IECTR62839-1:2014IEC2014 - 11 - 4.2.3.4 Optical fibrecables Optical fiber cables are mainly used for computers networking on medium-sized to large distances. Used network protocols establish optical fiber type: either the multimode fiber, or the single modefiber.In optics, attenuation depends on the wavelength. The distances of multimode fiber optical local networks are from 3oo m to maximum 2 oo0 m.150 m length is used, consensually, to calculate the optical signal attenuation at the Reuters( wavelength of the considered protocol because it represents theworst case. Distances in single-mode fiber optical local networks are less than 10 km.500 m length is (Scientific), used consensually to calculate the optical signal attenuation in the wavelength of the consideredprotocolbecauseitrepresentsthe worstcase. Inc., The attenuation is not proportional to the length but is exponentially related. This value is then reduced to the chosen functional unit, 1 m of cable. For the optical signal losses calculation, we will use the most impacting wavelength for attenuation for both types of optical fibers (as we don't know which one will be used by the final customer), that is to say 850 nm for multimode fibers (OM)and 1 310 nm for the single mode fibers (OS). Average lengths to estimate line losses are identified in Table2 downloaded on Nov-27-2014 by James Madison. I a) Use phase losses determined bymeasurement For theusephaselosses determinedby measurement,theformula issued fromphysics of transmission will be used: (Pe - Ps)× NbFo Plost Laverage Att Ps = Pe ×10~10 Conversion mW in dBm: P(dBm) P(mW) = 10 10 where No further I Plost is the loss of optical signal in watts/meter of cable; is the input power in watts; Ps is the output power in watts; Att is the cable attenuation in dB at a used wavelength for an average length ge) in meters. Wavelengths and installation average length are specified in the chart above. The measurement method of linear attenuationisdescribedbyIEC 60794; NbFo is the number of optical fibers in the cable; Laverage is the average length of installed cables in meters. In all cases,the value obtained in watts has to be multiplied by the lifetime of the corresponding application forthe power in Wh or joules (see Annex A). Generally, choices will be identified in the PEP/PCR and justified in the LCA report Uncontrolled when opyi righted material - 12 - IECTR62839-1:2014@IEC2014 lice b)Usephaselossesdeterminedbystandards The maximum attenuation values at the reference wavelength are 3,5 dB/km (IEC 60793-2-10) for multimode fibers and 0,4 dB/km for single-mode fibers. Table 2 includes all the data to use for the optical cables from reference standards (cable performance standardIEC 60793,IEC 60794and Ethernet IEEE standard 802.3). Table2-Optical cables Optical fiber cables Wavelength Average Protocol Optical fiber Maximum Power consumption Reuters type distance length nm m (Scientific), 10GBASE-SR 00m> Attenuationat850nm:3,5dB/km 1000BASE-SX 500 m Injected power=0 dBm leading to 1 Multimode 850 150 mw Inc. Leading to 0,76 mw/km or 10BASE-FL 2 km 0,76 μW/m of 1FO 100BASE-LX 2 km to 3 km Attenuation at 1 310 nm: 0,4 dB/km 1000BASE-LX 2 km Injected power=0 dBm Single mode 1310 500 ns leadingto1mw 10 km 10GBASE-LR Leading to 0,09 mW/km or 0,09 μW/m of 1FO .com 4.2.4 Lifetime and use rates dov The lifetime and use rate of communication and data wires and cables were consensually determined by all the technical experts of the profession for the different possible application areas. This hypothetical lifetime is always less than the product real life. Any wire or cable,according to standards to which it corresponds to,belongs to a single application. Table A.1 includes the different fields of application covered for wires and cables, and specifies the products lifetime and their use rate leading to use time to take into account in the calculations. In the exceptional case an application is not described by Table A.1, and to e