The scenario
This service provider network diagram models the 4G LTE Evolved Packet Core (EPC), including radio access eNodeBs connected to the core via S1-MME and S1-U links and interconnected by X2.
What is in this drawing
Read the decisions behind it.
01
Mapped eNodeBs to ap kinds and user devices to mobile kinds inside a Radio Access Network zone.
02
Grouped core network functions (MME, SGW, PGW, HSS, PCRF) in an Evolved Packet Core zone with tier: core.
03
Added S1-MME, S1-U, and X2 link annotations to make interface roles explicit without cluttering device labels.
Use this topology when documenting or explaining LTE/EPC service provider architectures, especially where S1 and X2 interface visibility matters.
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