Glossary: Mostlyabreviations and acronyms:
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R: Red

RA: Route Arbiter

RADB: Routing Arbiter Database

RADIUS: Remote Authentication Dial In UserService; is a client/server protocol and software that lets remote accessservers communicate with a central server to authenticate dial-in usersand authorize their access to the requested system or service. RADIUS allowsa company to maintain user profiles in a central database that all remoteservers can share.  It provides better security, allowing a companyto set up a policy that can be applied at a single administered networkpoint. Having a central service also means that it's easier to track usagefor billing and for keeping network statistics.  Created by Livingston(now owned by Lucent), RADIUS is a de facto industry standard used by Ascendand other network product companies.

RADSL: Rate-Adaptive DSL;is an ADSL technology from Westell in which software is able to determinethe rate at which signals can be transmitted on a given customer phoneline and adjust the delivery rate accordingly. Westell's FlexCap2 systemuses RADSL to deliver from 640 Kbps to 2.2 Mbps downstream and from 272Kbps to 1.088 Mbps upstream over an existing line.

RAID: Redundant Array of Independent Disks

RAM: Random Access Memory

RARP: Reverse Address Resolution Protocol

RBOC: Regional Bell Operating Company; Thelocal telephone companies that were created as a result of the breakupof AT&T.Also referred to as Regional Bell Operating Company (BOC).

RCA: Radio Corporation of America

RE: Reality Engine, (SGI)

RED: Random Early Detection; gateways for congestionavoidance in packet-switched networks. The gateway detects incipient congestionby computing the average queue size. The gateway could notify connectionsof congestion either by dropping packets arriving at the gateway or bysetting a bit in packet headers. When the average queue size exceeds apreset threshold, the gateway drops or marks each arriving packet witha certain probability, where the exact probability is a function of theaverage queue size.

RED gatewayskeep the average queue size low while allowing occasional bursts of packetsin the queue. During congestion, the probability that the gateway notifiesa particular connection to reduce its window is roughly proportional tothat connection's share of the bandwidth through the gateway. RED gatewaysare designed to accompany a transport-layer congestion control protocolsuch as TCP. The RED gateway has no bias against burstytraffic and avoids the global synchronization of many connections decreasingtheir window at the same time. Simulations of a TCP/IPnetwork are used to illustrate the performance of RED gateways. Originalwork on RED, done by Sally Floyd and Van Jacobson, of the Lawrence BerkeleyNational Laboratory.  (see other papers of the Network Research Groupat:

RF: Radio Frequency

RFB: Remote Frame Buffer

RFC: Request for Comment; The name of the resultand the process for creating a standard on the Internet. New standardsare proposed and published on line, as a Request For Comments. The InternetEngineering Task Force, (IETF)is a consensus-building body that facilitates discussion, and eventuallya new standard is established, but the reference number/name for the standardretains the acronym RFC, e.g. the official standard for e-mail is RFC 822(IEEE). You can look-up RFC's, by number at:

RFI: Radio Frequency Interference

RFI: Radio Frequency Interface

RFS: Remote File System

RGB: Red-Green-Blue; A type of computer colordisplay output signal comprised of separately controllable red, green,and blue signals; as opposed to composite video, in which signals are combinedprior to output. RGB monitors typically offer higher resolution than compositemonitors.

RIFF: Rich IFF,(Microsoft's version of the Amiga IFFformat)

RIP: Routing Information Protocol

RIPE: Reseaux IP Europeens;is a collaborative organization that consists of European Internet providers. RIPE and other contributers have developed a database language called RIPE-181upon which all routing registries build their policies.

RISC: Reduced Instruction Set Computer/Computing

RMA: RealMedia Architecture; A streaming multimediaarchitecture created by Progressive Networks, ( products include; RealAudio, RealVideo.

ROSE: Remote Operations Service Element; Sub-layer6 ISO protocol, similar to RPC's.

RPC: Remote Procedure Call

RS: Route Server

RSA: Rivest-Shamir-Adleman; public-key cryptographicsystem developed by said.

RST: Renaissance Systems Technologies; Contractinghouse based out of Southfield, MI.

RTAP: Real-Time Application Protocol

RTF: Rich Text Format, (Microsoft)

RTNP: Real-Time Network Protocol

RTP: Real Time Protocol


RTSP: Real Time Streaming Protocol

RVSP: Resource ReSerVation Protocol; A protocolbeing used to ensure the end-to-end quality of service (QoS)demanded by multimedia applications with specific bandwidth and real-timedelivery requirements.

R-Y: Red minus Y (luminance), see B-Y,R-Y.

Last Update:12/13/03
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