| microduct | Small hdpe ducts up to 16 mm in diameter that can be installed in empty or partially filled ducts to provide space for microduct fiber optic cables |
| operational support system (oss) | Software that furnishes tools to provide network control, monitoring and business functions |
| dispersion-shifted fiber (dsf) | - Specified by itu-t g.653, this fiber provides low attenuation and dispersion at 1550 nm. it could not be used with dwdm as it caused four wave mixing, and has been obsoleted and replaced by g....
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| dense wavelength division multiplexing (dwdm) | Specified by itu-t g.694, dwdm is the transmission of multiple optical wavelengths over a single-mode fiber with spacings of 200 ghz (1.6 nm), 100 ghz (0.8 nm), or 50 ghz (0.4 nm). first implement... |
| optical-electrical-optical (oeo) | Specifies a network switch that receives an optical signal, and demultiplexes, switches, multiplexes and re-transmits the signal optically. can perform 3r functions |
| gigabit pon (g-pon) | Standardized in itu-t g.984, g-pon handles data rates up to 2.5 gb/s and allows split ratios up to 1:64. the standard features the g-pon encapsulation method (gem), which allows for the transmissi... |
| fiber optic test procedure (fotp) | Standardized methods for testing various fiber optic components, as specified in the tia-455 standard |
| equilibrium modal distribution (emd) | Steady-state modal distribution in multimode fiber, achieved some distance from the source, where the relative power in the modes becomes stable with increasing distance |
| sc connector | - Subscriber connector, a push/pull connector style that is recognized as the preferred optical fiber connector standard. it is available in simplex, duplex, hybrid, or hardened styles
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| take rate | Subscribers divided by homes connected. expressed as a percentage, it can also be based on each type of service, i.e., take rates for data, video, voice, or triple/quadruple services |
| power meter | - Test equipment that measures the optical power (dbm) and attenuation (db) in a fiber optic connector, fiber optic cable, or fiber optic system
- An accessory used to measure laser bea...
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| the patch panels at each end are points of access for | Testing, as well as a point of separation of responsibilities for the transmission network |
| cutoff wavelength | - That wavelength greater than which a particular waveguide mode ceases to be a bound mode. when transmitting lower than a single-mode fiber’s cutoff wavelength, the fiber transmits multimode. f...
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| l-band | - The “long” dwdm transmission band, occupying the 1565 nm to 1625 nm wavelength range
- Wavelengths of about 1570 to 1625nm where some erbium-doped fiber amplifiers operate. separate f...
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| o-band | The “original” transmission band, occupying the 1260 to 1360 nm wavelength range, with a center wavelength of 1310 nm. used in ftth standards for upstream transmission |
| s-band | - The “short” dwdm transmission band, which occupies the 1460-1530 nm wavelength range
- A proposed designation for wavelengths of 1460 to 1530nm, where optical amplifiers based on thul...
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| u-band | The “ultra long” dwdm transmission band, occupying the 1625-1675 nm wavelength range |
| water migration | The act of water traveling through a breach in the outer jacket(s) of a telecommunications cable, moving along the conductors due to capillary action. a corrosive action as the water reacts with t... |
| excess loss | - The amount of light lost in a coupler, beyond that inherent in the splitting to multiple output fibers
- Loss of a passive coupler above that inherent in dividing light among the outp...
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| optical loss | - The amount of optical power lost as light is transmitted through fiber, splices, couplers, etc. also known as attenuation; measured in db
- Оптические потери
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| optical power | - The amount of radiant energy per unit time, expressed linearly (watts) or logarithmically (db)
- The energy per unit time, e.g. transported by a laser beam, or a focusing power
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| central office (co) | The building in which telephone companies, etc., locate their switching equipment and terminate their circuits |
| wavelength division multiplexing (wdm) | The combining of two or more optical signals for transmission over a common optical path, usually a single fiber. wdm devices have a channel wavelength spacing greater than or equal to 50 nm. they... |
| docsis | The data-over-cable-service interface specification that permits a cable modem termination system to be designed as either a layer 3 router or layer 2 switch. used by the catv industry data over cable interface specification; |
| electrode | - The device in a fusion splicer that discharges the electric energy, fusing two or more fibers together
- The conductor of an electrical apparatus which touches the body and carries an...
электрододержатель; электрод; электрод, губчатый; |
| optical signal-to-noise ratio (osnr) | The difference between the signal being transmitted and the noise being created by an optical laser’s pulse. the higher the osnr, the better the quality of service |
| angular misalignment | - The fiber optic cores of a mated pair of connectors are held at an angle, either by mispolish, worn alignment sleeve, or contamination
- Loss at a connector due to fiber end face angl...
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| light source | - The fiber optic transmitter in an optical loss test set (olts) that uses one or more leds or lasers at specified wavelength. lasers used in communication systems must be stabilized and operati...
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| optical distribution network (odn) | The fibers, splitters, couplers, etc., in a passive optical network that provide the optical transmission means from the olt to the users, and vice versa |
| broadband pon (b-pon) | The first fttx standard issued as itu-t g.983, the b-pon standard was designed for the bidirectional transmission of atm cells over g.652 single-mode fiber at a distance of 20 kilometers using wav... |
| bayonet fiber-optic connector (bfoc) | The formal name for the st connector, a specific slotted twistlock connector with 2.5-mm ferrule |
| electromagnetic interference (emi) | - The frequency spectrum of electromagnetic radiation that extends from subsonic frequency to x-rays. not to be used in place of “rfi”
- Noise generated when stray electromagnetic field...
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| local access and transport area (lata) | The geographic area that is the domain of the local exchange carrier. bell operating companies are generally precluded from carrying traffic across lata boundaries; this traffic must be handed off... |
| depressed-clad optical fiber | The inner cladding, next to the core, has a lower index of refraction than the outer cladding region. depressed refers to the ior mismatch between the two claddings, resulting in a small mfd that ... |
| laser-optimized multimode fiber | The iso/iec 11801 standard defines two types: the om3 50/125 fiber, with an effective modal bandwidth of 2,000 mhz-km at 850 nm, and the om4 50/125 fiber, with 4,700 mhz-km bandwidth |
| last mile | - The last mile is the local access network that extends from the co to the end-user subscriber. also called the local loop network, it is traditionally copper-based and suffers from the bandwid...
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| backreflection | The loosely-used term covers optical return loss (orl) for spans, reflectance for components, and fresnel reflectance |
| center wavelength (cw) | The nominal value operating wavelength in a laser; thereby, the wavelength defined by a peak mode measurement where the effective optical power resides |
| coupling loss | The optical attenuation of a connection or passive device, expressed as a value in db |
| end separation loss | The optical power loss caused by distance between the end of a fiber and a source, detector, or another fiber |
| jacketing | - The outer jacket of a cable, which can be made from a variety of materials including but not limited to hdpe, mdpe, pvc, et. al
- Материал для переплетов, чехлов и т.п.
обделка; |
| point of presence (pop) | The physical location where a long-distance carrier terminates lines before connecting to the local exchange company, another carrier, or directly to a customer |
| optical line terminal (olt) | The pon controller card or unit located at the service provider. the laser at the olt is frequently a dfb laser that transmits at 1490 nm or 1550 nm and is always on |
| mode field diameter (mfd) | The portion of a single-mode fiber that actually transmits the light energy. generally 20% larger than the physical core. the size of the mode field varies with wavelength |
| it provides the transition between the outside plant and | The premises. the entrance facility can connect to telecom, utility, or communication rooms or closets |
| glass blank | The pure, solid glass mass formed after sintering an oxide preform. this glass blank undergoes a drawing process to become optical fiber |
| fiber surface finish | The quality of the polishing at the end of the fiber (1 mm, 0.3 mm, etc.). some terms that describe a poor surface finish are: mist, hackle, chipped, or cracked |
| backscatter coefficient | The ratio of the optical pulse power (not energy) at the otdr output to the backscatter power at the near end of the fiber (z0). this ratio is inversely proportional to the pulse width, because th... |
| index of refraction (ior) | The ratio of the speed of light in a vacuum to the speed of light in a material. when light strikes the surface of a transparent material, some light is reflected while some is bent (refracted) as... |
| rayleigh scattering | - The scattering of light into a direction generally reverse to the original one. the principle on which otdrs operate; the scattering of light caused by index of refraction variations in the su...
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| super physical contact (spc) | The spherical endface polish of a ferrule and fiber that is performed on a polishing machine. typically 50 db return loss. superseded by the upc polish |
| low-smoke zero halogen (lszh) cable | The standard cable used in europe in place of plenum or riser cable types. internationally, lszh cables are used in place of plenum and riser cable jackets. in north america, lszh cables are used ... |
| optical return loss (orl) | - The sum of the amount of light reflected from all optical fibers and components. the fiber, connectors, or splices in an optical system can cause the reflection
- The ratio (expressed...
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| customer premises equipment (cpe) | - The telecommunications terminal equipment located on the customer’s premises, including telephones, private branch exchanges, and data terminals
- Terminal, associated equipment, and ...
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| rise time | - The time required for the leading edge of a pulse to rise from 10% to 90% of its amplitude; the time required for a component to produce such a result
- The time it takes output to ri...
время включения жки; время с момента подачи импульсного напряжения до момента достижения ячейкой рабочего состояния;; |
| loss budget | - The tolerable difference between the light impulse where it originates and the light impulse where it arrives at the receiving end. if too much light power has been lost along the way through ...
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| public switched telephone network (pstn) | - The traditional voice network infrastructure, including both local and long distance service, that has been in use in various parts of the world for the last century
- Коммутируемая т...
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| video over ip | The transmission of video programming over an ip network. if the source programming is digital, it is encapsulated into ip packets. otherwise, it is digitized and usually compressed. it can then b... |
| user network interface (uni) | The user end of an access network, similar to an onu but not necessarily optical |
| chromatic dispersion (cd) | 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 pu... |
| national electrical safety code (nesc) | This outside plant code contains basic safety provisions that cover supply, communication lines, equipment, and work practices of personnel employed by utilities |
| receiver sensitivity | - 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 minimu...
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| cordage | - Tight buffered breakout cables used to build patch cords (jumpers). internally, the fibers are normally one or two 900-micron coated fibers. the term “zipcord” describes a two-fiber cordage to...
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| smaller inner ducts or maxcell are installed to allow cables | To be pulled through. it may be buried, installed aerially, or within a building. common types include smoothwall, ribbed, and corrugated |
| duplex transmission | - Transmission in both directions, either one direction at a time (half duplex) or both directions simultaneously (full duplex)
- Transmission in both directions, either one direction a...
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| polarization mode dispersion (pmd) | - Typical single-mode fibers support two perpendicular polarizations of the original transmitted signal, which may travel at different speeds and arrive at different times. the average differenc...
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| high-density connector | Typically, connectors with multiple fibers in a small form factor housing, i.e., mpo/mtp, mt-rj |
| reconfigurable oadm (roadm) | Unlike oadms, roadms can be managed via a network connection without need for a truck roll. they function as optical switches, allowing for remote service changes, and provide an express wavelengt... |
| optical time-division multiplexing (otdm) | Use of optical processors to multiplex, process, and demultiplex signals to achieve higher speeds. there are two fundamentally different types of otdm, interleaved and slotted. otdm may well be a ... |
| optical density (od) | Used with laser protective eye wear. optical density is the base-10 logarithm by a factor of 1000 |
| optical carrier (oc) | Usually followed by a numerical designator such as 1, 12, 192, etc. used in sonet and atm transmission systems to describe the optical conversion of a synchronous transport signal at a specific ra... |
| moving pictures experts group (mpeg) | Various standards, established by the, that define the amount of compression, and thereby the quality, of the resultant video information file |
| triple play | - Voice, video, and data communications
- The combined offering of voice, video, and data over one line.
triple duración .; |
| overfilled launch condition (oflc) | When a light pulse floods the core of a fiber. since leds produce erratic or incoherent burst of lights, they “overfill” the core when coupled to it |
| aeolian vibration | Wind-induced vibration, usually high frequency, which causes oscillation of cable |
| kellems grip | Wire, aramid or synthetic mesh that is placed around the cable to be installed, intended to provide positive pulling power. also known as pulling or mesh grips |
| annulus | - The figure bounded by and containing the area between two concentric circles.
- A structure shaped like a ring
- Зубчатое колесо
- A geometrical figure. (see ring.)<...
зубчатое колесо; зубчатый венец; затрубное пространство, затруб; аннулюс; кольцо; |
