Loopback status of each cable from the port to the star coupler.
   The field applies only to CI. Possible displays are:

         A-B   Loopback tests pass on paths A and B.
         A-#   Loopback tests pass on path A.
         #-B   Loopback tests pass on path B.
         #-#   Loopback tests failed on paths A and B.
         N/A   Loopback tests are not being done.