EMC Connectrix B Series Hardware Reference Manual page 96

Glossary
GMT Greenwich Mean Time. An international time zone. Also known as
"UTC."
GUI A graphic user interface, such as Web Tools and Fabric Manager.
H
Half Duplex A mode of communication that allows a port to either transmit or
receive frames at any time, but not 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.
HCPLD
High-capacity PLD. Refers to both CPLDs and FPGAs.
Header
A Fibre Channel frame has a header and a payload. The header
contains control and addressing information associated with the
frame.
High Availability An attribute of equipment that identifies it as being capable of
conducting customer operations well in excess of 99% of the time.
Typically, high availability is identified by the number of nines in that
percentage. Five nines means the equipment is rated as being capable
of conducting customer operations 99.999% of the time without
failure.
HiPPI High-Performance Parallel Interface. An 800 Mb/sec 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 that accesses storage devices over the fabric. May also be
referred to as a server. See also Workstation.
Hot Pluggable A FRU capability that indicates it may be extracted or installed while
customer data is otherwise flowing in the chassis.
hot swappable A hot-swappable component can be replaced under power.
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EMC Connectrix B Series DS-8B3 and DS-16B3 Hardware Reference Manual