I'm having some trouble with my sync speeds and after having read a bunch of very telco-technical geekzone threads I was wondering if anyone could provide some advice:
Line is with Telecom, ASDL provider is ICONZ (their 100GB plan). I'm using a Dlink G604T with the latest available firmware (which is from 2006). A typical sync scenario looks like this:
ADSL Firmware Version:5.00.04.00 - 5.00.03.00 - 5.00.03.00 Annex A - 01.07.2b - 0.52ADSL Software Version:V3.00B02.NZ.20060711Line StateConnectedModulationADSL_2plusAnnex ModeAnnex AMax Tx Power-38 dBm/Hz ItemDownstreamUpstreamUnitSNR Margin1515dBLine Attenuation215dBData Rate6754675kbps SNR Margin varies between 12 and 16 both down- und upstream.
Line Attenuation is quite stable and a data rate around 7000/700 kbps is quite typical. I've had up to 7500 down and 800 up before - but it varies. I've never seen ADSL2+ - like speeds of 8000 down or more. I'm in Welington/Karori, not sure if on an exchange or a cabinet and ICONZ claims (their tech support) that I have ADSL2+.
Now - I know that this is a theoretical best-case scenario, but according to the internode graph (http://iforce.co.nz/i/667e93bec35e8024c9191f1ea3e0e17c.jpg) my line attenuation indicates that I'd be around 1500-1700 meters from the exchange and on ADSL2+ could reach possible a downstream sync of 20000 kbps. Given where I live, 1500-1700 meters would be somewhere in central Karori and could well make sense for where the exchange is.
Is there a way to find out the locations of the exchanges. I've seen the Telecom Wholesale maps, but I can't see how I could deduce from that information to the location of the exchange or a cabinet.
1. I'm not even sure if the ICONZ people are telling me the truth given that I've never had speeds in the ADSL2+ range. Their website on no occasion mentions ADSL2 or ADSL2+ either. The fact that my modem syncs on ADSL_2plus modulation is from what I understand not really an indication if I'm on a plan allowing ADSL2+ speeds. Does anyone know if ICONZ even offers setups and plans that allow this speed - how can I check if they're not just telling my bullsh*t?
2. My home wiring is certainly not great an can probably do with some improvement and a master splitter etc. Fro what I can see all the line filters and splitters are applied correctly, I've done some isolation testing with all phones unplugged, the modem connecting directly (which made attaining sync speeds of around 7500 down possible more consistently). We also have an alarm (adding this a year ago or so didn't make a difference at all in SNR Margin,LA or the sync speeds I'm seeing). Is there anyone in Wellington offering a good installation and tune-up service like the user Coffeebaron does for Auckland and the Waikato? I'm not sure that a random local electrician would be up to the job from what I could read on the forums.
3. Are there any other suggestions of what I could try to improve the DSL connection speed at my place? Any help/suggestion very appreciated.