her router says G.INP in turn ON...
... do you think its possible DLM will turn off errror protection at such a short distance? rducing ping for the gaming sons?
If G.INP is on then that IS the error protection.
There's no additional delay on G.INP so no added latency.
so... while there I also i found out she is connected to an ECI cab and the ASUS is Infineon, the CAB is in the street behind hers direct opposite the home (yet her router says G.INP in turn ON)=?? thought they didnt duport G.INP?)
Infineon is the ECI cabinets chipset.
Asus use either Mediatek chipsets or the newer models use Broadcom.
They do actually support G.INP and it worked on all the Asus modems for a few years.
The Asus DSL-AC68U (and i believe other Asus models that also have a Mediatek chipset) is (or was) banned from using G.INP as something with their implementation of it was causing issues with the DSLAM.
Around the same time that Asus modems had G.INP disabled OpenReach were reporting an issue where a specific modem was causing the DLM to stop working on the entire cabinet.
The Asus's G.INP might have been what was causing DLM to stop working on these cabinets, but that's just me speculating.
It could be that the Asus G.INP problems only happened on Huawei cabinets.
It could be that OpenReach haven't implemented the block on Asus G.INP on the ECI G.INP trial.
It could also be the case that OpenReach have whitelisted the Asus modems again and G.INP could be working on Huawei cabinets again too.
Either way the Asus modems with a Mediatek chipset are in my opinion shocking performers. The chipsets are horrible.
They caused widely unstable SNRM, absolutely HUGE amounts of ES, regular loss of sync and much more when running on my line connected to an ECI cabinet.
In a relatively short time period it caused my line to be put on High Interleaving which took months to remove and required me to swap modem and to manually cap the sync speed.
The newer Asus DSL-AC88U has a Broadcom BCM63138 chipset and does G.Fast too.
Could you get a copy of the DSL Statistics page.
Even better would be to talk her out of using it if it is an older model with a Mediatek chipset.