After Zen migrate your line it remains as ADSL and you will find an option to regrade to ADSL2 in the portal. However at that kind of sync speed it might not be worthwhile unless the extra upload speed is of interest.
Agreed - generally below 6 meg you have a reduced chance of seeing faster speeds - and can even see slower speeds on ADSL2+. We generally wouldn't recommend regrading a 4.5 meg line.
regards,
Phil.
This is all fairly tricky and difficult to get to a final answer.
I have decided to take the regrade plunge, but that resulted in massive problems as my old Draytek 2800 just doesn't seem to want to play nicely with the new MSAN and its IFTN chipset. I tried various firmwares but none helped. I was able to sync at 4.7Mbps at 5-7dB SNR margin but throughput was awful with dial-up speeds much of the time. On G.GMT modulation the line attenuation was showing up as 41dB but with G.992.5 ADSL2+ it fell to 38dB. I know that the 2800 has not been great for many people so clearly it isn't really much good on my line.
I bit the bullet and decided to go for something with more chance of working, and have now installed a Draytek 2830.
This is syncing at about 5.6Mbps at present, 3dB SNR margin, and throughput is much higher although I suspect I have to do some more tweaking as the MTU is too low at present leading to fragmentation from LAN->WAN.
I'm only on day 4 of the 10 day training period so I'll see how it goes. It's clearly already much better than the older router and I have the option of using a separate modem and the ethernet WAN2 port either now or in the future (if I ever have the chance to use FTTC/VDSL with an external modem).
Thanks for your help and suggestions here.
--
Brian
Zen Active 8000