[RFI] Internet Modem / Router Cable Length and RFI

[KD7JYK DM09]

: I love EMT for shielding.  BUT -- to provide shielding, the EMT, like
: any cable shield, must be bonded to the shielding enclosure (or ground
: plane) of the equipment at both ends. Simply grounding the EMT is
: insufficient.

Makes sense.  I could also use metal flexible conduit from one end to the
other and have a continuous piece of metal for the conduit, some even have a
separate bonding wire within them.  Planned to mount the DSL modem/router in
a metal box anyway and use a linear supply.  Conduit connected to the 
enclosure at one end and clamped to the back of the computer at the other is 
reasonable.

"engineers working in computer networking advise many practices that we use
for analog systems should not be used for unshielded CAT5/6/7 cables. We
should not, for example, bundle them, because it creates small
discontinuities in the balance of the pairs, and of the coupling between
pairs."

Wouldn't the balance between the pairs be relative to the pairs, which
wouldn't change, even when bundled, unless it was a bundle of multiple CAT5
cables?  In my case it would be a single cable from point A to point B in a
straight line with about 4' rise at one end and a 6' drop at the other,
enough to get from the router on one floor to a computer on another.

"Putting these cables in EMT could have the same effect. The result is
increased error rates, thus slower data rates."

I guess we'll see what happens when the time comes.  It may turn out
everything is adequately quiet, although I wouldn't completely rely on it.
40' of wire on a broadband hash generator is asking for trouble.

Kurt