I'm at the final stages of summarising our local campaign for a broadband network for our area and want to compare the relative performance of three things: Wi-Fi, Fibre to the Cabinet and FTTP.
Not much to say about the latter, that's the preferred option, but I'd like to know which of the other two will be better for the majority.
Two cabs both on the edges of the village. Fibre ducting is already in place to the village (previous separate project).
Speed depends on D-side lengths and qualities.
D-sides ranging from maybe 50m in the kms. The 50m line might expect to see the top speed, but I can have a go at working out what each house will get or taking some point averages.
However while I can work out the line lengths, I have no idea of the metal or the gauge. As an indicator our 3680m long line managed an IP profile of 1750 with attenuation in the high 50s/low 60s when we had it, and a noise margin of 15 or 18 I think, it's so long ago.
I have stats for quite a few of the lines (some are hilarious, they're 0.5Meg down). Any way of spotting lines which are obviously decrepit/aliminium? Is it the high attenuation for the length that indicates it, or the noise margin? (Line performance round here swings wildly even on similar length lines)
As, without knowing what lines are what, if I don't have stats to try and work it out, the only thing I can see to do is to calculate the speeds based on (0.5mm?) copper and then just downgrade them by an abitrary estimate. I just don't know what that estimate ought to be. I'd also be making the assumption that the D-side is aliminium too, rather than the E-side (which would be bypassed and is therefore not relevant) or a mix of the two. It can only be a best guess.
Church off centre of village, but at one of the highest points and near the fibre ducting. Greatest distance for signal to travel - perhaps 7km. No obstructions at all on one side, a hill on the other so might need a repeater, but might not.
To my questions...
FTTC: Can anyone point me at likely speeds versus distance for the newer profile? I know it's only an estimate, I've seen 600m lines do 20Meg down and others do 40. I need for both aliminium and copper. Am I right in thinking that most lines which are copper, will be 0.5mm copper as they're all very old? Plus, most charts I've seen top out at around 900m line length (convenient). I need a chart that goes up to say 5km.
WiFi: What's the speed versus distance computation? Any other factors? Size of antenna? Size of cell?
Finally, what sort of backhaul would be needed for perhaps 100 users (not simultaneous) aiming to deliver a true 25Mbps+ downstream, what is the "normal" contention ratio to work to?
That's the key question - I want to know if either of these technologies gets us anywhere near that, so if the FTTP option doesn't come to bear, we know which of the two alternatives will get the most speeds to the most people.
The other factor is that if we went for any option other that FTTC I'm sure BT will pop along to fibre the cabs the next day, so I want to know what speeds that will achieve by comparison.