FOA CFOS/DC key terms

All fiber cable, enclosures, and supporting hardware installed outdoors between buildings, cabinets, or pedestals, exposed to weather, traffic, and environmental hazards rather than protected inside a building.

Cabling and hardware located within a building, such as entrance facilities, equipment rooms, backbone risers, and horizontal distribution, governed by indoor fire and bend-radius rules.

The point where outside plant cable enters a building and transitions to interior cable, including entrance room hardware, protectors, and the demarcation between carrier and customer responsibility.

The boundary where the service provider's network ends and the customer's cabling begins, defining who maintains and troubleshoots which portion of the link.

The high-count portion of a network connecting entrance facilities, equipment rooms, and cross-connects across a campus or building, carrying aggregated traffic between distribution points.

The portion of cabling that runs from a telecommunications room to individual work areas or outlets, typically shorter runs with lower fiber counts than backbone links.

A standardized hierarchical layout of cabling subsystems and connection points that supports multiple services and vendors, simplifying moves, adds, and changes over the life of a building.

Fiber installed on utility poles and strand between supports, using lashing orADSS cable, common in areas where trenching is costly or impractical.

Fiber placed in trenches, conduits, or direct-buried in soil, offering physical protection and long service life at the cost of excavation and permitting effort.

All-dielectric self-supporting cable that carries its own weight between poles without a metallic messenger strand, useful near power lines where metallic strength members are undesirable.

A method of attaching aerial cable to a messenger strand with a lash wire wrapped alternately around both cable and strand, forming a figure-eight pattern that supports the cable's weight.

A group of buried conduits, often encased in concrete, that routes and protects cables underground while allowing later pulling, replacement, or addition of fibers.

A smaller flexible tube installed inside a larger conduit to subdivide the space, allowing multiple cables to be pulled separately and reducing friction and congestion.

A small covered underground enclosure large enough for a technician to reach in and work on splices or pulling, but not to enter, used between manholes or along buried routes.

A sealed housing that protects fusion or mechanical splices and exposed fiber from moisture, dirt, and mechanical damage, used in aerial, buried, and underground installations.

Joining two fibers by melting their ends together with an electric arc, producing a low-loss, low-reflection permanent connection that is protected inside a splice closure or tray.

A field-installable connector that aligns and holds two fiber ends together with index-matching gel or adhesive, faster than fusion splicing but typically higher loss and reflection.

A rack-mounted enclosure that terminates incoming cables, holds splice trays and adapters, and provides organized patching between backbone and equipment ports.

A passive panel of adapters where incoming cable strands terminate and cross-connects are made with patch cords, enabling flexible rearrangement without disturbing permanent cabling.

A short, flexible factory-terminated cable with connectors on both ends used to link ports, panels, and equipment, available in single-mode and multimode types.

The minimum curve a cable or fiber may be bent without damage or added loss; violating it causes microbending, cracks, or attenuation that may not appear until later.

Tiny, localized bends along a fiber caused by tight buffering, rough surfaces, or clamping, which leak light from the core and raise attenuation, especially at longer wavelengths.

The loss of optical power as light travels through fiber, connectors, and splices, measured in decibels and limiting how far a link can reach without regeneration.

The signal power lost when a component such as a connector, splice, or splitter is inserted into a link, expressed in decibels and subtracted in the link budget.

The arithmetic comparison of transmitter output, fiber and component losses, margins, and receiver sensitivity that proves a planned link will work over its intended distance.

An allowance reserved in the link budget for imperfect field splices and aging, ensuring the design still passes even when actual splice loss exceeds the typical value.

The number of individual strands inside a cable, chosen from current demand plus spare capacity for growth, restoration, and future services.

A documented record assigning each fiber in each cable to a specific termination, splice, or port, essential for troubleshooting and for consistent records across the network.

The final drawings, splice schematics, and route records updated to reflect what was actually installed, differing from design drawings and used for future maintenance and expansion.

A written statement defining what a project will deliver, what it excludes, and the acceptance criteria, forming the basis for estimates, schedules, and change control.

A hierarchical decomposition of project deliverables into manageable tasks, used to assign responsibilities, estimate durations, and track progress against the plan.

A scheduling technique that identifies the longest sequence of dependent tasks, showing which activities cannot slip without delaying the project completion date.

The amount of time a task can be delayed without affecting the project finish or a successor, with zero float marking activities on the critical path.

A bar chart displaying tasks against a calendar timeline, showing start and finish dates, durations, overlaps, and dependencies for communicating the schedule to stakeholders.

A zero-duration marker in the schedule denoting a significant accomplishment or decision point, such as design approval or substantial completion, used to track major progress.

A formal written amendment authorizing a modification to scope, schedule, or price after the baseline is set, protecting both parties from undocumented work.

A compiled record of incomplete or defective items found during inspection that must be corrected before final acceptance and closeout of the project.

The final phase of a project covering testing records, as-built documentation, training, warranty handoff, punch-list completion, and formal customer acceptance.

The longitudinal force applied to cable during installation, which must stay below the manufacturer's limit to avoid stretching fiber, increasing loss, or breaking strands.