WLPC Phoenix 2016 Engaging ways to discuss Wi-Fi Doug Fravel Global Training doug.fravel@adtran.com @DougFinAL, Inc. All rights reserved. Ten Talk - Engaging ways to discuss Wi-Fi In 2015 committed to conducting free 1 day RF planning and design workshops in 12 major cites - Very popular - grew to 30 cities and 10 NSP Camps - Well over 600 partners/nsp/customers trained In this Ten talk, we will discuss demonstrations and other techniques that helped make the event engaging and popular. Bullets and comments in red are the highlights that I plan to discuss here at WLPC., Inc. All rights reserved. WLPC Phoenix 2016 1
Workshop Objective Topics covered - vwlan and ProCloud Feature Summary - Essential steps to a successful wireless deployment - Defining requirements for a wireless network - Performing initial surveys and walk through - RF Propagation and Signal Loss - Introduction to 802.11 Wireless Networks - RF Units of Measurement - Antenna Fundamentals - Designing for coverage and capacity - Deploying and verifying the Wireless Network - Ongoing management/troubleshooting of a wireless network - Introduce and demonstrate industry tools Audience: Technical and sale professionals who need to be fully informed as they plan and deploy wireless network. - VARS, NSP, Sales and Sale engineers, techs, installers, business owners, Inc. All rights reserved. Challenge outside of WLPC So how do you make Wi-Fi sexy and interesting for technical and non-technical folk? Easy to do at WLPC #WLPC PHX 2016 #WLPC PHX 2016 #WLPC PHX 2016, Inc. All rights reserved. WLPC Phoenix 2016 2
Let s have some fun with Bluey Do you remember Bluey? made famous from the Wi-Fi Awesomeness YouTube video? Bluey www.youtube.com/adtraninc When you see Bluey during presentation, first person to raise hand and shout receives a prize, Inc. All rights reserved. 2.4 GHz Non Overlapping Channels In the United and Canada there are only 3 simultaneous nonoverlapping channels - Channels 1, 6, and 11 Regions where 13 channels are used there are different simultaneous nonoverlapping channel combinations - Channels 1, 6, 11, or 2, 7, 12, or 3, 8, 13, or 1, 5, 9, 13 - Channels 1, 6, and 11 are typically used in other regions also 5 MHz Used Bluey on key slides to make sure I had their focus. It was fun too 1 2.412 2 2.417 3 2.422 4 2.427 5 2.432 6 2.437 7 2.442 8 2.447 9 2.452 10 2.457 11 2.462 12 2.467 13 2.472 14 2.484 22 MHz 2.4 GHZ ISM Band, Inc. All rights reserved. WLPC Phoenix 2016 3
Successful Wireless Deployment? What is a successful wireless deployment? - The wireless network works in most areas and most of the time? - Users accessing the network are not complaining about the network? A goal of a successful wireless deployment would be: The wireless network performs as designed based on the defined requirements collected from the customer Success!!! Maybe not, Inc. All rights reserved. Why the extra thought with Wi-Fi design? 1. The Wi-Fi signal that goes between the clients and the APs is impaired by stuff that s in the way (including air) - Does the signal reach client with sufficient strength to allow a connection or decent throughput 2. An AP s available bandwidth is shared among all the clients that are connected to one of its radios - More clients means lower throughput for everybody - Need to have enough APs in a coverage area to handle the capacity (number of users and application) 3. Other devices operating in the 802.11 frequency range can interfere with and degrade the performance of the Wi-Fi network My first demo was done here to draw them in, Inc. All rights reserved. WLPC Phoenix 2016 4
RF Interference Demo Demonstrated live phone call taking out 2.4 GHz In this example, AP placed on channel 1 My laptop was associated to 2.4 GHz SSID Played live video (Earthcam) Received phone call on 2.4 GHz phone - I used Magic Jack Video and Wi-Fi connection lost 2.4 GHz Ch 1 Live Video Magic Jack VOIP Adapter 2.4 GHz Cordless Phone, Inc. All rights reserved. Set the Expectation for WLAN Explain that wireless networks are very different than wired ones Wireless is a shared medium - The number of client transmissions, non-wi-fi RF transmissions, and environmental factors affect wireless performance - There is a good bit of overhead that affects actual throughput Devices will have different connection types and capabilities - All clients will not have the same wireless experience Good discussion about 2 people sitting next to each other in conference room. Held up two Androids: one 65 Mbps Max line rate, on 867 Mbps max link rate., Inc. All rights reserved. WLPC Phoenix 2016 5
RF Shared Medium Exercise/Demo Iperf is a tool that can be used for network throughput testing - JPerf is a Java-based GUI version of Iperf To measure throughput of the wireless connection 1. Connect PC to switch port and run Iperf (JPerf) server 2. Connect AP to same switch (same VLAN) 3. Associate a wireless client to SSID and run Iperf client - iperf c 10.10.20.250 - i 1 t 10 -i 1 (report every second) / t 10 (transmit for 10 seconds) Passed around tablets and had each connect one at a time Iperf Clients JPerf server 10.10.20.250, Inc. All rights reserved. SSID blue24 Wi-Fi Scanners for Walkthrough (Demo) Wi-Fi Scanners are inexpensive (or free) software applications that allow you to easily identify wireless networks in your area Useful for quick on site survey of wireless networks in use - Identify available wireless networks (access points) - Identify signal level, security settings, and channel use - Can use to note signal level on map during walk through Android Again, passed around tablets. Windows or MAC Apple Numerous Wi-Fi scanners available, Inc. All rights reserved. inssider from Metageek AirPort Utility WLPC Phoenix 2016 6
RF Introduction In the upcoming sections, we will introduce RF Propagation, RF signal loss, the Electromagnetic Spectrum, and then work our way to 802.11 wireless networks Did not want sales guys walking out of the room. We don t want this to be you Goal of this section is a basic understanding of the RF medium to aid in the design, verification, and troubleshooting of wireless networks, Inc. All rights reserved. Access Control on Wireless Network A Station will only transmit if it thinks channel is clear - All other stations are waiting Tried to visually demonstrate where possible. TX 2.4 GHZ Ch 1, Inc. All rights reserved. WLPC Phoenix 2016 7
Co-channel Interference (CCI) Co-channel Interference (CCI) occurs when two or more access points (APs) share the same frequency channel - Shared medium APs and clients have to wait longer to transmit A few examples TX 2.4 GHZ Ch 1 2.4 GHZ Ch 1, Inc. All rights reserved. Channel Planning Proper channel reuse design will minimize medium contention overhead A few examples TX TX 2.4 GHZ Ch 1 2.4 GHZ Ch 6, Inc. All rights reserved. WLPC Phoenix 2016 8
Adjacent Channel Interference (ACI) With the 2.4 GHz band, the 802.11 standard requires 25 MHz of separation between the center frequencies Adjacent channel inference occurs when there is not 5 channels of separation A few examples TX 2.4 GHZ Ch 1 2.4 GHZ Ch 2, Inc. All rights reserved. Adjacent Channel Interference Adjacent channels, such as 1, 2 and 3, use the same RF Spectrum and will interfere with one another - Transmitted frames could become corrupted - Receiver will not send ACK - Retransmissions will increase And here s bluey again. It drew their focus every time and made it fun. 1 2.412 2 2.417 3 2.422 4 2.427 5 2.432 6 2.437 7 2.442 8 2.447 9 2.452 10 2.457 11 2.462 12 2.467 13 2.472 14 2.484 2.4 GHZ ISM Band, Inc. All rights reserved. WLPC Phoenix 2016 9
Antenna Concepts Radiation Patterns Antenna Radiation Patterns display the variation of the power radiated by an antenna Held up Omni and patch to visualized how it would light a room E-Plane Pattern (Elevation) H-Plane Pattern (Azimuth), Inc. All rights reserved. WLAN Design Based on preliminary site discussions, interviews and walk through: Determine how many APs are needed - Design for coverage and capacity Decide the optimal channel and power for both radios on each AP Identify where the APs and antennas will be installed Define other radio or AP settings needed for optimal performance, Inc. All rights reserved. WLPC Phoenix 2016 10
Planning for Coverage (Demo) Factors that go into signal coverage and AP placement: Used planning software to demonstrate how far signal travels at low power (2.4 and 5 GHz) and then added wall obstruction. 2.4 GHz 2.4 GHz Drywall 3dB 5.0 GHz 5.0 GHz Concrete 12 db Generic 2.2 dbi Omni, 8 ft. Ceiling, TX: 10 mw,, Inc. All rights reserved. Planning for Capacity Factors that go into capacity planning and AP placement: - Number and types of clients and radios Use the defined site requirements - Types of applications Use the defined site requirements - Etc For capacity planning we worked examples and demonstrated a couple capacity planning tools., Inc. All rights reserved. WLPC Phoenix 2016 11
Streaming Video Bandwidth Examples Went to the source for those who needed proof YouTube Connection Speed Recommendations YouTube 240p YouTube 360p YouTube 480p YouTube HD 720p YouTube HD 1080p 0.4 Mbps 0.75 Mbps 1 Mbps 2.5 Mbps 4.5 Mbps https://support.google.com/youtube/answer/2853702?hl=en Netflix Connection Speed Recommendations Minimum 0.5 Mbps Low quality 1.5 Mbps SD quality 3.0 Mbps HD quality 5.0 Mbps Ultra HD (4K) 25 Mbps https://help.netflix.com/article/en/node/306 Apple TV Connection Speed Recommendations SD quality 2.5 Mbps 720p content 6 Mbps 1080p HD quality 8 Mbps http://support.apple.com/en-us/ht203422, Inc. All rights reserved. Predictive Site Survey Demonstration The Predictive Site Survey allows you to model the wireless environment pre-installation and off-site Demonstrated funnel effect in hallway, manual AP placement, and auto AP placement., Inc. All rights reserved. WLPC Phoenix 2016 12
Spectrum Analyzer/Wi-Fi Scanner Difference Wi-Fi Scanners display signal level and channel use Spectrum Analyzers display the raw RF signals Both illustrations below were a capture at the same time and location Spectrum Analyzer Demonstrated the difference. Wi-Fi Scanner, Inc. All rights reserved. Spectrum Analyzer Demonstration Spectrum analyzers capture and display the raw RF signal In this demonstration we will use Chanalyzer with the wispy DBx adapter Placed the phone call again 2.4 GHz Cordless phone, Inc. All rights reserved. WLPC Phoenix 2016 13
Wi-Fi Design and Support Network Design Engineers are available to answer any Wi-Fi design questions you may have Numerous Wi-Fi design documents posted in the Support Community Introduction to Wireless LAN 101 CBT available in University Can also reach out to your local sales team for assistance Ended the session pointing out resources, Inc. All rights reserved. Other Wi-Fi Design Resources CWNP Certified Wireless Network Professionals - Vendor neutral Wi-Fi certifications www.cwnp.com - CWNA - Certified Wireless Network Administrator The CWNA certification is the foundation level enterprise Wi-Fi certification for the CWNP Program - CWDP Certified Wireless Design Professional The CWDP certification is a design focused professional level wireless LAN certification for the CWNP Program Ended the session pointing out resources, Inc. All rights reserved. WLPC Phoenix 2016 14
Other Wi-Fi Design Resources No Strings Attached Show Podcast - The NSA Show is a vendor neutral look at all things wireless - nostringsattachedshow.com/ wirelesslan Professionals www.wlanpros.com - Great resource for Wi-Fi discussions, videos, podcast, and links to numerous Wi-Fi bloggers Ended the session pointing out resources, Inc. All rights reserved. Doug Fravel Global Training doug.fravel@adtran.com @DougFinAL, Inc. All rights reserved. WLPC Phoenix 2016 15