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The New Public Network
Video lessons on this topic
Communication Basics #02 The New Public Network
Communication Basics #16 PSTN Infrastructure: Hierarchy, Local Loop & SS7
Communication Basics #30 Worked Example: PSTN Topology — Tandem vs Mesh, the Real Reason for Hubs
Related lessons
Solution Notebook · EN
#02 Backbone and access digitalization, next-generation network targets, application requirements, backbone scaling, and SI prefixes
Solution Notebook · EN
#16 Historical PSTN access and class hierarchy, G.711 context, SS7/MTP/ISUP roles, trunk-group counting, traffic dimensioning, and NGN migration
Solution Notebook · EN
#30 derive E_star=n independent edges/trunks for a simplified single-tandem star and E_mesh=C(n,2)=n(n−1)/2 for full mesh; verify 5/10, 10/45, and 100/4950 at n=5, 10, and 100; avoid treating edge-count scaling as capacity-, cable-length-, equipment-, or cost-equivalence; add traffic-matrix, busy-hour offered traffic, Erlang/blocking grade-of-service, tandem-fabric, routing, redundancy, protection, and lifecycle gates