From: wollman@bimajority.org   
      
   In article <20230125201741.GA1374974@telecomdigest.us>,   
   Bill Horne   wrote:   
      
   >In the U.S., it's common to find business Internet connections that   
   >depend on AC power to operate, which go dead during a power   
   >failure. Since most elevators here also run on AC, any widespread   
   >power failure leads to tens or hundreds of people stranded in   
   >elevators, and, if the emergency phones in those elevators require   
   >Internet connections to work, also unable to call for help.   
      
   In some jurisdictions, buildings where elevators are mandatory are   
   also required to have backup power sufficient to return those   
   elevators to the recall floor.  Of course that does not do much for   
   older buildings that were never retrofitted, and I'm not sure what   
   requirements are imposed on the emergency phones specifically.   
      
   This is brought to mind by the fact that our building was closed for   
   two days this past month in order to perform preventive maintenance on   
   the automatic transfer switch, which required shutting down utility   
   power and doing a manual transfer for generator loads.  Much of my   
   core network equipment is on generator power, as well as a UPS, but   
   the office switches and anything powered by them (desk phones and   
   wireless access points) are not.   
      
   -GAWollman   
      
   --   
   Garrett A. Wollman    | "Act to avoid constraining the future; if you can,   
   wollman@bimajority.org| act to remove constraint from the future.  This is   
   Opinions not shared by| a thing you can do, are able to do, to do together."   
   my employers.         | - Graydon Saunders, _A Succession of Bad Days_ (2015)   
      
   --- SoupGate-Win32 v1.05   
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