- 産業: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
A desk-mounted patch panel that provides the capability for controlling (a) sixteen 50-kb/s wideband or sixteen 2400-b/s narrowband user lines and (b) 5 narrowband trunks to DSN or other narrowband facilities.
Industry:Telecommunications
A destructive technique for determining certain optical fiber transmission characteristics, such as attenuation and bandwidth, by (a) performing the desired measurements on a long length of the fiber under test, (b) cutting the fiber under test at a point near the launching end, (c) repeating the measurements on the short length of fiber, and (d) subtracting the results obtained on the short length to determine the results for the residual long length. Note 1: The cut should not be made less than 1 meter from the launch end. However, cutting the fiber so close to the launch end (in a multimode fiber) will introduce errors in the measurements because at that point, modal equilibrium conditions have not been established. The errors so introduced will result in conservative results (i.e., higher transmission losses and lower bandwidths) than would be realized under equilibrium conditions. Note 2: Several characteristics may be determined using the same test fiber. Note 3: A variation of the cutback technique is the substitution method, in which measurements are made on a full length of fiber, and then on a short length of fiber having the same characteristics (core size, numerical aperture,) with the results from the short length being subtracted to give the results for the full length.
Industry:Telecommunications
A detailed statement of the technical aspects of a System Security Policy. Note: A System Electronic Information Security Policy provides the baseline for evaluation.
Industry:Telecommunications
A detection device that requires input energy from a source other than that which is being sensed. Note: An example of an active sensor is a photoconductive cell. 2. In surveillance, a detection device that emits energy capable of being detected by itself. Note: An example of an active sensor is a measuring instrument that generates a signal, transmits it to a target, and receives a reflected signal from the target. Information concerning the target is obtained by comparison of the received signal with the transmitted signal. 3. A measuring instrument in the Earth exploration-satellite service or in the space research service by means of which information is obtained by transmission and reception of radio waves.
Industry:Telecommunications
A deviation of frequency that generally results from irregular motion of the recording medium during the recording, duplication, or reproduction. Synonym flutter.
Industry:Telecommunications
A device capable of sending, receiving, or sending and receiving information over a communications channel.
Industry:Telecommunications
A device for combining several digital signals into an aggregate bit stream. Note: Digital multiplexing may be implemented by interleaving bits, in rotation, from several digital bit streams either with or without the addition of extra framing, control, or error detection bits.
Industry:Telecommunications
A device for connecting a channel to a highway, or a highway to a channel, at specified times.
Industry:Telecommunications
A device for connecting an unbalanced coaxial feeder to a balanced antenna.
Industry:Telecommunications
A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction.
Industry:Telecommunications
