Telecommunications terms starting with R

465 terms

  1. reference frequency A standard fixed frequency from which operational frequencies may be derived or with which they may be compared.
  2. reference model A set of conventions and concepts, mutually agreed upon between the information system user and provider communities [POSIX.0].
  3. Reference Monitor The security engineering term for IT functionality that 1) controls all access, 2) cannot be by-passed, 3) is tamper-resistant, and 4) provides confidence…
  4. reference monitor concept 1. An access control concept that refers to monitoring of all accesses to objects by subjects [CESG]. 2.
  5. reference monitoring An access control concept utilizing an abstract machine to mediate all access to objects by subjects.
  6. reference noise The magnitude of circuit noise chosen as a reference for measurement. Note: Many different levels with a number of different weightings are in current…
  7. reference point In ISDN, a logical point between two, nonoverlapping functional groups. Note: When equipment is placed at a reference point, that reference point is…
  8. reference surface In optical-fiber technology, that surface of an optical fiber that is used to contact the transverse-alignment elements of a component such as a connector…
  9. reference system A group of related reference circuits.
  10. reference transmission level point See relative transmission level, transmission level point.
  11. reference validation mechanism [The] Portion of a trusted computing base whose normal function is to control access between subjects and objects and whose correct operation is essential…
  12. reference waveform The artificially generated time history of an earthquake, derived from the histories of many actual earthquake accelerometers.
  13. reference white level [In television,] The level corresponding to the specified maximum excursion of the luminance signal in the white direction. [47CFR]
  14. Reflectance The amount (percent) of light that is reflected by a surface relative to the amount that strikes it.
  15. reflected code Synonym Gray code.
  16. reflecting layer In the ionosphere, a layer that has a free-electron density sufficient to reflect radio waves.
  17. reflecting loss See reflection loss.
  18. reflection The process whereby radiation (or other waves) incident upon a surface is directed back into the medium through which it traveled.
  19. reflection coefficient (RC) The ratio of the amplitude of the reflected wave and the amplitude of the incident wave. 2.
  20. reflection loss At a discontinuity or impedance mismatch, e.g., in a transmission line, the ratio of the incident power to the reflected power.
  21. reflective array antenna An antenna, such as a billboard antenna, in which the driven elements are situated at a predetermined distance from a surface designed to reflect the…
  22. Reflectivity The measure of the efficiency of a radar target in intercepting and returning Electro Magnetic Energy.
  23. Reflector A component of a solar energy facility that reflects incident sunlight to a desired location or component within the facility, allowing it to be converted…
  24. refracted ray A ray that undergoes a change of velocity, or in the general case, both velocity and direction, as a result of interaction with the material medium in…
  25. Refraction The change in direction of a ray of light when it passes through one media to another with differing optical densities.
  26. refraction profile Synonym refractive index profile.
  27. refractive index (η, n) Of a medium, the ratio of the velocity of propagation of an electromagnetic wave in vacuum to its velocity in the medium. Synonym index of refraction.
  28. refractive index contrast In an optical fiber, a measure of the relative difference in refractive index of the core and cladding.
  29. refractive index profile Of the cross section of an optical fiber, the description, i.e., plot, of the value of the refractive index as a function of distance from the fiber axis…
  30. reframing time The time interval between the instant at which a valid frame-alignment signal is available at the receiving data terminal equipment and the instant at…
  31. refresh To reproduce, repeatedly, a display image on a display surface, so that the image remains visible.
  32. refresh packets Signaling packets that are transmitted on a periodic basis across a permanent virtual circuit in the direction of transmission from the channelized side…
  33. regeneration In biology, regrowth of damaged or destroyed tissue or body part.
  34. regenerative feedback Feedback in which the portion of the output signal that is returned to the input has a component that is in phase with the input signal.
  35. regenerative repeater A repeater, designed for digital transmission, in which digital signals are amplified, reshaped, retimed, and retransmitted. Synonym regenerator.
  36. regenerator Synonym regenerative repeater. 2. A device that reconstructs and retransmits a received pulse train. [T1.403-1989]
  37. Regional Bell Operating Company (RBOC) Historically, one of the seven holding companies formed by divestiture by the American Telephone and Telegraph Company of its local Bell System operating…
  38. regional center See office classification.
  39. register a record book; it is also the county official charged with keeping record copies of legal instruments such as property deeds and other records.
  40. registered jack (RJ) Any of the series of jacks, described in the Code of Federal Regulations, Title 47, part 68, used to provide interface to the public telephone network.
  41. Registration Lining up a forms image to determine which fields are where. Also, entering pages into a scanner such that they are correctly read.
  42. registration agent (RA) An application process that receives an RRP (registration request protocol), message from the registration manager signaling it to start automatic…
  43. registration authority In networking, an organization that performs registration for information objects and devices. [After 2382-pt.35]
  44. registration manager (RM) An application process responsible for contacting the registration agent using the RRP (registration request protocol) to start automatic registration of…
  45. registration procedure In networking, the procedure for performing registration or for amending or deleting existing registrations. [2382-pt.35]
  46. registration program See FCC Registration Program.
  47. rekeying The changing of one or more keys that are used for either COMSEC or TRANSEC functions.
  48. relational database A method of structuring data as collections of tables that are logically associated to each other by shared attributes.
  49. relative address In computer and data processing programming, an address that is expressed as a difference in relation to a base address. [After Weik '96]
  50. relative error The ratio of an absolute error to the true, specified, or theoretically correct value of the quantity that is in error.
  51. relative spectral width See spectral width.
  52. relative transmission level The ratio of the signal power, at a given point in a transmission system, to a reference signal power.
  53. Relay Allows an SMTP server to accept any email destined for other hosts and re-deliver that mail to the proper host, much like a feild and track relay race…
  54. relay configuration An operating configuration in which a circuit is established between two stations via an intermediate relay station.
  55. relay station An intermediate station that passes information between terminals or other relay stations. 2.
  56. release node The initial destination of a call from a pivot node. Note: A service or network capability provided at the release node, after determining the call should…
  57. release prefix [A] prefix appended to the short title of U.S.-produced keying material to indicate its foreign releasability.
  58. release time The time interval between (a) the instant that an enabling signal (as in a vogad or echo suppressor) is discontinued, and (b) the instant at which…
  59. release timer A timer that specifies the period of time the network will wait for a release from the user after informing the user of a failure condition such as busy.
  60. released loop Synonym switched loop.
  61. Reliability The consistency of a measure or question in obtaining very similar or identical results when used repeatedly; for example, if you repeated a blood test…
  62. reliability (performance) See performance reliability.
  63. reliability assessment The process of determining whether existing hardware, firmware, or software has achieved a specified level of operational reliability. 2.
  64. reliability evaluation Synonym reliability assessment.
  65. remanence 1. Residual information remaining on storage media after clearing. [INFOSEC-99] 2.
  66. Remote Access The ability to access and use digital information from a location off-site from where the information is physically located.
  67. remote access data processing Data processing in which some input/output functions are performed by devices that are connected to a computer system by means of data communication.
  68. remote access line An access line (e.g., for WATS or TWX service) between a subscriber's premises in one toll rate center and a serving central office located in a different…
  69. remote alarm In a PVP (packetized voice protocol) node, an indication that the far-end PVP node is experiencing an alarm condition.
  70. remote alarm indication (RAI) A signal transmitted in the outgoing direction when a terminal determines that it has lost the incoming signal.
  71. remote AllCall registration A feature that enables the UPT user to make a remote Incall registration and a remote OutCall registration to the same terminal address using one single…
  72. remote batch entry Submission of batches of data through an input unit that has access to a computer through a data link.
  73. remote batch processing Batch processing in which input-output units have access to a computer through a data link.
  74. remote boot Of a computer, its start or restart from a remote location. Note: A remote boot may be accomplished by a hardware or software trigger.
  75. remote call forwarding A service feature that allows calls coming to a remote call-forwarding number to be automatically forwarded to any answering location designated by the…
  76. remote clock A clock that is remote from a particular facility, such as a communications station or node, with which it is associated. 2.
  77. remote control equipment Devices used to perform monitoring, controlling, and/or supervisory functions, at a distance.
  78. remote defect indication (RDI) A signal transmitted at the first opportunity in the outgoing direction when a terminal detects specific defects in the incoming signal. [T1.231-1997]
  79. remote digital terminal (RDT) 1. An intelligent network element that interfaces between customer access lines and digital facilities. [T1.508-1998] 2.
  80. remote failure indication (RFI) A signal transmitted in the outgoing direction when a terminal determines that specific defects have persisted long enough to declare a received signal…
  81. remote job entry (RJE) In computer operations, a mode of operation that allows execution of job instructions received from a remote site and return of the output to the same or…
  82. remote line location A remotely located subscriber line access unit which is normally dependent upon the central processor of the host office for call processing functions.
  83. remote linked registration A feature by which a linked registration for one specified terminal address can be carried out from another terminal address. [T1.701-1994]
  84. remote login A login that allows a user terminal to connect to a host computer via a network or direct telecommunications link, and to interact with that host computer…
  85. remote logon Synonym remote login.
  86. remote operations service element (ROSE) protocol A protocol that (a) provides remote operation capabilities, (b) allows interaction between entities in a distributed application, and (c) upon receiving a…
  87. remote orderwire An extension of a local orderwire to a point convenient for personnel to perform required operational and maintenance functions.
  88. Remote Procedure Call (RPC) A Remote Procedure Call (RPC) is a communication mechanism which allows one UNIX process to communicate with another UNIX process.
  89. remote rekeying The encrypted transmission of keys from a remote source. 2. [A] procedure by which a distant crypto-equipment is rekeyed electrically. [INFOSEC-99]
  90. remote switching unit (RSU) The subtending remote switching device that depends in part on its host switch for call control but is capable of providing intra-unit switching. [T1.
  91. remote terminal The location at which there is a transition between a telecommunications carrier facility and the local lines serving the individual customers. [T1.
  92. remote trunk arrangement (RTA) Arrangement that permits the extension of TSPS functions to remote locations. [47 CFR Pt.36A]
  93. remote-network element (R-NE) A type of network element (NE) that contains a DUA (directory user agent), an optional local cache, and possibly other application processes such as the…
  94. REN Acronym for ringer equivalency number.
  95. reorder (RO) A call-disposition category for a call processing failure. [T1.207-1998]
  96. reorder tone See busy signal.
  97. repeat-request (RQ) system Synonym ARQ.
  98. repeater An analog device that amplifies an input signal regardless of its nature, i.e., analog or digital. 2.
  99. repeating coil A voice-frequency transformer characterized by a closed core, a pair of identical balanced primary (line) windings, a pair of identical but not…
  100. reperforator In teletypewriter systems, a device used to punch a tape in accordance with arriving signals, permitting reproduction of the signals for retransmission.