August 2016 Glossary 291
FLOGI
Fabric Login.
Flow Control
The process of limiting the number of single frames or groups of frames received by
the receiving port. This is accomplished using a credit system. See Buffer-to-Buffer
Credit (BB_Credit) and End-to-End Credit (EE_Credit).
Frame
An indivisible, encapsulated data structure containing a beginning-of-frame (BOF)
and end-of-frame (EOF) designator, which carries a payload of both control data and
user data from one FC port to another.
Frame Header
The first field in a frame that contains addressing information, as well as other
control information, about the frame.
FRU
Field replaceable unit.
FSC
See Fault Symptom Code.
Full Duplex
A communication protocol that allows signals to be transmitted and received
simultaneously, and usually contains flow control.
G
GAID
Get alias_ID.
GBIC
Giga-bit interface converter.
GRDC
Guard Check
H
Half Duplex
A communications protocol that permits a port to transmit or receive frames at any
point in time, but not simultaneously, as in full duplex. The one exception to this is
with link control frames, which are always allowed in full duplex.
HBA
See host bus adapter (HBA).
Header Data
The part of a message that contains system-defined control information. This data
may contain, but not be restricted to, one or more destination fields, initiator and
receiver address, and priority level of the message.
Hexadecimal
A number system with a base of 16 instead of 10.
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