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On 09/10/10 19:25, Rob Beard wrote: > > I do wonder if post Armageddon things like telephone exchanges would > still work? Depends greatly on the nature of "Armageddon". They all have redundant power, so assuming Armageddon didn't cause physical damage to the exchange, and any electrical pulses were minimal, they'll presumably work till the batteries run down. Some government telecommunications were hardened to survive nuclear attack during the cold war. How much of this is anything to do with BT I'm not sure, the contracts weren't directly with BT when I last read about it in the Financial Times. With their comparative lack of wires, and lots of use of microwave links, might be interesting to compare robustness of mobile phone networks. I'm guessing bits might survive better against certain common types of catastrophic event, but I doubt they'd be usefully usable unless it was designed in given how fragile a lot of the technology is. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq