Brocade SAN Glossary for Fabric OS v6.0.0

Brocade SAN Glossary 1/29/2008 Page 23 of 29

R_T_TOV Receiver Transmitter Timeout Value. Used by the receiver logic to detect loss

of synchronization between transmitters and receivers.

Radius The greatest “distance” between any edge switch and the center of a fabric.

RAID Redundant Array of Independent Disks. Disks that look like a single or

multiple volumes to the server and are fault-tolerant either through mirroring

or parity checking.

RAIT Redundant Array of Independent Tapes.

RBAC Role-Based Access Control.

Receiver A device that does detection and signal processing.

Redundancy Having multiple occurrences of a component to maintain high availability.

Remote switch An optional product for long distance fabrics requiring a Fibre Channel-to-

ATM or SONET gateway.

Repeater A circuit that uses recovered clock to regenerate and transmit an outbound

signal.

Resilient core/edge topology

Two or more switches acting as a core to interconnect multiple edge

switches, nodes attach to the edge switches.

Responder The N_Port with which an Exchange originator wishes to communicate.

Retimer A circuit that uses an independent clock to generate outbound signals.

Root zone database The zone database from a pre-Fabric OS 5.2.0 fabric; once Fabric OS 5.2.0

or later is installed, the root zone database is owned by AD0.

Route A path between two switches.

Routed fabric Two or more edge fabrics interconnected by one or more backbone fabrics.

Routing The assignment of frames to specific switch ports, according to frame

destination.

RSCN Registered State Change Notification. A switch function that allows

notification to registered nodes if a change occurs either with or within the

fabric.

RTWR Reliable Transport With Response.

RX_ID Responder Exchange Identifier. A 2-byte field in the frame header that may

be used by the responder of the Exchange to identify frames as being part of

a particular exchange.

S_ID Source Identifier. A 3-byte field in the frame header used to indicate the

address identifier of the N_Port from which the frame was sent.

SA Security Association. The collection of security parameters and

authenticated keys negotiated between IPsec peers.