loud speaker, aiphone intercom, intercom station, aiphone The LDF Loudspeaker Intercom and External Control System is designed for communication between a central master station and remote intercom stations. The LDF is an expanded feature version of the LAF-C/CA system. All information regarding installation other than the external control functions is included in the LAF-C/CA instructions. The LDF-C and LDF-CA console intercom system provides the same features as the LAF-C/CA, but with the added ability to selectively control remote devices (such as door strikes, maglocks, lights, alarm contacts, etc.). Masters are available in 20 and 40 station sizes, with or without a handset. Add-on selectors with 20 or 40 station capacity can be connected to expand the system. Single or multi-master capability, fully intermixable with all LEF series components. In addition to communication to remote locations, external devices can be activated, such as activating a CCTV camera when the associated sub station is selected, selectively controlling the corresponding door strike or maglock, or both.


  • Expandable to 120 stations
  • Same features as LAF-C system, but with added selective control features
  • Selective door release, corresponding to the door where communication is established (RY-PA relay for each contact)
  • Selective control can provide momentary or maintained contact via separate relay (RY-PA) when integrated with any other system activated by a relay contact
  • Uses standard LE- or LS-series sub stations

Power SourceDC 12V. Use PS-1225UL power supply.
Current Consumption350mA Maximum.
Power Output500mW (transmit); 800mW (receive).
CallingMono-electronic tone while call button is pressed, plus LED for 20 seconds.
CommunicationPress-to-talk at calling master, or VOX (voice actuated) with handset.
Hands free at remote or responding master.
Talk ChannelSingle talk channel.
Wiring1 Master system: 2 conductors homerun from each remote. (Use Aiphone #822202.)
Multi-master system: 2 common + 1 individual wire per sub station. (Use Aiphone #822203.)
Between masters: 4 common + 1 wire per station in the system. Add 1 wire for each contact that is used within the system and 4 common wires if All Call is included.
(Use Aiphone #8222xx series wire (xx = # of conductors)).
Wiring Distance650 with 22AWG; 1600 with 18AWG.
MountingDesk or wall mount.
LDF-20C: 5-1/2" x 13-5/8" x 10-1/4"
LDF-20CA: 5-1/2" x 17-9/16" x 10-1/4"
LDF-40C: 5-1/2" x 19-1/2" x 10-1/4"
LDF-40CA: 5-1/2" x 23-7/16" x 10-1/4"
LD-20AS: 5-1/2" x 6-15/16" x 10-1/4"
LD-40AS: 5-1/2" x 12-7/8" x 10-1/4"

System Layout:

loud speaker, aiphone intercom, intercom station, aiphone