Enterasys mrxi-22 Guía Del Usuario

 

•

 

 - Intersymbol interference and reflections can cause jitter in the 

bit cell timing, resulting in data errors. A 10BASE-T link must not 
generate more than 5.0 nsec. of jitter. If your cable meets the 
impedance requirements for a 10BASE-T link, jitter should not be a 
concern. 

•

 

 - The maximum propagation delay of a 10BASE-T link segment 

must not exceed 1000 nsec. This 1000 nsec. maximum delay limits the 
maximum link segment length to no greater than 200 meters.

•

 

- Crosstalk is caused by signal coupling between the 

different cable pairs contained within a multi-pair cable bundle. 
10BASE-T transceivers are designed so that the user does not need to 
be concerned about cable crosstalk, provided the cable meets all other 
requirements.

•

 

 Noise can be caused by either crosstalk or externally induced 

impulses. Impulse noise may cause data errors if the impulses occur at 
very specific times during data transmission. Generally, the user need 
not be concerned about noise. If noise-related data errors are 
suspected, it may be necessary to either 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 to 10 dB/100m at 20

 

°

 

 C (78

 

°

 

 

F). The attenuation of PVC insulated cable varies significantly with 
temperature. At temperatures greater than 40

 

°

 

 C (104

 

°

 

 F), it is strongly 

recommended that you use plenum-rated cables to ensure that cable 
attenuation remains within specification.

 

When you connect a Fiber Optic Link Segment to the MRXI with a Single Port 
Fiber Optic Interface Module (EPIM-F1 or EPIM-F2), the following network 
requirements must be met:

 

•

 

 - The EPIM-F1 and EPIM-F2 are designed for use with 

one of 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.