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bridge port
British thermal unit
broadband
broadcast
broadcast frame
Btu
buffer
buffer-to-buffer credit
bypassed port
between two network segments that use the same communications
protocol.
B_Port. (1) In Fibre Channel protocol, a fabric inter-element port used
to connect bridge devices with E_Ports on a switch. B_Ports provide a
subset of E_Port functionality. (2) A IBM term for a physical interface
between the fabric (switch) and a bridge device. The interface is iden-
tical to an expansion port (E_Port), but it does not participate in full
expansion port protocols. As such, it does not assign domain IDs or
participate in routing protocol. See also
generic
port;
node
port;
Btu. The quantity of heat required to raise the temperature of one
pound of water by one degree Fahrenheit (D).
Large bandwidth communications channel capable of multiple, par-
allel high-speed transmissions.
In Fibre Channel protocol, to send a transmission to all node ports
(N_Ports) on a fabric. See also
In Fibre Channel protocol, a frame whose destination address speci-
fies all node ports (N_Ports) in the fabric. See also broadcast.
See
British thermal
unit.
Storage area for data in transit. Buffers compensate for differences in
processing speeds between devices. See
BB_Credit. (1) The maximum number of receive buffers allocated to a
transmitting node port (N_Port) or fabric port (F_Port). Credit repre-
sents the maximum number of outstanding frames that can be trans-
mitted by that N_Port or F_Port without causing a buffer overrun
condition at the receiver. (2) The maximum number of frames a port
can transmit without receiving a receive ready signal from the receiv-
ing device. BB_Credit can be adjustable to provide different levels of
compensation.
If a port is bypassed, all serial channel signals route past the port. A
device attached to the port cannot communicate with other devices in
the loop.
expansion
segmented expansion
port.
broadcast
frame.
buffer-to-buffer
port;
fabric
port;
credit.
Glossary
519
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