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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 1201 Mb/s. Speed depends on […]

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 – QPSK – Change the […]

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 = 1000 cycles p/s 1 […]

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 plan Remove RED background and […]

CWNA : New Things Learnt today

Cinemas jamming mobile phone signals #cinemajammers The US’s National Association of Theater Owners wants the FCC’s permission to block mobile reception inside cinemas. To be honest I thought this already happened in some places… maybe I’d mentally linked it to office buildings with Faraday cage wall structures to prevent eavesdropping on wireless data transfer; I don’t know how common these […]

4 Way Handshake

    In my own simple words  4-way handshake between a client and an access point Acronyms used: PMK – pairwise master key PRF = Pseudo Random Function AA = Authenticator Address, SA = Supplicant Address PTK = PRF(PMK | ANonce | SNonce | AA | SA) MIC = Message integrity code GTK = Group temporal key EAP-Key Message 1/4 […]

Duo MFA Security

Learnt something new today for DUO security. Any app or device can now be configured for MFA. Today i was able to get office 365 and azure login to redirect to DUO, got it working in less than 15 minutes. Quite amazing. Not sure if its so easy to configure or i am getting good at it 🙂 I am […]

Until next time….

My parents left Auckland yesterday after spending last 6 months with us. Good times really fly by faster. Feels like yesterday for the arrival in Auckland back on 15 March. We all had a great time together. Yes there were some arguments struggles and tiffs but nothing to match the good times we got in return. We went to mt […]

Skycity Level 48

Been to Auckland Skycity level 48 a while ago! The floor is an array of antenna and micro wave radios pointing in all the directions. Skycity tower is remarkably the tallest tower in southern hemisphere. Ideally it will one of the best locations to install your radio/antenna. Was quite a fascination to see the disk shaped, lamp shaped and other […]

Intune Struggle and Breakthrough

Microsoft Intune – MDM service for device configuration and enrollment. I had to struggle to get it working. First had to go through access denial stages and then later found my way through activating the Azure Active Directory P2 subscription. Some aspects worked but the MDM/Intune page still kept throwing errors. Gone Later found that we need Enterprise mobility + […]