In article <431e3c0a$0$22914$(E-Mail Removed)>,
(E-Mail Removed) says...
> My SNR upstream margin is reported at 25dB.
> AIUI, this is measured at the exchange end, and reported back to my
> modem, so it should be accurate.
> Is it as simple as quadrupling the speed to 1Mb/s upstream should
> give an upstream margin of 25-12 = 13dB or so?
Hi Ian,
I'm pretty sure you can't apply the same rule of thumb to the upstream
signal margins, as it's on a different frequency range and bandwidth (as
in width of frequency band). If the rule held, I'd be able to get 1Mbit
upstream at 3km from the exchange given the figures I get. In reality
you need to be significantly closer.
Alex