Max. distance from the socket to the Internet Box 3

As long as you want. Just needs a decent cable.

@Macro09

There are different opinions!

[https://community.swisscom.ch/t5/Archiv-Internet/Kabel-verl%C3%A4ngern-vom-Router/td-p/336179](https://community.swisscom.ch/t5/Archiv- Internet/cable-extension-from-router/td-p/336179)

Then the question is whether extending the route BEFORE the router is a good idea. The decisive factor is always what distances we are talking about here.

Especially with g.Fast the speed of the line decreases disproportionately with length, see orange curve here: https://www.linkedin.com/pulse/supervectoring-explained-brandon-doyle - The decisive factor here is the distance from the mCAN to the router*. I would therefore place the router close to the UP and then do the in-house distribution via network cable. This way no speed is lost.

Example constellation: The router is somewhere close to the UP socket, from there it goes to a switch and then distributed throughout the entire apartment (with network sockets in all rooms or via WLAN boxes).

*By the way, this is also the reason for deviations between checker and reality. Swisscom knows the cable lengths up to the UP. But if there is an exaggerated 200m of high-rise in-house installation behind it, this is not included in the calculation…

Everything @StefanSch wrote was perfect.

As an information: When calculating the speed, we always include 30m of in-house cabling between the UP and the router. This is a CH average, which has been determined from the various MELT measurements (analog history, which can be used to measure electrical length) over the years. In addition, we round down the speed, which is why the information in the checker is rather conservative (in 85% of the lines it is exactly correct).

And with g.Fast (19.4 - 106MHz) you can actually calculate the loss from this 30m linearly to the length. As a general rule, I would say that for every meter of cable length you waste 1 mbps of performance in the DS. The lower the line quality (in-house, between UP and mCAN), the steeper the line for the drop in performance, but this simple calculation works well.

With VDSL/Vectoring (2.2 - 17MHz) the drop in performance is significantly lower, around 1mbps over 20m. But here too, of course, it always depends on the cable quality and, above all, the in-house cabling. The most common causes of poor speed are still BridgedTaps and corroded connections (UP, sockets).