Half-duplex – HP Brocade 4Gb SAN Switch for HP BladeSystem p-Class User Manual
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252 Glossary
GLM
Gigabit Link Module. A semitransparent transceiver that incorporates serializing and deserializing functions.
GMT
Greenwich Mean Time. An international time zone. Also known as UTC. See also
GUI
A graphical user interface, such as HP Advanced Web Tools and HP Fabric Manager.
HA
High availability. A set of features in HP StorageWorks switches that provides maximum reliability and
nondisruptive replacement of key hardware and software modules.
half-duplex
A mode of communication that allows a port to either transmit or receive frames at any time except simultaneously
(with the exception of link control frames, which can be transmitted at any time). See also
.
hard address
The AL_PA that an NL_Port attempts to acquire during loop initialization.
HBA
Host bus adapter. The interface card between a server or workstation bus and the Fibre Channel network.
header
A Fibre Channel frame has a header and a payload. The header contains control and addressing information
associated with the frame. See also
.
HiPPI
High-Performance Parallel Interface. An 800 Mbps interface normally used in supercomputer environments.
hop count
The number of ISLs a frame must traverse to get from its source to its destination.
host
A computer system that provides end users with services like computation and storage access.
HTTP
Hypertext Transfer Protocol. The standard TCP/IP transfer protocol used on the World Wide Web.
hub
A Fibre Channel wiring concentrator that collapses a loop topology into a physical star topology. Nodes are
automatically added to the loop when active and removed when inactive.
idle
Continuous transmission of an ordered set over a Fibre Channel link (when no data is being transmitted) to keep the
link active and maintain bit, byte, and word synchronization.
in-band
Transmission of management protocol over the Fibre Channel.