- Industry: 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.
An optical source that obeys Lambert's cosine law, i.e., that has an intensity directly proportional to the cosine of the angle from which it is viewed. Note: Conventional (surface-emitting) LEDs are approximately Lambertian. They have a large beam divergence. This results in a radiation pattern that resembles a sphere. Thus, most of their total optical output is not coupled into communication fibers.
Industry:Telecommunications
An optical splice or connector designed to mate two multifiber cables, providing simultaneous optical alignment of all individual optical fibers.
Industry:Telecommunications
An optical system in which the optical axis of the aperture is not coincident with the mechanical center of the aperture. Note: The principal applications of off-axis optical systems are to avoid obstruction of the primary aperture by secondary optical elements, instrument packages, or sensors, and to provide ready access to instrument packages or sensors at the focus. The engineering tradeoff of an off-axis optical system is an increase in image aberrations.
Industry:Telecommunications
An optical transmission channel, including any repeaters or regenerative repeaters, designed to connect two electronic or opto-electronic communications terminals. Note: An optical link is sometimes held to include the terminal optical transmitters and receivers, especially in the case of a communications link utilizing separate electronic terminals originally designed for metallic transmission, and retrofitted for optical transmission.
Industry:Telecommunications
An optically bistable device used for photonic switching. Note: A self-electro-optic device consists of multiple elements, biased by an external voltage which creates an external field that shifts the wavelength of the onset of absorption, thus varying the intensity of the transmitted light.
Industry:Telecommunications
An optional unbundled feature, generally associated with the basic serving arrangement (BSA,) that an enhanced-service provider (ESP) may require or find useful in configuring an enhanced service. 2. A fundamental (basic) communication network service; an optional network capability associated with a BSA. Note: BSEs constitute optional capabilities to which the customer may subscribe or decline to subscribe.
Industry:Telecommunications
An optional user facility in the virtual call service of CCITT X. 25 protocol (now, ITU-T X. 25 protocol) that allows the inclusion of user data in the call request/connected and clear indication packets. Note: Fast select is an essential feature of the CCITT X. 25 (1984) protocol.
Industry:Telecommunications
An opto-electronic instrument used to characterize an optical fiber. Note 1: An OTDR injects a series of optical pulses into the fiber under test. It also extracts, from the same end of the fiber, light that is scattered back and reflected back. The intensity of the return pulses is measured and integrated as a function of time, and is plotted as a function of fiber length. Note 2: An OTDR may be used for estimating the fiber's length and overall attenuation, including splice and mated-connector losses. It may also be used to locate faults, such as breaks.
Industry:Telecommunications
An orbit for which the angle of inclination is 90o. Note: A satellite in polar orbit will pass over both the north and south geographic poles once per orbit.
Industry:Telecommunications
An orbital path configuration, between altitudes of 8,000 and 20,000 km, used by communication satellites that provide communications capabilities for such services as cellular telephone communications and GPS (global positioning system) signals. Classification Orbital Altitude (km above the Earth) LEO 500-2,000 MEO 8,000-20,000 Geostationary orbit 35,786
Industry:Telecommunications
