REQUIREMENTS/SPECIFICATIONS2-7Fiber Optic BudgetThe fiber optic delay budget, which determines the fiber optic cable’smaximum length, should be calculated and taken into consideration in thenetwork design stage. Fiber optic delay budget is determined by summingthe optical signal loss due to fiber optic cable attenuation, in-line splices,and fiber optic connectors.2.1.4 Single Mode Fiber Optic Cable SpecificationsTable 2-7 shows specifications for the Single Mode Fiber Optic Cablesupported by TPIM-F3.Maximum Trunk LengthsThe maximum trunk cable length between the MicroMMAC-T and otheractive devices is equal to the Maximum Drive Distance as shown inTable 2-7. For passive devices, the combined length of twice the longesttrunk cable plus the longest lobe cable attached to the passive ring segmentmust not exceed the Maximum Drive Distance Trunk Length.AttenuationFiber optic cable must be tested with an attenuation test set adjusted for a1300 nm wavelength. This test ensures that the cable’s signal loss is withinan acceptable range of 10 dB or less for any given single mode fiber opticlink.Table 2-7. Single Mode Fiber Optic Cable SpecificationsCable Type Attenuation Maximum Drive Distance8/125-12/125 μm 10.0 dB or less The max. allowable fiber opticcable length is 10 km (10936yards). However, IEEE 802.5specs allow for a max. of 1 km(1093.6 yards).
