Telecommunications terms starting with L

291 terms

101. line adapter circuit See four-wire terminating set.
102. line alarm indication signal (AIS) code The code generated by a regenerator upon loss of input signal or loss of frame.
103. line balance The degree of electrical similarity of the two conductors of a transmission line.
104. line buildout (LBO) Synonym building out.
105. line code A code chosen for use within a communications system for transmission purposes.
106. line conditioning [The] elimination of unintentional signals or noise induced or conducted on a telecommunications or information system signal, power, control, indicator…
107. line conduction Unintentional signals or noise induced or conducted on a telecommunications or information system signal, power, control, indicator, or other external…
108. line driver An amplifier used to enhance the transmission reliability of a usually digital intrafacility metallic transmission line, over extended distances, by…
109. line filter balance A network designed to maintain phantom group balance when one side of the group is equipped with a carrier system.
110. line hit See yyhit.
111. line load control A network-provided service feature that allows selective denial of call origination to certain lines when excessive demands for service are required of a…
112. line loop See loop.
113. line loopback A signal used to command the far-end receiver to loopback the received line signal. [T1.107-1988] Synonym [loosely] line loopback signal.
114. line loopback signal See line loopback.
115. line noise In a telecommunications link or line facility, interference, from any source, that degrades performance.
116. line side The portion of a device that is connected to external, i.e., outside plant, facilities such as trunks, local loops, and channels.
117. Line Source An array of pollutant sources along a defined path that can be treated in dispersion models as an aggregate uniform release of pollutants along a line.
118. line spectrum In optics, an emission or absorption spectrum consisting of one or more narrow spectral lines, as opposed to a continuous spectrum.
119. line speed See modulation rate.
120. line terminating equipment (LTE) Network elements that originate and/or terminate line signals. LTEs can originate, access, modify, or terminate the transport overhead, or can perform any…
121. line traffic coordinator (LTC) In a DDN switching center, the processor that controls traffic on a line.
122. line unit network termination (LUNT) The customer side of any digital subscriber line (DSL) that does not terminate on the customer installation (CI). [T1.216-1998]
123. line verification See busy verification.
124. line-of-sight (LOS) propagation Of an electromagnetic wave, propagation in which the direct ray from the transmitter to the receiver is unobstructed, i.e.
125. line-rate conversion A translation of standardized, existing video systems (using 525, 625, and 1125 total lines per frame) to proposed systems.
126. line-route map A map or overlay for signal communications operations that shows the actual routes and types of construction of wire circuits in the field.
127. line-to-line correlation In facsimile, the correlation of object information from scanning line to scanning line.
128. linear analog control Synonym linear analog synchronization.
129. linear analog synchronization Synchronization in which the functional relationships used to obtain synchronization are of simple proportionality. Synonym linear analog control.
130. linear combiner A diversity combiner in which the combining consists of simple addition of two or more signals.
131. linear device A device for which the output is, within a given dynamic range, linearly proportional to the input.
132. linear key In video technology and image processing, a process for the selective overlay of one video image upon another, as through chroma key.
133. linear network See network topology.
134. linear optimization Synonym linear programming.
135. linear polarization Of an electromagnetic wave, confinement of the E-field vector or H-field vector to a given plane.
136. linear predictive coding (LPC) A method of digitally encoding analog signals, which method uses a single-level or multilevel sampling system in which the value of the signal at each…
137. linear programming (LP) In operations research, a procedure for locating the maximum or minimum of a linear function of variables that are subject to linear constraints.
138. linear topology See network topology.
139. linearity The property of a system in which, if input signals X and Y result in system output S(X) and S(Y) respectively, the input signal aX + bY will result in…
140. linearly polarized (LP) mode A mode for which the field components in the direction of propagation are small compared to components perpendicular to that direction.
141. linewidth See spectral width.
142. link See Hyperlink.
143. link diversity The process of provisioning signaling links with physically separate transmission routes between signaling points to mitigate impact of facility failures.
144. Link Encryption Link encryption encrypts all of the data along a communications path (e.g., a satellite link, telephone circuit, or T1 line).
145. Link Layer Deprecated term for Data Link Layer. See Open Systems Interconnection--Reference Model.
146. link level In the hierarchical structure of a primary or secondary station, the conceptual level of control or data processing logic that controls the data link.
147. link orderwire A voice or data communications circuit that (a) serves as a transmission link between adjacent communications facilities that are interconnected by a…
148. link protocol A set of rules relating to data communications over a data link. Note: Link protocols define data link parameters, such as transmission code, transmission…
149. link quality analysis (LQA) In adaptive high-frequency (HF) radio, the overall process by which measurements of signal quality are made, assessed, and analyzed.
150. link set A set of signaling links directly connecting two signaling points.[T1.226-1992]
151. link state control The control that coordinates functions of the signaling link, including signal unit delimitation, signal unit alignment, error detection, error…
152. link status signal unit A signal unit that contains status information about the signaling link in which it is transmitted. [T1.110-1987]
153. link-by-link encipherment The individual application of encipherment to data on each link of a communications system [7498-2].
154. linkage The frequency of coinheritance of a pair of genes and/or genetic markers, which provides a measure of their physical proximity to one another on a…
155. linked registration A type of AllCall registration feature, the use of which combines the registrations for incoming and outgoing calls for the current terminal address in a…
156. linking protection (LP) In adaptive high-frequency (HF) radio, protection intended to prevent the establishment of unauthorized links or the unauthorized manipulation of…
157. linux A freeware version of the Unix™ operating system.
158. lip synchronization The synchronization of audio and corresponding video signals so that there is no noticeable lack of simultaneity between them.
159. liquid crystal display (LCD) A display device that creates characters by means of the action of electrical signals on a matrix of liquid cells that become opaque when energized.
160. list address In e-mail, an address used by mailing list subscribers to send e-mail to be distributed to each member of a discussion list, forum, interest group…
161. list processor Software used to manage and administer a discussion-group list, an interest group list, or a mailing list. [After Bahorsky]
162. List Server A list server (mailing list server) is a program, or a feature in a program, that handles subscription requests for a mailing list and distributes new…
163. live link A link, on a World Wide Web file, that connects to another layer of information. [After Bahorsky]
164. livescript See scripting language.
165. LLC Abbreviation for logical link control. See logical link control sublayer.
166. LNA Low Noise Amplifier.
167. Load Commissions charged on the purchase or sale of mutual fund units.
168. load capacity In pulse-code modulation (PCM), the level of a sinusoidal signal that has positive and negative peaks that coincide with the positive and negative virtual…
169. Load factor The ratio of average energy demand (load) to maximum demand (peak load) during a specific period.
170. load sharing A process used to route signaling traffic over two or more signaling routes for purposes of traffic equalization or security. [T1.226-1992]
171. loader A routine that reads data into main storage.
172. Loading Weight at a given tire position on a car due to aerodynamics, vehicle weight and lateral G-forces in a turn.
173. loading characteristic In multichannel telephone systems, a plot, for the busy hour, of the equivalent mean power and the peak power as a function of the number of voice…
174. loading coil A coil that does not provide coupling to any other circuit, but is inserted in a circuit to increase its inductance.
175. lobe A portion of an organ, such as the liver, lung, breast, thyroid, or brain.
176. lobe attaching unit In a ring network, a functional unit used to connect and disconnect data stations to and from the ring without disrupting network operations.
177. local access and transport area (LATA) Under the terms of the Modification of Final Judgment (MFJ), a geographical area within which a divested Bell Operating Company (BOC) is permitted to…
178. local adaption The process of modifying a product that has hard-coded biases of one culture to the hard-coded biases of another culture [POSIX.0].
179. Local Area Network (LAN) Computer data communications technology that connects computers at the same site.
180. local battery In telegraphy, the source of power that actuates the telegraphic station recording instruments, as distinguished from the source of power that furnishes…
181. local call Any call using a single switching facility. 2. Any call for which an additional charge, i.e., toll charge, is not made to the calling or called party.
182. local central office Synonym central office.
183. local channel The portion of a private line circuit which is included in the exchange transmission plant.
184. local clock A source of timing located in close proximity to an associated facility, such as a communications station, central office, or node.
185. local communication network (LCN) A communication network within a TMN (telecommunications management network) that supports data communication functions (DCFs) normally at [specified]…
186. local exchange Synonym central office.
187. local exchange carrier (LEC) A local telephone company, i.e., a communications common carrier that provides ordinary local voice-grade telecommunications service under regulation…
188. local exchange loop An interconnection between customer premises equipment and telephone central office.
189. local line See loop.
190. local loop Synonym loop.
191. local measured service See measured-rate service.
192. local node A node which interfaces directly with customer equipment. [T1.101-1999]
193. local office Synonym central office. 2. A central office serving primarily as a place of termination for subscriber lines and for providing telephone service to the…
194. local orderwire A communications circuit between a technical control facility and selected terminal or repeater locations within the communications complex.
195. local reference A local number, unambiguously identifying an SCCP (signaling connection control part) connection within one SCCP entity. [T1.110-1987]
196. local security environment That part of the security domain of a system which is under the control of the System Manager [CESG].
197. local side The portion of a device that is connected to internal facilities, such as switches, patch panels, test bays and supervisory equipment.
198. Locale Details which are dependent upon conventions and customs adopted by a particular country or culture.
199. Localization (LO-kal-ih-ZAY-shun) The process of determining or marking the location or site of a lesion or disease.
200. Location Routing Number (LRN): The ten-digit (NPA-NXX-XXXX) number assigned to a switch/POI used for routing in a permanent local number portability environment.