Yesterday I upgraded my Spark ADSL2 connection to VDSL. I was initally excited to see that my 15/1 Mbps connection was now performing at 50/10 Mbps. I woke up this morning to find it had changed to 5/2 Mbps.
A bit of digging found out that this was due to DLM. I read a few references around, including this excellent one here. However, none of it really helped to temper my expectations as to where I'll actually end up.
Is it common for the DLM process to initially try both ends of the sync spectrum before settling on a profile to use? All the Chorus installer told me was that I was currently synching at 50Mbps, but that'll improve over the next few days. He made no mention of speed dropping to 10% of that.
Or is it quite possible that my current low sync speed is a closer indication to what Chorus deems is appropriate for my connection?
For reference, here are my modem stats (using the Spark supplied Huawei HG630b):-
DSL synchronization status Up
DSL up time 06:25:09
Line standard VDSL2
Downstream line rate (kbit/s) 5720
Upstream line rate (kbit/s) 3529
Downstream SNR (dB) 37.7
Upstream SNR (dB) 24
Downstream line attenuation (dB) 11.9
Upstream line attenuation (dB) 6
Downstream output power (dBmV) 13.1
Upstream output power (dBmV) -3.7
Downstream CRC 0
Upstream CRC 7
Downstream FEC 37
Upstream FEC 665