Interleaving on FTTC lines

Can ISPs request BT to force interleaving on or off on FTTC lines?

No - it is all decided by the DLM. An Openreach engineer can request that this be reset, which may turn interleaving off for a time, but DLM may well just switch it back on again after a day or two.

Edited by kasg (Thu 04-Oct-12 14:32:57)

In reply to a post by Anonymous:

Can ISPs request BT to force interleaving on or off on FTTC lines?

Unfortunately Isp's are given very little or no real control over FTTC connections I agree that they should be able to control things , the customer should be given the option of having their line config controlled by DLM or it being set up by their isp and DLM not used ,
short sightedness from openreach management if you ask me, requiring an engineer to reset DLM, lol Is an option that should be available to all Isp's via a control panel and done remotely

Edited by tommy45 (Thu 04-Oct-12 15:23:44)

In reply to a post by tommy45:

In reply to a post by Anonymous:

Can ISPs request BT to force interleaving on or off on FTTC lines?

Unfortunately Isp's are given very little or no real control over FTTC connections I agree that they should be able to control things , the customer should be given the option of having their line config controlled by DLM or it being set up by their isp and DLM not used ,
short sightedness from openreach management if you ask me, requiring an engineer to reset DLM, lol Is an option that should be available to all Isp's via a control panel and done remotely

indeed a huge benefit of LLU was the lack of DLM.

when I get FTTC I will defenitly want fast path and if I dont get it then tech support are in for a hard time.

In reply to a post by Chrysalis:

indeed a huge benefit of LLU was the lack of DLM.

when I get FTTC I will defenitly want fast path and if I dont get it then tech support are in for a hard time.

Can I ask why fast path is such an issue? Jitter is far more important than an extra few ms of baseline latency whatever the application, I speak as a guy who runs interactive applications, ssh, VoIP, etc, via the west coast USA on a nearly 200ms RTT link with sub-4ms jitter.

In reply to a post by Ignitionnet:

In reply to a post by Chrysalis:

indeed a huge benefit of LLU was the lack of DLM.

when I get FTTC I will defenitly want fast path and if I dont get it then tech support are in for a hard time.

Can I ask why fast path is such an issue? Jitter is far more important than an extra few ms of baseline latency whatever the application, I speak as a guy who runs interactive applications, ssh, VoIP, etc, via the west coast USA on a nearly 200ms RTT link with sub-4ms jitter.

I get 10-15ms pings with interleaving on and it wasn't much lower when the line was on fastpath so I don't really see what the probem is.

Interleaving on VDSL2 is no where near as bad as it was on ADSLx (1, 2, 2+). Unless interleaving is quite high (e.g. INP 5 or greater) pings are still quite low in my view. I'm currently on INP 3, delay 8, depth hovering around 1000, and I am getting 16ms-18ms to bbc.co.uk.

In reply to a post by Ixel:

Interleaving on VDSL2 is no where near as bad as it was on ADSLx (1, 2, 2+). Unless interleaving is quite high (e.g. INP 5 or greater) pings are still quite low in my view. I'm currently on INP 3, delay 8, depth hovering around 1000, and I am getting 16ms-18ms to bbc.co.uk.

I'm getting pings of 17-18ms to bbc.co.uk and my jitter is around 0.22ms on BT Infinity 2 - I believe interleave has turned itself on here too. Dropped from 51meg on install to 46meg and seems to be holding.

(Jitter measured by Samknows box)

Billford's BQM could be seen swapping interleaving on and off, and it happened to me once or twice on 40/10. Mostly fast path. Both on IDNet.

IIRC the difference was about 5ms, from 13 going up to 18.

Which reminds me, for a fiver I can now have a static IP again and see how mine is. Could be useful!

In reply to a post by RobertoS:

Billford's BQM could be seen swapping interleaving on and off, and it happened to me once or twice on 40/10. Mostly fast path. Both on IDNet. IIRC the difference was about 5ms, from 13 going up to 18.
Which reminds me, for a fiver I can now have a static IP again and see how mine is. Could be useful!

Yeah, the only downside of BT Infinity and Sky is the lack of static IP - and the only place I've noticed this lack is on the BQM !! Everything else I thought I used it for is happy with a DynDns.