Planning A Blow Route
Fibreflow is perfect for ‘Last Mile’ networks, typically between a cabinet and several customers, eg Fibre-to-the-Home.
It may be a ‘circular’ route, with branches (single or double) off to each customer.
Or it may be a totally branched network, with no loops or diversity.
Planning the blowing
1. Decide on the fibre count per blown fibre product, and decide the microduct size to suit.
2. Break the routes up into convenient blow distances.
3. Define blowing point positions wherever needed.
This network contains 6 factories (to be double linked) and 30 houses (single link)
They will each receive links of 4-fibre, via 5mm microduct.
Assume the maximum blow distance then is 1000m.
First, put manholes to break up the route into three sections, A, B, and C.
This will be the double diversity loop
Then add 2 branch routes along the streets to the houses.
Now examine the links to two of the factories:
Factory D: Blow E to D = First link (200m). Blow F/E, F/G, G/D (one fibre 2000m) = 2nd link.
Factory H: Blow E to H = First link (700m). Blow F/E, F/G, G/H (one fibre 1500m) = 2nd link.
Note there are NO SPLICES anywhere. Each fibre ‘E-F-G-factory’ is an unbroken single length.
Houses: All are blown from box G, via various tube bundles.
Then blown back to the PoP/Exchange at E (with centre blows).
There are no splices at G.
Each house is thus linked directly to the 'PoP' at E, with minimal optical losses.