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Half-duplex – HP Brocade 4Gb SAN Switch for HP BladeSystem p-Class User Manual

Page 252

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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

UTC

.

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

full-duplex

.

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

payload

.

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.