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	Glossary of Terms-A Guide to Product Descriptions A Attenutation Bandwidth Cable Decibel (dB) E Four-Wire D L LASER LE Multimode Nanometer (nm) One-Way Optical Loss PCM Single-Mode TDM Transceiver Two-Way V WDM 1 2 2E 2L
	A Model number suffix indicating audio-based products. Attenuation The maximum amount of signal loss a system will tolerate and still function satisfactorily is "maximum attenuation". The higher this number (expressed in decibels), the further the system will function. See Optical Loss. Bandwidth The range of frequencies within which a waveguide or terminal device can transmit data. Cable Fibre-optic cable can be comprised of one strand of fibre (sometimes called simplex) of two strands (called duplex). Standard fibre-optic cable is available up to 48 strands of fibre. Decibel (dB) A unit of measurement indicating relative power on a logarithmic scale. E Model number suffix indicating one-way transmission at 1550 nm for multi-mode or single-mode products. Four-Wire Two-way communication circuit using two paths, where signals are transmitted one direction to one path, and in the opposite direction to the other. D Model number suffix indicating data-based products or products that may combine data with audio, data with video, or data with audio and video. L Model number suffix indicating one-way transmission over one fibre at 1300 nm for multimode or 1310 nm for single-mode products. LASER Acronym for Light Amplification by Simulated Emission of Radiation. A light source often found in single-mode fibre links. LE Model number suffix indicating one-way transmission over two fibres at 1300/1550 nm for multimode of 1310/1550 nm for single-mode products. Multimode Optical fibre with a core large enough to propagate more than one mode of light (50µ or 62.5µ are typical). Nanometer (nm) A unit of measurement equal to one billionth of a meter, 10-9 meters. One-Way Transmission in one direction, one or multiple signs over one fibre. Optical Loss The amount of a signal's power, expressed in decibels, that is lost in connectors, splices, fibre defects, or over distance. PCM Pulse Code Modulation: A technique wherein an analog signal is converted to a digital signal by sampling the signal's amplitude and expressing the different amplitudes as a binary number. Single-Mode Optical fibre with the smallest core size (8.3µ is typical) where a single light ray, or mode, is transmitted along the core of the fibre. TDM Time Division Multiplexing: Digital multiplexing by taking one pulse at a time from separate signals and combining them in a single synchronized bit stream. Transceiver A device that embodies the characteristics of a receiver and a transmitter within one unit. Two-Way Transmission in two directions, either one at a time (half duplex) or both directions simultaneously (full duplex). V Model number suffix indicating video-based products. WDM Wave Division Multiplexing: Transmitting signals at different wavelengths through the same fibre. A method of multiplexing two or more optical channels separated by wavelength. 1 Model number suffix indicating two-way transmission over ONE fibre using WDM at 850/1300 nm for multimode, 1310/1550 nm for single mode. 2 Model number suffix indicating two-way transmission over TWO fibres at 850 nm for multimode or 1310 nm for single mode. 2E Model number suffix indicating two-way transmission over TWO single-mode fibres at 1550 nm. 2L Model number suffix indicating two-way transmission over TWO multimode fibres at 1300 nm.
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