Fiber Strand Count from Homes Passed and Split Architecture
Sizes feeder and distribution fiber from premises passed, split ratio, terminal ports, design spare.
Example
You enter
- Living units or businesses passed 2000
- PON split ratio (N for 1:N) 32
- Drop terminal ports 8
- Design spare (%) 25
- Available standard fiber counts (comma separated) 12,24,48,72,96,144,216,288,432
- Route length (ft) 52800
- Lower-count cable cost ($/ft) 1.5
- Selected-count cable cost ($/ft) 1.8
- Placement cost ($/ft) 8
You get
- Feeder fibers required 63 raw; 79 with spare
- Feeder with spare 79
- Selected standard cable 96 fibers
- Distribution with spare 313
- Increment for selected count $15,840 (3.2 %)
No published worked example is on file for this calculation. It is checked against a hand-worked derivation of its method and an independent reference test.
Details, formula, and sources
ScopeSizes feeder and distribution fiber from premises passed, split ratio, terminal ports, design spare, and the available standard cable counts. It also prices the next standard count against placement cost: in the worked mile-route case, moving from 72 to 96 fibers costs 3.2% more installed. Take rate defers electronics, not permanent cable; the route survey and operator standard govern.
Formula or tablefeeder fibers = ceil(premises/split ratio); distribution fibers = ceil(premises/terminal ports); apply entered spare and round up to the first entered standard cable count.
Source and editionOutside-plant fiber-count takeoff with user-supplied standard cable counts and costs.
Free accessCeilings, a spare factor, and installed-cost comparison.
What governsEstimate. AHJ and licensed professional govern.
API field namesliving_units, split_ratio, terminal_ports, spare_pct, standard_counts, route_length_ft, lower_material_cost_per_ft, selected_material_cost_per_ft, placement_cost_per_ft, feeder_fibers_required, feeder_with_spare, selected_standard_count, distribution_with_spare, installed_cost_delta
- Standard counts are entered positive comma-separated values, rounded upwardavailable cable products
- Aggregate planning only splitter and terminal geography are not designedthe route survey
- Costs are entered placement method, permitting and restoration are site-specificthe project estimate