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1
802.11ac Introduction
with Mikrotik RouterOS
Brian Vargyas – Baltic Networks USA
MUM USA – Sept 11, 2014
2MIKROTIK MUM USA 2014
Overview of this Presentation
• Brief Introduction
• Introduction to 802.11ac
• Benefits of “ac” over “n”
• Indoor vs Outdoor
• RouterOS 802.11ac Specifics
• RouterOS Configuration
3MIKROTIK MUM USA 2014
Who Am I?
• Owner of Baltic Networks, your Midwest distribution partner for over 25 different manufacturers.
• Involved in the telecommunications industry since 1985. A ISP/WISP owner/operator for 12+ years.
• Dedicated to solving unique problems through innovation.
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History of 802.11
• 802.11a/b/g (Peak Data Rates to 54Mbps)
• 802.11n (Peak Data Rates to 600Mbps)
• 802.11ac (Peak Data Rates of 6.93Gbps!)
• 8 Spatial Streams
• 256 QAM modulation
• 160 Mhz Bandwidth Channel Size
• Not Really Useful for Enterprise Deployments (Large Channel Sizes)
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802.11ac Categories of Usage
• Wireless Displays
• In Home Distribution of HDTV
• Rapid Upload/Download of Large Files
• Point to Point Backhaul Traffic
• Campus and Large Venue Deployments
• Manufacturing Floor Automation
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802.11ac and 5Ghz
• 5Ghz Band Operation Only
• 25 Non-Overlapping Channels (20Mhz)
• Introduces 80Mhz and 160Mhz Channel Sizes
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2.4Ghz Stuck in 2013?
Not Enough Spectrum to Operate In!
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Wider Bandwidth = Higher Rates
* Graphic © Qualcomm
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Higher Order Modulation
* Graphic © Qualcomm
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256-QAM
• Requires 802.11ac and client!
• Efficiency gain in modulation does not increase linearly
• Higher-order modulation adds complexity, which requires higher SNR
• Comes at a cost of distance……
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Constellation Diagram
* Images from Ruckus Wireless
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Larger Frame SizesThroughput does not equal data rate!
* Images from Ruckus Wireless
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The Future - Wave 1 vs Wave 2• Today – Wave 1 (Today’s 802.11ac)
• 33% Gain
• Twice the Capacity
• 3 Spatial Streams
• 2015 – Wave 2 (In-Testing Chipsets)
• Wave 1 Features
• 160Mhz Channels
• 3+ Spatial Streams
• MU-MIMO
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MU-MIMO
• Transmits Simultaneous Downlink Frames to Different Clients.
• Significant Capacity Enhancements with many single-stream devices.
• Requires 802.11ac MU-MIMO clients
• Benefits Indoor clients with 1x1
• Outdoor 2x2 operation, unknown benefits
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Single User vs Multi-User MIMO
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Dynamic Bandwidth Management
• 802.11ac Introduces this new concept
• Really good for channel sizes >20Mhz
• Allows some traffic, even in adjacent channel interference.
802.11ac Dynamic Mode
802.11n No Transmission
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Minimum Receiver Sensitivity
• Loss of 7 dBm from 64-QAM to 256-QAM
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Channel Planning
Note: Red Areas are Channels Not Permitted
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Mikrotik 802.11ac Platforms
RB953GS-5HnT
+ R11e-5HacD
Atheros QCA9882
2 x 2 MIMO
RB922UAGS-5HPacD
Atheros QCA9882
2 x 2 MIMO
RB911G-5HPacD
Atheros QCA9882
2 x 2 MIMO
+
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Outdoor Signal and Receive Sensitivity
Tx/Rx Sen 802.11nRB912
802.11acRB922
MCS 7 (64qam) 24dBm/-78dBm 27dBm/-77dBm
MCS 9 (256qam) N/A 22dBm/-72dBm
• From 802.11n -> 802.11ac
• Tx 24dBm to 22dBm = Loss of 2dBm
• From 802.11n -> 802.11ac
• Rx -78dBm to -72dBm = Loss of 6dBm
• Total Loss of TX and RX = 8dBm!
• About Difference of 2’ vs 3’ Dish
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3x3 MIMO Hard in Outdoor Environment
• Really need polarity isolation of >30dBm
• Less then that will cause some self interference.
• Antenna designs beyond 2 x 2 are expensive
• Slant antenna designs with combined horizontal and vertical components have can less then 30dBm of isolation
H
VS
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RouterOS NV2
• Unless compatibility is required with 3rd party devices, recommended to use NV2 protocol mode.
• NV2 is a TDMA mode that uses solves the 802.11 hidden node problem and will scale in a much busier network. Even PtP links will benefit from consistent latency.
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.ac in RouterOS
• V6.16 Introduced 802.11ac (July-17th)
• V6.18 Provided Minor Fixes
• V6.19 Improvements to NV2 and 802.11ac
• Wireless-FP Package (Default on .ac systems)
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CAPsMANager
• Provides unique way to manage hundreds of access points (CAPs) via a single system (MANager)
• Template Based
• Works at Layer 2 or Layer 3
• Dump client traffic at local CAP or tunnel to MANager
• VLAN Aware
• Requires wireless-fp package
• Perfect for managing new 802.11ac channels
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Wireless AP Setting Change
• Big Changes in 802.11 Channel-Width
802.11n Device
802.11ac Device
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Now 80Mhz Channels!
YA!
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C vs E? Huh?
• C = Center Channel Frequency
• E = Extension Channels
• Options are: Ceee, eCee, eeCe, eeeC
e e C e
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Fastpath It!
• Improve your wireless with new hardware queue feature!
• Changes the wireless interface to only use hardware queue, not software… Less CPU!
• Supported in V6.16+ wireless-fp
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Configuration Examples
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Access Point Configuration
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Station Configuration
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NV2 Settings – Link Encryption
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Add Bridge And Allow Fast Path
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Add Ports to Bridge Group
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Set up Wireless Fast Path
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Verify Link Connected
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Tx/Rx Rate Information
Speed and
Channel Size
2S = 2 Streams
3S = 3 Streams
SGI = Short Guard
Interval
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Summary Tips:• Keep Signal Levels in the -40’s to -50’s, Low
SNR helps keep modulation rates high
• Don’t overdrive the receiver
• Use lowest channel size the application calls for (Be a good bandwidth neighbor)
• Use fastpath feature to decrease system load
• Stick with high pole isolation antenna designs
• No more 8 mile CPE installs! 2-3 miles Max!
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Questions?Live Demonstration