Line 1: 0116-XXX3580
Line 2: 0116-XXX6198
Line 3: 0116-XXX1171
Docs for Alex:
After taking off DLM on line 1 (0116-xxx3580), stable DS noise margin at 6db.
However, DLM ‘came back’, probably overridden by a chron. job at some point:
|Noise margins – Line 1
|Syncs (nominal – actual throughput is choked)|
|20/06/2017 – Line 1
Meanwhile, on the same bundle, and with exactly the same conditions, independently of the router used:
|A TT line at a different property, 4 miles away.|
These drop-outs are clearly due to reducing the SNR. For casual use, this might not matter too much, but for anything that relies on a consistent connection, such as security cameras, remote access or access to a NAS, it makes the service completely useless.
|DLM has finally been removed, after 3 years. This is what a healthy line looks like:|
|DS Sync||US Sync|
|DS Noise||US Noise|
|Very stable for four days – perhaps longer.|
This certainly seems conclusive – DLM has either been removed or fixed. Clearly, the decision to push lines to 3db without considering their individual suitability was a mistake.
There still remains some concern about why the DLM behaved so badly in previous months, when the ds noise target was still 6db. Until this week, it was repeatedly pushing the line(s) faster and faster, irrespective of nominal noise target, again and again, through multiple DLM resets over a period of about 40 months.
Revieved call from Talk Talk – DLM has indeed been removed. Confirmation scheduled for next week to confirm the change has stuck.