802.11ac intro with routeros

8/17/2019 802.11AC Intro With RouterOS

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802 11ac Introduction

with Mikrotik RouterOS

Brian Vargyas – Baltic Networks USA

MUM USA – Sept 11, 2014



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.




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




802.11ac and 5Ghz

• 5Ghz Band Operation Only

• 25 Non-Overlapping Channels (20Mhz)

•

Introduces 80Mhz and 160Mhz Channel Sizes




2.4Ghz Stuck in 2013?

Not Enough Spectrum to Operate In!




Wider Bandwidth = Higher Rates

* Graphic © Qualcomm




Higher Order Modulation

* Graphic © Qualcomm




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……




Constellation Diagram

* Images from Ruckus Wireless




Larger Frame Sizes

Throughput does not equal data rate!

* Images from Ruckus Wireless




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




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




Single User vs Multi-User MIMO




Dynamic Bandwidth Management

• 802.11ac Introduces this new concept

• Really good for channel sizes >20Mhz

•

Allows some traffic, even in adjacent channelinterference.

802.11ac Dynamic Mode

802.11n No Transmission




Minimum Receiver Sensitivity

• Loss of 7 dBm from 64-QAM to 256-QAM




Channel Planning

Note: Red Areas are Channels Not Permitted




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

+




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




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




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 willbenefit from consistent latency.




.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)




CAPsMANager

• Provides unique way to manage hundreds of accesspoints (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




Wireless AP Setting Change

• Big Changes in 802.11 Channel-Width

802.11n Device

802.11ac Device




Now 80Mhz Channels!

YA!




C vs E? Huh?

• C = Center Channel Frequency

• E = Extension Channels

•

Options are: Ceee, eCee, eeCe, eeeC

e e C e




Fastpath It!

• Improve your wireless with new hardware

queue feature!

•Changes the wireless interface to only usehardware queue, not software… Less CPU!

• Supported in V6.16+ wireless-fp




Configuration Examples




Access Point Configuration




Station Configuration




NV2 Settings – Link Encryption




Add Bridge And Allow Fast Path




Add Ports to Bridge Group




Set up Wireless Fast Path




Verify Link Connected




Tx/Rx Rate Information

Speed andChannel Size

2S = 2 Streams3S = 3 Streams

SGI = Short GuardInterval




Summary Tips:

•

Keep Signal Levels in the -40’s to -50’s, LowSNR helps keep modulation rates high

• Don’t overdrive the receiver

• Use lowest channel size the application callsfor (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!




Questions?

Live Demonstration

802.11ac intro with routeros

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