| polyurethane (pu) | A thermoplastic material used in cable jackets derived from the polymerization of ethylene gas. basically, they are pure hydrocarbon resins with excellent dielectric properties |
| breakout cable | - A tight buffered cable with 900-micron coated fibers and aramid yarn surrounding each fiber. jumper cordage is a breakout structure. available in simplex and duplex variations for jumpers and ...
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| tight buffered cable | - A type of cable with internal 900-micron coated fibers, such as breakout and distribution styles. jacket materials vary but they are normally rated for indoor use to meet plenum, riser, and ls...
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| graded-index multimode fiber (gi-mmf) | A type of multimode fiber where the refractive index of the fiber core decreases radically towards the outside of the fiber. four types of gi-mmf have been specified in iec 60793-2: legacy om1 (62... |
| single-mode fiber (smf) | A type of optical fiber specified by the itu as g.652 (standard), g.652d (low water peak), g.657 (bendinsensitive), and g.655 (nonzero dispersion shifted). g.652 and g.652d fibers are also specifi... |
| optical time-domain reflectometer (otdr) | - A type of test equipment used to characterize a fiber via the transmission of an optical pulse. the resulting backscatter and reflections are measured as a function of time attenuation. the ot...
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| protrusion | According to the tia, the fiber optic is either polished even with the endface or has a positive or negative protrusion, i.e., “sticks out” or is recessed гекг. протрузия; выпирание; протрузия; |
| glossary of terms | Aerial cables cables that are designed to handle environmental concerns such as wind and ice loading, pollution, uv radiation, thermal cycling, stress, and aging in aerial placements |
| minembc | An abbreviation for minimum calculated effective modal bandwidth, is used to calculate the bandwidth of multimode fiber at gigabit data rates |
| fiber to the node (fttn) | An access network in which fiber is used for part, but not all, of the link from the olt to the end user. an optical-toelectrical conversion takes place at a node, which typically serves a neighbo... |
| alignment sleeve | An appliance for mating and holding two connector ferrules in alignment. also known as a c-clip |
| serving area (sa) | An area defined by 32 optical network terminals (onts) |
| deadzone | An area where an otdr cannot make measurements. it is limited by the laser’s pulse width, the reflection of the front panel connector, and detector circuitry. the shorter the pulse width, the shor... |
| diffraction grating | - An array of fine, parallel, equally-spaced reflecting or transmitting lines that mutually enhance the effects of diffraction to concentrate the diffracted light in a few directions determined ...
rejilla difractora .; difractora; дифракционная решетка; |
| telecommunications closet (tc) | An enclosed, secure space that houses telecom equipment, cable terminations, and cross-connects. recognized for backbone and horizontal cable facilities |
| electromagnetic pulse (emp) | An extremely strong but short-lived magnetic field that results from a solar flare or nuclear explosion. a highaltitude explosion could cause a damaging magnetic field up to 3000 miles away |
| air blown fiber (abf) | An installation technique developed by british telecom where micro ducts or “pipe cables” are installed, and then optical fibers or fiber bundles are blown into the cable with spans reaching 10,00... |
| international standards organization (iso) | An international body funded by the united nations, that provides consistent worldwide standards. u.s. membership is provided by ansi |
| erbium-doped fiber amplifier (edfa) | - An optical amplifier that uses active erbium-doped fiber and a pump source (laser) to boost or amplify the optical signal. used in dwdm, catv hfc, rf overlay and rfog systems. amplifies mostly...
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| plastic optical fiber (pof) | - An optical fiber type in which both the core and cladding are made from plastic. their transmission is typically much poorer than glass fiber, and their lowest losses are in the visible region...
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| large core fiber | An optical fiber with a comparatively large core, usually a step-index type. there is no standard definition of “large,” but they are generally considered as fibers with diameters of 400 microns o... |
| multimode fiber (mmf) | An optical waveguide that allows more than one mode to be guided. 50/125, 62.5/125 and 100/140 are the most common. graded-index types are used in fiber optic communication systems |
| radio frequency over glass (rfog) | An scte 174 standard released in 2010, rfog addresses pon network transmission for the catv industry |
| one type is those that convert signals between electrical | And optical formats such as lasers, leds, and photodiodes |
| synchronous optical network (sonet) | - Ansi-standard physical interface defined by its optical line rates known as optical carrier (oc) signals, frame format and oam&p protocol. adopted by the itu as sdh
- A standard f...
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| interexchange carrier (ixc) | Any common carrier that provides long-distance services, i.e., sprint or at&t |
| the change in charge across the junction is monitored | As a current in the external photodiode circuit. silicon photodetectors are commonly used in multimode systems operating at 850 nm |
| community antenna television (catv) | Assumed to be cable television, catv uses fiber and coaxial media to provide voice, video, or data services |
| machine polishers | Automated polishers that are capable of polishing from two to 32 connectors at one time. these polishers can provide uniform low reflection polishes (e.g., pc, spc, upc, apc) |
| low order modes cause less differential mode delay (higher | Bandwidth) |
| ethernet pon (epon) | Based on ieee 802.3ah protocol for ethernet, epon is a network data transport using a variable length packet structure up to 1,518 bytes at data rates up to 1,000 mb/s over single-mode fiber. the ... |
| plain old telephone service (pots) | Basic telephone service, dial tone without special features |
| cd is a limiting factor in high-speed transmission and must | Be properly compensated, which implies proper testing. a combination of material and waveguide dispersion |
| optomechanical switch | Bipolar switch, based on moving fibers or mirrors, that moves optical signals between fibers |
| quadplexer | Commonly known as a passive wdm, this transceiver package performs four multiplexing or demultiplexing functions. used in 10 gigabit olts when coexisting with legacy pon systems |
| triplexer | Commonly known as a passive wdm, this transceiver package performs three multiplexing or demultiplexing functions |
| uv connectors | Connectors manufactured with a clear body and ferrule to allow the curing of ultraviolet adhesive, bonding the fiber optic inside the ferrule |
| short wavelength | - Considered 850 nm and lower in wavelength. also covers the visible range (630-700 nm) signal-to-noise ratio (snr) the ratio of the power of the signal versus the power of the background noise,...
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| premises | - Defined as the subscriber’s home or place of business. in a multiple dwelling unit, each apartment is counted as one
- Land and/or its appurtenances.
- `premises` means build...
помещение; |
| encircled flux (ef) | Defined by iec 14763, tia 455-203, and ieee 802.3ae, ef is the most accurate test for determining optical attenuation for multimode fibers. most often used in factory environments due to its compl... |
| e-band | Defined by itu-t g.692 as “extended” for wavelengths between 1360 and 1460 nm. this band includes the high oh peak in single-mode fibers. g.652d fiber is designed for transmission within the exten... |
| latency | - Delay of a signal in time, which can be caused by transmission, processing, rotation, and propagation delays
- The amount of time it takes for the client request for a fragment to be ...
латентность; период латентный; время запаздывания; задержка; время задержки; время ожидания;; скрытое состояние; latency time; латентностьзадержка вращения (диска) latent латентный; скрытый latent failure неявный отказ; скрытый отказ latent fault скрытая неисправность; скрытый дефект latent image скрытое изображение latent period время ожидания; период,латентный; |
| mode conditioning patchcord (mcpc) | Designed for gbe and fibre channel links using legacy multimode fibers and vcsel light sources operating at 850 nm. normally it is a pair of duplex jumpers that are installed between the transmiss... |
| mean time between failure (mtbf) | Developed by the military to estimate maintenance or replacement times for various pieces of high-end equipment, mtbf is based upon statistical evidence derived from in-use testing under extreme c... |
| fiber to the home (ftth) | - Distribution of communication services by providing fiber optic links all the way to each house. protocols include active ethernet and pon systems as defined by the ieee, itu, and scte
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| as-builts | Drawings that provide accurate depictions of cable running lines, pedestal locations, electronic sites, manholes, marker posts, etc., to aid with the management of cable assets and allow the facil... |
| continuous wave (cw) | Energy is emitted from a module continuously, rather than in short pulses. cw applications require the laser to be on at all times. constant output from an optical source that is active but not mo... |
| loss windows | Fiber optic transmission typically occurs at 850, 1300/1310, 1550, and/or 1625 nm. these “windows” were selected because absorption and scattering losses were lower within them. these wavelengths ... |
| telcordia technologies (bellcore) | Formerly known as telcordia-bell communications research, it is the unofficial standards development body providing technical specifications for the rbocs |
| strain relief | - How a cable’s physical load is attached and addressed at the rear of a connector. in fiber optic cable assemblies using a 3-mm cordage, the aramid yarn is epoxied or crimped to provide the str...
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| gigabit ethernet | Ieee 802.3z. a standard for a high-speed ethernet, capable of transmitting data at one billion bits per second. it provides increased network bandwidth and interoperability, and can be used in bac... |
| macrobending | - In an optical fiber, all macroscopic deviations of the axis from a straight line; distinguished from microbending
- In a fiber, all macroscopic deviations of the fiber’s axis from a s...
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| brillouin scattering | - In stimulated brillouin backscattering (sbs), the laser signal creates periodic regions of altered refractive index; that is, a periodic grating that travels as an acoustic wave away from the ...
bs; рассеяние бриллюэна; |
| stranded cable | In stranded cables, individual color-coded buffer tubes are wrapped or “stranded” around the cable’s central strength member |
| bend loss | - Increased attenuation due to macrobends (curvature of fiber) or microbends (small distortions in the fiber) coupling light energy from the fiber core to the cladding
- Потери на изгиб...
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| dry fit | It is when fiber is inserted into a plug’s ferrule or termini to verify the strip length and fit prior to insertion of the bonding adhesive. this helps the technician to recognize the “feel” of th... |
| splitters used in fttx installations are specified by the | Itu g.671 standard as wavelength independent couplers (wic), which provide the same attenuation regardless of wavelength or direction |
| pulsed lasers | - Lasers that emit energy in a series of short bursts, or pulses, and are inactive between each pulse. they typically deliver several watts of peak power per pulse
- Lasers emitting lig...
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| long wavelength | - Light in the 1300-nm, 1550-nm, and 1625-nm wavelengths loose tube cable a type of cable where the internal 250-micron fibers are loose within buffer tubes. types include stranded, central tube...
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| extrinsic loss | - Loss caused by imperfect alignment of fibers in a connector or splice such as lateral offset, angular misalignment, end separation, and end finish
- Splice losses arising from the spl...
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| interference bands | Measured on an interferometer, the dark lines or “bands” optically projected across the face of an object to determine its shape by means of measured elevation |
| splice-on plugs use a prepolished fiber stub and then are | Mechanically or fusion spliced. military, industrial, and heavy-duty specialized connectors may use expanded beam lenses and termini contacts (instead of ferrules) based on standard mil/aero dimen... |
| fiber amplifier | - Most common are the erbium doped fiber amplifiers (edfas), semiconductor optical amplifiers (soas), and raman amplifiers, which are used to increase signal gain without electrical conversion
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| overbuild | Network deployment in an area that is served by an incumbent network operator. although the services offered by the new provider may differ from those offered by the incumbent provider(s), some de... |
| fillers | - Nonconducting components cabled with optical fibers to impart roundness, flexibility, tensile strength, or a combination of all three to the cable
- An extensive variety of solid subs...
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| nanosecond (ns) | One billionth of a second, expressed as 10–9 seconds |
| matched-clad optical fiber | Optical fiber with a cladding of consistent refractive index up to the core boundary, resulting in the desired single-mode step-index profile. used where fibers of different periods are spliced to... |
| optoelectronic | Pertaining to a device that responds to optical power, emits or modifies optical radiation, or utilizes optical radiation for its internal operation |
| pin diode | Positive intrinsic negative diode, a type of photodiode used to convert optical signals in a receiver. can be used with both analog and digital systems |
| network architectures are usually designed as to their | Protocols. b-pon, g-pon, epon, gepon, sonet, atm, ethernet, etc., are examples of network architectures |
| centralized cabling | Provides connections from the work areas to the centralized cross-connect by allowing the use of pull-through cables, an interconnect, or splice in the telecommunications closet |
| output power | - Radiant power, expressed in watts
- The energy per second (measured in watts) emitted from the laser in the form of coherent light.
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| physical contact (pc) | Refers to the endface polish of a ferrule. designed to lower reflections by changing the spherical or angle at the end of a ferrule and its internal fiber. variations include pc, super pc (spc), u... |
| fresnel reflection | - Reflection of a portion of the incident light at a planar interface between connectors, mechanical splices, or two homogeneous media having different refractive indices
- Френелевское...
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| microduct cable | S are designed for high-density fiber counts in a small optical cable, normally between 5-16 mm |
| mini otdr | S emerged in the 1990s as a low-cost, lightweight version of the mainframe otdr. features include ac/dc power, lcd display, and various modules for specific fiber types and corresponding wavelengt... |
| stapler cleaver | Shaped similar to a stapler, its blade is made from a material sharp enough to nick the fiber optic and, by pressing down on a flexible tongue, cleaving the fiber optic. most often used in a cleav... |
