Splices create a permanent joint between two fibers, so its use is limited to places where cables are not expected to be available for servicing in the future. The most common application for splicing is concatenating (joining) cables in long outside plant cable runs where the length of the run requires more than one cable. Splicing can be used to mix a number of different types of cables such as connecting a 48 fiber cable to six 8 fiber cables going to various locations. Splicing is generally used to terminate singlemode fibers by splicing preterminated pigtails onto each fiber. And of course, splicing is used for OSP restoration.
What are the measurement units for power? Optical power is measured in linear units of milliwatts (mW), microwatts (uW – really the greek letter “mu”W), nanowatts (nW) and decibels (dB). What is the difference between “dBm” and “dB”? dB is a ratio of two powers, for example the loss in a fiber optic cable. When power is measured in linear units (mW, uW or nW), dB is calculated on a log scale using this formula: power (dB) = 10 log (power1/power2) If we are measuring absolute power levels, the measurement is generally referenced to 1 milliwatt (mW).
Central office, or head-end, is a hub or centrally located point in a service provider network at which a conglomerate signal is distributed to optical nodes in neighborhoods or premise locations, carrying voice, data, and/or video service services to end users. For most service providers, fiber optics represent a large segment of the network infrastructure in and out of the central office. This technology allows for a large amount of bandwidth to be fed into the central office and processed, redirected, and/or distributed to the downstream network.
Aerial & Underground
This procedure provides general information for the installation of aerial fiber optic cables. The methods described are intended for guideline use only, as it is impossible to cover all the various conditions that may arise during an installation. Individual company practices for placing aerial fiber optic cable should supersede any conflicting instructions in this document when they do not exceed the cable’s optical and mechanical performance specifications.