The Free On-line Dictionary of Computing (30 December 2018):
A kind of connection to a FDDI network where a
host is simultaneously connected to two separate devices in
the same FDDI ring. One of the connections becomes active
while the other one is automatically blocked. If the first
connection fails, the backup link takes over with no
A dual-homed device can tolerate a fault in one of its "homes"
whereas a dual-attached device can tolerate a fault in one
of the rings.