Switch User's Guide

Ethernet Cabling Requirements
CSX400 and CSX400-DC User’s Guide 51
Noise Crosstalk, or externally induced impulses, can cause noise. Impulse noise may cause
data errors if the impulses occur at very specific times during data transmission. Generally, noise is
not a concern. If you suspect noise-related data errors, you may need to reroute the cable or
eliminate the source of the impulse noise.
Temperature Multi-pair PVC 24 AWG telephone cables typically have an attenuation of
approximately 8–10 dB/100 m at 20°C (68°F). The attenuation of PVC insulated cable varies
significantly with temperature. At temperatures greater than 40°C (104°F), Cabletron Systems
strongly recommends using plenum-rated cable to ensure attenuation remains within specification.
Multimode Fiber Optic Network
When connecting a multimode fiber optic link segment to the CSX400 (using an EPIM-F1/F2),
ensure that 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 cabling
Attenuation Test the fiber optic cable with a fiber optic attenuation test set adjusted for an
850 nm wavelength. This test verifies that the signal loss in a cable falls within the following
acceptable 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