Post Deployment Wireless Site Survey

A few days ago I conducted a wireless site survey for a Warehouse for a coffee trading company in Auckland. The motivation behind this was due to the some poor signal reports and coverage in some aisles. The list below summarises the key findings: Good overall coverage of signal especially around the corners and in…

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Wi-Fi Validation! 21 Things!

I have pen down 21 things that came to me when it comes to verifying the existing wireless validation, let’s go through them one by one. Existing Wireless – Confirm issues and problem areas. Nature of problem, impacting the type of devices, users etc? This can be done over email or call not necessary to…

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Wireless Site Survey of my home!

I have conducted my first ekahau site survey for my home and it has helped me learn a few basic things about accomplishing the site survey. Need the site plan (evacuation map or a dwg file of the site is recommended. Calculate the dimensions of the building or the facility, can use google maps for…

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CWNA, Authentication & Encryption Types

Different Authentication types Open PSK 802.1X Open Authentication – There is no authentication (Free for all). Device connects to wireless network without any issue.  Open Authentication might also redirect to a captive portal like at a Airport or Public Wireless places. There is a two way packet exchange. It is not the secure way to setup…

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CWNA – CCK,DSSS, FHSS & OFDM

CCK – Complementary Code KeyingDSSS – Direct Sequence Spread Spectrum OFDM – Orthogonal Frequency Divisional MultiplexingFHSS – Frequency Hopping Spread Spectrum There are various versions of WLAN standard developed to address different data rate and coverage requirements. IEEE 802.11b supports four data rates viz. 1 Mbps, 2 Mbps, 5.5 Mbps and 11 Mbps. – DSSS…

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CWNA , IEEE 802.11!

Hi IEEE 802.11 Key Concepts Let’s get started with the IEEE 802.11 Journey synopsis. Standards are defined at physical and mac-sub layer(data-link). We are referring to different ways of transmitting data over the air. Also how our communication signal would deliver information. One of the original ones we’ve come across is FHSS (Frequency Hopping Spread…

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What is 802.11ax

Well we first thought there are lot of acronyms in CPU naming schemes but wireless nomenclature may be even more confusing. Started with 802.11 and then got on to 802.11b/g/n/ac/ac wave 2 and then the recent one 802.11ax.  Speed – Max theoretical speed for 1 stream on AC is 866 Mb/s, AX promises speeds around…

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QAM and Modulation

Abbreviations Galore and Column Legend MCS – Modulation and Coding Scheme QAM – Quadrature Amplitude Modulation BPSK – Binary Phase Shift Keying GI – Guard Interval HT – High Throughput VHT – Very HT RSSI – Received Signal Strength Indicator BPSK – Change the Phase by 180 degrees 1 becomes 0 2 Bit Modulation Symbol…

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Wave Length and Frequency Basics

Wave Length – is the distance between 2 successive crests (peaks). Commonly, lower frequency signal will travel farther than higher frequency. 2.4GHz – 4.82 inches (12.24 cms), 5GHz – 2.04 inches (5.19 cms) Frequency – Peaks of signal, seen over a period of time. Defined in Hertz. 1 Hz = 1 cycle p/s 1 KHz…

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Wireless Site Survey Notes

Keep in mind about? Floor plan? Dimensions? Get from google earth if no info or double check Number of serving clients Ceiling Height Door (Entrance/Exit doors if apply) Material of doors/walls/obstructions etc. Location? Balanced – Capacity(numbers), Coverage Cisco Access Points : 60:1 ratio, other vendors 30:1 Use DWG for Simulated design Layers on the floor…

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