User Manual 
 
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  USB external ringing interface module (USB Interface module 2 relays 
3GV28184AA) 
The USB external ringing interface module allows driving an external system (like a ring or a lamp), 
following the ring tone cadence or the communication state of the phone connected on the telephone line. 
No system configuration is requested to install the module. 
USB Interface module 2 relays lets to connect directly one or 2 external ringings on the USB connector of 
your desk phone: 
The phone is in audio communication. 
The relay is active as long as the 
phone is in communication. 
The phone is ringing. The relay 
follows exactly the ring signal. 
List of supplies 
•  USB external ringing interface module. 
•  1 USB cable 1,5 m (4,9 feet) USB type A - USB type B. 
  Installation 
WARNING: The module must be closed before use. No settings require the module to be open. 
Ringing or during 
communication: 
N: Common. 
NC: Active signal. 
NO: Non-active signal. 
The lamp lights up when the phone is in communication. 
 
The breaking capacity is 12V/24V DC 15A or 120V/220V AC at 10A. 
  Connect the device 
•  Plug the provided cord USB type B on the USB connector of the module. 
•  Plug the provided cord USB type A on the USB connector of the desk phone. See description of the 
connectors of your phone.