Indicates whether port should perform Remote Loopback.
When on (3), outbound traffic is returned to the
ingress port. In other words, traffic comes from one
of the module's other ports to get to this one, and
upon arriving here gets sent back to that other port,
from where it continues on back to the originator of
the traffic.
The related object nbsCmmcPortLoopback may be forced
off(2) whenever this object is set to on(3).