1 HV Installation and Operations Guide

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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). With Fibre Channel scheme, a signal event

represents a single transmission bit.

bridge A device which selectively forwards data between networks based on

administratively defined preferences. The forwarding decision is based on

paths between address mappings among dispersed devices. Storage bridges

focus on the SAN environment. See Storage Bridge.

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.

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.

differential SCSI A type of SCSI cable that can go a maximum of 25 meters.

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.