News for hackers. Stuff that matters.

A comment on Wi-Fi over Coax.

Re:Wi-Fi over Coax by acd on Monday April 27, 2020 @11:01AM (#22996467)
Wifi over coax could have usage for trains.

You would connect wifi access point to fibre from the ground. Wifi signal is output to coax cable running along side with the power lines or from the ground next to the track. Wifi is beamed into the train. Local Wifi access points spreads the wifi signal in the train.

[ Parent | on HN ]
Re:Wi-Fi over Coax by EquallyJust on Monday April 27, 2020 @07:54PM (#23001669)
Some automated train systems already do this for control such as some of the Vancouver SkyTrain lines.

From the SelTrac wikipedia page:

"in newer versions of SelTrac, the control signal is transmitted inside the running rails at radio frequency using IEEE 802.11 (WiFi) access points. "

https://en.wikipedia.org/wiki/SelTrac#Communication

[ Parent | on HN ]
Re:Wi-Fi over Coax by neilalexander on Monday April 27, 2020 @12:49PM (#22997523)
Interference would likely be a problem here, not to mention cost. Using 4G uplinks from the trains is likely significantly cheaper.
[ Parent | on HN ]