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National electrical safety code (nesc)
| Fiber Optic Glossary |
This outside plant code contains basic safety provisions that cover supply, communication lines, equipment, and work practices of personnel employed by utilities
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Provisions, английский
- All sorts of food necessary for the subsistence of the army and navy. those shipped on board for the officers and crew of any vessel, including merchant-ships, are held in a policy of insurance, as part of her outfit.
- Резервы на покрытие возможных потерь
Communication, английский
- Связь; связной
- (кан.) решение экспертизы
- N коммуни- кация; процесс передачи информации; mis~ недопонимание, непонимание | attr. комму- никативный disorder, impairment, strategy cross-cultural (intercultural) ~ межкультурная коммуникация non-verbal ~ невербальная, неречевая комму- никация verbal ~ вербальная, речевая коммуникация
- Передача (распространение) информации процесс информирования населения.
- Corresponding by letter, hail, or signal. (see line of communication and boyaux.)
- Loosely, the transmission of structure across systems differentiated in time and in space, the process by which one mind affects another, interaction mediated by signals, symbols or messages. more formally and in cybernetics, communication is that construct an observer requires when he cannot take a dynamic system apart without loss (->ana~ysis), yet wants to distinguish, understand and say something about that system`s parts, variables or members, or alternatively, when he wants to explain the behavior of anyone of its parts yet cannot accomplish this adequately without reference to other parts of the system. communication ~s what integrates and distinguishes the participation of individuals in such wholes as groups, communities, societies. a more detailed analysis of communication processes reveals that they involve patterns that convey information, are subjected to numerous constraints and are describable in terms of transformations, including encoding, decoding, (->coding), transmission, and distortions due to the characteristics of a channel. historically, communication. was thought of as a binary relation between a sender and a receiver. modern conceptions of communication include complex networks possibly with feedback loops having the effect of memory, coordination, and coorientation and exhibiting dynamic properties not manifest in, and explainable by, reference to the properties of the.communicators involved (->constructivism). communications (plural
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Receiver sensitivity, английский
- This tells how much optical power the photodetector must receive to achieve a specified base band performance, such as a specified bit error rate or signal-to-noise ratio
- The minimum acceptable value of received power needed to achieve an acceptable ber or performance. it takes into account power penalties caused by use of a transmitter with worst-case values of extinction ratio, jitter, pulse rise times and fall times, optical return loss, receiver connector degradations, and measurement tolerances. the receiver sensitivity does not include power penalties associated with dispersion, or backreflections from the optical path; these effects are specified separately in the allocation of maximum optical path penalty. sensitivity usually takes into account worst-case operating and end-of-life (eol) conditions.
Chromatic dispersion (cd), английский
The variation in the velocity of light (group velocity) as a function of wavelength. it causes pulses of a modulated laser source to broaden when traveling within the fiber, up to a point where pulses overlap and bit error rate increases
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