Yuck, is my first comment on your Hlog plot. My second comment is that the plot displays the typical ECI equipped cabinet "tail-end droop" (a sudden increase in attenuation at the highest frequency sub-carriers).
Indeed, the tail end droop disappeared ish when I did a re-sync though.
Well, engineer has been, did all he could but he was just a phone engineer (not a broadband one). I was told I need a broadband engineer, and was advised to contact Zen again and ask for one. He feels it could be a faulty port on the DSLAM but being a phone engineer he doesn't have access to it. I mentioned a circuit recalc to prove the CRC errors were still there (being masked by FEC errors) but I don't think he had the training or access to do that (he thought the ISP could do it, but I said I thought it was only the Openreach engineer who could).
So, I will be contacting Zen again to inform them of the situation. In the meantime the only way I feel I can prove the CRC errors are still there is if I forcibly cap the downstream speed on the modem to say... half what it is now (as I will eventually get fastpath back). Zen on the other hand might not like this or might wonder what I'm up to. Anyone have any suggestions on how I should proceed? Thanks in advance.
Finally I have no idea if I'm being charged, I hope not. He said he didn't mind this type of fault as it's an easy job for him (of course, haha), so as long as I don't get charged for 'no fault found' I won't mind.
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EDIT: I've had an idea. Maybe I should get a second line (my drop wire is capable of four lines I think). This would rule out the idea of a faulty DSLAM port without potentially costing me a lot for call outs. If it turns out there's still a fault then, as I'd go with A&A for this second line, I could get them on to the case unless of course the installer finds there's instability the moment he connects it up (FTTC). If on the other hand there's no fault then I'll just have to class Zen as a backup connection for the remainder of the contract. Maybe I should do that?
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EDIT 2: I've just had a call from Zen, obviously stating what I already know about today (no fault found) and there is a charge but I'm being told that it's not my concern as Zen never agreed with BT/Openreach about a possible call out charge for this particular call out so they'll dispute that (phew!). They're going to now deal with the packet loss problem and move me to an assured peer or something I think they said. However I think what I've mentioned in the first edit may be my best option to getting this tackled, and perhaps at the end of the contact with Zen just stick with A&A from that point on only (while keeping Zen for voice phone line rental). Any thoughts anyone?