IBM SAN32M1, Installation And Service Manual

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SAN32M1 Fabric Switch Installation and Service Manual 532
basic unit of information capacity on a computer storage device.
Eight bits equals one byte.
bit density Expressed as bits per inch (bpi), the number of bits that can be written
on one inch of track on a disk surface.
bit error rate Abbreviated as ber. Ratio of received bits that contain errors to total
of all bits transmitted.
bits per inch
Abbreviated as bpi. Indicates the density of information on a hard
drive.
blocked connection In S/390 mode, in a director or switch, the attribute that, when set,
removes the communication capability of a specific port. A blocked
address is disabled so that no other address can be connected to it. A
blocked attribute supersedes a dedicated or prohibited attribute on
the same address. Contrast with
allowed connection ; unblocked con-
nection . See connectivity attribute . See also dynamic connection ;
dynamic connectivity .
blocked port In a director or switch, the attribute that when set, removes the com-
munication capability of a specific port. A blocked port continuously
transmits the offline sequence.
boot
(1) To start or restart a computer. (2) Loading the operating system.
bpi See bits per inch .
B_Port
See bridge port .
bps
Bits per second.
Bps
Bytes per second.
bridge
(1) An attaching device that connects two local area network (LAN)
segments to allow the transfer of information from one LAN segment
to the other. A bridge can connect the LAN segments directly by net-
work adapters and software in a single device, or can connect net-
work adapters in two devices through software and use of a
telecommunication link between the two adapters. (2) A functional
unit that connects two LANs that use the same logical link control
protocol, but may use different media access control protocols (T).
Contrast with
router . (3) A device that connects and passes packets