The signaling network that initiates a non-circuit-related message containing intermediate signaling network indication (ISNI) information; this network may send subsequent messages based on the received ISNI information. [T1.118-1992]

See access originator, disengagement originator.

Synonym speed of service.

Operational Readiness Testing

A method of combining two or more digital signals that have mutually independent pulses, thus avoiding intersymbol interference.

In digital video, a sampling where the luminance and the color-difference samples are generated from pixels arranged in common, continuous vertical and horizontal lines on a rectilinear grid that remains constant field/frame to field/frame. [After SMPTE]

A device forming part of an antenna feed and serving to combine or separate orthogonally polarized signals.

Operating System

1. open service architecture,
2. open service access,
3. operator service agreements,
4. open system adapter.

An electronic circuit designed to produce an ideally stable alternating voltage or current.