R
 | RACF Resource Access Control Facility
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| RAD Rapid Application Development Generally, object orientated software that allows for faster development of applications
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| RAD Remote Antenna Device
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| RADAR RAdio Detection And Ranging
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| RADIUS Remote Authentification Dial In User Service
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| RAID Redundant Arrays of Inexpensive Disks Levels of storage and storage security. Available from standard storage, RAID 0 to full redundant checking RAID 5
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| RAM Random Access Memory Fast access, on board memory as opposed to disk or tape
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| RAND RANDom number
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| RAND Reasonable And Non Discriminatory May or may not need to pay a fee and that it is at the discretion of the licence holder
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| RARP Reverse Address Resolution Protocol
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| RAS Remote Access Service
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| RASP Re,ote Antenna Signal Processing
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| RBS Robbed Bit Signaling
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| RBW Resolution BandWidth
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| RCC Radio Common Carrier
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| RD Receive Data
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| RDBMS Relational Data Base Management System
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| RDI Remote Defect Indicator
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| RDM Reverse Data Multiplexing
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| RDNIS Redirected Dial Number Id Service
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| RDRAM Rambus Dynamic Random Access Memory
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| RDS Remote Data Service An internet data access tool
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| RDS Radio Digital System
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| REA Rural Electrification Administration
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| REL RELease message
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| REN Ringer Equivalence Number
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| RF Radio Frequency
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| RF Royalty Free Not conditional on payment of fees
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| RFC Request For Comment
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| RFI Radio Frequency Interference
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| RFP Request For Proposal
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| RFU Reserved for Future Use
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| RGB Red Green Blue A video signal that can be separated into Red, Green and Blue |
| RI |
Ring Indicator
| RI |
Routing Information
| RID |
Registered Identifier
| RIMM |
Rambus Inline Memory Module
| RIN |
Relative Intensity Noise
| RIP |
Routing Information Protocol
| RISC Reduced Instruction Set Computing Instruction chipset designed to increase speed of processing |
| RLOGIN |
Remote LOGIN
Unix
| RLP |
Radio Link Protocol
| RM |
Remote Management
| RM |
Rate Management
| RMON |
Remote Monitoring
| RMS Root Mean Square
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| RNR Receive Not Ready
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| ROI Return On Investment The amount of money or effort returned for that which was put in
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| ROM Read Only Memory Chip or storage medium whose files / instructions cannot be altered. |
| RPC |
Remote Procedure Call
| RPCHOF |
Remainder Polynomial Coefficients Highest Order First
| RR |
Receive Ready
| RRAS |
Routing and Remote Access Service
| RRQ |
Registration ReQuest
| RSA |
Rural Service Area
| RSFG |
Route Server Functional Group
| RSI |
Repetitive Strain Injury
| RSSI |
Receive Signal Strength Indication
| RSVP |
Resource Reservation Protocol
| RTC Real Time Clock
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| RTCP Real time Transport Control Protocol
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| RTF Rich Text Format Word processing format. Basic text
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| RTM Response Time Monitor
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| RTOS Real Time Operating System
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| RTP Real Time Protocol
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| RTPM Real Time Performance Monitor
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| RTS Request To Send
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| RTSP Real Time Streaming Protocol
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| RTU Remote Test Unit
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| RX |
Receiver