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Author Topic: Advice needed - failed card now left 20mb worse  (Read 3762 times)

Chrysalis

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Re: Advice needed - failed card now left 20mb worse
« Reply #15 on: December 22, 2017, 05:30:36 PM »

Hi Guys

Apologies for the radio silence - just managed to get an engineer out to the house today.

Had a real hassle with PN around this fault - as they claimed my speed was still within the service estimate, even though the previous speed before the cabinet fault was higher. PN kept ignoring my request and statement (with evidence) that pre fault, the speed was much higher.

Anyway - the engineer attended, and could not get the attainable above 52 at my home or AT THE CABINET, and he spent probably 2 hours on the phone with someone, and in the end the conclusion is that the "new" card in the cabinet (remember it was replaced in october) was limiting the sync and that the guy on the phone could not get the line rate any higher than 52.

He disappeared for 40mins and returned saying he did a lift and shift of my line at the cab, and that the attainable is now back to where it was, up at 63Mb.

So - will be interesting to see where it settles - at least they bothered with the lift and shift - that was really appreciated.

I do wonder how many others on my cab are sitting with less than they had - he said they tried a few ports before they found one that would sync at the full speed and said that two he tried would not go over 32! (and that is physically connected to the card!).

What limiting is there on the cab outside of the profile? -   its like saying a 100Mb ethernet wont run faster than 60Mb....?


Thanks guys


David
likely its tie pair crosstalk, engineers dont have direct access to ports so a port swap is changing the tie pair you on
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j0hn

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Re: Advice needed - failed card now left 20mb worse
« Reply #16 on: December 22, 2017, 06:28:41 PM »

Personally I think your new port has a worse downstream, but a MUCH better upstream.

When he changed the port it comes with a DLM reset. This removes g.inp and applies interleaving. This means the downstream attainable is exaggerated by roughly 10%
That would make the attainable lower than it was before the swap. At least your banding is now gone.

I believe you had an engineer who didn't know what banding was. He's expecting to sync at 80Mb at the cabinet and wondering why it won't. Your line was banded though. He could try till sunset it won't sync above the banding even at the cabinet. Probably nothing wrong with the card.
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Bestgear

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Re: Advice needed - failed card now left 20mb worse
« Reply #17 on: December 22, 2017, 06:36:10 PM »

Thanks for the replies - and John - I agree he did not seem to know what banding was, even though I did give him history and some wise words (stolen from here!).

Given he was on the phone for two hours, I would have hoped that the guy he was speaking to did!

It will be interesting to see where it all goes over the next few weeks.

Thanks for the advice and guidance!

David
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