Cat 5 out of scope question

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1

Originally Posted By: rbennett
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http://www.nachi.org/bbsystem/usrimages/D/DSC03263.JPG ]

2

Originally Posted By: jonofrey
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There’s nothing wrong with it.

–
Inspection Nirvana!


We're NACHI. Get over it.
3

Originally Posted By: rbennett
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John



Thanks

Have a good day

RLB

4

Originally Posted By: bsumpter
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We were told NEVER to staple any CAT 5 cable.

–
“In the fields of observation, chance favors only the mind that is prepared”


Louis Pasteur
5

Originally Posted By: rbennett
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- cable problems are addictive so do every thing as clean as possible with the best workmanship as possible in all areas


Can anyone site any standards - I think FCC under building and COE phone equipment or NEC

I can't find anything yet?? but might be looking in the wrong area

RLB

6

Originally Posted By: Greg Fretwell
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This is just basic transmission line protocol. If you change the relationship of the twisted pairs in the jacket you will change the impedance and cause standing waves on the signal. Anything from a kink in the cable to a staple crushing the twists will do that.


At the modest data rates we push down CAT5 with our 10/100 Enet in a home network you will probably never see it but if you have a gbit LAN with a heavy load, it will show up.


If an installer was careful not to crush the cable with his staples and he avoided kinks or sharp bends, there would not be a problem.

7

Originally Posted By: jonofrey
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Alrighty then! You guys are gonna make me strain to remember my RCDD days. The best source of information for this topic is BICSI (building industry consulting service international).


Your reference standards are EIA/TIA-570 (Residential and light commercial telecommunications wiring standard).

IEEE 802.3 (10baseT twisted pair standard).

You might find something there that I don't know.

Happy hunting.

--
Inspection Nirvana!

We're NACHI. Get over it.

8

Originally Posted By: rbennett
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Thanks all


I think these "Low Voltage" standards are becoming as important as their big brother hi voltage. With the cost of test equipment coming down and the client need going up, I can see the HI's becoming more of a knowledge source.

Quality workmanship is still the best standard

RLB

9

Originally Posted By: Greg Fretwell
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The place this becomes immediately obvious is on a (TDR) scope.