How far can FTTP go in terms of bypassing the smaller exchanges 10 miles, 50 miles etc ?
Around 20km using the standard deployment method.
They can increase this distance by using Subtended Head Ends, making it more like 20km from where they install the S.H.E (ideally next to an existing Huawei FTTC cabinet).
Wonder if Openreach ever did or do specify any distance limits with their FTTP infrastructure?
I ask because I stumbled on an old (ancient really, 2013!) Openreach PIA reference offer document online that had a GEA FTTP schematic diagram, where a 28dB optical loss budget was noted, from OLT to the ONT.
This max figure would have included various necessary PON splitter losses, presumably up to 32 way splitting per core (but 128 way is noted, I guess in line with the GPON standards) as well as splices and connectors along in the full link.
Not sure what splitter losses they allow for, but a quick search says something in the order of 17 dB for combo of two series PON splits, so some fag pack maths and you're down to around 11 dB budget for the fibre attenuation @ around 0.36 dB per km, which is around 30 km or so, with no margins....
All back of fag packet of course!