| Word | Description |
| RAID 1 | RAID 1 (Redundant Array of Independent Disks Level 1) writes identically data to two drives to protect against data loss from a single disk drive failure. |
| RAID 5 | RAID 5 (Redundant Array of Independent Disks Level 5) writes data to three or more hard disk drives to allow data to be recovered from a hard disk drive failure. |
| RAID 5 Board | An interface board that allows RAID5 to be utilised on a recorder. |
| Remote Access | The ability of a computer in one location to connect to a device at another location or site. |
| Roll | A loss of vertical synchronization which causes the picture to move up or down on a receiver or monitor. |
| router | A network hardware device that routes traffic between LANs and WANs |
| RS-232 | A commonly used computer serial interface. A data communication industry standard for the serial transmission of information. Distance without modems is limited. |
| RS-422 | EIA interface standard that generally operates in conjunction with RS-449 and specifies electrical characteristics for balanced circuits and extends transmission speeds and distances beyond RS-232/V.24. RS-422 is a balanced voltage system with a high level of noise immunity. |
| RS-485 | Balanced interface similar to RS-422/V.11 but using tri-state drivers for multidrop applications. |
| Rugby Clock | Radio signal to synchronize equipment clocks accurately and that automatically adjusts the BST setting. |