CHAPTER 2: REQUIREMENTS / CONFIGURATIONS2-4EMM-E6 User’s Guide2.1.2 Multimode Fiber Optic NetworkWhen connecting a multimode fiber optic link segment to the hub (viaEPIM-F1/F2), ensure the network meets the following requirements:• Cable Type - Use the EPIM-F1 and EPIM-F2 for the followingmultimode fiber optic media:- 50/125 μm fiber optic cabling- 62.5/125 μm fiber optic cabling- 100/140 μm fiber optic cabling• Attenuation - You must test the fiber optic cable with a fiber opticattenuation test set adjusted for an 850 nm wavelength. This testverifies that the signal loss in a cable falls within the followingacceptable levels:- 13.0 dB or less for a 50/125 μm fiber cable segment- 16.0 dB or less for a 62.5/125 μm fiber cable segment- 19.0 dB or less for a 100/140 μm fiber cable segment• Budget and Propagation Delay - When you determine themaximum fiber optic cable length to incorporate fiber runs into yournetwork, you must calculate and consider the fiber optic budget (atotal loss of 10.0 dB or less is permissible between stations) and totalnetwork propagation delay.To determine the fiber optic budget, combine the optical loss due tothe fiber optic cable, in-line splices, and fiber optic connectors.Typical loss for a splice and connector (together) equals 1 dB or less.Total propagation delay allowed for the entire network must notexceed 25.6 μs in one direction (51.2 μs round trip). If the totalpropagation delay between any two nodes on the network exceeds25.6 μs, you must either reduce the delay or use a bridge.• Length - The maximum possible multimode fiber optic cable lengthis 2 km (2187.2 yards). However, IEEE 802.3 FOIRL specificationsspecify a maximum of 1 km (1093.6 yards).
