CWNA – Chapter 1 Summary & Exam Essentials

Overview of Wireless Standards, Organisations and Fundamentals. 4 Key organisations involved with wireless networking industry – FCC and other regulatory domains (ITU-R (ACMA (Australia)) (ARIB(Japan)) – FCC regulates communication from/to/within US. Both licensed and unlicensed communications are typically regulated in the following 5 areas  – Frequency, Bandwidth, Maximum power of the intentional radiator (IR),  Maximum…

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WiFi Metrics

I am going to pen down a few of the important wireless metrics. This is to access the environment for any concerns and issues raised around the wireless side of things. So what should we consider a good, acceptable, or poor Wi-Fi signal strength? -30 dBm – Maximum signal strength, you are probably standing right…

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Wireless Optimization Tips!

 I have taken into account for a general hospital system where “patient tracking” application is used by doctors and nurses to capture/update patience information.  Patients/Visitors use wireless for their private use along with other hospital staff using wireless network for their day to day work chores. In some instances there might be IoT devices which…

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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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Keying Methods

– Amplitude Shift Keying – Frequency Shift Keying – Phase Shift Keying – on-off Shift Keying Fundamental to all wireless communications is modulation, the process of impressing the data to be transmitted on the radio carrier. Most wireless transmissions today are digital, and with the limited spectrum available, the type of modulation is more critical…

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