# Interface

An interface is a logical or physical connection between two network elements that allows them to communicate. Interfaces allow the AMF, MME, ENB, GNB & HSS to communicate with each other. 

<figure><img src="/files/emRlpDAPpLCzqrcefj0I" alt=""><figcaption></figcaption></figure>

* **Radio Trunk** -The S1 connection between the radio and the private network's edge.
* **Edge Trunk** -The S6a connection between the edge and to HSS host.


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