VDSL2 connection has been extremely slow since the storm and remains extremely slow

Markus512 · Jul 25, 2022

VDSL2 connection has been extremely slow since the storm and remains extremely slow

Hello everyone

For a few weeks, there was lightning and thunder and my internet had a very small outage.

Since then, Swisscom has imposed an SNR margin of 18.4 dB on me downstream and my data rate is now 66,790 Mbps instead of over 100 Mbps. Have you ever experienced something like that?

Is there anything you can do to get a reasonable line again? It previously ran without any problems for months, even with a much lower SNR. Why is there such an overreaction?

Best regards

Mark

WalterB · Jul 25, 2022

@Markus512

What does the checker show at your address?

https://www.swisscom.ch/de/privatkunden/checker.html/

Werner · Jul 25, 2022

I’m not sure whether Swisscom specifies a target noise ratio on the network for pure VDSL2, but no matter what exactly it is, the right one for your question is definitely @Roger G

If he currently has time, would he perhaps take a closer look at your values online?

hed · Jul 25, 2022

@Markus512

If not already done, please restart the IB (power off / wait 10s / power on).

If that doesn’t help, you can open a problem ticket here:

Tel. 0800 800 800

or

Private customers: Contact via hotline, chat, message | Swisscom

krypton · Jul 25, 2022

Yes, unfortunately I know that all too well: absolutely stable connection when the weather is nice, constant interruptions when it rains. In my case the cause is obviously to be found in overhead lines.

The speed has been massively reduced step by step, from the initial 133,000/52,000 to 74,000/23,000 Kbps (SNRM 24.0/23.0).
When it rains, the speed, especially the upload, is further reduced for a short time, sometimes down to a few 100 Kbps. Unsightly, but at least there are only interruptions in strong storms.

Does the line also come into your house above ground?

In your case, the system stabilized the line, but did it overreact? Theoretically, if the connection is stable, it should correct upwards again. I don’t know how long this happens, because I haven’t noticed any increase in the connection mentioned above in the last few months.

Lori-77 · Jul 25, 2022

Hello everyone @krypton @Markus512 It always depends on what type of overhead line wire was stretched.

There are now 4 different types of cables.

It also depends on what type of fuse you have in the house. An ancient black box or the narrow gray ones…

And it also depends on what kind of distributor is on the overhead line. Whether it is soldered or new

It could also be quite possible that your line to earth is short-circuiting.

But only a technician on site can determine this.

Greetings Lorenz

Markus512 · Jul 25, 2022

Hello Lorenz, it will probably be something like that. Old overhead line here. It’s not that bad if it breaks down.

But what always annoys me terribly is that Swisscom reduces the speed so aggressively.

And what makes it even worse is that it only recovers after I replace the good Zyxel modem, which supports bridge mode, with the unsuitable IB with tons of port forwardings for a few days. It should be possible to just leave it as it is. Especially if it works at good speed for several months in between.

Markus512 · Jul 25, 2022

Currently:

The availability check is currently not possible for technical reasons. However, you can still configure your offer and remember your selection.

But as I remember it, about 100Mbit down and 30 up.

Markus512 · Jul 25, 2022

Yes, if no other solution can be found, I will dig up the IB, hang it up for a day when I’m not at home and then, when the speed is ok again, replace it with my modem. It’s just inconvenient, but as an emergency solution, yes.

kaetho · Jul 25, 2022

Why “lots of port forwarding”? This is more convenient via DMZ, then practically everything is forwarded to the downstream router 😉

hed · Jul 25, 2022

@Markus512

Why should the IB be unsuitable?

Markus512 · Jul 25, 2022

Somehow the attitude didn’t work at all back then. Then as an alternative, port forwarding. Some ports could not be forwarded. Therefore there are relatively many areas to get at least everything that was possible.

But that was several years ago. Then I just stopped trying because it worked without any problems with the Zyxel XMG3927-B50A. It may be that the DMZ has now been repaired. But it’s not that difficult with the bridge. Swisscom really sticks to standards. (Of course, option 60 must be set correctly on the DHCP client.)

But I don’t see any reason why the Zyxel should be slower. Uses practically the same chips. And after the remote station has been trained with the IB (speed up again) it then continues to run at high speed for several months or years (until something happens).

After a few experiments, it seems to me that there is a distinction somewhere: IB => we also adjust towards faster, third-party routers => we only regulate towards slower. But maybe I’m wrong. It doesn’t happen that often.

Markus512 · Jul 25, 2022

Missing bridge mode. I really just want to have a modem in there and not a router behind another router.

kaetho · Jul 25, 2022

@Markus512 wrote:

….

After a few experiments it seems to me that there is a distinction somewhere: IB => we also adjust towards faster, third-party routers => we only regulate towards slower. But maybe I’m wrong. It doesn’t happen that often.

That could be a good thing, the way you write (or at least the way I interpret it) neither the Zyxel nor the IB is up to date in terms of hardware.

But a lot has happened in terms of speed utilization on copper in recent years. Maybe an update would be worth it?

Regarding the lack of bridge mode: do you have any specific restrictions because of it?

Markus512 · Jul 25, 2022

In terms of speed utilization when you’re too far away for g.fast, in my opinion not much has changed.

I also think that my interruptions are due to the fact that the overhead line is temporarily (fortunately rarely) almost completely gone (at least for slightly higher frequencies) and there isn’t much that can be done with newer technology. (If someone were to replace this copper cable with a fiber optic cable, of course I wouldn’t say no.)

Regarding the IB. If the DMZ mode now works, which I actually assume it does, realistically speaking, nothing more. She would probably go too. It’s just not my preferred solution.

hed · Jul 25, 2022

@Markus512

So it looks like you now have the choice between the “loved” Zyxel with reduced speed and the non-preferred IB with the maximum possible speed.

Werner · Jul 25, 2022

So the fact that there should now be an automatic stabilization mechanism in the event of disruptions in the Swisscom network, which should treat third-party routers in a discriminatory manner compared to Swisscom’s own routers, I now consider to be purely a rumor for which there are no verifiable facts as yet.

I suspect @Roger G could make a very clear statement about this.

hed · Jul 25, 2022

@Werner

Certainly nothing and no one is specifically discriminated against, but it is quite possible that after automatic stabilization, depending on the router or DataPump used there, it will take more or less time for technical reasons until the original speed is reached again. Depending on the quality of the DataPump used, in my opinion it is also possible that the speed that can be achieved varies.

WalterB · Jul 26, 2022

@Markus512 wrote:

Currently:

The availability check is currently not possible for technical reasons. However, you can still configure your offer and remember your selection.

But as I remember it, about 100Mbit down and 30 up.

Does the link below not work either?

https://www.swisscom.ch/de/privatkunden/checker/checker-popup.html

Markus512 · Jul 26, 2022

Hello WalterB, thanks for the link. So the current data:

Max. 120 Mbit/s download and 28 Mbit/s upload available

Max. 620 Mbit/s download and 78 Mbit/s upload with the Internet-Booster

I don’t have Internet-Booster. The 28 Mbit/s upload is actually higher, like 35. At times it was around 40.