DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Wireless Local Loop
   fixed-radio access
   FRA
   radio in the loop
   RITL
   WLL
      <communications> (WLL, radio in the loop, RITL, fixed-radio
      access, FRA) Connecting subscribers to the public switched
    telephone network (PSTN) using radio signals instead of
      copper wires.  The wireless link may be all or part of the
      connection between the subscriber and the switch.  WLL
      includes cordless access systems, proprietary fixed radio
      access and fixed cellular systems.
      (2008-03-15)