It's not NS3/NS4. At least not on 7E or 10E. Most likely all tennis have switched to fiber. At least clean feeds. What we are seeing broadcasted by Globecast for ATP are not clean feeds directly from the court so most likely all tennis is now on fiber.
Learn how global sports media firms Perform Group and WTA Media delivered live tennis action via Telstra’s global media network.
www.telstra.us.com
An article from 3.5 years ago confirming what I just said.
Yes, but for ATP we have at least the usual feed at 7 East. I'm looking the same for WTA.
The "clean feed" was never broadcasted from many many years.
So, the ATP feed that we get at 7 East is probably a relay one. The feed from the court is sent to some TV studio (it could be in the UK) where the TV guide commentary is added, then relayed at 7 East.
The same could be for WTA, so I believe that it could be NS4.
Anyone using a good meter could find it? Maybe.