On Tuesday, July 8, 2014 3:10:51 PM UTC-4, Stephen Sprunk wrote:   
      
   > Frequency multiplexing was analog "pair gain".  Systems were available   
   > that supported up to eight POTS lines over a single pair of wires.  At   
   > the other end, a matching device was used to turn them back into analog   
   > POTS lines, which were connected to the switch as any other.   
      
   It would seem that with this arranagement, all eight users could use the pair   
   simultaneously, since they were assigned different frequencies.   
      
   Would you know the specific code of this device and when it entered service?    
   It sounds like a great way to save on cabling since there is no blocking.  As   
   menitoned, the older concentrator simply switched users around a smaller   
   number of trunks with the    
   potential of blocking.   
      
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