Taken from our chief engineers quarterly publication.
"Each night, the DLM system uses the previous 24hrs of circuit performance data to ascertain whether the mean time between errors or excessive retrain thresholds have been breached on a line. If they have, DLM will place rate caps, interleaving or both, on the line to improve error rate, stability, or both, by the change of its line profile."
IF you have a line fault, as you are under the impression you have from the engineers comments, then you may end up on a never-ending merry-go-round. I can't see why you are avoiding a simple copper line-test by your ISP ??
Interesting, I see. It's good to know then that the cap is on my line for some other reason, other than me assuming that DLM had frozen on my line. It was very strange to see no interleaving, but as you've quoted, basically DLM doesn't always apply both, it can apply either a capped rate or interleaving.
Hmm, well the only reason was I didn't think it was necessary for me to ring and potentially waste time for both the operator and myself. As it was, shortly after the engineer left, I tried getting them to perform a reset on the DLM but after performing some tests (presumably the copper line test you mentioned) and getting me to perform a speed test on the BT Wholesale website, they refused stating I was getting the minimum estimated speed and that Openreach would just tell them the same thing if they made the request for me.
Given I'm currently getting the minimum estimated speed still then BT Business will probably just say that again, even though I know I can achieve more (but I can't exactly say or prove this as the modem is supposed to be locked down, so can only say what the engineer said when he used the JDSU)?
If I use the HG612 my attainable rates are around (currently) 93Mbps down and 28.5Mbps up. If I plug in the ECI the attainable rates were originally (after the fault was semi-resolved) around 93Mbps down and 21Mbps up, if I plug it in now though they appear to be around 88Mbps down and 16.5Mbps up. So although the HG612 attainable rates haven't gone down since the fault was semi-resolved, the ECI attainable rates have, so I can only assume it's a problem with the ECI modem. In the meantime I've put back on the HG612, though it's not ideally the choice to use as the cabinet hardware is ECI. I suppose I could buy another cheap ECI modem off eBay and check that.
I'm one who, where possible, doesn't like to waste time for either the company or myself. Though perhaps that's not a good thing and I should actually be more pushy on matters such as getting DLM reset so the cap is removed. I did have intentions on ringing BT Business again roughly a month after the engineer was last here if the same cap was still in place, allowing ample time for DLM to do something.
Well, I'll give them a call based on what you've said, but before I do just one last question if you don't mind
. Do you think I should get them to perform the copper line test with the HG612 modem connected or the ECI modem connected, or in your opinion will this make very little difference?
Thanks for all the help.