In enterprise considerations, I forgot growth capacity. I note that I just say what orgs should consider, but don’t give guidelines (aside from packet vs. circuit) for how to resolve those considerations. A private circuit switched network is multiple PBXs connected by leased lines. PBXs are privately owned circuit switching nodes.

In terms of day-to-day operation, what we’re concerned about is reliability and peak traffic flow. Stallings says that packet switched networks are inherently more reliable (because we can route around issues), so choose them if that is your concern. For growth (traffic and reach), packet switched nodes are again easier to build out.