RealNetworks Data Transport. The proprietary data package Helix Server uses (along with RTSP) when communicating with RealPlayer. Contrast to RTP.

The proprietary data package protocol RealServer uses (along with RTSP) when communicating with RealPlayer. Contrast to RTP.

See Recall Dial Tone.

Recall dial tone. Stutter, or interrupted, dial tone indicating to a station user that the switchhook flash has been properly used to gain access to system features.

Rotary Displacement Transducer

resource definition table. In VTAM, a table that describes the characteristics of each node available to VTAM and associates each node with a network address. This is the main VTAM network configuration table.

Remote Digital Terminal. An intelligent network element that provides the interface between customer lines and DS1 facilities. The RDT is generally a concentration device that is deployed closer to the actual subscriber plant interfaces.

Radio Data Terminals

Reliability Demonstration Test

Resistance Temperature Detector

See Relational Design Tool.