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MmWave spectrum bolsters Verizon 5G plans.
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New study shows growing strain on enterprise WAN links.
I’ve started studying for the CCNA wireless exam and thought I would put my notes online. I always learn better when writing and hopefully my notes can be of assistance to someone else. These notes are based on reading the official certification guide “CCNA Wireless 200-355 Official Cert Guide“.
Basic wireless theory
Wireless LANs are based on the 802.11 standard.
Wireless LANs is a lot about Radio Frequency (RF) and planning of the RF environment.
When alternating current is sent through the antenna electric and magnetic fields propagate out and away as traveling waves. They travel along each other and are at right angles to each other.
Electromagnetic waves do not travel in a straight line. They travel by expanding in all directions away from the antenna.
When the electromagnetic waves reach the receiver’s antenna, they induce an electrical signal.
Frequency
Frequency – The number of times a signal makes one complete up and down cycle in one second. Measured in Hertz (Hz)
The frequency range from 3 kHz to 300 GHz is commonly called RF. Types of devices in this frequency range is radar, radio, shortwave radio, television, FM radio, microwave etc. The main two frequency Continue reading
This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.
Internet of Things applications have diverse connectivity requirements in terms of range, data throughput, energy efficiency and device cost. WiFi is often an obvious choice because in-building WiFi coverage is almost ubiquitous, but it is not always the appropriate choice. This article examines the role WiFi can play and two emerging IEEE standards, 802.11ah and 802.11ax.
Data transfer requirements for IoT vary from small, intermittent payloads like utility meters to large amounts of continuous data such as real-time video surveillance. Range requirements can span from very short distances for wearables to several kilometers for weather and agriculture applications.
To read this article in full or to leave a comment, please click here
This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.
Internet of Things applications have diverse connectivity requirements in terms of range, data throughput, energy efficiency and device cost. WiFi is often an obvious choice because in-building WiFi coverage is almost ubiquitous, but it is not always the appropriate choice. This article examines the role WiFi can play and two emerging IEEE standards, 802.11ah and 802.11ax.
Data transfer requirements for IoT vary from small, intermittent payloads like utility meters to large amounts of continuous data such as real-time video surveillance. Range requirements can span from very short distances for wearables to several kilometers for weather and agriculture applications.
To read this article in full or to leave a comment, please click here