected to the BEST AP – Before, during and after connection process minimize impact of any inidividual client on available airtime – Secret Sauce: • Design network to limit responses and certain traffic from APs • Design rate controls for every stage of connection Advanced Basic vs. Advanced Connectivity
12 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced Connectivity • Step 1: Ensure Solid Coverage with Good SNR –Goal: Provide highest data rate coverage to all clients in the intended coverage area, • Regardless of whether applications expected require such rates • Higher Rate = Less Airtime for any task with a “Fixed Payload” • This includes ALMOST all kinds of traffic,
13 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf – Impact of Rates on Airtime is very significant at all stages of connectivity: pre-association, association, and connected – Example: Connected • Time required to download/upload 1 Mbyte •@6 Mbps = 1.3 secs •@36 Mbps = 0.22 secs • Users that can download/upload a 1 Mbyte page every 5 minutes • @6 Mbps = 230 • @36 Mbps = 1363 – Any single 802.11 channel can support an increase in page loads directly proportional to the client connection rate (6x in this example) Advanced Connectivity : Rates
14 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • To achieve High Data Rates requires strong signal strength and high SNR • Example: (from AP-220 series datasheet) Advanced Connectivity : Coverage Mode (20 MHz, 1ss – 3ss) Receive Sensitivity per chain (dBm) SNR (dB) (implied, -95 dBm NF) Legacy 802.11a/g 54 Mbps -75 20 802.11n HT20 MCS7/15 65 – 216 Mbps -71 24 802.11ac VHT20 87 – 289 Mbps -65 30
15 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • Common design practice of -65 dBm (~30 SNR) is adequate is many situations to achieve highest possible rates in all 20 MHz modes (legacy, 11n, and 11ac) • The corresponding throughput achieved is based on the “Channel Capacity” and may have to take into account an increased noise floor or co-channel/adjacent channel AP interference • BUT--- Wouldn’t it be a lot better if all clients were associated at 54 Mbps and higher instead of some at 54 and others at lower rates, i.e. down to 6 Mbps by default in legacy 802.11a? Advanced Connectivity : Coverage
16 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Guidance Aruba Networks produces a library of Validated Reference Designs The High Density (HD) WLANs VRD covers ultra high capacity spaces such as auditoriums, arenas, stadiums and convention centers The recommendations have been field proven at dozens of customers VRDs are free to download from Aruba Design Guides web page: http://www.arubanetworks.com/VRD
17 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Considerations – Common Space • Seating Capacity: The number of people in the space • Size: Physical size of space that needs coverage • Device count: Number of expected devices, may be more than seating capacity • Device Capability: 2.4 or 5 GHz, 802.11n MIMO, etc. • Device State: Sleep mode, Associated but idle, Actively sending/receiving data • Application Bandwidth: For Active devices, how much throughput is really needed?
18 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Steps: RF Coverage Step 1: Design RF Coverage to achieve High Rates Coverage should be designed for the highest data rates (i.e. 54 Mbps+). This requires strong signal coverage (-65 dBm) to be provided in all areas. Aruba VisualRF, or other predictive tools (Airmagnet, Ekahau) are all good tools for this stage of the design. Example: 288 seats, 1 AP covers almost entirely at -65 dBm. (green area)
19 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Determine Capacity required for both 2.4 GHz and 5 GHz a. Association Capacity – based on number of devices that will need to associate. Typically all devices that are expected in the environment will be included in this capacity requirement (laptops, phones, etc.). Association capacity is typically larger than seating count for auditoriums. b. Active Capacity – the number of devices expected to not be in sleep mode or “passive” association (associated but not sending/receiving data). c. Throughput Capacity – based on the expected applications, how much throughput is needed to be delivered both on wireless and wired uplinks. Design Steps: Capacity Analysis
20 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • As an example, we will use the 288 seat auditorium we saw previously needed one AP for -65 dBm coverage • The next step is to calculate the required association capacity • The assumptions shown on the following slides are based on a “classroom” type setup Step 2: Capacity Analysis
21 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Capacity Analysis 2a: Calculate Required Association Capacity Typically for this type of auditorium we will assume every user has 2 devices that will get used during the conference, i.e. a laptop and smartphone Association Capacity Required = 2 Devices x Seats = = 2 x 288 seats = 576 Devices We must also consider the frequency capability of the devices: Laptops: Typical 80% are 5 GHz capable Smartphone: Typical 30% are 5 GHz capable Net Result : 5 GHz: (288*0.8)+(288*0.3) = 316 devices on 5 GHz 2.4 GHz: (288*0.2)+(288*0.7) = 260 devices on 2.4 GHz Access points have a limit of 255 maximum associations per radio (2.4 or 5 GHz). Based on the above capacity analysis we see we will need at least 2 Access Points to meet the needed Association Capacity.
22 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Capacity Analysis (continued) 2b Active Device Capacity Analysis • Once the AP count to meet required association capacity is known, we need to check that AP count against the anticipated “Active User” needs • There are a variety of adjustments that can be made to estimate the ratio of “Active” users vs “Associated” • In this classroom example, typically user is one device active, with the second device is likely to be associated but not active or in sleeping mode. Therefore, 50% of devices would be typically assumed to be “Active” (i.e. sending/receiving data, not sleeping or idle) for this throughput analysis. • However, in a conference center it is not unusual at times for nearly all laptops to be active concurrently. • Therefore, for this active capacity analysis we will assume all laptops, but only 50% of smartphones are active at any time.
23 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Active Capacity Analysis Hall Associated Devices Active Laptops Active Smartphones Total 576 total 0% idle 50% idle 2.4 GHz 260 total =57 active (same as associated count) =101 active (50% of associated count) 5 GHz 316 total =230 active (same as associated count) =43 active (50% of associated count) Consider likely idle devices
24 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Active Device Analysis • After estimating the active device counts, the required capacity depends on what we want the clients to be able to do (bandwidth) • To start, we need to pick a target bandwidth. This is the number if all active clients ran speedtest at the same time, what minimum would we want them to see?
25 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Total Channel Capacity AP-125 * This point shows 40 active 802.11n HT20 clients can sustain > 1.2 Mbps each on a single ch TotalChannelCapacity 50 Mbps/40 = 1.25 Mbps 18 Mbps/20 = 0.9 Mbps 30 Mbps/20 = 1.5 Mbps
26 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Target Bandwidth per Client Max 40 per 5 GHz, 2ss laptops = 1.2 Mbps 2.4 GHz smartphone target max 20, ~1 Mbps
27 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Bandwidth Capacity Analysis Band Active Laptops Active Smartphones Total Active Devices Required Channels 2.4 GHz 57 101 158 =(158/20)=8 5 GHz 230 29 259 =(259/40)=7 The above channel counts provide the number of radios needed to maintain the target active client capacity (target bandwidth) per channel. Problem: Only 3 non-overlapping channels in 2.4 GHz!
28 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Step 3: Channel Reuse Analysis • There are 22 available non-overlapping channels in the 5 GHz frequency range. – Channel reuse in a single open space is not required in MANY situations – Recommendation: Deploy the needed number of APs possible based on the 5 GHz channel count. In the example 288 seat auditorium we could increase the per user available bandwidth on 5 GHz by deploying more APs up to the available channel count. (assuming no overlap from adjacent rooms) • There are only 3 available non-overlapping channels in the 2.4 GHz frequency range – Based on need for capacity of 7 Channels, channel reuse is suggested – Recommendation: Plan and deploy based on channel reuse 2-3 times per channel but consider reducing to no channel reuse if active clients on 2.4 GHz are fewer than predicted.
29 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example, 5 GHz Coverage 36 52 4060 44 64 48 56 -60 dBm -55 dBm -65 dBm 8 APs meets: -Coverage -Required Association Capacity -Required Active Device Capacity -No channel reuse
30 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example, 2.4 GHz Coverage 6 6 111 11 1 -55 dBm -60 dBm 6 of 8 APs active (vs. 3) Meets: -Coverage Requirement -Association Capacity -Active Device capacity not met based on design parameters in 2.4 GHz -Active device bandwidth capacity not met increased by channel reuse (requires rework of 2.4 GHz objectives)
31 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example #2 Large Public Venue (LPV)
32 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • Typical LPV example: – 20,000 Seat Indoor Arena: One large RF space • Design Goals (repeat) 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime 2. Once connected they can do whatever they want to do, whenever they want to do it… as quickly as possible, finish, and open the air for someone else 3. When they move they will roam seamlessly from one AP to another… with a minimum disruption to airtime Design Example #2 Large Public Venue (LPV)
33 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • LPV Design Process – Step 1: Provide solid coverage to every seat (-65 dBm in both 2.4 GHz and 5 GHz bands), even when crowd is present – Step 2: Capacity Analysis • Association Capacity • Active Device Capacity • Bandwidth Considerations Design Example #2 Large Public Venue (LPV)
34 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf LPV RF Coverage • Several Strategies available for providing good coverage • The following photos show some examples
35 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf “Under-Seat” Installation
36 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf “Under Concrete” Installation
37 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete Example
38 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Coverage Strategy – Overhead Narrow Beam Antennas
39 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Catwalk Installation Example
40 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Bowl Catwalk Strategy Example Catwalk Coverage
41 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Outer Catwalk Example Coverage: -65 dBm from 4 APsOuter Catwalk Coverage ANT-2x2-2314/5314
42 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Example Inner Catwalk Coverage ANT-2x2-2314/5314
43 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Stadium“30 Degree Sector” Antenna Comparison Other
44 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Stadium 30 degree Sector Antenna Comparison Other
45 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete: -50 dBm 45Aruba Confidential
46 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete: -55 dBm 46Aruba Confidential
47 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete : -60 dBm 47Aruba Confidential
48 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Capacity Analysis • For a large public venue, it is helpful to use manifest information to analyze association and active user capacity on a section by section basis
49 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 2013 Capacity Analysis Per AP Per AP Per AP Expected Associations Active Devices Associations Active Devices Estimated Uplink Area Seats APs 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total Average (Mbps) Section 118 734 5 138 46 184 69 23 92 28 10 38 14 5 18 0.490666667 Section 117 1366 9 257 86 343 129 43 172 29 10 39 14 5 19 0.508148148 Section 116 1066 7 200 67 267 100 34 134 29 10 39 14 5 19 0.508571429 Section 314 811 5 153 51 204 77 26 102 31 11 42 15 5 20 0.544 Section 321 1002 7 188 63 251 94 32 126 27 9 36 13 5 18 0.478095238 Section 110 378 3 71 24 95 36 12 48 24 8 32 12 4 16 0.422222222 • List Sections and seat counts, and APs planned per section • Estimate expected Associations and Active devices • Per AP Values – Assocations and Devices • Uplink Estimate – Based on Per Session Usage, 5 min average (2014 is about double now)
50 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 2013 Capacity Analysis • Typical per-user bandwidth required (average) is ~20 kbps even in environments where individual speedtests can support >50 Mbps! • How? Most Clients get on, get done quickly, get out of the way for the next guy.
51 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Example: Moda Center 3/5/2014 Client Session Summary Sessions: 32146 Unique clients: 4217 Unique APs: 289 Avg session duration: 11 mins Total traffic (MB): 94107.51 Avg traffic per session (MB): 2.93 Avg traffic per client (MB): 22.32 Avg bandwidth per client (Kbps): 26.75 Avg signal quality: 24.51 Airwave stats: ~20% of capacity (20,000 seats) 50-60% of this value typically concurrent Total Traffic 94 Gbytes Per session, Per user stats Total Traffic 94 Gbytes
52 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Configuration Best Practices
53 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Design Configuration • Goal: Maximizing available Airtime by Design – In previous section we designed for high rate coverage – Now, lets really take advantage of it! • Increase Beacon and Basic Rates – These rates are used for most types of management traffic including beacons, probe responses, association requests, etc. – In environments with lots of APs to meet high association capacity requirements it is critical to increase these rates as high as possible that will allow clients to still connect – Increasing these rates has side effect of encouraging clients to move to their “best AP” since they can not decode higher rate frames as they get farther away
54 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf • Increase data rates: Once a client is on an AP, require it to use a high rate to maximize available airtime. • Use 20 MHz channels in dense environments, or environments with mixes of clients. At present 4x VHT20 or HT20 channels appear to still provide more aggregate throughput than a single 80 MHz channel when there are a lot of clients and APs in range. • Increase max retries: Whenever channel reuse is happening, potential for collisions increases. Allowing more retries reduces drops. • Limit Probe Responses: In environments with lots of unassociated clients, probe responses can be a significant use of airtime. • Limit broadcast and multicast to known applications requiring these protocols Design Configuration
55 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Configuration – SSID Profile Items in italics are ArubaOS default
56 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Configuration – Other Profiles Items in italics are ArubaOS default
57 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Controller Troubleshooting
58 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf What could affect Airtime?
59 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Low Client Health
60 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Investigating Low Client Health
61 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Investigating Low Client Health
62 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf AP Neighbors
63 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems AP Client Table
64 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
65 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
66 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
67 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Airwave Troubleshooting
68 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Client Health Dashboard
69 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Low Client Health
70 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Low Signal Strength
71 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems RF Capacity
72 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems <1% Time Exceeded Threshold
73 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems AP with High Channel Utilization
74 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Utilization Revealed
75 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems How many RF Neighbors?
76 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Mobile Wi-Fi Tools
77 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Aruba Utilities – Handover Tab
78 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Aruba AirO – Easy Health Check
79 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Quick Internet Throughput Test
80 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Ping & DNS
81 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Ping & DNS
82 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Aruba Spectrum Analyzer
83 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Real Time FFT
84 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Real Time FFT
85 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Summary
86 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf 3rd Party Analysis
87 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Airmagnet Spectrum
88 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Questions?
89
90 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf
91 CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved #AirheadsConf Download Airheads Mobile
92 Thank You #AirheadsConf CONFIDENTIAL © Copyright 2014. Aruba Networks, Inc. All rights reserved

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Advanced RF Design & Troubleshooting

  • 1.
    Advanced RF Designand Troubleshooting Ken Peredia and Clark Vitek March, 2014
  • 2.
    CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved 2 #AirheadsConf Agenda Introduction Design Troubleshooting
  • 3.
    3 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design and Troubleshooting • Our Goals: –RF needs to be simpler, • (not advanced or tremendous) –RF just has to work (Design) –If it doesn’t work we need to figure it out and fix it as quickly as possible (troubleshooting)
  • 4.
    4 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Goals • Simplify RF, design for the best chance of success, enable quick troubleshooting of RF issues. • Presenter’s challenge: Find a common theme we can present in 90 minutes or less that will advance all these goals.
  • 5.
    5 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Common Theme for RF Airtime
  • 6.
    6 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF and Airtime • Design –Provide a stable RF environment that will minimize the use of airtime for every task • Troubleshooting –Use tools that provide airtime related information to find and fix RF problems
  • 7.
    7 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF and Airtime • The concept of airtime is the tool that helps us understand advanced RF topics. • Basic RF (BRF) – Good “coverage” • Advanced RF (ARF) – Good SNR, good signal strength, + good Airtime! Advanced RF (ARF) = Airtime + RF
  • 8.
    8 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design = Airtime + RF
  • 9.
    9 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design • Advanced Design Objectives 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime 2. Once connected they can do whatever they want to do, whenever they want to do it… as quickly as possible, finish, and open the air for someone else 3. When they move they will roam seamlessly from one AP to another… with a minimum disruption to airtime
  • 10.
    10 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced RF Design 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime Let me on Let me on
  • 11.
    11 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Basic – Acceptable Signal Strength and SNR in both directions – Association Capacity – Network connectivity and capacity (i.e. DHCP, Auth, etc.) • not really RF but often RF is blamed because symptoms are the same as not meeting above 2 requirements – Get devices connected to the BEST AP – Before, during and after connection process minimize impact of any inidividual client on available airtime – Secret Sauce: • Design network to limit responses and certain traffic from APs • Design rate controls for every stage of connection Advanced Basic vs. Advanced Connectivity
  • 12.
    12 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Advanced Connectivity • Step 1: Ensure Solid Coverage with Good SNR –Goal: Provide highest data rate coverage to all clients in the intended coverage area, • Regardless of whether applications expected require such rates • Higher Rate = Less Airtime for any task with a “Fixed Payload” • This includes ALMOST all kinds of traffic,
  • 13.
    13 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf – Impact of Rates on Airtime is very significant at all stages of connectivity: pre-association, association, and connected – Example: Connected • Time required to download/upload 1 Mbyte •@6 Mbps = 1.3 secs •@36 Mbps = 0.22 secs • Users that can download/upload a 1 Mbyte page every 5 minutes • @6 Mbps = 230 • @36 Mbps = 1363 – Any single 802.11 channel can support an increase in page loads directly proportional to the client connection rate (6x in this example) Advanced Connectivity : Rates
  • 14.
    14 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • To achieve High Data Rates requires strong signal strength and high SNR • Example: (from AP-220 series datasheet) Advanced Connectivity : Coverage Mode (20 MHz, 1ss – 3ss) Receive Sensitivity per chain (dBm) SNR (dB) (implied, -95 dBm NF) Legacy 802.11a/g 54 Mbps -75 20 802.11n HT20 MCS7/15 65 – 216 Mbps -71 24 802.11ac VHT20 87 – 289 Mbps -65 30
  • 15.
    15 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • Common design practice of -65 dBm (~30 SNR) is adequate is many situations to achieve highest possible rates in all 20 MHz modes (legacy, 11n, and 11ac) • The corresponding throughput achieved is based on the “Channel Capacity” and may have to take into account an increased noise floor or co-channel/adjacent channel AP interference • BUT--- Wouldn’t it be a lot better if all clients were associated at 54 Mbps and higher instead of some at 54 and others at lower rates, i.e. down to 6 Mbps by default in legacy 802.11a? Advanced Connectivity : Coverage
  • 16.
    16 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Guidance Aruba Networks produces a library of Validated Reference Designs The High Density (HD) WLANs VRD covers ultra high capacity spaces such as auditoriums, arenas, stadiums and convention centers The recommendations have been field proven at dozens of customers VRDs are free to download from Aruba Design Guides web page: http://www.arubanetworks.com/VRD
  • 17.
    17 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Considerations – Common Space • Seating Capacity: The number of people in the space • Size: Physical size of space that needs coverage • Device count: Number of expected devices, may be more than seating capacity • Device Capability: 2.4 or 5 GHz, 802.11n MIMO, etc. • Device State: Sleep mode, Associated but idle, Actively sending/receiving data • Application Bandwidth: For Active devices, how much throughput is really needed?
  • 18.
    18 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Steps: RF Coverage Step 1: Design RF Coverage to achieve High Rates Coverage should be designed for the highest data rates (i.e. 54 Mbps+). This requires strong signal coverage (-65 dBm) to be provided in all areas. Aruba VisualRF, or other predictive tools (Airmagnet, Ekahau) are all good tools for this stage of the design. Example: 288 seats, 1 AP covers almost entirely at -65 dBm. (green area)
  • 19.
    19 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Determine Capacity required for both 2.4 GHz and 5 GHz a. Association Capacity – based on number of devices that will need to associate. Typically all devices that are expected in the environment will be included in this capacity requirement (laptops, phones, etc.). Association capacity is typically larger than seating count for auditoriums. b. Active Capacity – the number of devices expected to not be in sleep mode or “passive” association (associated but not sending/receiving data). c. Throughput Capacity – based on the expected applications, how much throughput is needed to be delivered both on wireless and wired uplinks. Design Steps: Capacity Analysis
  • 20.
    20 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • As an example, we will use the 288 seat auditorium we saw previously needed one AP for -65 dBm coverage • The next step is to calculate the required association capacity • The assumptions shown on the following slides are based on a “classroom” type setup Step 2: Capacity Analysis
  • 21.
    21 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Capacity Analysis 2a: Calculate Required Association Capacity Typically for this type of auditorium we will assume every user has 2 devices that will get used during the conference, i.e. a laptop and smartphone Association Capacity Required = 2 Devices x Seats = = 2 x 288 seats = 576 Devices We must also consider the frequency capability of the devices: Laptops: Typical 80% are 5 GHz capable Smartphone: Typical 30% are 5 GHz capable Net Result : 5 GHz: (288*0.8)+(288*0.3) = 316 devices on 5 GHz 2.4 GHz: (288*0.2)+(288*0.7) = 260 devices on 2.4 GHz Access points have a limit of 255 maximum associations per radio (2.4 or 5 GHz). Based on the above capacity analysis we see we will need at least 2 Access Points to meet the needed Association Capacity.
  • 22.
    22 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Capacity Analysis (continued) 2b Active Device Capacity Analysis • Once the AP count to meet required association capacity is known, we need to check that AP count against the anticipated “Active User” needs • There are a variety of adjustments that can be made to estimate the ratio of “Active” users vs “Associated” • In this classroom example, typically user is one device active, with the second device is likely to be associated but not active or in sleeping mode. Therefore, 50% of devices would be typically assumed to be “Active” (i.e. sending/receiving data, not sleeping or idle) for this throughput analysis. • However, in a conference center it is not unusual at times for nearly all laptops to be active concurrently. • Therefore, for this active capacity analysis we will assume all laptops, but only 50% of smartphones are active at any time.
  • 23.
    23 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Active Capacity Analysis Hall Associated Devices Active Laptops Active Smartphones Total 576 total 0% idle 50% idle 2.4 GHz 260 total =57 active (same as associated count) =101 active (50% of associated count) 5 GHz 316 total =230 active (same as associated count) =43 active (50% of associated count) Consider likely idle devices
  • 24.
    24 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Active Device Analysis • After estimating the active device counts, the required capacity depends on what we want the clients to be able to do (bandwidth) • To start, we need to pick a target bandwidth. This is the number if all active clients ran speedtest at the same time, what minimum would we want them to see?
  • 25.
    25 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Total Channel Capacity AP-125 * This point shows 40 active 802.11n HT20 clients can sustain > 1.2 Mbps each on a single ch TotalChannelCapacity 50 Mbps/40 = 1.25 Mbps 18 Mbps/20 = 0.9 Mbps 30 Mbps/20 = 1.5 Mbps
  • 26.
    26 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Target Bandwidth per Client Max 40 per 5 GHz, 2ss laptops = 1.2 Mbps 2.4 GHz smartphone target max 20, ~1 Mbps
  • 27.
    27 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Step 2: Bandwidth Capacity Analysis Band Active Laptops Active Smartphones Total Active Devices Required Channels 2.4 GHz 57 101 158 =(158/20)=8 5 GHz 230 29 259 =(259/40)=7 The above channel counts provide the number of radios needed to maintain the target active client capacity (target bandwidth) per channel. Problem: Only 3 non-overlapping channels in 2.4 GHz!
  • 28.
    28 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Step 3: Channel Reuse Analysis • There are 22 available non-overlapping channels in the 5 GHz frequency range. – Channel reuse in a single open space is not required in MANY situations – Recommendation: Deploy the needed number of APs possible based on the 5 GHz channel count. In the example 288 seat auditorium we could increase the per user available bandwidth on 5 GHz by deploying more APs up to the available channel count. (assuming no overlap from adjacent rooms) • There are only 3 available non-overlapping channels in the 2.4 GHz frequency range – Based on need for capacity of 7 Channels, channel reuse is suggested – Recommendation: Plan and deploy based on channel reuse 2-3 times per channel but consider reducing to no channel reuse if active clients on 2.4 GHz are fewer than predicted.
  • 29.
    29 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example, 5 GHz Coverage 36 52 4060 44 64 48 56 -60 dBm -55 dBm -65 dBm 8 APs meets: -Coverage -Required Association Capacity -Required Active Device Capacity -No channel reuse
  • 30.
    30 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example, 2.4 GHz Coverage 6 6 111 11 1 -55 dBm -60 dBm 6 of 8 APs active (vs. 3) Meets: -Coverage Requirement -Association Capacity -Active Device capacity not met based on design parameters in 2.4 GHz -Active device bandwidth capacity not met increased by channel reuse (requires rework of 2.4 GHz objectives)
  • 31.
    31 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Example #2 Large Public Venue (LPV)
  • 32.
    32 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • Typical LPV example: – 20,000 Seat Indoor Arena: One large RF space • Design Goals (repeat) 1. All client devices can connect reliably to the network… on the BEST AP that will minimize impact on available airtime 2. Once connected they can do whatever they want to do, whenever they want to do it… as quickly as possible, finish, and open the air for someone else 3. When they move they will roam seamlessly from one AP to another… with a minimum disruption to airtime Design Example #2 Large Public Venue (LPV)
  • 33.
    33 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • LPV Design Process – Step 1: Provide solid coverage to every seat (-65 dBm in both 2.4 GHz and 5 GHz bands), even when crowd is present – Step 2: Capacity Analysis • Association Capacity • Active Device Capacity • Bandwidth Considerations Design Example #2 Large Public Venue (LPV)
  • 34.
    34 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf LPV RF Coverage • Several Strategies available for providing good coverage • The following photos show some examples
  • 35.
    35 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf “Under-Seat” Installation
  • 36.
    36 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf “Under Concrete” Installation
  • 37.
    37 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete Example
  • 38.
    38 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Coverage Strategy – Overhead Narrow Beam Antennas
  • 39.
    39 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Catwalk Installation Example
  • 40.
    40 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Bowl Catwalk Strategy Example Catwalk Coverage
  • 41.
    41 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Outer Catwalk Example Coverage: -65 dBm from 4 APsOuter Catwalk Coverage ANT-2x2-2314/5314
  • 42.
    42 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Example Inner Catwalk Coverage ANT-2x2-2314/5314
  • 43.
    43 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Stadium“30 Degree Sector” Antenna Comparison Other
  • 44.
    44 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Stadium 30 degree Sector Antenna Comparison Other
  • 45.
    45 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete: -50 dBm 45Aruba Confidential
  • 46.
    46 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete: -55 dBm 46Aruba Confidential
  • 47.
    47 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Under Concrete : -60 dBm 47Aruba Confidential
  • 48.
    48 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Capacity Analysis • For a large public venue, it is helpful to use manifest information to analyze association and active user capacity on a section by section basis
  • 49.
    49 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf 2013 Capacity Analysis Per AP Per AP Per AP Expected Associations Active Devices Associations Active Devices Estimated Uplink Area Seats APs 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total 2.4 GHz 5 GHz Total Average (Mbps) Section 118 734 5 138 46 184 69 23 92 28 10 38 14 5 18 0.490666667 Section 117 1366 9 257 86 343 129 43 172 29 10 39 14 5 19 0.508148148 Section 116 1066 7 200 67 267 100 34 134 29 10 39 14 5 19 0.508571429 Section 314 811 5 153 51 204 77 26 102 31 11 42 15 5 20 0.544 Section 321 1002 7 188 63 251 94 32 126 27 9 36 13 5 18 0.478095238 Section 110 378 3 71 24 95 36 12 48 24 8 32 12 4 16 0.422222222 • List Sections and seat counts, and APs planned per section • Estimate expected Associations and Active devices • Per AP Values – Assocations and Devices • Uplink Estimate – Based on Per Session Usage, 5 min average (2014 is about double now)
  • 50.
    50 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf 2013 Capacity Analysis • Typical per-user bandwidth required (average) is ~20 kbps even in environments where individual speedtests can support >50 Mbps! • How? Most Clients get on, get done quickly, get out of the way for the next guy.
  • 51.
    51 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Example: Moda Center 3/5/2014 Client Session Summary Sessions: 32146 Unique clients: 4217 Unique APs: 289 Avg session duration: 11 mins Total traffic (MB): 94107.51 Avg traffic per session (MB): 2.93 Avg traffic per client (MB): 22.32 Avg bandwidth per client (Kbps): 26.75 Avg signal quality: 24.51 Airwave stats: ~20% of capacity (20,000 seats) 50-60% of this value typically concurrent Total Traffic 94 Gbytes Per session, Per user stats Total Traffic 94 Gbytes
  • 52.
    52 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Configuration Best Practices
  • 53.
    53 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Design Configuration • Goal: Maximizing available Airtime by Design – In previous section we designed for high rate coverage – Now, lets really take advantage of it! • Increase Beacon and Basic Rates – These rates are used for most types of management traffic including beacons, probe responses, association requests, etc. – In environments with lots of APs to meet high association capacity requirements it is critical to increase these rates as high as possible that will allow clients to still connect – Increasing these rates has side effect of encouraging clients to move to their “best AP” since they can not decode higher rate frames as they get farther away
  • 54.
    54 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf • Increase data rates: Once a client is on an AP, require it to use a high rate to maximize available airtime. • Use 20 MHz channels in dense environments, or environments with mixes of clients. At present 4x VHT20 or HT20 channels appear to still provide more aggregate throughput than a single 80 MHz channel when there are a lot of clients and APs in range. • Increase max retries: Whenever channel reuse is happening, potential for collisions increases. Allowing more retries reduces drops. • Limit Probe Responses: In environments with lots of unassociated clients, probe responses can be a significant use of airtime. • Limit broadcast and multicast to known applications requiring these protocols Design Configuration
  • 55.
    55 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Configuration – SSID Profile Items in italics are ArubaOS default
  • 56.
    56 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Configuration – Other Profiles Items in italics are ArubaOS default
  • 57.
    57 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Controller Troubleshooting
  • 58.
    58 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf What could affect Airtime?
  • 59.
    59 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Low Client Health
  • 60.
    60 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Investigating Low Client Health
  • 61.
    61 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Investigating Low Client Health
  • 62.
    62 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf AP Neighbors
  • 63.
    63 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems AP Client Table
  • 64.
    64 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
  • 65.
    65 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
  • 66.
    66 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Quality
  • 67.
    67 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Airwave Troubleshooting
  • 68.
    68 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Client Health Dashboard
  • 69.
    69 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Low Client Health
  • 70.
    70 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Low Signal Strength
  • 71.
    71 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems RF Capacity
  • 72.
    72 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems <1% Time Exceeded Threshold
  • 73.
    73 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems AP with High Channel Utilization
  • 74.
    74 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Utilization Revealed
  • 75.
    75 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems How many RF Neighbors?
  • 76.
    76 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Mobile Wi-Fi Tools
  • 77.
    77 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Aruba Utilities – Handover Tab
  • 78.
    78 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Aruba AirO – Easy Health Check
  • 79.
    79 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Quick Internet Throughput Test
  • 80.
    80 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Ping & DNS
  • 81.
    81 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Ping & DNS
  • 82.
    82 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Aruba Spectrum Analyzer
  • 83.
    83 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Real Time FFT
  • 84.
    84 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Real Time FFT
  • 85.
    85 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Using Airtime to Troubleshoot RF Problems Channel Summary
  • 86.
    86 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf 3rd Party Analysis
  • 87.
    87 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Airmagnet Spectrum
  • 88.
    88 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Questions?
  • 89.
  • 90.
    90 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf
  • 91.
    91 CONFIDENTIAL © Copyright 2014.Aruba Networks, Inc. All rights reserved #AirheadsConf Download Airheads Mobile
  • 92.
    92 Thank You #AirheadsConf CONFIDENTIAL © Copyright2014. Aruba Networks, Inc. All rights reserved

Editor's Notes

  • #4 30:24 – 32:44
  • #5 30:24 – 32:44
  • #53 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #58 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #68 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #77 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #83 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #87 In this presentation, I want to take everybody ‘Back to Basics’ on what are some of the fundamental elements that makes a wireless work flawlessly.
  • #90 21:44 – 24:16