Siemens PSFR-CP41 manual Clusters, Device, Differential, Domain, Exchange, Fabric, Fast/Wide Scsi

Glossary

Clusters

Two or more computers sharing the same resources on a communication link.

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.

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 PSFR-CP41 Fault LED comes on. After self test, if this LED remains on or comes on, the PSFR-CP41 has a problem with one of its components. During normal operation, this LED should be off. When the PSFR-CP41 is offline, this LED blinks.

Operating Manual U42093-J-Z716-1-74