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half duplex
A communication protocol which allows transmission in both directions, but only one
direction at a time
host
A processor, usually a CPU and memory, which communicates with devices over an interface
initiator device
A component which originates a command
LED
Light-emitting diode: a type of diode that emits light when current passes through it; visible LEDs are used as
indicator lights on all sorts of electronic devices
LUN
Logical Unit Number: an identifier for a logical unit (0-7)
MAC
Media Access Controller
MAC Address
A unique address assigned to an ethernet device
multi-mode fiber
An optical fiber which can carry several beams of light at once
N_port
A port attached to a node used with point to point or fabric configurations
originator
An initiating device; a component which originates a command
parity checking
A method which verifies the accuracy of data transmitted over the SCSI bus by adding one bit in the transfer
to make the sum of all the bits either odd or even (for odd or even parity); an error message occurs if the sum
is not correct
PCI
Peripheral Component Interconnect. Allows peripherals to be connected directly to computer memory,
bypassing the slower ISA and EISA busses
point-to-point
A topology where two ports communicate
port
An access point in a device: see N_port, NL_port, etc.
port address
Also port number; the address, assigned by the PCI bus, through which commands are sent to a host adapter
board
port number
See port address
receiver
The ultimate destination of data transmission; a terminal device
scatter/gather
A device driver feature which allows the host adapter to modify a transfer data pointer so that a single host
adapter can access many segments of memory, minimizing interrupts and transfer overhead
SAS
Serial Attached SCSI: a serial SCSI bus technlogy anod point to point architecture for connecting host bus
adapters to storage devices
SATA
Serial AT Attachment: a serial ATA bus technology and point to point architecture for connecting host bus
adapters to storage devices
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