Triphony – Internal communication between audio units, typically all audio units of one and the same lift, during repairs or rescue work
Dispatching office – Receives emergency calls, checking calls and, if necessary, lift failure reports. Separate dispatching offices can be responsible for different types of calls and mobile telephones can be used too.
LM, LiftManager – Supervisory software designed for small and medium-size lift supervising companies. Automatic receiving of checking calls. Comfortable programming of CU parameters.
DISA – Automatic voice menu, which helps route incoming calls to the required audio unit or activate additional functions, e.g. remote programming
ESS – Electronic Security System
PBX – Private branch exchange (equipped with PSTN interface and local analogue lines)
PSTN – Public switched telephone network. For simplification, it is assumed that the CU is connected to the PSTN although it works on the PBX line too in the same way