Traditionally, an optical communication system would require two components at each end: transmitter and receiver. It has been known that LEDs can act as photo sensors, but they have not been very practical for optical communications applications. Researchers have now shown switching between LED and photodetector modes on new type component quickly enough for real-time →
TV transmitting tower with microwave links and other telecom stuff like cell phone transceivers covered with snow. This is 150 meters tower that has typically 100-150 thousand kilograms of snow and ice in it during winter time. This picture was taken few days ago at Ylläs Lappland Finland. Picture is taken by me in February →
This posting is here to collect cyber security news in April 2020. I post links to security vulnerability news with short descriptions to comments section of this article. If you are interested in cyber security trends, read my Cyber security trends 2020 posting. You are also free to post related links to comments. →
We are living in the middle of the emergency over coronavirus all over the world. The reactions to the COVID-19 pandemic and its effects on societies and economies around the world cannot be understated. Because an estimated 15% of COVID-19 patients require hospitalization and 5% require intensive care (Z. Wu and McGoogan 2020), the ongoing →
I am living in the middle of the emergency over coronavirus in Finland. Due this reason the update cycle to make posting to this blog could be slowed down. The Finnish government announced on Monday nationwide school closures in order to help prevent the spread of coronavirus. Read more on the following aricles: Finland closes →
Some countries are just setting rid of phone booths and wired telephones, while Finland is on the way to get rid of 3G mobile networks. The biggest Finnish mobile phone operator Elisa has decided to shut down their 3G network in the end of 2023. Other big foreign operators working in Finland are Telia and →
Signal processing is an electrical engineering subfield that focuses on analysing, modifying and synthesizing signals such as sound, images and biological measurements. Electronic signal processing was first revolutionized by the MOSFET and then single-chip digital signal processor (DSP). Digital signal processing is the processing of digitized discrete-time sampled signals. Processing is done by general-purpose computers →
A signal generator is an electronic device that generates repeating or non-repeating electronic signals in either the analog or the digital domain. These generated signals are used as a stimulus for electronic measurements. There are many different types of signal generators with different purposes and applications. For analogue signal generation I have used for very →
Yet another bad sounding Intel processor security vulnerability is released and this could be big again. Little over two years ago I wrote about Meltdown and Spectre, and posted links to some following vulnerabilities. Now an article Intel x86 Root of Trust: loss of trust from Positive Technologies details a new vulnerability. Researchers at enterprise →
This looks like a nasty vulnerability. It seems that a newly found critical 17-years-old remote code execution (RCE) vulnerability could open nearly all popular #Linux based operating systems and many embedded devices to remote hackers. Many widely-used Linux distributions have already been confirmed impacted. Hacker news writes: The US-CERT today issued advisory warning users of →