In reply to a post by Oliver341:

Lines on Sky are normally provisioned at 4 meg. Was yours provisioned at 18 meg?

It was provisioned at 4, I got them to provision it up to 18.

Normally when they set a manual profile, DLM leaves the line alone. That's been my experience, anyway.

Here's the line being taken from 4Mb to an 18Mb profile manually:

http://www.thinkbroadband.com/ping/share-thumb/dac16...

Here's the DLM kicking in.

http://www.thinkbroadband.com/ping/share-thumb/d64a7...

Every resync is the DLM.

http://www.thinkbroadband.com/ping/share-thumb/2423f...
http://www.thinkbroadband.com/ping/share-thumb/2f404...
http://www.thinkbroadband.com/ping/share-thumb/f12d2...
http://www.thinkbroadband.com/ping/share-thumb/8d4c3...

Skipped 18th as I was playing with the line plugging it into the test socket.

It's been stuck at between 16,381kbps and 16,384kbps since DLM first kicked in with the same SNR margin after running perfectly stably and packet loss free with a higher SNR margin at over 18Mb.

Sky's DLM is misfiring, I reckon they are employing power management to save a few pence on powering lines, it's been mentioned this is likely the case.

I'm going to plug a more diagnostics friendly modem into the line and take some statistics from it. I suspect I'll see a low output power, not really the way to go if concerned about stability, lowering the transmit power so putting the signal closer to the noise floor.

The worst thing about instability is that the IP address will change if the line drops and this can mess up any downloads currently taking place.

In reply to a post by BatBoy:

The worst thing about instability is that the IP address will change if the line drops and this can mess up any downloads currently taking place.

Not anymore, uses 'real' DHCP pools delivered via the Broadband Manager rather than crazily dynamic local allocations.

Edited by deleted (Mon 20-Aug-12 16:51:56)

In reply to a post by BatBoy:

The worst thing about instability is that the IP address will change if the line drops and this can mess up any downloads currently taking place.

Surely as long as DHCP is active (on MER) the same IP will be granted to the asking MAC address. I read that DHCP leases are hourly on MER and thus renew every 30mins.

In reply to a post by jchamier:

Surely as long as DHCP is active (on MER) the same IP will be granted to the asking MAC address. I read that DHCP leases are hourly on MER and thus renew every 30mins.

I think Sky are moving ADSL2+ users back to PPPoA and reserving MER for FTTC.

In reply to a post by Oliver341:

I think Sky are moving ADSL2+ users back to PPPoA and reserving MER for FTTC.

Strange as they've already done the work and MER is more efficient use of the line and doesn't require the PPP encapsulation (and a RAS server to de-encapsulate)

In reply to a post by jchamier:

Strange as they've already done the work and MER is more efficient use of the line and doesn't require the PPP encapsulation (and a RAS server to de-encapsulate)

I thought it was strange too, to go through all the effort of rolling out new firmware for all their legacy routers and reconfigure their network, only to roll back to PPPoA, exchange by exchange.