Ethernet cables are all often too long or too short. People on Reddit are competing to invent the shortest possible working ethernet cable. Ethernet cables are easy to crimp together yourself, and industrious folks on Reddit are currently engaged in a race to see who can make the shortest working length of ethernet. The results →
Space had too harsh weather conditions for recent Starlink communications satellite update. 40 Starlink satellites doomed: SpaceX reported last night that 40 of the 49 Starlink satellites launched to low Earth orbit on February 3 are now doomed by a geomagnetic storm. SpaceX said: “The satellites deployed on Thursday were significantly impacted by a geomagnetic →
I got some TAIYO YUDEN 9012R0 LEADED COMMON MODE CHOKE COILS FOR AC LINES and thought some uses for them. The specifications for those from datasheet were: TLH10UA 901 2R0 RoHS Common mode inductance (mH): 0.9 min. Normal mode inductance (mH): 0.067 DC resistance: 0.089 Rated current (A max): 2.0 Rated voltage AC (V max): →
Ethernet over twisted-pair technologies use twisted-pair cables for the physical layer of an Ethernet computer network. Most commonly standards use 8P8C modular connectors (often called RJ-45), and supported cable standards range from Category 3 to Category 8. These cables typically have four pairs of wires for each connection, slower standards (10M and 100M) used only →
Who invented that and decided that it was a good idea to start to use this 10 pin RJ-45 look-alike connector? I wanted to do measurement with multimeter on UTP wiring, took a cable (left) that looked like RJ-45, but nothing worked as planned with it. Ended up butchering a real CAT6 cable (on right) →
At some point this year, email turned 50 years old! In 1971, Ray Tomlinson sent the first email using the SNDMSG program on ARPANET. 50 Years of Email https://www.prnewswire.com/news-releases/50-years-of-email-301262676.html But if the history of email tells us anything, it’s that email isn’t going away any time soon Email is 50 years old, and still where →
LANtenna hack spies on your data from across the room! (Sort of) post tells that Mordechai Guri from the Ben Gurion University of the Negev (BGU) in Israel has recently published a new data exfiltration’ paper detailing an unexpectedly effective way of sneaking very small amounts of data out of a cabled network without using →
I saw this cable tracer equipment in use few days ago connected to a telephone cable. Here is the device connected to the cable. Closer view of the device reveals code CTT45 type code and manufacturer name VESALA. It is a product made by a Finnish company VESALA. The CTT45 is the transmitter part of →
Monday October 2021 was an Internet outage day. Many Facebook users faced outage and felt they had “internjet” instead of Internet. Also ePanorama.net has few hours outage. ePanorama.net went down few hours earlier. When I got my server up, in few hours Facebook was able to get their site up. Interesting correlation, but correlation does →
Usenet is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Basically format and transmission of Usenet articles is similar to that of Internet e-mail messages. Usenet started to operate at 1980 and I started using it in 1989. Users read and post messages →