Telecommunications — page 65 of 85

8,405 terms including subtopics (8,400 terms filed directly here)

Subtopics

Telecommunications terms

  1. request data transfer A signal sent by the DTE to the DCE to request the establishment of a data connection.
  2. request-repeat (RQ) signal A signal from a receiver to a transmitter asking that a message be transmitted again. [From Weik '89]
  3. request-to-send signal A signal that is generated by a receiver in order to condition a remote transmitter to commence transmission. [From Weik '89]
  4. requests See click-through.
  5. reradiation Radiation, at the same or different wavelengths, i.e., frequencies, of energy received from an incident wave. 2.
  6. rerouting Recommencement of route selection from the first point of routing control, when congestion is encountered at some intermediate switching point in the…
  7. resale carrier A company that redistributes the services of a commercial carrier and retails the services to the public.
  8. resale service In FCC deliberations and rulings, the right of a buyer of basic telecommunication services, such as private lines, foreign exchanges, or WATS, to resell…
  9. resampling The process of reducing image data set size by representing a group of pixels with a single pixel.
  10. reseller Any access customer who resells the access service obtained from an exchange carrier. [T1.251-1996]
  11. reserve capacity Installed capacity of a system which is not normally utilized but can be made available when required.
  12. reserve keying material Key held to satisfy unplanned needs. [INFOSEC-99]
  13. reserved circuit service In ISDN applications, a telecommunications service that establishes a communication path at a preset time (requested by the user) in response to a…
  14. Reserved Numbers Reserved numbers are numbers that are held by service providers at the request of specific end users or customers for their future use.
  15. reserved word A word reserved for a particular purpose in Java, such as class, int, public, etc. Such words may not be used as ordinary identifiers.
  16. reset mode The parameters initially programmed for basic operation.
  17. resettability A measure of the ability to duplicate controllable conditions. Note: An example of resettability is the ability to reset the frequency controls of radio…
  18. resident Pertaining to computer programs that remain on a particular storage device.
  19. residual error rate Synonym undetected error ratio.
  20. residual error ratio The ratio of (a) the number of bits, unit elements, characters, or blocks incorrectly received but undetected or uncorrected by the error-control…
  21. residual modulation Synonym carrier noise level.
  22. Residual Risk The remaining, potential risk after all IT security measures are applied. There is a residual risk associated with each threat.
  23. residue 1. See: polymer. 2. Materials remaining after degradation and/or attempted removal, e.g. pesticide residues in food.
  24. resistance hybrid A network of resistors to which four branches of a circuit may be connected to make them conjugate in pairs.
  25. Resolution See DPI.
  26. resolver Computer software that allows user programs to interface with domain name servers. Note: The user program may be, for example, an FTP client. [2382-pt.35]
  27. resolving power A measure of the ability of a lens or optical system to form separate and distinct images of two objects with small angular separation.
  28. resonance The state of a system in which an abnormally large vibration is produced in response to an external stimulus, occurring when the frequency of the stimulus…
  29. resonant antenna Synonym periodic antenna.
  30. resonant cavity See optical cavity.
  31. resource Data, metadata, a collection of data, or a collection of metadata accessed as a content item. Examples: a document, a database table, a content class.
  32. resource authority An authority recognized in a Security Domain as a trusted source of security information which relates to resources (security object) [ECMA138].
  33. resource controller (RC) The processor(s) that control access to satellite payload communications resources within an individual satellite program.
  34. resource record Also called resource record set. Standard DNS terminology. See Also http://en.wikipedia.org/wiki/Domain_Name_System.
  35. respond opportunity In data transmission, the link level logical control condition during which a given secondary station may transmit a response.
  36. response frame In data transmission, all frames that may be transmitted by a secondary station.
  37. response PDU A protocol data unit (PDU) transmitted by a logical link control (LLC) sublayer in which the PDU command/response (C/R) bit is equal to "1".
  38. Response spectrum A plot of the maximum response of a series of single-degree-of-freedom damped oscillators (elastic systems) as a function of their natural periods, or…
  39. Response Time The amount of time in which it will take a watershed to react to a given rainfall event.
  40. response timer (TK) In multilevel precedence and preemption, the device that controls the length of time that the call receiver of the precedence call has to accept the…
  41. Responsible Organization (Resp Org) The entity designated to manage and administer a Customer's SMS/800 records.
  42. responsiveness Ability of an entity to provide service within the required time. Note: The term timeliness is sometimes used incorrectly to mean responsiveness.
  43. responsivity In a photodetector, the ratio of the electrical output to the optical input. Note 1: Responsivity is usually expressed in amperes per watt, or volts per…
  44. Restart The waving of the green flag after a caution period.
  45. Restitution Act of restoring anything to its rightful owner; the act of restoring someone to an economic position he enjoyed before he suffered a loss.
  46. restoral limit (RL) The bound on performance that is allowed when corrective action is taken to restore a parameter after an IAL (immediate action limit) failure.
  47. Restoration The process of returning, as nearly as possible, a building or any of its parts to its original form and condition.
  48. Restoration Priority (RP) Describes supremacy given to some Government and National Security circuits.
  49. restricted access A limitation on access to records or to information of a specified type imposed by general or specific requirements See also classified record…
  50. restricted area Synonym controlled space.
  51. restricted channel In digital communications systems, a channel that has a useful capacity of only 56 kb/s (kilobits per second), instead of 64 kb/s.
  52. restriction certificate In secure systems, an authorization certificate that indicates the security restrictions on documents and transactions that an entity may authorize.
  53. retransmission buffer Storage in the signaling link control for signal units that have been transmitted but not yet positively acknowledged. [T1.226-1992]
  54. retrieval service In interactive telecommunications, a service allowing access to and retrieval of stored information, e.g., the information within a database.
  55. Retrograde Orbit An orbit having inclination of 0 to 90 degrees (See Prograde Orbit).
  56. return loss The ratio, at the junction of a transmission line and a terminating impedance or other discontinuity, of the amplitude of the reflected wave to the…
  57. Return Supervision Signaling which responds to an incoming request for service or change of status.
  58. return-to-zero (RZ) A digital code having two information states, e.g., "0" and "1" or "mark" and "yyspace", in which code the signal returns to a rest state during a portion…
  59. reverse-battery signaling Loop signaling in which battery and ground are reversed on the tip and ring of the loop to give an "off-hook" signal when the call receiver answers.
  60. reversible public key cryptography An asymmetric cryptographic algorithm whereby (a) messages encrypted using the public key can only be decrypted by using the private key, and (b) data…
  61. revertive pulsing In telephone networks, a means of controlling distant switching selections by pulsing.
  62. RF Abbreviation for replicative form.
  63. rf bandwidth See occupied bandwidth, necessary bandwidth.
  64. rf power margin The amount of transmitter power above that which is computed by the link designer as the minimum required to meet specified link performance.
  65. rf tight Offering a high degree of electromagnetic shielding effectiveness.
  66. RFC River Forecast Center. Centers that serve groups of Weather Service Forecast offices and Weather Forecast offices, in providing hydrologic guidance and is…
  67. RFI (1) Request for Issue. (2) Request for Information. (3) Radio Frequency Interference.
  68. RGB Red, Green, Blue (Video Engineering term).
  69. rhombic antenna A directional antenna that is composed of long-wire radiators that form the sides of a rhombus, the two halves of which are fed equally in opposite phase…
  70. RI Abbreviation for routing indicator.
  71. ribbon cable Any cable constructed as a ribbon with parallel elements. 2. A fiber optic cable in which the optical fibers are held in grooves and laminated within a…
  72. right-hand (or clockwise) polarized wave An elliptically or circularly polarized wave, in which the electric field vector, observed in any fixed plane, normal to the direction of propagation…
  73. right-hand rule Synonym Fleming's rule.
  74. ring In telephony, a signal of specific duration and character that indicates to a user (customer, subscriber) that a calling party is engaged in an access…
  75. ring latency In a ring network, such as a token ring network, the time required for a signal to propagate once around the ring.
  76. ring network See network topology.
  77. ring topology See network topology.
  78. ring transit time See round-trip delay time.
  79. ring trip Removal of an alerting signal in response to a loop closure. [T1.407-1997]
  80. ringaround 1. The improper routing of a call back through a switching center already engaged in attempting to complete the same call. 2.
  81. ringback signal In telephony, a signal, usually consisting of an audio tone interrupted at a slow rate, provided to a caller to indicate that the called-party instrument…
  82. ringback tone Synonym audible ringing tone.
  83. ringdown In telephony, a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp and cause the drop of a…
  84. ringdown circuit In telephony, a circuit in which manually generated signaling power is used to perform ringdown.
  85. ringdown signaling In telephony, the application of a signal to a line (a) to operate a line signal lamp or a supervisory signal lamp at a switchboard or (b) to ring a…
  86. ringer equivalency number (REN) A number determined in accordance with the Code of Federal Regulations, Title 47, part 68, which number represents the ringer loading effect on a line.
  87. ringing Oscillations that occur in the output of systems after a sudden change in the input. [T1.646-1995]
  88. ringing cycle In traditional telephony, a nominal period (usually approximately 6 seconds) composed of alternate (a) ringing signals (ringing current) and (b) a silent…
  89. ringing signal 1. The alternating current (ac) component of the alerting signal. [T1.401-1988] [T1.407-1990] 2.
  90. RIP The procedures used to unbundle email collections into individual emails during the e-discovery process while preserving authenticity and ownership.
  91. rip cord Of an optical cable, a parallel cord of strong yarn that is situated under the jacket(s) of the cable for the purpose of facilitating jacket removal…
  92. ripple voltage In a dc voltage, the alternating component that is residually retained from rectification of ac power, or from generation and commutation. 2.
  93. RISC Reduced Instruction Set Computers.
  94. rise time In the approximation of a step function, the time required for a signal to change from a specified low value to a specified high value.
  95. Risk The possibility of loss; the uncertainty of future returns.
  96. risk acceptance A managerial decision to accept a certain degree of risk, usually for technical or cost reasons. [2382-pt.8]
  97. risk analysis A process consisting of three components: risk assessment, risk management and risk communication performed to understand the nature of unwanted, negative…
  98. risk assessment a scientifically based process consisting of the following steps: i) hazard identification; ii) hazard characterization; iii) exposure assessment; and iv)…
  99. risk index [The] difference between the minimum clearance or authorization of information system (IS) users and the maximum sensitivity (e.g.
  100. risk management The process, distinct from risk assessment, of weighing policy alternatives, in consultation with all interested parties, considering risk assessment and…

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