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ii ATTO Technology Inc. Celerity FC Host Adapters Installation and Operation Manual
N_port a port attached to a node used with point to point or fabric configurations
NL_ port a port attached to a node in Fibre Channel arbitrated loop or fabric loop configuration
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
SAS Serial Attached SCSI: a serial SCSI bus technology and 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
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
SCSI Small Computer Systems Interface: a processor-independent standard for system-level interface
between a computer and intelligent devices including hard disks, floppy disks, CD-ROM, printers,
scanners, etc.
single-mode fiber an optical fiber with a small core which supports one wavelength (ray of light); the core radius is
nearly equal to the wavelength of the source
SNMP Simple Network Management Protocol: a standard for monitoring network-attached devices
topology logical layout of the parts of a computer system or network and their interconnections
transceiver a transmitter/receiver module
transfer rate the rate at which bytes or bits are transferred, as in megabytes or gigabits per second
Term Definition