[Elecraft] OT: Fixing Slow Internet

[Brendon Whateley]

Ed,

It may be worth remembering that CAT5e cable is rated to handle signals of
up to 100MHz. As you move from 10Mb to 100Mb to 1Gb ethernet and beyond,
the demands on the cable increase. For 1000Base-T (1Gb) CAT5 is not
recommended, you are better off with CAT5e. Beyond that, you need CAT6 or
even better CAT6a.

And if you look at the "instalation caviats", they will be familiar to
anyone who has built coax cables...

> Installation caveats
>
> Category 6 and 6A cable must be properly installed and terminated to meet
> specifications. The cable must not be kinked or bent too tightly (the bend
> radius should be at least four times the outer diameter of the cable). The
> wire pairs must not be untwisted and the outer jacket must not be stripped
> back more than 0.5 in (12.7 mm).
>
> Cable shielding may be required in order to improve a Cat 6 cable's
> performance in high electromagnetic interference (EMI) environments. This
> shielding reduces the corrupting effect of EMI on the cable's data.
> Shielding is typically maintained from one cable end to the other using a
> drain wire that runs through the cable alongside the twisted pairs. The
> shield's electrical connection to the chassis on each end is made through
> the jacks. The requirement for ground connections at both cable ends
> creates the possibility that a ground loop may result if one of the
> networked chassis is at different instantaneous electrical potential with
> respect to its mate. This undesirable situation may compel currents to flow
> between chassis through the network cable shield, and these currents may in
> turn induce detrimental noise in the signal being carried by the cable.
>

It seems that any HAM running ethernet to the shack, especially if they
have stray RF floating around, would have more luck with CAT6a which
shields the twisted pairs.

- Brendon
KK6AYI

On Mon, Dec 5, 2016 at 11:52 PM, Edward R Cole <kl7uw at acsalaska.net> wrote:

>
> I'm not a computer wonk; RF is my area of strength, so I figured the phone
> and Internet was kinda like audio stuff.  Guess not.  My guess with the
> cable folded into a bundle it had a lot of crosstalk or capacitive coupling
> which acted like a short at 3.5 MBs.
>
> 73, Ed - KL7UW
>   http://www.kl7uw.com
> Dubus-NA Business mail:
>   dubususa at gmail.com
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