Hi,
We've been working very hard with BTW over the whole issue of DLM. The trial we ran earlier in the year gave a lot of valuable data about how DLM often doesn't do the job that it was designed for. We've now got 2 pieces of work confirmed which go part way into introducing the functionality that we want.
The first is CCSNR (customer controlled SNR) which will allow us to reset line profiles to 6dB which for customer that get put on high SNR/banded profiles after having a short period of instability which perhaps they were the cause of (our test line in the office got banded this week because we've been testing out some new routers and had lots of resyncs in a short period of time) or which they know has gone away (thunderstorm or fixing wiring or a fault for example). This is due to be delivered in September
The 2nd is custom stability thresholds. For each line we currently have the choice of 3 stability options, standard, stable and super stable. Each threshold has a limit of when DLM will react in terms of the mean time between errors on the line and the mean time between resyncs. The custom option lets us set per line a different threshold of when DLM reacts, so for example we could set it so that DLM will only react if the line drops out on average once every 5 minutes. This is due in November.
It's not exactly what we're after in terms of a full solution but we are getting closer and we're still pushing for full control of DLM and BTW are still investigating this as an option.
Dave Tomlinson
Enterprise Architect - Network & OSS
Plusnet Technology
