ServerNet/FX Adapter Configuration and Management Manual

Glossary
ServerNet/FX Adapter Configuration and Management Manual—426872-002
Glossary-3
Expand bypass
Expand bypass. The NonStop message system bypasses the Expand subsystem when
sending certain messages between neighbor systems on the same FOX ring. These
messages are handled directly by the ServerNet X and Y fabrics and the ServerNet/FX
adapters.
Expand neighbors. Two adjacent Expand systems that have a path between them.
fabric. A complex set of interconnections through which there can be multiple and (to the
user) unknown paths from point to point. The term “fabric” is used to refer to the X or Y
portion of the ServerNet system area network (ServerNet SAN); for example, the X
fabric.
Fiber Optic Extension (FOX II). A product that allows you to create high-speed (up to 4
megabytes per second) networks of as many as 14 systems connected by dual fiber-
optic cables. See also Expand-over-FOX line-handler process.
field-replaceable unit (FRU). A unit that can be replaced in the field. FRUs that are not
also customer-replaceable units (CRUs) can be replaced only by qualified personnel
trained by HP and cannot be replaced by customers. See also customer-replaceable
unit (CRU).
filler panel. A blank faceplate that is installed in place of a ServerNet adapter to ensure
proper ventilation within a system enclosure.
FIR. See FRU information record (FIR).
firmware. Code in memory that is necessary for the power-up initialization and
communication with a host or device. The software for components of the ServerNet
architecture (for example, an adapter) is called firmware. Some firmware for ServerNet
components is downloaded when the system or component is loaded.
FOX. Fiber Optic eXtension.
FOX II. See Fiber Optic Extension (FOX II).
FOX cable neighbors. Two FOX systems that are directly connected by a physical FOX
fiber optic cable. See also Fiber Optic Extension (FOX II).
FOX direct logical connection. A bidirectional, logical connection between any processor
in a cluster on a FOX ring and any other processor in any other cluster on the FOX
ring. Each bidirectional logical connection consists of four unidirectional FOX direct
logical paths (XL, XR, YL, and YR) in each direction. See also FOX direct logical path.
FOX direct logical path. A single, unidirectional, logical path from a processor in a cluster
on a FOX ring to any other processor in any other cluster on the FOX ring. Every
processor maintains four unidirectional logical paths to any other processor in any
other cluster on the FOX ring. The four unidirectional logical paths are called XL, XR,
YL, and YR. See also FOX direct logical connection.