| 释义 |
KTS (Key Telephone System) electromechanical KTS systems (1A, 1A1, and 1A2) were limited in feature content to hold, intercom, speakerphones, and auto dialers. Electronic KTS (EKTS) systems appeared in the 1970s, offering many of the same features as PBX systems. Most contemporary key systems are hybrids, meaning that they can operate either as a KTS or a PBX. Hybrids generally are limited to 200–250 or so ports, each of which often can serve to connect end user terminal equipment or an outside line to the KSU. See also 1A, 1A1, 1A2, CPE, line, PBX, and trunk. |