Gregg, I think it depends on your own local cabling and physical environment … as from a Cat switch perspective it makes no difference, as that is after all the purpose of a switch to connect independently multiple devices.
My advice would be site the switch a little distance away (there is a minute advantage in using longer Ethernet leads) and then cable to your streamer … I try and use at least 5 metres with audio unless I am network device patching.
Having the switch some distance away from your audio equipment will isolate you from local EM Ethernet related noise near your switch.
One can always strap a ferrite choke around the Ethernet lead if one is concerned with excessive common mode noise from a particular source.
Simon_in_Suffolk,…I say as @bailyhill ,.see below…
•Simon_in_Suffolk,…There you will probably get the best answer to your musings.
That EtherRegen works superbly in a music-system,.and seems to contribute to even better soundquality than “our” famous Cisco.
Yes,.this has among others…
• @Darkebear.
• @Michaelb.
• @MidnightRambler.
• @simon.pepper.
…reported about in this thread.
Ps: I note via his “likes”,.that our mr.deleting-man still shows an interest for this thread.
This is despite the fact,.that he has now deleted 255 of his total 262 posts.
Very strange,.but good that he still has the interest for this thread 
.
/Peder🙂
Simon
Thank you for the reply.
Best
Gregg
There’s a lot Of info on PoE tests in this thread, e.g. in my and ElMarko posts above.
Search for PoE and PD.
If you go to the first post you can click on any poster to see their posts.
Hi @anon77199223 and @ElMarko ,
I realise this question is probably answered somewhere above, but the thread is so huge now.
Please would you or anyone using the PoE version of the 2960 8 port Catalyst switch (either white or the older blue colour) advise which model(s) in the range ‘sends’ PoE and which model(s) ‘receive’ PoE. It seems that the PoE send 2960 doesn’t always come supplied with the (48V?) power supply. If this is true, what model of power supply is recommended and where can it be sourced?
Thanks
Nigel
This should help - just scroll down to the tables and look for PoE in the Ethernet port columns
Many send with different aggregated power ratings - and only one in the table receives - WS-C2960PD-8TT-L. I don’t believe this device comes with a 48v power supply (mine didn’t) - you would need to order separately if you separately wanted to power outside of PoE which it is really designed for. Quite honestly there is no benefit in this model unless you are planning to power via PoE
The PoE source switches are typically (i think always but can’t be categoric) mains powered - because of the significant power budgets - far higher than a PoE or PoE+ link can provide.
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Hi Simon,
Uptone are planning a Whitepaper on the design fundamentals of the EtherRegen switch, and the selection of components etc. It should also include measurements and hopefully how these were taken. This is being put together by the desginer John Swenson, as Uptone Audio has no Marketing department!
So rather than try and pick out the details from the extensive thread on the Uptone forum, and second guess what has been implemented - could we wait for this?
Thanks Simon, very helpful.
Simon, do you know if there are any switching chipsets specifically designed for low-noise applications like Ethernet audio? I doubt boutique switch manufacturers would have the experience or resources to design and fab a dedicated audio switch chipset so I’m guessing they are stuck with whatever off-the-shelf designs are available. Is that a reasonable assumption?
Ah, yes definitely, I had no idea this was going to be produced.
From your previous post, it does however seem that the form factor and physical layout of the switch was established because of the size of the existing box and economic reasons for selecting that box, and these factors may have lead to some electrical compromises in the design.
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Hi All, just finished the setup, the NDX and Core connect to the upper 2960 and use fibre connect to other 2960L.
How do you think use the fibre instead of RJ45 for isolate noise ? 
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There are lots of posts about that above.
if you can find them
e.g. by Charles Photo et al
perhaps search for Sonore optical module - but some also have tried other fibre optical solutions
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Noted and Thanks
In a parallel universe, on the planet Zarg, in an absurdly long thread about swizzes and cabbules, a bloke called Jimbledog told a bloke called ‘I’m only making plans 4 Nigel’ in a purple fez, this:
yes, your PD switch is fine to receive (but not give power) - PD means powered device.
you just plug a normal LAN cable into its uplink port from a PoE switch.
The 8TCL is the classic switch we’ve all been using on the forum for ages.
It’s not PoE - i.e. it cannot send leccy with data along the LAN cable.
You’ll need a PoE switch to do that.
There’s a post earlier in this thread from El Marko where he uploaded a table of PoE switches.
He also names his PoE switch which is the same as mine IIRC. And SiS names his too - which IIRC is a Catalyst 3560. And Charles also names his PoE models.
Just looked it up - my PoE switch is a WS-C2960CPD-8PT-L and I paid £152 with smps and delivery - make sure you get the smps with the correct spec - I got it from ECProf, who had several in stock.
I recommend getting the one that Marko and I have as it’s externally powered.
In the UK fleabay this particular switch is quite rare to find in good nick at a good price from a seller with a good rating, in my experience.
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The smps that I got with my PoE (i.e. the power-sending) switch has the word LITEON stamped on it.
There are also other PoE switches, but that’s the one I got and it works well in that combination.
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Both of my 2960 V3 models did…
Good grief Peder, you do go on and on and on and…
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Cheers JimDog, yes my memory is getting dodgy these days, please forgive a forgetful old git like me.
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Simon
Of course we can - I look forward to it
Simon
Yes Texas Instruments make some low noise line driver chips for Ethernet applications, specifically their PHYTER products such as the DP83848K. I am sure other manufacturers do so as well.