Dell PowerVault 35F User Manual page 82

Glossary: Dell PowerVault 35F User's Guide
Device
See FC 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.
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 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.
Fabric
A FC term describing a switched topology, which is one of the three existing FC topologies. Fabric
elements interconnect various N_Ports or NL_Ports and are responsible for frame routing.
Fast/Wide SCSI
"Fast" and "Wide" are relative terms in comparing previous SCSI standards and products. "Fast," as
defined in SCSI-2, refers to a maximum synchronous transfer rate of 10 MHz. "Wide" refers to a data path
of 16 bits.
Fault LED
During power up and self test, the PowerVault 35F Fault LED comes on. After self test, if this LED
remains on or comes on, the PowerVault 35F has a problem with one of its components. During normal
operation, this LED should be off. When the PowerVault 35F is offline, this LED blinks.
FC
See Fibre Channel.
FC-AL
See Fibre Channel - Arbitrated
FC Adapter
A printed circuit assembly that translates data between the FC host processor's internal bus and the FC
link.
FC Device
A device that uses Fibre Channel communications.
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or SCSI Device.
Loop.