noise from/on network?

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noise from/on network?

Bill Taylor
Hello All,

I recently modified my network by adding a second switch and upgraded three cables to Cat 6.  

I’ve created a network LAG between two switches in hopes of improving transfer speeds from some older Mac computers.  The third cable connects my Gigabit modem to my network.

The nature of setup is such that these network cable are very near my stereo.  Since this modification, I’ve noticed a constant hum in the background of any audio that’s playing.

Can I eliminate this buzz/hum, by replacing the Cat 6 cables with the same, but shielded?

Bill


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Re: noise from/on network?

Bill Rausch
> Hello All,
>
> I recently modified my network by adding a second switch and upgraded
> three cables to Cat 6.
>
> I’ve created a network LAG between two switches in hopes of improving
> transfer speeds from some older Mac computers.  The third cable connects
> my Gigabit modem to my network.
>
> The nature of setup is such that these network cable are very near my
> stereo.  Since this modification, I’ve noticed a constant hum in the
> background of any audio that’s playing.
>
> Can I eliminate this buzz/hum, by replacing the Cat 6 cables with the
> same, but shielded?
>
> Bill

Are you sure that the cables are the cause of the hum? Try disconnecting
one end of the cables and then test the stereo to be sure that they are
the cause of the problem. Usually a hum in a stereo is related to a ground
loop somewhere.


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Re: noise from/on network?

@lbutlr
In reply to this post by Bill Taylor
On 1 Feb 2018, at 09:29, Bill Taylor [hidden email]> wrote:
> I recently modified my network by adding a second switch and upgraded three cables to Cat 6.

Unlikely to be meaningful unless you had *very* old (like previous century) Cat-5 cables.

> I’ve created a network LAG between two switches in hopes of improving transfer speeds from some older Mac computers.  The third cable connects my Gigabit modem to my network.

Do your switches support link aggregation? Most do not.

> The nature of setup is such that these network cable are very near my stereo.  Since this modification, I’ve noticed a constant hum in the background of any audio that’s playing.

Hum in audio is usually caused by either a dirty power draw on the circuit or an open ground/ground loop. Are all your wall plugs properly grounded? Are you using a wall plug that previously wasn't used? What power plugs did you move around? Is anything plugged in to a new power strip.

> Can I eliminate this buzz/hum, by replacing the Cat 6 cables with the same, but shielded?

I wouldn't think so, the amount of current in an Ethernet cable is absolutely miniscule. The only thing that I've seen, computer wise and not power wise, that causes RF interference is USB cables mucking up Bluetooth, but that is because of 1) shared frequency and 2) the very low power of Bluetooth.


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