A good indicator of how good DLM is for customer experience is the skyuser forums.

Initially sky had no DLM, then they later introduced it.

When they did introduce I had a look at their forums and looked at complaints 'before' it was introduced and 'after', from my observations the complaints were significantly higher 'after' DLM. To say its required I dont agree, user's of BE dont have major issues without DLM, and ukonline user's were mostly the same as well.

DLM is just a cost saver for the isp's so they dont have staff spending time manually adjusting settings, I also suspect its like an isp babysitting its users serving the lowest common factor working on the basis "we know better than you" ie. not wanting user's sitting on 3db margins for maximum sync rate's and then complaining of instability. DLM takes care of that mostly I expect as it enforces conservative settings. But of course not always if there is a bad enough line problem.

So I do do understand why DLM is there, but its mainly for the isp's benefit as I see it, SRA is superior in my opinion but SRA does seem to be problematic to get working and potentially would create more support headaches for the isp. So this seems about minimising support calls as especially now people cannot check modem stats without hacking modems isp's probably work on the basis user's are just happy if the connection works over anything else.

I don't know if Sky have a DLM within their own system, like BT Wholesale, but you may be confused.

On FTTC Openreach have a DLM controlling the line between the DSLAM and the end user modem. Sky FTTC users are subject to that, period, because Sky use Openreach GEA.

On the case of BT Wholesale ISPs, the BT Wholesale DLM sits on top of the OR one, but is emasculated in that it doesn't control the connection parameters in any hugely significant manner. It sets the IP Profile for throughput control, and can presumably pass through the standard/stable/extra stable parameter. I assume it can also pass through any prioritisation parameter for the traffic within the individual customer's connection which is present in the OR DLM. (I.e. VOIP and gaming over streaming and similar).

they dont on FTTC no, but they do on their adsl.

I was commenting on the theory that DLM makes end user's happier.

In reply to a post by RobertoS:

On the case of BT Wholesale ISPs, the BT Wholesale DLM sits on top of the OR one, but is emasculated in that it doesn't control the connection parameters in any hugely significant manner. It sets the IP Profile for throughput control

Won't that affect the throughput?

In reply to a post by BatBoy:

In reply to a post by RobertoS:

On the case of BT Wholesale ISPs, the BT Wholesale DLM sits on top of the OR one, but is emasculated in that it doesn't control the connection parameters in any hugely significant manner. It sets the IP Profile for throughput control

Won't that affect the throughput?

Learn to understand pwoppar gwamatickle inglish.

In reply to a post by RobertoS:

In reply to a post by BatBoy:

In reply to a post by RobertoS:

On the case of BT Wholesale ISPs, the BT Wholesale DLM sits on top of the OR one, but is emasculated in that it doesn't control the connection parameters in any hugely significant manner. It sets the IP Profile for throughput control

Won't that affect the throughput?

Learn to understand pwoppar gwamatickle inglish.

Can you answer the question?

In reply to a post by BatBoy:

Won't that affect the throughput?

Yes.

In reply to a post by BatBoy:

Can you answer the question?

Not only can I answer it, I have now also chosen so to do.

Black coffee works wonders.

In reply to a post by RobertoS:

In reply to a post by BatBoy:

Won't that affect the throughput?

Yes.

Interesting. There have been a number of reports of lines being apparently capped, resolved by an engineer's visit and the engineer calling BTWholesale to have the cap removed.

The BTWholesale speedtester has been reporting 0 Megs for the max attainable speed for about a month, too.