The link budget is not a formal operation in the laboratory, it determines whether a fiber optic cable can really run at the nominal rate.There are only three steps, write down the source of each number,

and any colleague can review it for you. Step 1

Take the worst optical port parameter and replace the length with the attenuation Copy three items from the specification: the minimum transmit power, the lower limit of the average transmit power, and the reception sensitivity.Cross-brand links should be calculated according to the combination of minimum transmission and maximum reception sensitivity, not just typical values.The length is converted to 0.35 dB/km for the single-mode 1310 window and 0.25 dB/km for the 1550 window, and about 3 dB/km for the multi-mode 850 window, and then multiplied by a construction margin

of 1.05 to 1.1, covering the tray residual

and laying stretch. Step 2 Incorporate joints, welding and aging allowances Each pair of active connectors is 0.3 to 0.5 dB, and each weld is 0.05 to 0.1 dB. The adapter on the ODF distribution frame is also counted, and finally the aging allowance of 3 dB is uniformly left, covering temperature drift, end surface pollution and the

third step is to check the receiving end balance,

and change the unqualified one. The minimum transmission power is -9 dBm minus the total loss of 7.8 dB, and the reception terminal is about -16.8 dBm; if the reception sensitivity is -17 dBm and the margin is less than 1 dB, this link is unqualified.There are two modifications: first, review the joints and bends to press down the actual loss; orchange the model with a wider power budget, suchas fromSFP Gigabit Single Mode Dual Fiber 10km Optical Module Upgradeto SFP 2.5g Single Mode Dual Fiber 20km Optical Module, the margin can usually bepulled above 3 dB.The complete parameters of the campusbackbone can be referenced Comprehensive wiring scheme for campus network and FTTH, EB-LINK Technical Support can be contacted at 0755-83179002.