Virtual TapeServer SCSI-to-FC Adapter User Manual

GL-2
Glossary
D
device See FC Device or SCSI Device.
differential An electrical signal configuration using a pair of lines for data
transfer. The advantage of differential compared to single-ended
configuration is a relative high tolerance for common-mode
noise and crosstalk when used with twisted pair cables. In
layman’s terms, this means longer distance.
domain A FC term describing the most significant byte in the N_Port
Identifier for the FC device. It is not used in the FC-SCSI
hardware path ID. It is required to be the same for all SCSI
targets logically connected to a FC adapter.
E
exchange A FC term for the basic mechanism used for managing an
operation. An exchange identifies information transfers
consisting of one or more related nonconcurrent sequences that
may flow in the same or opposite directions, but always in half
duplex mode. An exchange is identified by an OX_ID and an
RX_ID.
F
fabric An FC term that includes FC Arbitrated Loop, Switched Fabric,
and Point-to-Point.
fault LED During power up and self test, the VT5900-SA Fault LED comes
on. After self test, if this LED remains on or comes on, the
VT5900-SA has a problem with one of its components. During
normal operation, this LED should be off.
FC See Fibre Channel.
FC-AL See Fibre Channel - Arbitrated Loop.
FC adapter A printed circuit assembly that translates data between the FC
host processor’s internal bus and the FC link. This is also known
as an HBA, or Host Bus Adapter.
FC device A device that uses Fibre Channel communications.
FC port An opening at the back of the VT5900-SA that provides a fiber
optic connection between the FC adapter and the FC host.