Comment by MichaelAza
2 years ago
Under Telephone History it says:
> The current PABX-based system went live over the weekend of 27-29th July 1990
A PBX serving a whole country, even a small one, is wild. From what I could find [1] the system used was a UXD5 exchange [2] which is technically a PSTN exchange intended for rural areas and based off the Monarch 120 PBX [3].
The architecture of the UXD5 is common to a lot of telephone exchanges of the time (possibly modern ones as well?) with actor based message passing, actors running on different levels (more real time vs less real time) and a combination of assembly and a high level language (in this case, Coral [4]). Fascinating stuff.
[1] https://techmonitor.ai/technology/cable_wireless_has_contrac...
[2] https://sites.google.com/site/monarchcallconnectsystem/uxd5-...
[3] https://sites.google.com/site/monarchcallconnectsystem/monar...
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