Telecommunications — page 53 of 85

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

Subtopics

Telecommunications terms

  1. one-time pad 1. [ A] manual one-time cryptosystem produced in pad form. [INFOSEC-99] 2. The one time pad is the ONLY encryption scheme that can be proven to be…
  2. one-way communication Communication in which information is always transferred in only one preassigned direction.
  3. one-way encryption 1. A method of encryption used where a requirement exists to prevent the decryption of the cipher text, given full information about the algorithm [CESG].
  4. one-way function 1. A transfer function f which is relatively easy to compute, but for which, for a general value, y , within the selected range, it is computationally…
  5. one-way operation Synonym simplex operation.
  6. one-way regulator A component which allows the transfer of information from one system to another, whilst providing a high level of confidence that information flow in the…
  7. one-way reversible operation Synonym half-duplex operation.
  8. one-way trunk A trunk between two switching centers, over which traffic may be originated from one preassigned location only.
  9. one-way-only channel A channel capable of transmission in only one direction, which cannot be reversed. Synonym unidirectional channel.
  10. online computer system A computer system that is a part of, or is embedded in, a larger entity, such as a communications system, and that interacts in real or near-real time…
  11. online shopping A process in which images or listings of goods and services are viewed remotely via electronic means, e.g.
  12. online software upgrade In computer networking, a software modification or installation performed remotely from an originating site (e.g.
  13. opaque data objects A mechanism by which a program can manipulate data structures of any format, without knowing what that format might be [POSIX.6].
  14. open circuit In communications, a circuit available for use. 2. In electrical engineering, a circuit that contains an essentially infinite impedance.
  15. Open Circuit Test Line The term "Open Circuit Test Line" denotes an arrangement in an end office which provides an ac open circuit termination of a trunk or line by means of an…
  16. open dual bus A dual bus in which the head-of-bus functions for both buses are at different locations.
  17. open network architecture (ONA) In the context of the FCC's Computer Inquiry III, the overall design of a communication carrier's basic network facilities and services to permit all…
  18. open specifications Public specifications that are maintained by an open, public consensus process to accommodate new technologies over time and that are consistent with…
  19. open storage Storage of classified information within an accredited facility, but not in General Services Administration approved secure containers, while the facility…
  20. open switching interval (OSI) An interval when the dc voltage applied between the tip and ring conductors of a line is removed, hence temporarily suspending line supervision and…
  21. open system 1. A system with characteristics that comply with specified, publicly maintained, readily available standards and that therefore can be connected to other…
  22. open system application program interface A combination of standards-based interfaces specifying a complete interface between an application program and the underlying application platform [POSIX.
  23. open system environment (OSE) The comprehensive set of interfaces, services, and supporting formats, plus user aspects for interoperability or portability of applications, data, or…
  24. open systems architecture The layered hierarchical structure, configuration, or model of a communications or distributed data processing system that (a) enables system description…
  25. Open Systems Interconnection (OSI) Pertaining to the logical structure for communications networks standardized by the International Organization for Standardization (ISO).
  26. Open Systems Interconnection (OSI)--Architecture Communications system architecture that adheres to the set of ISO standards relating to open systems architecture.
  27. Open Systems Interconnection (OSI)--Protocol Specification The lowest level of abstraction within the OSI standards scheme. Note: Each OSI--Protocol Specification operates at a single layer.
  28. Open Systems Interconnection (OSI)--Service Definitions The next lower level of abstraction below that of the OSI--Reference Model. The OSI--Service Definitions for each layer define the layer's abstract…
  29. Open Systems Interconnection (OSI)--Systems Management In the Application Layer of the OSI--Reference Model (OSI--RM), the set of functions related to the management and status of various resources identified…
  30. Open Systems Interconnection--Reference Model (OSI--RM) An abstract description of the digital communications between application processes running in distinct systems.
  31. open video systems An alternative method to provide cable-like video service to subscribers.
  32. open waveguide An all-dielectric waveguide in which electromagnetic waves are guided by a refractive index gradient so that the waves are confined to the guide by…
  33. open wire Conductors that are separately supported with insulators on poles or towers above the surface of the Earth.
  34. open-security environment In INFOSEC, an environment in which protection of data and resources from accidental or malicious acts is achieved through normal operational procedures.
  35. operand An operand is an argument of an operator. Expressions involve combinations of operators and operands.
  36. operating procedure A set of rules defining the correct use of a Target of Evaluation [ITSEC].
  37. operating system Software which directs the overall activity of a computer (e.g. MS-DOS , Windows , Linux , etcetera).
  38. operating system platform Synonym platform.
  39. operating time The time interval between the instant of occurrence of a specified input condition to a system and the instant of completion of a specified operation. 2.
  40. Operation The manner in which a window unit opens, closes, locks, or functions; e.g., casement, double-hung, etc.
  41. operational data security Protection of data from either accidental or unauthorized intentional modification, destruction, or disclosure during input, processing, storage…
  42. operational documentation the information produced by the developer of a Target of Evaluation to specify and explain how customers should use it [ITSEC].
  43. operational environment 1. The set of procedures, methods, tools and standards used during system operation [CESG]. See also: Development Environment. 2.
  44. operational key Key intended for use over-the-air for protection of operational information or for the production or secure electrical transmission of key streams.
  45. operational load The total power requirements for communications facilities.
  46. operational service period A period during which a telecommunications service remains in an operational state.
  47. operational service state During any performance measurement period, a telecommunications service condition that existed when the calculated values of specified performance…
  48. operations The term denoting the general classifications of services rendered to the public for which separate tariffs are filed, namely exchange, state toll and…
  49. operations code Code composed largely of words and phrases suitable for general communications use. [INFOSEC-99]
  50. operations security [The] process denying to potential adversaries information about capabilities and/or intentions by identifying, controlling and protecting generally…
  51. operations security (OPSEC) [The] Process denying information to potential adversaries about capabilities and/or intentions by identifying, controlling, and protecting unclassified…
  52. operations system A system that performs operations system functions (OSFs), that is, supports the processing of information related to operations, administration…
  53. operator service access point (OSAP) The functional entity that provides access to an operator service from an exchange in the network.
  54. operator service provider The company accepting the billing information, initiating the validation process, and recording the details of the call. [T1.230-1992]
  55. Operator Service Provider (OSP) A common carrier that provides services from public phones, including payphones and those in hotels/motels.
  56. operator services A set of services including toll and assistance, listing services and intercept, associated with the originating connection network capability. [After T1.
  57. operator system A stored program electronic system associated with one or more toll switching systems which provides centralized traffic service position functions for…
  58. operator trunks A general term, ordinarily applied to trunks between manually operated switchboard positions and local dial central offices in the same wire center.
  59. OPSEC Operations Security.
  60. optical amplifier See fiber amplifier, optical repeater.
  61. optical attenuator In optical communications, a device used to reduce the power level of an optical signal.
  62. optical axis Of a refractive or reflective optical element, the straight line that is coincident with the axis of symmetry of the surfaces.
  63. optical beamsplitter See beamsplitter.
  64. optical cable See fiber optic cable.
  65. optical cable assembly See cable assembly.
  66. optical carrier level 1 (OC-1) The optical signal that results from an optical conversion of an synchronous transport signal 1 (STS-1 signal).
  67. optical cavity A region bounded by two or more mirrors that are aligned to provide multiple reflections of lightwaves.
  68. optical character reader (OCR) A device used for optical character recognition.
  69. Optical Character Recognition (OCR) (OCR) The automatic recognition and interpretation of text.
  70. optical conductor Deprecated synonym for optical fiber.
  71. optical connector A demountable device for attaching a cabled or uncabled optical fiber to another, or to an active device such as a transmitter.
  72. optical coupler See directional coupler, star coupler, T-coupler.
  73. optical density (OD) For a given wavelength, an expression of the transmittance of an optical element.
  74. optical detector A transducer that generates an output signal when irradiated with optical energy.
  75. optical disk A digital data storage technology that uses optical media to store information.
  76. optical dispersion See dispersion.
  77. optical fiber A filament of transparent dielectric material, usually glass or plastic, and usually circular in cross section, that guides light.
  78. optical fiber cable See fiber optic cable.
  79. optical fiber coating See primary coating.
  80. optical fiber jacket See sheath.
  81. optical fiber link See fiber optic link.
  82. optical fiber nuclear hardening Design allowances made to prevent or ameliorate the effects of gamma or high-energy neutron radiation or bombardment, that causes some optical fibers to…
  83. optical fiber transfer function See transfer function.
  84. optical fiber waveguide See optical fiber.
  85. optical fiber, conductive See OFC.
  86. optical fiber, conductive, plenum See OFCP.
  87. optical fiber, conductive, riser See OFCR.
  88. optical fiber, nonconductive See OFN.
  89. optical fiber, nonconductive, plenum See OFNP.
  90. optical fiber, nonconductive, riser See OFNR.
  91. optical filter In the optical regime, an element that selectively transmits or blocks a range of wavelengths, polarizations, etc., or selectively displaces a beam, e.g.
  92. optical heterodyning See optical mixing.
  93. optical interconnection In an integrated circuit or electronic module, the use of opto-electronic devices to make or facilitate connections, in lieu of a direct connection…
  94. optical interface In a fiber optic communications link, a point at which an optical signal is passed from one equipment or medium to another without conversion to an…
  95. optical isolator A device that uses a short optical transmission path to accomplish electrical isolation between elements of a circuit.
  96. optical junction Any physical interface in a fiber optic system. Note: Source to fiber, fiber to fiber, fiber to detector, beam to prism (or lens), fiber to lens, lens to…
  97. optical line code Sequences of optical pulses suitably structured to permit information transfer over an optical link.
  98. optical line pair 1. In optical measurements or specifications, a pair of usually straight contiguous stripes of equal width and having a defined degree of contrast, and…
  99. optical link An optical transmission channel, including any repeaters or regenerative repeaters, designed to connect two electronic or opto-electronic communications…
  100. optical mixing Optical beating, i.e., the mixing, i.e., heterodyning, of two lightwaves (incoming signal and local oscillator) in a nonlinear device to produce a beat…

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