Steve Leytus. Nuts About Nets Bellevue, WA

Transcription

1 Steve Leytus Nuts About Nets Bellevue, WA NUTS ABOUT NETS Software company developing low-cost, diagnostic tools for troubleshooting wireless applications. Primary distributor of RF Explorer handheld spectrum analyzers in the US. Focus: Wi-Fi and Wireless Pro Audio Goals: Wi-Fi best channel (throughput) Wireless Pro Audio intermodulation analysis and frequency coordination

2 WifiMETRIX Channel Analysis WifiMETRIX Channel Analyzer Troubleshoot Wi-Fi Networks Compute Best Channel Stress-Test Wi-Fi Networks Low-Cost ($295 USD) Using the infrastructure to troubleshoot the infrastructure Devin Akin WifiMETRIX is a handheld diagnostic tool. It is an device that sees the world through the eyes of an AP (or STA). Features: 1. AirHORN ( Packet Injection / Signal Generator) 2. WifiPROBE (Channel Analysis Best Channel )

3 Why use WifiMETRIX? Allows you to be a better detective What WifiMETRIX is NOT NOT an Enterprise tool NOT used for designing Wi-Fi installations NO sophisticated algorithms for computing wave propagation, power outputs, network analysis, capacity planning What WifiMETRIX IS AirHORN channel / signal generator (i.e. source of packets and raw RF) WifiPROBE channel analyzer -- measures % Available Transmit Time of each channel IS used for troubleshooting IS used for testing IS used for gathering information in preparation for an Enterprise design IS simple to use IS low-cost ($295 USD)

4 Using the infrastructure to troubleshoot the infrastructure OSI Model 7. Application 6. Presentation 5. Session 4. Transport (TCP, UDP --Connections) 3. Network (IP -- Routing) 2. Data Link ( Wi-Fi) 1. Physical (Radio Frequency) *** IMPORTANT: Each layer is clueless about the layer above it. Layer 1 and Layer 3 tools: Can only guess what effect their metric has on performance Can not quantify effect WifiMETRIX is a Layer 2 tool (dual-band Wi-Fi chip) Uses to troubleshoot

5 What s the best channel 1, 6, or 11? An RF spectrum analyzer is a LAYER 1 device and has no concept of channels. WifiMETRIX is a LAYER 2 device and measures the performance of each channel.

6 WifiPROBE Feature (Channel Analysis) WifiPROBE Feature Channel Analysis IMMI Technology Indirect Measurement of Microwave Interference US Patent US B1 Method and device for estimating RF interference in Wi-Fi communication by measuring time delays in RF transmission WifiMETRIX is a standalone device. WifiPROBE feature performs Channel Analysis using IMMI technology. IMMI is a patented technology that employs a dual-band, chip. Relying on CCA, WifiPROBE traverses each channel and computes the metric % Available Transmit Time for each channel. Channels are ranked according to "% Available Transmit Time. "% Available Transmit Time ==> Throughput Performance Clear Channel Assessment (CCA) is a mechanism for determining whether the medium is idle or not. IMMI takes advantage of the back-off delays introduced by CCA when it detects a channel is busy (due to symbols or raw RF energy).

7 AirHORN Feature ( Packet Injection / Signal Generation) AirHORN Single Mode Traverse Mode Pulse Mode Single Mode Pulse Mode Can transmit packets or raw RF energy Traverse Mode Can be used for any Wi-Fi application that requires a source (of packets or raw RF): Rapid evaluation of receiver Testing antennas and amplifiers performance Effectiveness of RF shield designs Locating dead spots Stress-testing Wi-Fi networks Creating trouble for friends, neighbors Aligning directional antennas and colleagues

8 New Features: 1. Wi-Fi Throughput 2. DFS Testing (Dynamic Frequency Selection) -simulate radar event

9 Nuts About Nets WifiMETRIXChannel Analyzer -- with AirHORN and WifiPROBE ($295 USD)