Back to the Roots ‐ Back to GOOD WIFI - magellan …€¦ ·  · 2017-10-12Back to the Roots ‐ Back to GOOD WIFI ... Aerohive Networks ©2017 Aerohive Networks Confidential 2

©2017 Aerohive Networks Confidential

Mathew Edwards, Aerohive Networks

Back to the Roots ‐Back to GOOD WIFI

David Simon, Aerohive Networks

©2017 Aerohive Networks Confidential 2

• RF Fundamentals

• 2.4 GHz deep dive

• 5 GHz deep dive

• 802.11ac

• Dual 5GHz capabilities/benefits

3

Understanding Radio Frequency

What is Radio Frequency?Radiofrequency (RF) is a rate of oscillation in the range of around 3kHz to 300GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals - Wikipedia

4

• The 5 GHz UNII Bands Channels

5

• The 2.4 GHz ISM Band

Radio Frequency Bands used in Wi-Fi

The 2.4 GHz Band• The 2.4GHz spectrum for 802.11 usage is only 83MHz

wide• Each channel is either 22 MHz wide or 20 MHz wide

based upon modulation type• There are 14 channels in this range (but only 3 non-

overlapping)• Used for 802.11 b/g/n

6

2.4 GHz ChannelsUsed for 802.11b/g/n• Channels 1, 6, and 11 are the only non-overlapping

channels between within 1 through 11- Using channels that cause overlap may cause CRC errors and

other wireless interference or collisions.

7

Channel Reuse Pattern

8

In this plan only the non-overlapping channels of 1, 6 and 11 are used.In this plan only the non-overlapping channels of 1, 6 and 11 are used.

Adjacent Cell Interference

9

Improper designs use overlapping channels in the same physical area.Improper designs use overlapping channels in the same physical area.

The 5 GHz Band• Multiple bands for use

] UNII 1] UNII 2] UNII 2 Extended] UNII 3

• OFDM channels are approximately 20 MHz wide• There are 23 channels in this range• The channels do not overlap as in 2.4 GHz• Dynamic Frequency Selection (DFS)is required for

use in certain regions to utilize some channels

10

5 GHz ChannelsUsed for 802.11a/n/ac• The 5 GHz spectrum has more non-overlapping channels available.

11

Today’s Landscape

12

Why 5GHz?• Less noise• More channels• Wider channels

Which means…..• Higher data rate• Higher throughput

8/4/2017 13

The Need for Speed

The Need for Speed

50% of clients shipping are802.11ac (only runs on 5 GHz!)

Wider Channels

256 QAM

More Spatial Streams

MU-MIMO

What makes 802.11ac go faster?

SU‐MIMO MU‐MIMO

MU-MIMO – Preventing Capacity Waste

19

Wave 1 Wave 2

Gbps

80 MHz Channels

3 Spatial Streams

256 QAM

160MHz Channels

MU-MIMO

4 Spatial Streams

U‐NII‐1(100 MHz)

U‐NII‐2A(100 MHz)

U‐NII‐2C(255 MHz)

New BandU‐NII‐2B(120 MHz)

New BandU‐NII‐4(75 MHz)

U‐NII‐3(125 MHz)

5.150 GHz 5.250 GHz 5.350 GHz 5.470 GHz 5.725 GHz 5.85 GHz 5.925 GHz

New proposed U-NII Bands & Channels

21

Radio 2

GHz

Radio 1

GHz

Radio 1

GHzSoftware

ConfigurableRadios

Dual 5 GHz capabilities

8/4/2017 22

Radio 15GHz 11ac

Adaptive Wave 2Software Defined Radios

Radio 25GHz 11acOR 2.4GHz 11n

Maximize Performance

Maximize Efficiency

Maximize Investment

© Aerohive Networks, Proprietary & Confidential

High density design – Dual 5 GHz?

24

•Fixed 5 GHz radios•Disable two out of every three 2.4 GHz radios?• Instead convert two out of every three of the adjustable radios to 5 GHz

Channel Planning] High-Density

- ALWAYS use 20 MHz channels!] Normal-Density

- 40 MHz channel plan] Low-Density

- 40 MHz or 80 MHz channel plan] Single AP Sites

- You could use 160 MHz

Use DFS unless a specific critical client doesn’t support it

Channel Planning

© Aerohive Networks, Proprietary & Confidential

Dual 5 GHz design guidelines

27

•DFS channels will need to be enabled

•When possible, pair non-DFS channels with DFS channels (This ensures connectively for clients that do not support DFS)

3x3

2.6Gbps

4x4

3.5Gbps

2x2

1.2Gbps

802.11ac Wave 1 802.11ac Wave 2

Access Point Portfolio

3x3

1.7Gbps

© Aerohive Networks, Proprietary & Confidential

Dual 5 GHz benefits

29

• ROI (Return on investment)•High density implications/increase in overall capacity • Less interference • Future-proof investment

8/4/2017 30

Wrap up

Aerohive®

NETWORKS

Questions?