Virtual TapeServer SCSI-to-FC Adapter User Manual

GL-5
Glossary
loop address A FC term indicating the unique ID of a node in Fibre Channel
loop topology, sometimes referred to as a Loop ID. Also a status
type in the FC Status Menu, showing the FC Loop Address of
the VT5900-SA.
loop port (nl_port) A FC port that supports loops.
LUN Logical Unit Number or Logical Unit; a subdivision of a SCSI
target. For SCSI-2, each SCSI target supports up to sixteen
LUNs (LUN-0 to LUN-15). Using LUNs, the FC host can
address multiple peripheral devices that may share a common
controller.
LVD/SE Low Voltage Differential/Single-Ended
M
management information
base (MIB)
A structured set of data variables, called objects, in which each
variable represents some resource to be managed. A related
collection of resources to be managed.
mapping table A table which is indexed by sequential LUN values, indicating
selected BUS:TARGET:LUN devices. It is used by the VT5900-
SA to perform Fibre Channel-to-SCSI operations by default.
MB megabyte. (There are 8 bits in a byte.)
MIB See Management Information Base.
motherboard The main PCA of the VT5900-SA that provides a physical and
logical connection between Fibre Channel and SCSI devices.
multiplexer A device that allows two or more signals to be transmitted
simultaneously on a single channel.
N
N_port A FC term defining a “Node” port. A FC-defined hardware
entity that performs data communication over the FC link. It is
identifiable by a unique Worldwide Name. It can act as an
originator or a responder.
N_port identifier A FC term indicating a unique address identifier by which an
N_Port is uniquely known. It consists of a Domain (most
significant byte), an Area, and a Port, each 1 byte long. The
N_Port identifier is used in the Source Identifier (S_ID) and
Destination Identifier (D_ID) fields of a FC frame.