Covid 19 Update: Given the current global situation, we have paused the delivery of our LiveOnsite courses, but our LiveOnline and OnlineAnytime Packages remain unaffected. Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future LiveOnsite courses when we are able to safely resume in person training.

A3 Interface

The A3 interface carries coded user information (voice/data) and signaling information between the Selection / Distribution unit function and the channel element component of the BTS (Base Transceiver System). The A3 interface is composed of two parts, Signaling and User Traffic. The signaling information is carried across a separate logical channel from the user traffic channel, and controls the allocation and use of channels for transporting user traffic. The user traffic is transported in traffic channels.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

Explore NetX today with a
free trial.
More Info about NetX