In reply to a post by Ixel:

The Fritz!Box 7390 is an excellent modem/router for VDSL2. I am using it at the moment, though I'm having quality issues with the VOIP/telephone side of it, the DSL and networking side make up for that.

I can now alter my SNRM target rather than be stuck with what BT's DLM thinks is best (6 dB for example), and adjust some other parameters (still experimenting so I can't specifically say what does or doesn't work in that area, but I can confirm that DS SNRM target offset works fine!).

Interesting. I have never had a problem with the VOIP/telephone side of it, but my 7390 does not get as fast a connection as the BT-Supplied modem. I wonder if there are some Fritz! Box settings I don't have correct. Can you tell me what works best for you?

I see. Well as I recall the attainable rate was around a few megabits lower than what the OR modem could get, however I've noticed that there aren't as many CRC errors. I do however blame the stupidly longer Y cable supplied with the Fritzbox to be the reason why the attainable rate is lower. Is it actually possible to use a normal RJ11 cable on it (has anyone tested that)?

I've been messing around with the SNR margin offset for the downstream, via Telnet though as I have more flexibility compared to the web interface (control panel). My aim is to encourage DLM to set interleaving depth back to 1 (as close to Fastpath as possible) as a result of hardly any CRC errors and errored seconds. I haven't figured out a way to tweak the upstream SNR margin though.

As for the phone side, I got crackling noises occasionally on calls via landline and VOIP. Do you have DECT phones? I've tried mine with the router's own DECT station and the old base station in Fon0 port, both same results. I was told however that it could be a result of interference from an unshielded LAN cable (I didn't use the, apparently shielded, LAN cable supplied with the Fritzbox.

A normal rj11 lead works perfectly fine

Thanks. I'll switch back to the one I used with the OR modem in the morning, as I'm not using the PSTN phone side functionality of the router.