2-20 B30 Bus Differential System GE Multilin2.2 SPECIFICATIONS 2 PRODUCT DESCRIPTION22.2.9 INTER-RELAY COMMUNICATIONSSHIELDED TWISTED-PAIR INTERFACE OPTIONSRS422 distance is based on transmitter power anddoes not take into consideration the clock sourceprovided by the user.LINK POWER BUDGETThese power budgets are calculated from the manu-facturer’s worst-case transmitter power and worstcase receiver sensitivity.The power budgets for the 1300 nm ELED are calcu-lated from the manufacturer's transmitter power andreceiver sensitivity at ambient temperature. Atextreme temperatures these values deviate basedon component tolerance. On average, the outputpower decreases as the temperature is increased bya factor 1dB / 5°C.MAXIMUM OPTICAL INPUT POWERTYPICAL LINK DISTANCECompensated difference in transmitting and receiving (channelasymmetry) channel delays using GPS satellite clock: 10 ms2.2.10 ENVIRONMENTALAMBIENT TEMPERATURESStorage temperature: –40 to 85°COperating temperature: –40 to 60°C; the LCD contrast can beimpaired at temperatures less than –20°CHUMIDITYHumidity: operating up to 95% (non-condensing) at55°C (as per IEC60068-2-30 variant 1, 6days).OTHERAltitude: 2000 m (maximum)Pollution degree: IIOvervoltage category: IIIngress protection: IP20 front, IP10 backNoise: 0 dBINTERFACE TYPE TYPICAL DISTANCERS422 1200 mG.703 100 mEMITTER,FIBER TYPETRANSMITPOWERRECEIVEDSENSITIVITYPOWERBUDGET820 nm LED,Multimode–20 dBm –30 dBm 10 dB1300 nm LED,Multimode–21 dBm –30 dBm 9 dB1300 nm ELED,Singlemode–23 dBm –32 dBm 9 dB1300 nm Laser,Singlemode–1 dBm –30 dBm 29 dB1550 nm Laser,Singlemode+5 dBm –30 dBm 35 dBEMITTER, FIBER TYPE MAX. OPTICALINPUT POWER820 nm LED, Multimode –7.6 dBm1300 nm LED, Multimode –11 dBm1300 nm ELED, Singlemode –14 dBm1300 nm Laser, Singlemode –14 dBm1550 nm Laser, Singlemode –14 dBmNOTENOTENOTEEMITTER TYPE CABLETYPECONNECTORTYPETYPICALDISTANCE820 nm LED,multimode62.5/125 μm ST 1.65 km50/125 μm ST 1.65 km1300 nm LED,multimode62.5/125 μm ST 4 km50/125 μm ST 4 km1300 nm ELED,single mode9/125 μm ST 11.4 km1300 nm Laser,single mode9/125 μm ST 64 km1550 nm Laser,single-mode9/125 μm ST 105 kmTypical distances listed are based on the follow-ing assumptions for system loss. As actual lossesvary from one installation to another, the distancecovered by your system may vary.CONNECTOR LOSSES (TOTAL OF BOTH ENDS)ST connector 2 dBFIBER LOSSES820 nm multimode 3 dB/km1300 nm multimode 1 dB/km1300 nm singlemode 0.35 dB/km1550 nm singlemode 0.25 dB/kmSplice losses: One splice every 2 km,at 0.05 dB loss per splice.SYSTEM MARGIN3 dB additional loss added to calculations to compensate forall other losses.NOTE
