The actual status of the debug interface. A link will
be InService if the sonusNrsDebugIfAdminStatus is enabled and
the physical link is up. It will be OutOfService if the admin
status is enabled but the physical link is down. It will be
OutOfServiceDisabled if the physical link is up but the admin
status is disabled. It will be OutOfServiceLinkDown if the
physical link is down and the admin status is disabled.