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7/31/2019 Cisco 802.11n Speeds
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1 2009 Cisco Systems, Inc. All rights reserved. Cisco PublicBRKCAM-3007
Understandinghigh speed 802.11nwireless networks
in depth
BRKCAM-3007
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2 2009 Cisco Systems, Inc. All rights reserved. Cisco PublicBRKCAM-3007
Housekeeping
We value your feedback- don't forget to complete youronline session evaluations after each session & complete
the Overall Conference Evaluation which will be availableonline from Thursday
Visit the World of Solutions
Please remember this is a 'non-smoking' venue!
Please switch off your mobile phones
Please make use of the recycling bins provided
Please remember to wear your badge at all timesincluding the Party
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Agenda
802.11n Technology Fundamentals
802.11n Access Points1140 and 1250
Design and Deployment
Planning and Design for 802.11n in Unified Environment
Key Steps for Configuration of 11n in a Unified Environment
11n Client Adapters
11n Troubleshooting
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802.11n Advantages
Increased Bandwidthfor emerging and
existing applications
Reduced Retriespermitting low latency
and delay sensitiveapplications such asvoice
Reduced dead spotspermitting consistent
connectivity for everyapplication
Throughput Reliability Predictability
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40Mhz
Channels
Packet
Aggregation
Backward
Compatibility
Technical Elements of 802.11nMIMO 40Mhz Channels Packet
AggregationBackward
Compatibility
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MIMO (Multiple Inputs Multiple Outputs)
MIMO is pronounced mee-moh or my-moh
802.11n it is mandatory requirement to have at leasttwo receivers and one transmit per band
Optional to support up to four TXs and four RXs
MRCMaximum ratio combining
SMSpatial multiplexing
Note: MIMO provides improvements for non-n802.11 clients *
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Comparing SISO and MIMOSignal Reception
One radio chain
Switches between antennas
Either A or B
Multipath degrades
Three radio chains
Aggregates all antennas
A and B and C
Multipath improves
Better immunity to noise
Better SNR than SISO
DS
PRadio Radio
Radio
Radio
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MIMO Radio Terminology
TxR:S
Transmit Antennas x Receive Antennas : Spatial Streams
T Transmit Antennas
R Receive Antennas
S Spatial Streams (1 = 150Mbps, 2 = 300Mbps)
The 1250 and 1140 are 2x3:2
Two Transmit, Three Receive, Two Spatial Streams
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Maximum Ratio Combining
Performed at receiver (either AP or client)
Combines multiple received signals Increases receive sensitivity
Works with both 11n and non-11n clients
MRC is like having multiple ears to receive the signal
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Illustration of Three MultipathReflections to SISO AP
MultipathReflections ofOriginal Signal
Signal EachAntenna Sees
Due toMultipath Effect
Radio Switchesto Best Signalwith Least
Multipath Effect
Radio
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Illustration of Three MultipathReflections to MIMO AP with MRC
The DSP Adjuststhe Received SignalPhase So They CanBe Added Together
The Resulting SignalIs Addition of
Adjusted ReceiveSignals
Multipath Reflectionsof Original Signal
DS
PRadio
Radio
Radio
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MIMO vs. SISO Dead Spot Assessment
Y-Axis MovementY-Axis MovementX-Axis MovementX-Axis Movement
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SISO vs. MIMO Dead Spots
1240 with Intel 3945ABG 1250 with Intel 5300AGN92 90 96 84 92 90 90 89 89 84 88 89 91 95
90 90 92 89 90 94 98 93 91 90 89 86 92 92
98 91 96 96 98 92 90 92 92 90 90 90 95 92
91 97 91 97 92 91 89 91 90 95 91 96 90 99
97 92 91 92 90 94 90 91 89 90 91 90 90 97
98 92 90 85 94 91 99 88 91 90 97 95 97 93
92 92 89 89 95 91 86 94 92 91 97 91 92 98
99 97 90 99 97 93 94 90 93 92 90 93 94 9996 96 97 95 95 94 89 90 90 97 96 90 97 98
96 98 99 91 97 92 95 91 96 98 97 95 93 98
98 93 91 99 96 89 96 91 91 92 93 97 93 100
91 96 91 89 92 93 91 91 96 94 92 93 99 97
96 97 96 98 96 98 96 96 98 96 99 97 98 98
98 98 98 98 92 98 96 95 90 91 96 98 98 99
82 77 39 83 80 83 88 78 71 65 64 80 25 64
38 52 54 48 71 85 85 52 70 69 89 66 91 68
67 89 71 81 48 80 69 56 72 45 45 86 91 89
70 75 70 49 85 55 56 88 62 78 69 75 73 93
58 67 80 62 70 90 69 65 91 69 55 69 70 61
57 69 67 71 90 70 21 71 69 68 53 68 92 67
70 89 74 66 67 69 58 68 88 65 68 87 90 91
28 90 31 90 57 69 90 75 64 71 89 89 88 8344 72 75 82 69 28 41 34 42 41 52 68 67 71
43 81 39 54 69 92 42 90 67 74 92 61 61 70
69 90 72 61 41 89 53 88 56 46 69 71 67 69
74 96 59 87 67 90 68 75 62 38 69 64 59 100
56 56 85 25 32 50 50 62 87 67 47 67 74 68
63 68 85 86 82 33 84 88 83 72 59 43 87 49
Each square represents a slight position change
Number is percentage of maximum throughput
802.11n provides more predictability through MRC
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Spatial Multiplexing
MIMO (Multiple Input, Multiple Output)
40Mhz Channels PacketAggregation
BackwardCompatibility
Transmitter andReceiverParticipate
ConcurrentTransmission onSame Channel
IncreasesBandwidth
Requires 11nClient
Performance
stream 1
stream 2
Information Is Split and Transmitted on Multiple Streams
MIMO AP
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SISO Data Transmission
RadioRadio
Thequickbrownfox
Data
TheTheThe
Data
Time Period 1
RadioRadioquickbrownfox
Data
quickquickThe
quick
Data
Time Period 2
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MIMO Spatial MultiplexingData Transmission
Thequickbrownfox
Data TheThe
Thequick
Data
Time Period 1
Time Period 2
TXRadio
TX
Radio
quickquick
RX
Radio
RXRadio
DSP
DSP
brownfox
Data brownbrown
Thequickbrown
fox
Data
TXRadio
TXRadio
foxfox
RXRadio
RXRadio
DSP
DSP
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More Efficient Spectrum Utilizationwith MIMO Spatial Multiplexing
The data is broken intotwo streams transmittedby two transmitters atthe same frequency
DSP
DSP
TXRadio
TXRadio
Data
Data
Data
Stream B
Stream A
Data
I Can Recognize the TwoStreams Transmitted at
the Same Frequency Sincethe Transmitters Have
Spatial Separation UsingMy Three RX Antennaswith My Multipath and
Math Skills
Radio
Radio
Radio
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MIMO Packet
Aggregation
Backward
Compatibility
Technical Elements of 802.11nMIMO 40Mhz Channels Packet
AggregationBackward
Compatibility
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MIMO (Multiple Input, Multiple Output)40Mhz Channels
40-MHz ChannelsMIMO 40Mhz Channels Packet
AggregationBackward
Compatibility
Moving from 2 to 4 Lanes
40-MHz = 2 aggregated 20-MHz channelstakes advantage of thereserved channel space through bonding to gain more than double thedata rate of 2 20-MHz channels
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Double Wide Channel40-MHz Wide Channel Support
802.11n supports 20 or 40 MHz wide channels40 MHz wide channels recommended only for 5 GHz
Consists of a primary channel and a secondary channel
also referred to as extension channelSecond channel must be adjacent
Can be above or below primary
Protection provided for 20 MHz wide client use
20-MHz
20-MHz
40-MHzGained Space
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40 MHz-Wide Channel
Spectrum Expert Trace for 40 MHz-wide channelchannel 36 primary and channel 40 extension
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MIMO 40Mhz
Channels
Packet
Aggregation
Backward
Compatibility
Technical Elements of 802.11nMIMO 40Mhz Channels Packet
AggregationBackward
Compatibility
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40Mhz Channels
Aspects of 802.11n
Packet Aggregation
40Mhz Channels PacketAggregation
MIMO BackwardCompatibility
Carpooling Is More Efficient Than Driving Alone
Without Packet Aggregation
DataUnit
Packet
802.11nOverhead
DataUnit
Packet
802.11nOverhead
DataUnit
Packet
802.11nOverhead
With Packet Aggregation
Data Unit
Packet
802.11nOverhead
PacketPacket
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Packet Aggregation
All 11n devices must support receiving of either packetaggregation method A-MPDU or A-MSDU
A-MPDU packet aggregation is what 1250 and 1140will use for packet aggregation with block acknowledge
Without packet aggregation
With packet aggregation
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MIMO 40Mhz
Channels
Packet
Aggregation
Backward
Compatibility
Technical Elements of 802.11nMIMO 40Mhz Channels Packet
AggregationBackward
Compatibility
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Packet AggregationBackward Compatibility
Aspects of 802.11nPacket
AggregationBackward
CompatibilityMIMO 40Mhz Channels
2.4GHz 5GHz
802.11ABG Clients Interoperate with 11n ANDExperience Performance Improvements
11n Operates
in BothFrequencies
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802.11n HT PHY
To provide legacy co-existence all 11n transmissionstoday use a mixed mode PHY that encapsulates the HTPHY in the Legacy PHY when transmitting at HT rates
Legacy devices degrade 11n device performancebased on duty cycle they use in the spectrum
Legacy 802.11n (HT)
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Co-existence of ABG/N APs
Benefits of 11n accrue to ABG clients
MIMO benefits ABG clients on the AP receive side from MRC
Backward Compatibility & Co-Existence
11n11g
11g 11n
300 Mb
54 Mb
48 Mb
36 Mb
28 Mb
WLAN Controller
Backwards CompatibilityCo-Existence at Controller Level
11n11g
11g 11n
300 Mb54 Mb
WLAN Controller
Roam
802 D R
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802.11n Data RatesMCSModulation and Coding Scheme
802.11a/b/g used data rates
802.11n defines MCS rates
77 MCS rates are defined by standard
1140 and 1250 support 16 (MCS 0-15)
Eight are mandatory
Best MCS rate is chosen based on channel conditions
MCS specifies variables such asNumber of spatial stream, modulation, coding rate, number offorward error correction encoders, number data subcarriers andpilot carriers, number of code bits per symbol, guard interval
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MCS Chart
MCSIndex
Modul-ation
SpatialStreams
802.11n Data Rate
20 MHz 40 MHz
L-GI S-GI L-GI S-GI
0
BPSK 1 6.5 7.2 13.5 151 QPSK 1 13 14.4 27 30
2 QPSK 1 19.5 21.7 40.5 45
3 16-QAM 1 26 28.9 54 60
4 16-QAM 1 39 43.3 81 90
5 64-QAM 1 52 57.8 108 120
6 64-QAM 1 58.5 65 122 135
7 64-QAM 1 65 72.2 135 150
8 BPSK 2 13 14.4 27 30
9
QPSK 2 26 28.9 54 6010 QPSK 2 39 43.3 81 90
11 16-QAM 2 52 57.8 108 120
12 16-QAM 2 78 86.7 162 180
13 64-QAM 2 104 116 216 240
14 64-QAM 2 117 130 243 270
15 64-QAM 2 130 144 270 300
Maximum
with 1 spatialstream
Maximumwith 2 spatial
streams
A Few More 802 11n Features
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A Few More 802.11n FeaturesUsed to Increase Performance
Beam forming
Reduced inter-frame spacing
Reduced guard interval
From 800ns to 400ns betweensymbols
QAM 64
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Cisco Next-Generation Wireless Portfolio
Cisco Aironet 1140 Series
Carpeted Indoor Environments
Easy to Deploy-Sleek design with integratedantennas
802.11n performance with efficient 802.3af power
Blends seamlessly into the environment
Cisco Aironet 1250 Series
Rugged Indoor Environments
Versatile RF coverage with external antennas
Flexible power options for optimal RF coverage
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11a/g to 11n Access Point Migration
Indoor Environments
Integrated Antennas
Rugged Environments
Antenna Versatility
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1140 vs 1250 Positioning
1140 1250
Deployment Indoor Ruggedized
Antennas Integrated External (RP-TNC)
Wired Uplink Gigabit Gigabit
Power Options PoE, AC, Pwr Injector PoE*, ePoE, AC, Pwr Injector
* 1250 runs on PoE with reduced performance
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1250 AP
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The Aironet 1250 Series Access Point
Modular
2.4 GHz Module
5 GHz Module
RP-TNC Antenna Connectors
10/100/1000 Ethernet port
Console port
Security lock
Ruggedized metal exterior
Mounting bracket uses same hole pattern
Runs either LWAPP or Autonomous Cisco IOS
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Full Performance
Power Injector
Full Performance
Local AC Power
1250 Power Options
Less Than Full Performance with Two Modules
Standard 802.3af PoE
Full Performance
Cisco Enhanced PoE
Aironet1250
Full 802.11nRequires MoreThan Standard
802.3af Powerover Ethernet
New Antennas for AP1250
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New Antennas for AP1250Use 3 Antennas for each band
Omni-Directional
Single enclosure with threeantenna elements
2.4 GHz 3dBi (AIR-ANT2430V-R)
5 GHz 4 dBi (AIR-ANT5140V-R)
Dipoles
New dipole without hinge (gray)
2.4 GHz 2.2 dBi (AIR-ANT2422DG-R)
5 GHz 3.5 dBi (AIR-ANT5135DG-R)
Also supports existing dipoles with hinge(black and white)
Blue dot indicates 5 GHz
Three
Elemen
ts
Three PoE Modes Supported
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Three PoE Modes Supportedwith 1250 AP
Enhanced mode use ~18.5 Watts (config port for 20 Watt)
3560-E Cisco IOS Version 12.2(44)SE
3750-E Cisco IOS Version 12.2(44)SE4500EX4648E , X4648+E Cisco IOS Version 12.2(44)SG
1250 injector
Optimized mode 16.8 Watts
6500X6148, X6148A , X6548 Cisco IOS Version 12.2(33)SXH2
PoE daughter cards: WS-F6K-48-AF, WS-F6K-GE48-AF
802.3af mode 15.4 Watts
Any 802.3af switch
Cisco IOS versions are minimum to support greater than .AF PoE mode
Maximum Data Link Speed
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pfor Three PoE Modes
Enhanced and optimized power mode deliver the sameperformance in 5 GHz because it uses two spatial streams
Enhanced and optimized power mode deliver sameperformance in 2.4 GHz for dense deployments
The difference is Optimized Max TX drops from 20 dBm withEPoE to 14dBm with Optimized
2.4 GHzMbps
5 GHzMbps
SpatialStreams
Enhanced
(18.5 Watts)
144 300 2
Optimized(16.8 Watts)
144 300 2
802.3af
(15.4 Watts)
72 150 1
Reduced Output Power
Reduced Performance
Full Performance
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WLC Showing PoE Mode in Use
Enhanced Mode Optimized Mode AF Mode
Maximum Throughput
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1140 AP
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Access Point
has the following:
Mode buttonConsole Port
Ethernet PortLocal Power
Note: Full 802.11n functionality using IEEE 802.3af (15.4 Watt)power
1140 Ports are on the back
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Infrastructure Considerations
AP Power
Power Over Ethernet (802.3af)
1250 Power Injector (AIR-PWRINJ4)
Local AC Power
Switch port uplink
Gigabit Ethernet RecommendedFast Ethernet will work
However, the wired uplink can become a bottleneck
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Still Three Antennas per Band
11401250
2.4GHz 4dBi
5GHz 3dBi
1140 Access Point
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Designed for Horizontal Mounting
Similarly to the AP1130, the AP1140 is designed to bemounted horizontally on the ceiling
Vertical mounting works but is not ideal
1140 M i B k
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1140 Mounting Brackets
Uses same T-Railsystem as AP1130
both bracket and T-Rail
included with unit
1140 S it M ti
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Access Point can be securedusing a Kensington style
locking cable, or secured inthe bracket using a common
padlock
1140 Security Mounting
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Planning and Designfor 802.11n
**
Ph f 11 D l t
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Phases of an 11n Deployment
Design Considerations
1:1 Replacement Strategy for Capacity
5GHz Strategy
Planning
WCS Planning Tool
Infrastructure Considerations
Deployment
Site Survey
Operation
Configuration (40MHz RRM, Data Rates, Security, etc.)
Tracking and augmenting controller capacity
1130 Access Point Placement
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1130 Access Point Placement
1130 Access Point Placement
1 per 5,000 sq feet for data only
1 per 3,000 sq feet for voice, location
Several SupportedApps
Web
Radio Resource Management
Adaptive channel / power coverage
Operational simplicity
1140 Access Point Placement
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1140 Access Point Placement
Improved coverage athigher data rates
1 for 1 replacement
AP1140 reuses existing
AP1130 T-Rail Clip
More Applications Supported
at Any Given Location
WebVoice
Video
Backup
ERP
ABG
ABG
ABG
ABG
Effective Frequency Use5GHz and 2.4GHzCreate a 5GHz Strategy
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Create a 5GHz Strategy
5GHz Recommended for 802.11n
More available spectrumgreater number of channels
Reduced interference (no Bluetooth, Microwave Ovens, etc.)
Maximum throughput in a 40MHz channel
Many 11n devices only support 40MHz in 5GHz
2.4GHz still benefits from MIMO and packetaggregation
1
6 11
2
1 3 5 7 9 11
4 6 8 10
5GHz 40MHz Channels2.4GHz 20MHz Channels
Capacity PrinciplesCh l C it U 5 GH d 2 4 GH
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Channel Capacity: Use 5 GHz and 2.4 GHz
2.4 GHz clients using N will consume less spectrum
5 GHz will provide the most capacity for 802.11n clients
More available spectrumgreater number of channels
Greater speeds dues to 40 MHz channel the fact that many devices will onlysupport 40 MHz channel in 5 GHz
DFS support allows up to 1140 MHz wide channels to be used
in 5 GHz bandIf radar is detect in the area some UNI2 and UNI2 channels may disabled
5 GHz Frequency
UNI 1 UNI 2 UNI 2 Ext. UNI 3UNI 2 UNI 2 Ext.
2 2 5 2# 40 MHzChannels FCC
1140 Deployment ExpectationsData Services
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Data Services
Range
10-15% increase in maximum range versus an AP1130
Recommended 1:1 replacement of an 802.11a/g deployment
Coverage
10-20% increase in 802.11a/g high data rate coverage
More uniform coverage versus an AP1130
Capacity
Largest gain for 802.11n capable clients
Maximum data rates of 144Mbps in 2.4GHz
Maximum data rates of 300Mbps in 5GHz
Throughput: Example 802.11a TCPPerformance Ideal Environment
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Performance Ideal Environment
Approximately 45% of link rate
Throughput: Example 802.11n 5 GHz40 MHz TCP Performance Ideal Environment
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40 MHz TCP Performance Ideal Environment
Approximately 65% of link rate
1140 Deployment ExpectationsAdvanced Services
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Advanced Services
Voice
Plan for the same number of calls per AP as 11a/g (15-25 calls)
Voice over WiFi phones still top out at 54Mbps
No 11n WiFi phones on the market right now
Expect better voice reliability, especially in the upstream
direction (Phone to AP)
Location
Accurate triangulation requires a density of one AP per ~3000
sqft.
Although an 11n AP can hear better, it doesnt mean locationrequires less density
11n DeploymentSite Survey Recommendations
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Site Survey Recommendations
Use Active Survey tools
AirMagnet 6.0 uses Iperf to send
traffic when surveying to measureactual data link speeds
Survey for lowest common client
Once for 11a/g clientsOnce for 11n clients (optional)
Survey at intended AP power
levels
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2.4GHz - Maximum RangeAP1130 2.4GHz AP1140 2.4GHz
Improved 802.11g Coverage1130 vs 114011G Active Survey
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1130 11G Survey
48 Mbps Coverage
86 Feet
1140 11G Survey
48 Mbps Coverage
102 Feet
1130 vs. 1140 11G Active Survey
Note the more uniform coverage of high (green) data rates
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5GHz - Maximum RangeAP1130 5GHz AP1140 5GHz
Improved 802.11a Coverage1130 vs. 114011A Active Survey
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1130 11A Survey
48 Mbps Coverage
86 Feet
1140 11A Survey
48 Mbps Coverage
97 Feet
1130 vs. 1140 11A Active Survey
Note the more uniform coverage of high (green) data rates
802.11n Coverage2.4GHz 20MHz Channel Size
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G 0 C a e S e
Maximum of 144Mbps in a 2.4GHz 20MHz channel
At 100ft average data rate is 100Mbps
100Mbps @ 100ft100Mbps @ 100ft
802.11n Coverage5GHz 20MHz Channel Size
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Maximum of 144Mbps in a 5GHz 20MHz channel
At 90ft average data rate is 100Mbps
100Mbps @ 90ft100Mbps @ 90ft
802.11n Coverage5GHz 40MHz Channel Size
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Maximum of 300Mbps in a 5GHz 40MHz channel
At 90ft average data rate is 100Mbps
300Mbps @ 30ft300Mbps @ 30ft
200Mbps @ 60ft200Mbps @ 60ft
100Mbps @ 90ft100Mbps @ 90ft
802.11n DeploymentDesigning Around 5GHz 40MHz Channels
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g g
One APData Rate vs. RSSI
Full DeploymentContiguous 5GHz Coverage
Five Principles for MaximizingCapacity with 802.11n
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1. Design for 5 GHz 40 MHz wide channelsand increased cell density
2. Design for lowest common denominatorlegacy clients when surveying with 1250 or1140
Plan to migrate client devices to 11n
Disable lower legacy rates
3. Minimize noise and interference effects
Use RRM for interference avoidance
Use Spectrum Expert to find interference source
4. Design for ePoE (for 1250) power and GigEto APs
5. Specify a good 802.11n client adapter
Design MethodWCS Planner
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Set AP type 1250 or 1140
Select enable 11n support
Select protocol 802.11a/n,bgn
Select optimize for HT
Select Voice and location if desired
Calculate/Apply/Add APs to Map
Use WCS Heat Map to Predict Data RateCoverage and AP Placement
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Add APs to MAP
Set Heat Map type to Data Rates
Set Cutoff to desired minimum data rates
WCS PlannerProposal
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Generate proposal
Use proposal for budgetary estimates
Use proposal with Lite or Full survey to create final installAP count and placement design
Recommend survey to calibrate proposal results
Network Capacity and Scalability
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Burst
0
300mb
Burst
0
300mb
Burst
0
300mb
Burst
0
300mb
BurstNormal
WLAN Controller
11n
11n
Mobility Group
WLAN Controller 2
11n 11n
Plan for system levelcapacity, not per APcapacity
Plan for throughput (60%of data rate)
Peak 1140 throughput is200-250Mbps
Additional controllerincreases capacity andimproves availability
Typical Ethernet network
oversubscription is 20:1 With 1140 APs at full
capacity, Cisco WLANcontrollers reach 10:1
11n
11n
11n
System Capacity
Add Controller
Controller Over-subscription Rates
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Even at 200Mbps per AP, high capacity controllersoversubscribed well within acceptable limits of 8:1.
21XX and WLCM platforms fully support 802.11nfunctionality
Potential bottlenecks can be removed by running in H-REAP
Monitor WLC Traffic Utilization
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Use 11n scaling report to monitor WLC utilization
Compare utilization to interface capacity to determine if AP load
should be redistributed or additional WLC capacity is needed
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Configurationof 802.11n in aUnified Environment
Enable 802.11n Mode to SupportHT Rates (On by Default)
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Enable 802.11n mode for the band
802.11a/n>High Throughput (802.11n)
802.11b/n>High Throughput (802.11n)
Configure RRM for 40 MHz Wide5 GHz Channels
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Wireless>802.11a/n>DCA Channel Width 40 MHz
Enable or Disable 5 GHz Channelsthat RRM Is Allowed to Assign
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Wireless>802.11a/n>DCA
Uncheckchannels100-140
(UNII2-Extended)
Manually Configuring40 MHz Wide Channel
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Wireless>802.11a/n>Configure AP
Must set channel assignment to Custom
Extension Channel is always set to one up from primary
Basic 11n ConfigurationWLAN Security
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y
No EncryptionGuest WLANs
WPA2/AES EncryptionEnterprise WLANs
To utilize 11n data rates, use either AES or no encryption.
Basic 11n ConfigurationWLAN QoS
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WMM Allowed WMM Required
To utilize 11n data rates, use WMM Allowed or Required
Configure Which Packets That AreAllowed to Be Aggregated MPDU
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(Cisco Controller) >config 802.11a 11nSupport a-mpdu tx
priority 0 enable
(Cisco Controller) >config 802.11b 11nSupport a-mpdu tx
priority 0 enable
(Cisco Controller)> show 802.11a/b
802.11n Status:
A-MPDU Tx:
Priority 0............................... Enabled
Priority 1............................... Disabled
Priority 2............................... Disabled
Priority 3............................... Disabled
Priority 4............................... Disabled
Priority 5............................... Disabled
Priority 6............................... Disabled
Priority 7............................... Disabled
Enables Priority 0(Best Effort)Aggregation
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Improving Mixed Mode PerformanceDisabling Unnecessary Data Rates
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Benefit: Beacons and Broadcasttraffic utilize less airtime
For 802.11b/g deploymentsDisable: 1, 2, 5.5, 6 and 9Mbps
For 802.11g-only deployments
Disable: 1, 2, 5.5, 6, 9 and11Mbps
For 802.11a deployments
Disable: 6 and 9 Mbps Higher rates can also be
disabled (ex. 12, 18Mbps)
dependant on deployment
Tuned 802.11b/g Data Rates:
Tips for Achieving the Best Performance
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1. Use 5 GHz 40 MHz wide channels
2. Consider increasing cell densities
3. Disable lower legacy data rates
4. Use full power modes for the 1250 by using injector orEPoE
5. Specify a good performing 802.11n client adapter
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802.11nClient Adapters
11n Client Adapters
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Make sure adapter is 11n Draft 2.0 certified by WiFiAlliance - http://www.wi-fi.org
802.11n adapters have a major influence onperformance levels that can be achieved
Built-in 11n adapters out perform add-on
USB and PCMCIA 11n adapters have less than optimalantenna placement
Not realistic to upgrade most older laptops with internal
11n adaptersNeed three antennas connectors
11n Client Adapter Recommendations
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Update 802.11n client drivers to the latest revision
Cisco-Intel relationship means that the Intel 11n
adapter with Ciscos APs have had the most test time
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Troubleshooting
Troubleshooting ToolsDetermining If Client Associated at 11n HT Rates with WLC
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Monitor >Clients
Protocol indicates if client associated with 802.11n HT rates
Troubleshooting ToolsDetermining If Client Associated at 11n HT Rates with WCS
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Protocol shows if client associated at 11n HT rates
Client Status Windows
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20 MHz 144Mbps
40 MHz 300Mbps
Warning: Depending on
the Adapter, You MayNot Be Able to Trustthe Speed It Reports
Client Status OSX
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Applications>Utilities>Network Utility
Client Shows 11n SSID But Does NotConnect at 11n Data Rates
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Does the client have a 11n adapter?
Some legacy clients will show that the AP support11n even though the that client does not support 11n
Is 11n support enabled in adapter driver?
Have 11n Adapter and Still Connectingat A or G Rates
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What type of encryption is allowed for WLAN?
Must be AES or None
If WEP or TKIP will not support 11n HT rates Is WMM allowed?
WMM must be Enable or Require
If WMM disabled will not support 11n HT rates
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Recommended Reading
BRKCAM-3007
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Source: Cisco Press
BRKCAM 3007
Meet The Expert
T k th t f ti t Ci N t k 2009
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To make the most of your time at Cisco Networkers 2009,schedule a Face-to-Face Meeting with a top Cisco Expert.
Designed to provide a "big picture" perspective as well as"in-depth" technology discussions, these face-to-facemeetings will provide fascinating dialogue and a wealth of
valuable insights and ideas.
Visit the Meeting Centre reception desk located in theMeeting Centre in World of Solutions
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Q and A
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