[LINK] RFI: ADLS2+ Performance
cas at taz.net.au
Tue Jul 10 08:23:23 AEST 2012
On Thu, Jul 05, 2012 at 08:42:54PM +1000, TKoltai wrote:
> If in June 2011 they had 640,000 DSL customers and in July they had only
> 500K ports, that's a very respectable 20% floating customer base.
> In other words, a most reasonable Signal to Noise ratio.
until i read this, i thought that you're a kook but you do have a good
knowledge of the ISP industry and a reasonable grasp of the technology
but what you're saying there makes no sense. what you claim is SNR
is actually customer (or device) contention, the number of consumers
competing for a given limited resource. in this case, users:ports -
640K:500K isn't bad at all, many/most users don't leave their computers
connected all the time even with "always on" ADSL.
it is not, however, anything like or at all related to signal-to-noise
SNR refers to the strength of the SIGNAL (the useful information being
transmitted as seen by the receiver) versus the level of background
noise. i.e. it's a measure of the overall quality of the connection path
- whether that's wires or wireless.
To greatly simplify: a high SNR is "good". low SNR is "bad". too much
noise can reduce (or completely overwhelm) the information carrying
capacity of the channel.
craig sanders <cas at taz.net.au>
BOFH excuse #128:
Power Company having EMP problems with their reactor
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