Telecommunications terms starting with F

396 terms

  1. fiber pigtail See pigtail.
  2. fidelity The degree to which a system, or a portion of a system, accurately reproduces, at its output, the essential characteristics of the signal impressed upon…
  3. FidoNet A network designed for e-mail distribution through individual bulletin board systems rather than through Internet servers.
  4. field Field A region of space at each point of which a given physical or mathematical quantity has some definite value.
  5. field intensity The irradiance of an electromagnetic wave under specified conditions. Note: Field intensity is usually expressed in watts per square meter.
  6. field strength 1. The magnitude of an electric, magnetic, or electromagnetic field at a given point.
  7. field tag Synonym flag.
  8. field wire A flexible insulated wire used in field telephone and telegraph systems. Note 1: WD-1 and WF-16 are types of field wire.
  9. field-disturbance sensor A restricted radiation device which establishes a radio frequency field in its vicinity and detects changes in that field resulting from the movement of…
  10. FIFO First In, First Out. See also "LIFO". Also, a nickname for a "named pipe".
  11. file To place a paper in the official custody of the clerk of court/court administrator to enter into the files or records of a case.
  12. file ACL class The property of a file indicating access permissions for a process related to the process' user or group identification.
  13. file archive Synonym FTP archive.
  14. file name extension A suffix that is preceded by a decimal (".") and that is appended to a computer file name. Note: Common filename extensions with their meanings are: .
  15. file other class The property of a file indicating access permissions for a process related to the process' user and group identification.
  16. file privilege attribute A per-file privilege value that specifies global behavior for all privileges defined in the implementation [POSIX.6].
  17. file privilege flag A per-privilege attribute of a file that is used during exec() processing in computing the privileges of any process executing that file [POSIX.6].
  18. file privilege state A state variable that identifies a value for all defined file privilege flags for all privileges defined in an implementation and a value for all file…
  19. file protection The execution of appropriate administrative, technical, or physical means to guard against the unauthorized access to, modification of, or deletion of a…
  20. file security [A] means by which access to computer files is limited to authorized users only. [INFOSEC-99]
  21. File Server When several or many computers are networked together in a LAN situation, one computer may be utilized as a storage location for files for the group.
  22. file site Synonym FTP archive.
  23. file transfer Moving named files from one computer or network to another
  24. File Transfer Protocol (FTP) A method of data transfer that can take place between Frame Relay Networks, and Workstations.
  25. file transfer, access, and management (FTAM) An application's service and protocol based on the concept of virtual file store.
  26. file-oriented applications Applications concerned with the storage, manipulation, and exchange of information between application processes in the form of files. [T1.210-1993]
  27. Fill Man-made deposits of soil and rock and/or waste material.
  28. fill bit See bit stuffing.
  29. fill device [A] COMSEC item used to transfer or store key in electronic form or to insert key into a crypto-equipment. [INFOSEC-99]
  30. fill-in area The area where the coverage contour of an FM translator or booster station is within the protected contour of the associated primary station (i.e.
  31. fill-in signal unit (FISU) A signal unit that is transmitted when there are no message signal units or link status signal units to be transmitted.
  32. filled cable A cable that has a nonhygroscopic material, usually a gel, inside the jacket or sheath.
  33. FILO Abbreviation for first-in last-out.
  34. filter A criterion you specify to limit the results when you list or describe your Amazon EC2 resources.
  35. filtered symmetric differential phase-shift keying (FSDPSK) A method of encoding information for digital transmission in which (a) a binary 0 is encoded as a +90° change in the carrier phase and a binary 1 is…
  36. final trunk group A last-choice trunk group that receives overflow traffic, may receive first-route traffic and for which there is no alternate route.
  37. finger A computer-operating-system command for accessing limited network-user-account information.
  38. finished call In an information transaction, a call in which the call originator or call receiver terminates the communication and goes on hook, i.e., hangs up. 2.
  39. FIP Federal Information Processing.
  40. FIP equipment In the Federal government, any equipment or interconnected system or subsystems of equipment (as defined in 41CFR) used in the automatic acquisition…
  41. FIP system In the Federal government, any organized combination of FIP equipment, software, services, support services, or related supplies.
  42. FIREFLY [A] key management protocol based on public key cryptography. [INFOSEC-99]
  43. Firewall A set of related programs that protect the resources of a private network from users from other networks.
  44. Firmware The programs and data components of a cryptographic module that are stored in hardware within the cryptographic boundary and cannot be dynamically written…
  45. first window Of silica-based optical fibers, the transmission window at approximately 830 to 850 nm. [FAA]
  46. first-in first-out (FIFO) A queuing discipline in which entities in a queue leave the queue in the same order in which they arrive.
  47. first-in last-out (FILO) A queuing discipline in which entities in a queue leave the queue in the reverse order from that in which they arrived.
  48. first-route traffic Traffic that has not been route-advanced at any switching system. [T1.Rpt 11-1991]
  49. FISINT Acronym for foreign instrumentation signals intelligence.
  50. five-hundred (500) service A telephone service that allows individuals to receive, via a single number, telephone calls in various locations (e.g.
  51. fixed access In personal communications service (PCS), terminal access to a network in which there is a set relationship between a terminal and the access interface.
  52. fixed attenuator See pad.
  53. fixed loop A service feature that permits an attendant on an assisted call to retain connection through the attendant position for the duration of the call.
  54. fixed microwave auxiliary station A fixed station used in connection with (a) the alignment of microwave transmitting and receiving antenna systems and equipment, (b) coordination of…
  55. fixed service (FX) A radiocommunication service between specified fixed points. [NTIA] [RR] [47CFR]
  56. fixed station A station in the fixed service. [NTIA] [RR] [47CFR] 2. The term "fixed station" in the fixed public or fixed public press service includes all apparatus…
  57. fixed storage Synonym read-only storage.
  58. fixed-reference modulation Modulation in which the significant condition for any signal element is based on a fixed reference.
  59. fixed-satellite service A radiocommunication service between Earth stations at given positions when one or more satellites are used; the given position may be a specified fixed…
  60. fixed-tolerance-band compaction Data compaction accomplished by storing or transmitting data only when the data fall outside prescribed limits.
  61. flag See affinity tag.
  62. flag sequence In data transmission or processing, a sequence of bits used to delimit, i.e. mark, the beginning and end of a frame.
  63. Flame An insulting criticism or remark meant to incite anger.
  64. Flash A sudden, brief illumination of a conductive channel associated with lightning, which may contain multiple strokes with their associated stepped leaders…
  65. flash card In computer-based equipment (such as MP3 players, digital cameras, and palm-held computers), a type of memory storage device approximately the size of a…
  66. flash feature A supplementary calling feature provided by the near-end customer interface (CI) that is activated or controlled through the use of one or more flash…
  67. flash memory card Synonym flash card.
  68. FLASH message A category of precedence reserved for initial enemy contact messages or operational combat messages of extreme urgency. Brevity is mandatory. [JP 1-02]
  69. flash signal A loop-open signal of 300 to 1000 ms at the network interface (NI) that is generated by the network, typically under the control of the far-end customer…
  70. flat fading Fading in which all frequency components of a received radio signal vary in the same proportion simultaneously.
  71. flat rate service Telephone service in which a single payment permits an unlimited number of local calls to be made without further charge for a specified period of time.
  72. flat weighting In a noise-measuring set, a noise weighting based on an amplitude-frequency characteristic that is flat over a frequency range that must be stated.
  73. flaw 1. In computer security, an error of commission, an omission, or an oversight that allows protection mechanisms to be bypassed or disabled. 2.
  74. flaw hypothesis methodology 1. System analysis and penetration technique in which the specification and documentation for an information system (IS) are analyzed to produce a list of…
  75. Fleming's rule A rule stating that if the thumb of the right hand points in the direction of an electric current, then the curled fingers point in the direction of the…
  76. flexible disk Synonym diskette.
  77. flicker In video, any of several visual artifacts similar to (i.e., manifested as) a stroboscopic effect (jerkiness), sometimes caused by or related to vertical…
  78. flip-flop A device that may assume either one of two reversible, stable states. Note 1: The flip-flop is used as a basic control element in computer and…
  79. float operation Operation of a dc system with the battery, rectifier, and load all connected in parallel.
  80. Floating The process of an applicant deciding against locking-in an interest rate at the time of application and instead electing to float with the market until a…
  81. floating head A magnetic head floating on a layer of air away from the recording surface. Synonyms air-floating head, flying head. [ANSDIT]
  82. floating-point coding compaction Data compaction accomplished by using coefficients, a base, and exponents to specify the scale, range, or magnitude of numbers.
  83. flood projection In facsimile, the optical method of scanning in which the object is floodlighted and the scanning spot is defined by a masked portion of the illuminated…
  84. flood search routing In a telephone network, nondeterministic routing in which a dialed number received at a switch is transmitted to all switches, i.e.
  85. flooding Insertion of a large volume of data resulting in denial of service. [INFOSEC-99] Synonyms [in e-mail and forum postings] mail bombing, spamming; [in radio…
  86. flooding compound A substance surrounding the buffer tubes of a fiber-optic cable, to prevent water intrusion into the interstices in the event of a breach of the jacket.
  87. floppy disk A circular sheet of polyester coated with magnetic oxide and housed in a thin, square plastic jacket that is used as a removable data storage medium See…
  88. flops Acronym for floating-point operations per second. Note: For example, 15 Mflops equals 15 million floating-point arithmetic operations per second.
  89. flow control See transmit flow control.
  90. flow control procedure A procedure for controlling the rate of transfer of data among elements of a network, e.g.
  91. flow diagram Synonym flowchart.
  92. flowchart A graphical representation using symbols to document the flow of information, the decision-making process, and/or the sequence of operations that are to…
  93. flowline On a flowchart, a line that (a) has an indicated direction, (b) represents a connection between other symbols, and (c) indicates the sequence of…
  94. flutter Rapid variation of signal parameters, such as amplitude, phase, and frequency. Note: Examples of flutter are (a) rapid variations in received signal…
  95. Flux The amount of energy passing through a unit area (for example, 1m2) per time. On this website, we will be discussing the flux of light energy due to…
  96. flying head Synonym floating head.
  97. Flywheel Effect The damping of interior temperature fluctuations by massive construction.
  98. flywheeling Synonym flywheel effect.
  99. FM Full Mana
  100. FM blanketing That form of interference to the reception of other broadcast stations, which is caused by the presence of an FM broadcast signal of 115 dB (562 mV/m) or…