1 / 24

WiFi Spectrum Analyzer for V300 series

WiFi Spectrum Analyzer for V300 series. Rev. A02. WiFi Spectrum Analyzer. Test Applications. What can the WiFi analyzer do? Portable spectrum analyzer on a USB dongle that displays all RF activity in the WiFi bands Wireless networks, cordless phones, microwave ovens, Bluetooth devices etc.

rea
Download Presentation

WiFi Spectrum Analyzer for V300 series

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WiFi Spectrum Analyzer for V300 series Rev. A02

  2. WiFi Spectrum Analyzer Test Applications • What can the WiFi analyzer do? • Portable spectrum analyzer on a USB dongle that displays all RF activity in the WiFi bands • Wireless networks, cordless phones, microwave ovens, Bluetooth devices etc. • Helps determine the best available WLAN channels quickly for optimal performance • Helps to visualize and locate RF signals in the 2.4GHz and 5GHz spectrums • Discover and remedy competing access points • Optimize WLAN networks by locating and eliminating interference sources • Target customers • Wireless IT Consultants and Professionals • A/V and Automation Installers • SMB IT Departments Confidential & Proprietary Information of VeEX Inc.

  3. WiFi Spectrum Analyzer Working Components V300 tester equipped with WiFi SA software option VeEX WiFi SA USB dongle Confidential & Proprietary Information of VeEX Inc.

  4. WiFi Spectrum Analyzer Specifications • Supports 802.11a/b/g/n networks • Supports both 2.4 GHz and 5 GHz bands • Equipped with RP-SMA antenna jack • Allows user to replace standard external Omni-directional antenna with a higher gain or directional antenna as needed. Confidential & Proprietary Information of VeEX Inc.

  5. V300 series – IP Tools Advanced Tools • The WiFi Analyzer is a compact and portable USB dongle that plugs into the USB 2.0 port of the V300 series • The WiFi SA test application menu is located in the Tools/Advanced Tools menu Confidential & Proprietary Information of VeEX Inc.

  6. WiFi Spectrum Analyzer Display Summary • Planar view • Reports current, average, and maximum signal amplitude for each wireless frequency • Topographic view • emphasizes which frequencies are the busiest across the entire spectrum • Spectral view • historical view of wireless spectrum use at a point in time Confidential & Proprietary Information of VeEX Inc.

  7. WiFi Spectrum Analyzer Planar View • Planar View • Traditional Spectrum Analyzer view with Max, Average and Current results • Displays RF activity in real time and tracks average and max values over a given period Confidential & Proprietary Information of VeEX Inc.

  8. WiFi Spectrum Analyzer Topographic View • Topographic View • Similar to a density map - plots frequency versus amplitude • Uses a special color scheme to assign colors to frequency amplitude points and to identify how often a particular co-ordinate is recorded • Great resource for identifying devices with very low duty cycles. • Leaving it running will give a good indication of the typical local network conditions. Confidential & Proprietary Information of VeEX Inc.

  9. WiFi Spectrum Analyzer Spectral View • Spectral View • Waterfall type view across the whole band – graphs amplitude levels over time. • Uses color to pick out the relative signal strength at each point in time. • Great tool for troubleshooting intermittent problems, since it highlights devices that are perhaps emitting only short bursts of noise. • For example - discover microwave oven in the kitchen interfering with WLAN. Confidential & Proprietary Information of VeEX Inc.

  10. WiFi Spectrum Analyzer RF Signatures • Signature button • presets are available to identify unknown sources of RF activity (e.g. microwave oven) • Select a device in the sidebar and click the pattern in the Topographic view to identify a device Confidential & Proprietary Information of VeEX Inc.

  11. WiFi Spectrum Analyzer Inspector - setup • Inspector button - Setup • Allows user to measure the frequency of the RF activity or interference of interest • When selected, a prompt and result box appears Confidential & Proprietary Information of VeEX Inc.

  12. WiFi Spectrum Analyzer Inspector - result • Inspector button – Result • Identifies frequency and amplitude at stylus tapping point • Current, Average and Maximum amplitude values provide an indication of level fluctuation over measurement period Confidential & Proprietary Information of VeEX Inc.

  13. WiFi Spectrum Analyzer Frequency Bands • Frequency button • Allows user to select frequency band for testing Confidential & Proprietary Information of VeEX Inc.

  14. Sales Resources WiFi Spectrum Analyzer Confidential & Proprietary Information of VeEX Inc.

  15. 802.11 WLAN standard Quick Facts • Original standard • Ratified in 1997 - used the 2.412 to 2.484GHz frequency band • GLOBAL EQUIPMENT INTEROPERABILITY • MEDIUM TO HIGH DATA RATES • APPLICATIONS • Small offices to Industrial Manufacturing campuses • SPREAD SPECTRUM TECHNOLOGY • Limits transmitted power density • Provides a robust solution in a multi-user environment • Frequency band also used by non IT applications: • 2.4GHz ISM band (83.5MHz Bandwidth) • 2.45GHz at the middle of the Wi-Fi spectrum - same frequency as the magnetron inside a microwave oven that warms up your soup Confidential & Proprietary Information of VeEX Inc.

  16. IEEE 802.11 Standard Main variants • 802.11 (Ratified June 1997) • The original version of the standard released in 1997, but is obsolete today • 802.11a (Ratified September 1999) • Uses the same data link layer protocol and frame format as the original standard, but an OFDM based air interface (physical layer). • Operates in the 5 GHz band with a maximum net data rate of 54 Mbit/s, plus error correction code, which yields realistic net achievable throughput in the mid-20 Mbit/s • 802.11b (Ratified September 1999) • Maximum raw data rate of 11 Mbit/s and uses the same media access method defined in the original standard. • 802.11b devices suffer interference from other products operating in the 2.4 GHz band - these include: microwave ovens, Bluetooth devices, baby monitors and cordless telephones. • 802.11g (Ratified June 2003) • Works in 2.4 GHz band, but uses the same OFDM based transmission scheme as 802.11a. • Maximum physical layer bit rate of 54 Mbit/s (exclusive FEC codes), about 22 Mbit/s Average throughput • Hardware is fully backwards compatible with 802.11b hardware • 802.11n (Ratified October 2009) • Improves upon the previous 802.11 standards by adding multiple-input multiple-output antennas (MIMO) • Indoor range improved from 38m to 70m (approximate) Confidential & Proprietary Information of VeEX Inc.

  17. IEEE 802.11 Standard WiFi Generations Confidential & Proprietary Information of VeEX Inc.

  18. IEEE 802.11 Standard Frequency Spectrum • Unlicensed operation governed by FCC Document 15.247, Part 15 • Spread Spectrum allowed to minimize interference • Uses mostly 2.4GHz ISM (Industrial, Scientific and Medical) band • More Bandwidth to Support Higher Data Rates and Number of Channels • Available worldwide • Good balance of equipment performance and cost compared with 5.725GHz band 902 to 928MHz 2.400 to 2.4835GHz 5.725 to 5.850GHz 26MHz 83.5MHz 125MHz 1 2 3 4 5 6 FREQUENCY (GHz) Confidential & Proprietary Information of VeEX Inc.

  19. IEEE 802.11 Standard Spread Spectrum • Definition: • Spread Spectrum (SS) is a means of transmission whereby: • The transmitted signal occupies a bandwidth much greater than the minimum necessary to send the information • Signal spreading is accomplished by a ‘code’ signal, which is independent of the data • At the receiver, de-spreading is performed by correlating the received SS signal with a synchronized replica of the spread signal • Advantages: • Resists intentional and non-intentional interference • Has the ability to eliminate or alleviate the effect of multipath interference • Can share the same frequency band (overlay) with other users • Privacy due to the pseudo random code sequence (code division multiplexing) • Disadvantages: • Bandwidth inefficient • Implementation is somewhat more complex Confidential & Proprietary Information of VeEX Inc.

  20. IEEE 802.11 Standard Frequency Allocations • The 2.4GHz radio band is split into a number of fixed-frequency channels: • There are 13 usable channels • Channel 1 starts at 2.412GHz • Channels are spaced in 5MHz increments • Channels are 20MHz wide so there’s considerable overlap between them • 40MHz wide channels exist in some 802.11n and speed-boosted versions of 802.11g • Due to this overlap, only three channels can be active at any one time • In practice users and manufacturers tend to choose channels 1, 6 and 11 (USA) • Channel 13 is at 2.472GHz • Channel 14 sits at 12MHz above channel 13 (only legal for use in Japan) • Channels 12 and 13 are illegal in the USA Confidential & Proprietary Information of VeEX Inc.

  21. f5 f4 f3 f2 f1 1 2 3 4 5 6 7 8 9 10 11 12 TIME IEEE 802.11 Standard Frequency Hopping • Principle of operation • FSK data modulation • Periodic changes in the carrier frequency spreads the signal • Carrier frequency changes at a specified hop rate • Carrier frequency hops after a prescribed time • Total system bandwidth includes all of the channel frequencies used in hopping AMPLITUDE FREQUENCY Confidential & Proprietary Information of VeEX Inc.

  22. IEEE 802.11 Standard Protocol Layer Media Access Control Layer PROTOCOL AND PHYSICAL LAYER MANAGEMENT MAC-PHY Sub-layers CONFIGURE DATA FRAMES AND PREAMBLES FOR TRANSMIT AND RECEIVE MODE Physical Layer (PHY) RADIO TRANSMISSION MEDIA FOR EITHER DSSS, FHSS OR INFRARED Confidential & Proprietary Information of VeEX Inc.

  23. WiFi Spectrum Analyzer Sales Arguments • Free Tools available to analyze WLAN issues: • Netstumbler • Wireshark • InSSider • Simply scans for valid Wi-Fi signals across the legal channel slots, but ignores all spurious radiation that affects other devices • Limitations of free tools: • Typically show information about WiFi traffic only, however blind to physical RF issues • RF physical issues are often responsible for WLAN outages Confidential & Proprietary Information of VeEX Inc.

  24. Thank you. Any questions? Confidential & Proprietary Information of VeEX Inc.

More Related