802.11ac Introduction with Mikrotik RouterOS. Brian Vargyas Baltic Networks USA MUM USA Sept 11, 2014

Transcription

1 802.11ac Introduction with Mikrotik RouterOS Brian Vargyas Baltic Networks USA MUM USA Sept 11,

2 Overview of this Presentation Brief Introduction Introduction to ac Benefits of ac over n Indoor vs Outdoor RouterOS ac Specifics RouterOS Configuration 2

3 Who Am I? Owner of Baltic Networks, your Midwest distribution partner for over 25 different manufacturers. Involved in the telecommunications industry since A ISP/WISP owner/operator for 12+ years. Dedicated to solving unique problems through innovation. 3

4 History of a/b/g (Peak Data Rates to 54Mbps) n (Peak Data Rates to 600Mbps) ac (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) 4

5 802.11ac 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 5

6 802.11ac and 5Ghz 5Ghz Band Operation Only 25 Non-Overlapping Channels (20Mhz) Introduces 80Mhz and 160Mhz Channel Sizes 6

7 2.4Ghz Stuck in 2013? Not Enough Spectrum to Operate In! 7

8 Wider Bandwidth = Higher Rates * Graphic Qualcomm 8

9 Higher Order Modulation * Graphic Qualcomm 9

10 256-QAM Requires ac 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 10

11 Constellation Diagram * Images from Ruckus Wireless 11

12 Larger Frame Sizes Throughput does not equal data rate! * Images from Ruckus Wireless 12

13 The Future - Wave 1 vs Wave 2 Today Wave 1 (Today s ac) 33% Gain Twice the Capacity 3 Spatial Streams 2015 Wave 2 (In-Testing Chipsets) Wave 1 Features 160Mhz Channels 3+ Spatial Streams MU-MIMO 13

14 MU-MIMO Transmits Simultaneous Downlink Frames to Different Clients. Significant Capacity Enhancements with many single-stream devices. Requires ac MU-MIMO clients Benefits Indoor clients with 1x1 Outdoor 2x2 operation, unknown benefits 14

15 Single User vs Multi-User MIMO 15

16 Dynamic Bandwidth Management ac Introduces this new concept Really good for channel sizes >20Mhz Allows some traffic, even in adjacent channel interference n No Transmission ac Dynamic Mode 16

17 Minimum Receiver Sensitivity Loss of 7 dbm from 64-QAM to 256-QAM 17

18 Channel Planning Note: Red Areas are Channels Not Permitted 18

19 Mikrotik ac Platforms + RB911G-5HPacD Atheros QCA x 2 MIMO RB922UAGS-5HPacD Atheros QCA x 2 MIMO RB953GS-5HnT + R11e-5HacD Atheros QCA x 2 MIMO 19

20 Outdoor Signal and Receive Sensitivity Tx/Rx Sen n RB ac RB922 MCS 7 (64qam) 24dBm/-78dBm 27dBm/-77dBm MCS 9 (256qam) N/A 22dBm/-72dBm From n -> ac Tx 24dBm to 22dBm = Loss of 2dBm From n -> ac Rx -78dBm to -72dBm = Loss of 6dBm Total Loss of TX and RX = 8dBm! About Difference of 2 vs 3 Dish 20

21 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 V S H 21

22 RouterOS NV2 Unless compatibility is required with 3 rd party devices, recommended to use NV2 protocol mode. NV2 is a TDMA mode that uses solves the hidden node problem and will scale in a much busier network. Even PtP links will benefit from consistent latency. 22

23 .ac in RouterOS V6.16 Introduced ac (July-17 th ) V6.18 Provided Minor Fixes V6.19 Improvements to NV2 and ac Wireless-FP Package (Default on.ac systems) 23

24 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 ac channels 24

25 Wireless AP Setting Change Big Changes in Channel-Width n Device ac Device 25

26 Now 80Mhz Channels! YA! 26

27 C vs E? Huh? C = Center Channel Frequency E = Extension Channels Options are: Ceee, ecee, eece, eeec e e C e 27

28 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 28

29 Configuration Examples 29

30 Access Point Configuration 30

31 Station Configuration 31

32 NV2 Settings Link Encryption 32

33 Add Bridge And Allow Fast Path 33

34 Add Ports to Bridge Group 34

35 Set up Wireless Fast Path 35

36 Verify Link Connected 36

37 Tx/Rx Rate Information Speed and Channel Size 2S = 2 Streams 3S = 3 Streams SGI = Short Guard Interval 37

38 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! 38

39 Questions? Live Demonstration 39