zlacker

>>gjvc+(OP)
There is also a step-by-step in Florida still in the public phone network.

https://www.telcodata.us/view-switch-detail-by-clli?clli=LGW...

https://www.telcodata.us/search-area-code-exchange-detail?np...

>>aftbit+UB1
I'd wonder if that is stale data? There is a small building that looks an awful lot like a central office at that location [0], but I'd find it a bit farfetched that a 355A would still be active in the PSTN at this late date, given that Nantes, QC was supposed to be the last step in Zone 1. Also, while things may be different in the Wyoming desert, landlines are rapidly disappearing in general. If it's still in use, I'd guess it's either a DMS-10 (those are fast disappearing too), or a modern packet switch or cellular node.

I wonder how much old equipment is still abandoned in place? A fair number of museum finds have come more-or-less intact from old COs, and newer equipment often occupied but a corner of older buildings.

[0] https://www.google.com/maps/@42.812278,-107.6168592,463m/dat...

>>flying+PR2
Although telcos are supposed to update the central equipment database (LERG) tables, not all of them do, or do it reliably. So if the LERG says such and such office has a Strowger or a DMS 10, it need not be true.

Ironically, now that Microsoft have killed off Metaswitch, and the Chinese vendors are banned, Ribbon (who own the Nortel assets) are probably the only game left in town. But I'm not sure there is much appetite or money among telcos to do a mass migration, meaning more and more gear will be left to rust in place.

>>kjells+ow3
Very little money in it - POTS has been a dead end for a long time. The only thing keeping it alive is regulatory demands, and those have been steadily losing enforcement because only rare edge cases still care.