4 ms·
Because 50 ohms is an universal standard for most radio frequency equipment, not just microwave. It (often) doesn't make sense to invent your own coax, connecto
by bcaa7f3a8bbc 7y ago
Because 50 ohms is an universal standard for most radio frequency equipment, not just microwave. It (often) doesn't make sense to invent your own coax, connectors, transformers, and chips. At the end of the day, the selection had its rational back in the days, but it eventually became an agreed convention that everyone just follows.
- whoopdedo 7y agoThe convenience of existing cables and connectors seems to be the motivation. > The first Ethernet used 9.5-mm coaxial cable, also called ThickNet, or as we used to curse it as we tried to lay out the cables, Frozen Yellow Snake. > To attach a device to this 10Base5 physical media, you had to drill a small hole in the cable itself to place a "vampire tap." > So-called Thinnet (10Base2) uses cable TV-style cable, RG-58A/U. This made it much easier to lay out network cable. https://www.hpe.com/us/en/insights/articles/the-birth-and-rise-of-ethernet-a-history-1706.html https://www.hpe.com/us/en/insights/articles/the-birth-and-ri...
- tyingq 7y ago" So-called Thinnet (10Base2) uses cable TV-style cable, RG-58A/U. This made it much easier to lay out network cable." That's not quite right. Cable TV type cable is 75 ohm RG59. I guess maybe they just mean both were coaxial and relatively flexible.
- godbyk 7y agoWell, they didn't say 'cable TV cable'. They said 'cable TV-style cable'.
- jacquesm 7y agoThe neat thing about vampire taps is that you don't need to disconnect the cable so it could be done on a running bus topology network without interruption. If you did it right...