Two lines side by side - very different speeds

[#1]

I have two VDSL connections - side by side in the garage - both from the same BT incoming cable - only difference being one is our "original" phone line and the other is a new line and VDSL connection. I've been puzzling on the differences for a while (new one is almost max for our cable length to cabinet). So I suspect crosstalk on the original.

Today I noticed that our cabinet got a capacity increase in 2020 - and I 'm guessing they must have swapped the gubbins internally too - as lines no longer report themselves as ECI (as we were originally) - now Broadcom. Noticed that the new line has G.INP turned on - and the old line does not.

Is it possible that the old line DLM would have survived a cabinet hardware swap? Therefore a full reset would be useful?

Any thoughts greatly appreciated 😀

[#2]

@philwelbourn  Welcome to the forum.

If one line is ECI and the other is broadcom then my bet would be that Openreach have installed a second FTTC cabinet to  increase the capacity. Whilst the original was made by ECI this new one is from Huawei. It sounds like you now have one line connected to each cabinet. ECI uses the Lantiq chipset which I understand doesn't support G-INP.

[#3]

Thanks @Baldrick1 - you made me doubt myself so I checked the DSLAM vendor on the "old" line and you are correct - still ECI - so that explains a lot - including the lack of G.INP. 

We are a small village and cabinet 3 still looks physically the same (both lines are cab 3) - so do they now add extra hardware inside - and if so - guessing that wouldn't have to match the original?

Cheers

[#4]

@philwelbourn  The FTTC cab will still be the original ECI but if you look at the associated phone cabinet (PCP) you should find an additional small enclosure stuck on the side, this is an expansion pod and contains the Huawei equipment, because it is at the PCP it makes your line a bit shorter for the FTTC broadband, your line doesn't need to go to the fibre cabinet and back again so as well as G.Inp this is also an advantage for the Huawei line. 

[#5]

Thanks @RealAleMadrid - Makes sense - we are an EO village so no phone cabs so I'll have a mooch about to have a look. Thank you.