A week or so ago, I connected to the router to make a change and noticed that the link had only been up for 2 days and my connection was now 10/37Mbps. I figured someone had been playing around in the cabinet and this had resulted in the new connection, but was a little surprised at the loss of 8Mbps.
I checked the line details and they didn't seem to have changed ...
Line Attenuation (Up/Down) [dB]: 21.4 / 10.2
SN Margin (Up/Down) [dB]: 16.2 / 12.2
... and a reboot of the router re-connected at about the same rate.... so I rang Telecom to see whether they could shed any light on it.
After confirming that 'Yes... indeed.. I had lost 8Mbps compared to the previous few months and that indeed my Line Attenuation and Noise levels were about the same, they asked Chorus about it. The response from Chorus was...
"This customer's sync rates have decreased with the addition of new VDSL connections off the same cable terminal - this is a design aspect and the line is performing to specifications - more connections add more noise and the average sync rates will decrease as a result. We can confirm that the sync rates your customer is presently getting are in line with neighbouring VDSL connections and the line is testing good/is error free."
So ... as I read this, they are basically saying that as they connect more VDSL users, (and nothing to do with traffic volumes) the line speeds will keep reducing (even though my line noise levels haven't increased) due to 'more noise' somewhere in their part of the system. As long as the results are still above some benchmark then that is just too bad.
It feels as though as more users are added I am likely to continue to see reduced performance and, as long as I am still getting better than about 15Mbps then that is just tough.
Is this a correct interpretation of this or is there some limit to the number of additional connections that can be added to the 'cable terminal' ??
I realise that this definitely counts as a 'First World Problem' and that I should probably be happy with 37Mbps but it is a little frustrating when you know it can be better and don't know whether it might keep dropping as they add connections.
Any of the "telco wizards" on Geekzone able to shed further light on this?