TapeAlert A set of 64 flags is held in the TapeAlert log that indicate faults or predicted
faults with the drive or the media. By reading this log, host software can inform
the user of existing or impending conditions, and can, for example, advise the
user to change the tape.
transceiver A device used to convert electrical signals in the drive to optical signals for
transmission in a fibre optic cable. Used in Fibre Channel drives only.
ULP Upper Level Protocol. The protocol which runs on top of Fibre Channel. Typical
ULPs running over Fibre Channel are SCSI (Small Computer System Interface),
IP (Internet Protocol), HIPPI (High Performance Parallel Interface, and IPI (Intelligent
Peripheral Interface).
VHD Very High Density
zoning A logical grouping of fabric-attached devices that is isolated from other devices
and other zones by the switch.
Volume 1: hardware integration 163
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