4. Elevator Shaft Communication

By default, 2N Lift8 (L8) works as a communication system, which provides communication between the audio units installed in the elevator shaft and the control room. The system is controlled by a Central Unit (CU), which ensures the interconnection of the connected audio units and the central control room. The audio units from the elevator cabins, shafts and machine room connect to the CU via splitters. Each splitter is designed for use in one elevator shaft. The CU contains an internal splitter of its own. Up to 7 additional splitters can be connected to the CU. Hence, the 2N Lift8 system is capable of ensuring communication for up to 8 elevator shafts (CU + 7 splitters).

5 or 8 audio units can be connected to the CU internal splitter depending on the Lift8 CU batch, which is determined by the CU serial number. The serial number consists of three hyphen-separated parts, the second part (four digits) defining the batch.

CU Part No. Batch for 8 audio unit connection option
918600EXXXX and higher




Up to 7 audio unit locations are available within each elevator:

  1. Cabin roof 1
  2. Inside cabin 1
  3. Under cabin 1
  4. Shaft bottom
  5. Cabin roof 2
  6. Inside cabin 2
  7. Under cabin 2

A Fireman audio unit or an MEEF evacuation audio unit can be connected to the system, being located outside the shaft and activating the priority call with the elevator cabin.

Basic Features

  • Up to 8-elevator connectivity
  • Variable communication interfaces (PSTN, GSM, UMTS, VoIP, LTE)
  • Audio units for the cabin, shaft, machine room, emergency services
  • Optimum acoustic properties
  • Rechargeable built-in backup battery
  • Easy control and configuration – voice response system
  • Checking Call function
  • Elevator blocking during connection failure
  • Internal communication – Triphony
  • Remote maintenance
  • Periodical automatic function check
  • Telephone/PC-based configuration (via USB or Internet)
  • USB interface
  • User message recording option
  • Local control center (Intercom)
  • Fireman function

System Diagram

Example of 2N Lift8 Central Unit, Splitter and Audio Unit Connection

Main bus

Audio unit bus