Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 384

IMF (Infant Mortality Factor)
The ratio of the first year failure rate to the steady-state failure rate.
Index of Refraction
Also refractive index. The ratio of the velocity of light in free space to the velocity of light in a
fiber material. Symbolized by n and is greater than or equal to one.
Index-Matching Gel
A gel with an index of refraction nearly equal to that of the fiber's core. This gel is used to
reduce Fresnel reflection at fiber ends.
Insertion Loss
The loss of power that results from inserting a component, such as a connector or splice, into a
previously continuous path.
Intrinsic Losses
Splice losses arising from differences in the fibers being spliced.
IR (Intermediate Reach)
Optical sections from a few kilometers (km) to approximately 15 km.
Irradiance
The amount of power per unit area.
ISO (International Standards Organization)
A United Nations agency concerned with international standardization in a broad range of
industrial and technical field.
ITU (International Telecommunication Union)
A United Nations telecommunications established to provide standardized communications
procedures and practices including frequency allocation and radio regulations on a worldwide
basis.
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J Jacket
The outer, protective covering of the cable.
Jitter
Small and rapid variations in the timing of a waveform due to noise, changes in component
characteristics, supply voltages, imperfect synchronizing circuits, and so forth.
Jumper
A short fiber optic cable with connectors on both ends.
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G L O S S A R Y
G L - 1 4
Lucent Technologies - Proprietary
See notice on first page
365-575-783R1.1
Issue 1, June 2002