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You haven't had "analog" phone calls for decades. Your analog line was converted to a digital signal at the central office or concentrator (ugly green boxes).
by giantrobot 6y ago
You haven't had "analog" phone calls for decades. Your analog line was converted to a digital signal at the central office or concentrator (ugly green boxes).
From the CO to a tandem through the core network your call was digitally switched to the endpoint where it was converted back to analog for the callee's phone.
- wrs 6y agoHowever, those were circuit-switched, not packet-switched. (At least for a while.)
- giantrobot 6y agoI should have been clearer, the OP doesn't want "analog" service but PSTN (TWM switched) service. Unfortunately that is dying out as carriers are moving to all IP core networks. As customers have moved away from fixed landline service it ends up costing more per customer to keep the PSTN running. The last mile equipment is the same for TWM or IP switching but they can dump that directly into an IP network rather than maintain a hierarchy of COs/tandems/toll switches with dedicated links between them.