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Jargon Buster
The du Pré Jargon Buster found the following for - RNos A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Term
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Explanation
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| R & TTED | Radio & Telecommunications Terminal Equipment Directive. This body superceded the TTED in April 2000. It is not legal to sell a product within the United Kingdom which does not conform to this directive. Hence, a product should carry a CE mark | |
| R reference point | An ISDN term. The interface between a non-ISDN device and a TE1 | |
| RAID | Redundant Array of Inexpensive Disks. Effectively, a bank of hard disks. Data is split between them to protect in case of disk failure | |
| RAM | Random Access Memory. The working memory of a PC that temporarily stores software and data whilst it is being worked on. Once the PC is turned off, this information is lost unless it has been saved to a more permanent medium | |
| RARP | Reverse Address Resolution Protocol. A link layer mechanism used by many diskless Sun workstations to find IP addresses and download hosts. The protocol is only suitable for LANs | |
| RAS | Remote Access Server | |
| RCF | see BT Remote Call Forwarding | |
| Recall | A signal to a telephone system to place a call on hold and return internal dial tone to the user. Either Earth or Time Break recall on analogue systems | |
| Recommendation Q.931 | see Q.931 | |
| Red Book | The 1984 compilation of the CCITT's recommendations for international telecommunications, including some for ISDN. Superseded by the Blue Book | |
| Red Care | see BT Red Care | |
| Red Triangle | If a piece of equipment is not approved by BABT for connection to a PTO’s network, the label must state as much, and display a large red triangle | |
| Refresh Rate | Refers to the quality of the screen or monitor. The rate at which the image is renewed. The higher the rate, the less the flicker | |
| Register Recall | A outdated term for Timed Break Recall | |
| Registration Authority | A Registration Authority (RA) is an authority in a network that verifies user requests for a digital certificate and tells the see certificate authority to issue it. RAs are part of a public key infrastructure (PKI), a networked system that enables companies and users to exchange information and money safely and securely. | |
| Remote Device | A peripheral device, such as a printer or CD-ROM, that is directly connected to the server rather than a workstation | |
| Remote Diagnostics | The facility to access the program of a piece of equipment indirectly, usually by dialling into it using a telephone line and modem. Typically associated with a telephone system or computer. Hence, the ability to interrogate and change the program from off-site, remotely. Another term for Remote Programming | |
| Remote Programming | see Remote Diagnostics | |
| REN | Ringing Equivalent Number. A measurement of power required to ring a POT. Every device which requires ringing power has its REN value printed on it. Note that BT warrants a REN of 4 on an exchange line, and most POTs are around 1. Telephone systems often only give a REN of 1 | |
| Repeater | A device used to extend transmission distances by restoring signals to their original size and shape. Typically used within Ethernet networks to extend segment lengths | |
| Res | A BT term. Residential | |
| RF | Radio Frequency | |
| RFC | Request For Comments. One of a series, begun in 1969, of numbered Internet informational documents and standards widely followed by commercial software and freeware in the Internet and Unix communities. Few RFCs are standards but all Internet standards are recorded in RFCs. Perhaps the single most influential RFC has been RFC 822 , the Internet electronic mail format standard | |
| Ring | A type of network topology that consists of a single cable that connects to all the devices on a network | |
| Ring Back | see BT Ring Back | |
| Ring Generator | A Telephone Accessory. Connects either to a PSTN exchange line or POT port of a telephone system, to boost the REN value | |
| RIP | Routing Information Protocol. Widely used protocol for managing interconnected groups of LANs. A router sends its entire routing table to its closest neighbour every 30 seconds. The neighbour will pass this to the next, and so on, until all have the same knowledge. This is known as network convergence. RIP uses a hop count to determine network distance. Considered an effective solution for small networks, but for complex networks an alternative is the Open Shortest Path First (OSPF) Protocol | |
| RISC | Reduced Instruction Set Computer chips are processor chips designed to offer a high level of performance without using as much processor power | |
| Riser | An open, accessible duct specifically for cables to pass through a floor. Often referred to as a Services Duct | |
| Rivest Shamir Adleman | see RSA. | |
| RJ45 | The 8-pin plug and socket type used for ISDN termination with Q.931. The international standard is ISO/IS 8877 (1987) | |
| Roaming | A cellular radio term. Service offered by most cellular service providers, allowing users to use their phone even if they are not in their home coverage area. In general, using a phone while "roaming" incurs additional fees, though some service providers offer national roaming for free on some service plans. When a phone is in a "roaming area", it usually displays an indicator light or logo such as "R" or "ROAM". An increasing number of phones offer what is called Internation or Global Roaming, since it allows users to make and receive phone calls from virtually any country | |
| ROM | Read Only Memory. Memory which can be read but not written to | |
| Router | An intelligent device which provides connection between LANs choosing the most appropriate method available. E.g., via the X.25 network, or ISDN | |
| Routing | The process of delivering a message across a network or networks via the most appropriate path. Whilst simple in principle, routing is a specialised, complex science, influenced by a plethora of factors. The more networks are joined together, the more esoteric routing is set to become | |
| RPD | Remote Programming and Diagnostics. The ability to access a system’s programming remotely, by modem, and make changes | |
| RS232 | An EIA standard which is the most common way of linking data devices together. The connection to an RS232 is usually limited to a maximum of 50 feet. An interface for linking DCEs and DTEs, it defines the electrical characteristics of the signals from such devices. RS232 us suitable for both synchronous and asynchronous communications and specifies a 25 pin connector, traditionally the DB-25. Twenty of the pins carry out routine system operation while the rest are reserved for modem testing or unallocated. For this reason it is never safe to assume that two RS232 devices will work together. Newer, more compact RS232 interfaces have nine pins only, and an adaptor card is needed. It is functionally similar to the CCITT's V.24 and V.28 standards |
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| RS422 | An EIA recommended standard to extend the RS232 50 feet connection limit. It is most commonly implemented on 25 pin connectors (DB-25s) and is electrically compatible with the CCITT V.11 standard | |
| RS423 | The EIA recommended standard for cable lengths that extend the RS232 50 feet limit. It was introduced in tandem with RS422 but is not widely used. Electrically compatible with the CCITT's V.10 recommendation | |
| RSA | Rivest Shamir Adleman. One of the fundamental encryption algorithms or series of mathematical actions developed in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman. The RSA algorithm is the most commonly used encryption and authentication algorithm and is included as part of the Web browsers from Netscape and Microsoft. | |
| RSVP | An Internet Protocol. Resource Reservation Prorocol |