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Glossary–6 edge switch 2/16 service manual
Glossary
bezel
A removable panel that covers empty drive bays and port cards.
bidirectional
In Fibre Channel protocol, the capability to simultaneously communicate at maximum speeds
in both directions over a link.
bit
Abbreviated as b. (1) Binary digit, the smallest unit of data in computing, with a value of zero
or one (D). (2) A bit is the basic data unit of all digital computers. It is usually part of a data
byte or data word; however, a single bit can be used to control or read logic ON/OFF
functions. (3) A bit is a single digit in a binary number. Bits are the 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 connection. See
connectivity attribute. See also dynamic connection; dynamic connectivity.
blocked port
In a director or switch, the attribute that when set, removes the communication 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.