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[Bowdon]

I've noticed the thread that kitz started but I'm a little confused by some of the posts people are making.

How do I know if my line is banded?

Is banding different than DLM kicking in and implementing interleaving?

I thought banding was were the download speeds had 99 in them as mentioned on another thread. But I noticed posters to the banding thread, the figures are all over the place. there doesnt seem to be a pattern.

Is banding were DLM interleaves the line and doesnt remove it?

Sorry if these are dumb questions. But I'm sure I'm not the only one wondering how to tell the difference between normal DLM activity, which would reduce the speed for a set period and banding itself.

[Dray]

Banding usually happens on very unstable lines with huge SNRM swings. DLM sets a maximum and minimum sync speed for the line where the minimum is half the maximum. This attempts to ensure that in the event of a resync when the SNRM is poor, the line doesn't sync at a stupid low speed. The line will mostly sync at the maximum.

[Black Sheep]

When your circuit first goes 'Live', you will be on an 'open' profile ....... 128Kbps-24M (ADSL2+), 128kbps-40M or 128Kbps-80M (FTTC).

If a line fault develops for example, or REIN, or possibly switching the router off every night (Especially on ADSL), then the DLM will more than likely 'Band' the circuit ........ there are hundreds of permutations involved but by way of an example, it may band a circuit 128Kbps-13M ....... that means the EU's modem will never receive a connection speed above 13M, even if the maximum attainable possible is above this figure.

I say never, I mean DLM should relent once the fault has been resolved and should start to claw it's way back up towards the attainable rate, but we know this is as rare as hens teeth. the other way is to have a DLM reset that will basically restart your circuit as if it was day 1 all over again.

[Bowdon]

Thanks for the explanation guys!

It is a bit confusing in some circumstances as DLM might be just being slow to relent. I know interleaving got put on my line to a depth of 1235 DS and is off on US.

It's a pity we dont know how many days DLM should relent. Then we'd know for 100% if something is going wrong.

I don't think my line is banded because of the stats I get. But DLM sure takes its time to at least experiment in lifting it again. After I assume a reset of the line happened on the last OR visit I stayed on fathpath for months. My ES were in the 1000 to 1600 per 24 hours. I was under the stats kitz has on her page. Then now so far its been 25 days 1 hour and 55 minutes, not that I'm counting or anything lol.

DLM seems to be more sensitive on fibre lines I've noticed. Is this just because of the faster speeds that DLM as to be more cautious than on ADSL lines?

[Dave2150]

From recent threads on several similar forums, it appears than once your banded, DLM will not unband you. I've yet to hear of a recent situation where DLM has removed the banding limitation on a line. It appears to be a terrible DLM implementation, made worse by the fact that an engineer visit is needed to reset said DLM. Simply madness.

[Moderator edited to remove the unnecessary quotation of the entire previous post.]

[ktz392837]

How do you know if you are banded?  If you sync at 60000 and attainable is 64000 and 6db and after resync you do not connect around 64000 but around 60000 again is that a banded line? Thanks

[William Grimsley]

Quite likely, yes.

[loonylion]

How do you know if you are banded?  If you sync at 60000 and attainable is 64000 and 6db and after resync you do not connect around 64000 but around 60000 again is that a banded line? Thanks

banded profiles often sync at a rate ending in 999, eg 43999 is what my line syncs at.

[William Grimsley]

Yes, and they can be 998 or 000.

[Codescribe]

Mine was at 59993 for 12 months and then moved to 60000 after G.INP was applied.  Cannot check attainable as I have a Sky Q router but my downstream SNR is between 9.2 and 9.6 so I believe I am banded.

[kitz]

How do you know if you are banded?

As well as a constant sync rate, you also usually have quite a bit surplus SNRM.

[N0STIE]

My DS sync was 39973 with SNRm of around 11dB for like 8 months before G.INP was applied, and no matter how many times I rebooted my router it always was 39973, then it moved straight to 40000 after G.INP was applied. Does it mean I was banded too?

[NewtronStar]

My DS sync was 39973 with SNRm of around 11dB for like 8 months before G.INP was applied,

Does not sound like it your SNRm of 11dB says your sync rate would increase if you moved from 40/10 to 55/10 or 80/20 and after that the SNRm will decrease to 6dB

[kitz]

39973 is probably something to do with framing size.

Its why my line used to always sync at 79987, rather than 80000.

[Weaver]

Is 'banding' confined to FTTC?

It's a BT thing?