A mechanism used to protect content from being copied in an unauthorized manner via analog and/or digital IPTV Receiving Device interfaces.

A radio- or video-communications watch in which an operator is required to maintain a continuous receiver watch and to keep a complete log.

Of a data medium such as a diskette, pertaining to the use of one or more schemes designed to thwart copying in violation of copyright law or security considerations.

Common Object Request Broker Architecture

A switchboard circuit in which a plug-terminated cord is used to establish connections manually between user lines or between trunks and user lines.
Note: A number of cord circuits are furnished as part of the switchboard position equipment. The cords may be referred to as front cord and rear cord or trunk cord and station cord. In modern cordless switchboards,… (Read More →)

The lamp associated with a cord circuit that indicates supervisory conditions for the respective part of the connection.

A telephone switchboard in which manually operated keys are used to make connections.

1. The central region about the longitudinal axis of an optical fiber, which region supports guiding of the optical signal.
Note 1: For the fiber to guide the optical signal, the refractive index of the core must be slightly higher than that of the cladding.
Note 2: In different types of fibers, the core and core-cladding boundary function slightly differently… (Read More →)

The part of the cross-sectional area of an optical fiber within which the refractive index is everywhere greater than that of the innermost homogeneous cladding, by a specified fraction of the difference between the maximum refractive index of the core and the refractive index of the innermost cladding.
Note 1: Artifacts of the manufacturing process, such as refractive index dip,… (Read More →)

In the cross section of a realizable optical fiber, ideally circular, but assumed to a first approximation to be elliptical, the average of the diameters of the smallest circle that can be circumscribed about the core-cladding boundary, and the largest circle that can be inscribed within the core-cladding boundary.