HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual page 118

Translate phantom domains—Assigned to each remote fabric connected to a 400 MP Router or
MP Router Blade. Each fabric has one unique translate domain, regardless of how many EX_Ports
are connected to the fabric.
Backbone fabric—The 400 MP Router or MP Router Blade backbone fabric consists of at least
one 400 MP Router or MP Router Blade and includes all MP Routers and B-series switches connected
via E_Port to the 400 MP Router or MP Router Blades. When you install an MP Router Blade in a
4/256 SAN Director, all devices connected to the SAN Director Fibre Channel ports are part of
the backbone fabric.
Edge fabric—A fabric that is attached to an EX_Port on a 400 MP Router or MP Router Blade.
118 B-series switches and fabric rules