Cabletron Systems CyberSWITCH CSX400 Installation Manual

Also see for CyberSWITCH CSX400: Setup guide Configuration guide User guide User guide User guide

Contents

Network RequirementsCyberSWITCH CSX400 and CSX400-DC Installation Guide3-3Temperature — Multi-pair PVC 24 AWG telephone cables typically have an attenuation ofapproximately 8–10 dB/100 m at 20°C (68°F). The attenuation of PVC insulated cable variessignificantly with temperature. At temperatures greater than 40°C (104°F), Cabletron Systemsstrongly recommends using plenum-rated cable to ensure attenuation remains within specification.Multimode Fiber Optic NetworkWhen connecting a multimode fiber optic link segment to the CSX400 (using an EPIM-F2), ensurethat the network meets the following requirements:Cable Type — Use the following multimode fiber optic media:• 50/125 μm fiber optic cabling• 62.5/125 μm fiber optic cabling• 100/140 μm fiber optic cablingAttenuation — Test the fiber optic cable with a fiber optic attenuation test set adjusted for an850 nm wavelength. This test verifies 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 segmentBudget and Propagation Delay — When you determine the maximum fiber optic cable lengthto incorporate fiber runs into the network, calculate and consider the fiber optic budget (a total lossof 11.0 dB or less is permissible between stations) and total network propagation delay.To determine the fiber optic budget, combine the optical loss due to the fiber optic cable, in-linesplices, and fiber optic connectors. Typical loss for a splice and connector (together) equals1 dB or less.Network propagation delay is the amount of time it takes a packet to travel from the sendingdevice to the receiving device. Total propagation delay allowed for the entire network must notexceed 25.6 μs in one direction (51.2 μs round trip). If the total propagation delay between anytwo nodes on the network exceeds 25.6 μs, you must use bridges or switches.Length — The maximum possible multimode fiber optic cable length is 2 km (1.24 miles).However, IEEE 802.3 FOIRL specifies a maximum of 1 km (0.62 miles).