[SI-LIST] Main attenuation effect of long cables

Si list,

With standard 100ohm twisted pair cable (such as cat 5e or cat 6)
 when they reach high frequencies (100MHz) at 10Metres, what is the
 main factor that causes the attenuation.  Here are some options,

1. The AWG of the conductors
2. The dielectric properties (if the pairs are enclosed)
3. Transmission line effects, reflections
4. Crosstalk, NEXT, FEXT.
5. Noise pickup.

The signal transmitted would be LVDS.

Also I have read Doug Smiths excellent note on the comparison
 of the EMC performance of shielded versus unshielded cables.
Does any one else have views on whether its worth using a shielded
 cable for 100ohm twisted pair data transmission?


Any help would be much appreciated

Thanks in advance

Chris   


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