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N1200-320 4Gb Network Storage Router user and service guide 123
Glossary
adapter A printed circuit assembly that translates data between the FC host processor’s internal bus and
a different bus, such as SCSI.
address See SCSI addressing.
addressing mode Used to create a mapping table that maps devices on the SCSI bus to Fibre Channel logical
units.
AL_PA Arbitrated Loop Physical Address. A unique one-byte valid value, derived and used in an
Arbitrated Loop Topology as defined in ANSI specification FC_AL ver 4.5.
arbitrated loop See Fibre Channel - Arbitrated Loop. (ANSI specification FC_AL ver 4.5)
area The second byte of the N_Port Identifier.
auto-assigned
mapping
A menu item. The auto-addressing option creates a mapping table using devices discovered
upon powering up or resetting the network storage router, that is not otherwise retained by the
network storage router.
baud A unit of signaling speed, expressed as the maximum number of times per second the signal
can change the state of the transmission line or other medium (units of baud are sec
-1
). Note:
With Fibre Channel scheme, a signal event represents a single transmission bit.
bus A means of transferring data between modules and adapters or between an adapter and SCSI
devices. For a SCSI bus definition, see SCSI bus.
channel A general term for a path on which electronic signals travel.
clusters Two or more computers sharing the same resources on a communication link.
interface
card-to-router
Configuration involving at least two interface cards/routers where one interface card/router is
in Initiator Mode and another in Target Mode.
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.
exchange A FC term for the basic mechanism used for managing an operation. An exchange identifies
information transfers consisting of one or more related non concurrent 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.
fabric An FC term that includes FC Arbitrated Loop, Switched Fabric, and Point-to-Point.
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.