B

Back Reflection (Fiber Optic):

A measure of the percentage of power reflected back by a discontinuity in a fiber optic line. It is expressed in dB.

Bandwidth:

The frequency range over which the connector or device can operate without degradation of performance. Also the information carrying capacity of digital systems.

Base Metal:

The metal from which the connector, contact or other metal accessory is made and on which one or more metals or coatings may be deposited.

Bend Radius:

The maximum amount fiber or cable that can be bent without causing damage. Also called minimum safe bending radius.

Braid:

The covering formed from textile yarn. Braids provide mechanical and thermal protection to plastic insulation, separate cable segments in multi-conductor cables and act as components in flame retardant cables. See also Shield.

Breakdown Voltage:

The voltage at which the insulation between two conductors will break down.

Bundle (Fiber Optic):

A number of fibers grouped together (rigid or flexible), usually carrying a common signal (or an image, or a conduit for transfer of light power).