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(suggestions for additions of acronyms or terms)
| Acronym | Description |
|---|---|
| RADIUS | Remote Authentication Dial In User Service. A security and authentication mechanism for remote access. |
| RADSL | Rate Adaptive Digital Subscriber Line |
| RAID | Redundant Array of Independent Drives |
| RARP | Reerse Address Resolution Protocol. The Internet protocol a diskless host uses to find its Internet address at startup. RARP maps a physical (hardware) address to an Internet address. |
| RBOC | Regional Bell Operating Company. |
| RBS | Robbed Bit Signaling is used in T1 circuits. Instead of having a specific timeslot dedicated to provide signal (as is true with ISDN) , signaling bits for on-hook and off-hook are within the sixth, twelfth, eighteenth and twenty-fourth frames of each time slot. RBS is sometimes called CAS (Channel Associated Signaling) because it takes bits from the bearer channels for signaling. |
| RD | Remote Defect Indication |
| RDOF | Rural Digital Opportunity Fund - For offical information, visit FCC site on RDO |
| reassembly | The process by which an IP datagram is "put back together" at the receiving host after having been fragmented in transit. |
| repeater | A device which propagates electrical signals from one cable to another without making routing decisions or providing packet filtering. In OSI terminology, a repeater is a Physical Layer intermediate system. |
| replication | The process of keeping a copy of data, either through shadowing or caching. |
| RFC | Request For Comments. The document series, begun in 1969, which describes the Internet suite of protocols and related experiments. Not all (in fact very few) RFCs describe Internet standards, but all Internet standards are written up as RFCs. |
| RFS | Remote file System. A distributed file system, similar to NFS, developed by AT&T and distributed with their UNIX System V operating system. |
| RIP | Routing Information Protocol. A protocol used to exchange routing information among a set of computers connected by a LAN. RIP uses hop counts as a routing metric. |
| RJ11 | A 4 position modular jack most commonly used for phone connections. The standard single line phone uses only 2 of the 4 wires. |
| RJ14 | is used with two line phones and leased line modems (physically an RJ11, but it uses 4 wires instead of 2) |
| RJ45 | An 8 position modular jack (picture) |
| RJ48C | Registration Jack This is an 8 position modular jack commonly used for connecting to 1.544 Mpbs Digital Service. |
| RJ48S | This is for DSU service at 64,000 bps or lower. Physically it is an RJ45. |
| rlogin | A service offered by Berkeley UNIX which allows users of one machine to log into other UNIX systems (for which they are authorized) and interact as if their terminals were connected directly. Similar to Telnet. |
| RMON | Remote Network Monitoring. Part of the SNMP network management framework. |
| robbed bit signaling | ( RBS ) Robbed Bit Signaling is used in T1 circuits. Instead of having a specific timeslot dedicated to provide signal (as is true with ISDN) , signaling bits for on-hook and off-hook are within the sixth, twelfth, eighteenth and twenty-fourth frames of each time slot. RBS is sometimes called CAS (Channel Associated Signaling) because it takes bits from the bearer channels for signaling. |
| ROADM | Re-configurable Optical Add-Drop Multiplexer |
| RoHS | Restriction of the use of certain Hazardous Substances in electrical and electronic equipment in the EU (European Union) market. This Directive bans the placing on the EU market new electrical and electronic equipment containing more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants. |
| ROI | Return on investment |
| RS-422 | is standard using full duplex differential signal on two pairs of wires. Maximum range 4000 ft. Maximum speed 10 Mbps. |
| RS485 | is a standard for half duplex data communications which is frequently used in multi-drop applications. Most commonly this is a 2-wire application. As many as 32 driver/receiver pairs can share a multidrop RS485 network. While many of the characteristics of RS485 are similar to RS422 the voltage range is greater. |
| RTMP | Routing Table Maintenance Protocol |
| RTT | Round-Trip Time A measure of the current delay on a network. |
| RTU | Remote Terminal Unit |
| routed | Route Daemon. A program that runs under 4.2 or 4.3BSD UNIX systems (and derived operating systems) to propagate routes among machines on a local area network. Pronounced "route-dee. |
| router | A system responsible for making decisions about which of several paths network (or Internet) traffic will follow. To do this, it uses a routing protocol to gain information about the network and algorithms to choose the best route based on several criteria known as "routing metrics." In OSI terminology, a router is a Network Layer intermediate system. Historically, routers were called "gateways" in Internet terminology. See bridge, gateway, repeater. |
| routing | The process of selecting the correct interface and next hop for a packet being forwarded. |
| routingmetric | The method by which a routing algorithm determines one route is better than another This information is stored in routing tables. Such tables include reliability, delay bandwidth, load, MTUs, communication costs, and hop count.. |
| RPC | Remote Procedure Call. A popular paradigm for implementing the client-server model of distributed computing. A request is sent to a remote system to execute a designated procedure, using arguments supplied, and the result returned to the caller. There are many variations and subtleties, resulting in a variety of different RPC protocols. |
| RS-232 | An EIA-specified physical interface with associated electrical signaling between DCE and DTE. The most commonly employed interface between computer devices and modems. While this term is still used, it is more correctly an EIA-232-D. |
| RS-449 | The physical connection for RS449 is generally a DB37. |
| RS-530 | The physical connector use for RS530 is generally a DB25. This superseded the RS-449. The RS-530 is a balanced interface that was designed to replace the more expensive V.35 connector. RS-530 can operate to speeds of 2 Mpbs. |
| RSA | A public-key cryptographic system which may be used for encryption and authentication. It was invented in 1977 and named for its inventors: Ron Rivest, Adi Shamir, and Leonard Adleman. |
| RSVP | Resource Reservation Protocol. RSVP is a control protocol for use in multimedia applications to indicate to transmitting nodes the nature (such as bandwidth, jitter, or maximum burstiness) of the packet streams that they want to receive. |
| RTFM | Read The Fantastic Manual. This acronym is often used when someone asks a simple or common question. The word "Fantastic" is usually replaced with a four letter variation and hand signals. |
| RTP | Real Time Transport Protocol. The standard protocol for streaming applications developed within the IETF. |
| RTS | equest to Send is a signal sent by one modem to another advising that the modem is available and requesting that data be sent. |
| RTSC | Read The Source Code. |