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.
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. Erik -- "Research is what I'm doing when I don't know what I'm doing." -Wernher Von Braun