About Fiber Optic Cable Installations
Fiber is not my area of expertise.
I made these notes to inform myself about being a fiber customer.
- “Fiber optic duct” gets buried in trenches 2–4′ deep.
- The duct is often 4″ plastic duct/pipe, often with one or several pre-install innerducts (duct liners) and pull tapes.
- Multiple innerducts allow multiple cable to be pulled at different times. (Pulling a second cable through an already-occupied innerduct could lead to tangling or tearing; don’t do it.)
- Generally, the duct is buried by trenching, but directional boring may be used to go under roads and sidewalks.
- Where splicing or terminating cable, leave 30–60′ of extra loop.
- Neatly lash cables in manholes or vaults with cable ties. Don’t over-tighten the ties.
- Cable in vaults or other intermediate points should be tagged with an ID.
- Inside premises, protect cable with conduit or cable trays.
- Many building, fire, or electrical codes limit the length of bare OSP cable run indoors, so longer runs should be in conduit.
- Most OSP cables require installation of a “breakout kit” to sleeve each fiber in a tube rugged enough for direct termination.
- The fiber will terminate in some type of premises support structure. There a several types, including wall-mounted and rack-mount termination panels/patch panels.
- Leave room to store the service loop near the termination point.
- Ground and bond all conductive cabling and metallic hardware including patch/termination panels.
- OSP cable (“outside plant”) may be underground, direct buried, aerial or submarine.
- A messenger is a stronger cable to which fiber is lashed in aerial installations.