Glossary
AL_PA Arbitrated Loop Physical Address. A 1-byte value used in the arbitrated loop
topology used to identify L_ports. This value will then also become the last byte
of the address identifier for each public L_port on the loop. The AL_PA can be
set through an ACI Set Drive Configuration command.
ANSI American National Standards Institute, which sets standards for, amongst other
things, Fibre Channel, SCSI and the safety of electrical devices.
arbitrated loop One of the three Fibre Channel topologies. Up to 126 NL_ports and 1 FL_port,
or 127 NL_ports, are configured in a unidirectional loop. Ports arbitrate for
access to the loop based on their AL_PA. Ports with lower AL_PAs have higher
priority than those with higher AL_PAs.
autoload When a tape cartridge is inserted, a tape drive with autoload will automatically
load it without the host having to send a load command. If a drive does not have
autoload, the drive will take no action until it receives a load command.
BOM Beginning Of Media. The first point on the tape that can be accessed by the
drive.
buffered mode A mode of data transfer in write operations that facilitates tape streaming. It is
selected by setting the Buffered Mode Field to 1 or 2 in the SCSI MODE SELECT
Parameter List header.
channel A means of data communication between processors and between processors
and peripherals. A channel provides a direct or switched point-to-point connection
between the communicating devices. A channel is typically hardware-intensive
and transports data at the high speed with low overhead. Contrast this with
Networks.
Volume 1: hardware integration 159
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