Enterasys csx400 Benutzerhandbuch

CSX400 and CSX400-DC User’s Guide 51

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.

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.

When connecting a multimode fiber optic link segment to the CSX400 (using an EPIM-F1/F2), 
ensure that the network meets the following requirements:

Use the following multimode fiber optic media:

50/125 

µ

m fiber optic cabling

62.5/125 

µ

m fiber optic cabling

100/140 

µ

m fiber optic cabling

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 

µ

m fiber cable segment

16.0 dB or less for a 62.5/125 

µ

m fiber cable segment

19.0 dB or less for a 100/140 

µ

m fiber cable segment