Recommendation ITU-T Q.3230 provides the protocol for the interface between the transport location management physical entity (TLM-PE) of the network attachment control entity (NACE) and the network information distribution physical entity (NID-PE) of the mobility management control entity (MMCE). The M13 interface provides the keying material, derived from the user equipment (UE) authentication procedure, in support of the security association required between the NID-PE and the UE. This Recommendation supports information flows providing the keying material via the M13 reference point as specified in Recommendation ITU‑T Y.2018.