The present document defines the communication interface between a TC-SES BSM Regenerative Satellite Mesh-A (RSM-A) air interface compliant Satellite Terminal (ST) and the Security Access Module (SAM). It specifies the communication medium and the protocols for communication. The present document describes how packets, received at the ST from the Network Operations Control Centre (NOCC), are routed to the SAM, how messages created originally by the ST are routed to the SAM, how message from the SAM are routed via the ST to the NOCC and how messages from the SAM are consumption by the ST.