Following on from a previous article on DSL and its scientific bases, I now want to review the fundamentals of another technology: radio. As with a DSL, the ability to transmit data in any radio communications system – from the very first Marconi experiments to 5G networks – is bound by Shannon’s equation, based on the channel’s bandwidth and signal-to-noise ratio. In radio, we also have another interesting equation that can tell us the received signal strength when the transmitter power and frequency, antenna characteristics and distance to the receiver are known.
The nature of electromagnetic waves is such that anyone in a wireless network can receive the data sent over the air. With high-gain antennas, it is possible to listen in on the data that passes through an office from outside the building. That is why, right from the outset, a great deal of importance has been attached to wireless network security.
Nowadays, all offices, hotels, parks, hospitals and above all private domiciles, have Wi-Fi connectivity for laptops, tablets and smartphones. Likewise, we must consider the new lines of intelligent domestic equipment, also connected and remotely managed via Wi-Fi. There is, however, a question we all ask ourselves: how safe are wireless networks?
Nowadays, all companies provide their customers with Wi-Fi in some form or another. We find it in shopping malls, airports, restaurants, offices and even on transport. It is fair to say that Wi-Fi has become a commodity.
Nowadays, devices that are operated remotely (i.e., without local staff to verify their working conditions or act in the event of an incident) offer many services to the public.Some examples are: remote ATMs, billboards, ticket vending machines, etc. (more…)
When selecting a new Wi-Fi infrastructure, business customers are often faced with a wide range of devices. Customers with an interest in technology will always ask for equipment that meets the latest technical standards. After all, the aim is to invest in the right technology. It seems clear that the current 802.11ac standard has become the benchmark for everything. But what then are Wave 2, 2×2 MIMO, 3×3 MIMO, and 4×4 MIMO, and why is there a new 802.11ad standard. (more…)