In an optical fiber, an undesired decrease in the refractive index at the center of the core.
Note: An index dip is an artifact of certain manufacturing processes. Synonym profile dip.

1. In facsimile, the product of the total line length and the number of lines per unit length, divided by .
2. For rotating devices, the product of the drum diameter and the number of lines per unit length. Synonyms: diametral index of cooperation, international index of cooperation.

Synonym refractive index.

Synonym refractive index profile.

Synonym gel.

A substance, usually a liquid, cement (adhesive), or gel, which has an index of refraction that closely approximates that of an optical fiber, and is used to reduce Fresnel reflection at the fiber endface. (FAA)
Note 1: An index-matching material may be used in conjunction with pairs of mated connectors, with mechanical splices, or at the ends of fibers.
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See interaction crosstalk.

In digital data transmission, the use of a clock rate of 2n times the modulation rate, where n is an integer greater than one.

A wave, such as a radio wave or sound wave, that arrives at a given point by reflection or scattering from surrounding objects, rather than directly from the source. [From Weik '89]

A line that connects a single user to a switching center.