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