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I’ve read about all sorts of alarms (I don’t think smoke, but fire and other emergency alarms) running on things like ISDN before the term IoT ever existed
by the_only_law 6y ago
I’ve read about all sorts of alarms (I don’t think smoke, but fire and other emergency alarms) running on things like ISDN before the term IoT ever existed
- yetihehe 6y agoAnd I've worked on telemetry devices which had modem and could phone alarms and data to control room over landlines before there was any ISDN available. This was for city heating control. My company was upgrading this to mobile connectivity. Whole system earned it's worth after one pipe break, because operator could select area on map, turn off all flow to different devices with several clicks and they didn't have to use complicated freezing devices to fix pipe.