Around the turn of the century, in a network the size of Europe, we had OOB comms to the core routers via ISDN/POTS. We experimented with mobile phones in the

Around the turn of the century, in a network the size of Europe, we had OOB comms to the core routers via ISDN/POTS. We experimented with mobile phones in the racks as well, much to the chagrin of the old telco guys running the PoPs.