On 05/03/12 21:13, Erik Christiansen wrote:
On 05.03.12 19:10, Allan Duncan wrote:
On 05/03/12 18:01, Erik Christiansen wrote:
The link looks more than OK: ... US Margin 27 DS Margin 21 Trained Modulation T1413 LOS Errors 0 DS Line Attenuation 54 US Line Attenuation 31 ...
Lousy attenuations. s/n consistent with 1.5Mb/s rates.
Which exchange are you on?
Belgrave, I believe, since I'm in Tecoma. Down our winding forest roads, that's a good bit further than the cocky flies - about 5 km by car. The margin of 27 dB is heaps, I'd hazard to guess, unless it's silently dropping the bitrate to maintain that "LOS Errors 0". I admit I haven't seen a BER reported, as we used to do on our PCM trunk equipment, back in the days of yore.
Ah well, I'm further along the road than you, in Upwey, but I measure it as less than 4K cable distance (I have to guess which roads have the trunks). The noise margin falls as you increase the data rate - I remember I had a similar margin to you at 1.5Mb/s.
I have a daughter on Moreland and she is also having poor performance. Internode "converted" all the 1.5Mb/s ADSL-1 over to unthrottled some months ago, and the soeeds should have gone up to 8Mb/s (max). I now get around 7, with a downstream noise margin of 6.3 dB. My daughter gets 1.5, unchanged, but hasn't chased it up. It isn't the modem - I took a spare one I had checked on my line and it also ran at 1.5Mb/s. She has much better attenuation than I do.
Is she also miles out from the exchange? The frequency response of the cable is far from flat, so high frequency attenuation suffers more rapidly from long lines, keeping us at lower speeds.
Under 2K. The modem reports margins that are what you should see. I suspect it is the DSLAM.