Network Switches

This is a data sheet from a typical Ethernet pulse transformer for 10/100/1000-T


https://product.tdk.com/info/en/catalog/datasheets/090007/trans_alt_en.pdf?ref_disty=digikey

While common mode rejection can be 30-40db, the insertion loss, i.e. losses in sending an actual signal, are quite low, 1-2db, even at 100KHz. 1 transformer at either end, so 2-4db attenuation at 100Khz, which is not a lot.


The question is, how good were the circuit designers at either end in ensuring noise didn't get onto or coupled from the Ethernet "signal"?

... losses in sending an actual signal, are quite low, 1-2db, even at 100KHz.

... and I would emphasize that losses are even a good deal less than 1-2 db at 100 MHz, as can be seen in the graphs.

The question is, how good were the circuit designers at either end in ensuring noise didn’t get onto or coupled from the Ethernet "signal"?

+1.

Thanks for providing the link.

Best regards,
-- Al

@almarg , absolutely. I got PWM mixed up with PCM. Thank goodness, otherwise we would have needed coax to make this work. 1.76 MHz is still up there, especially when a fourier series is considered to accurately shape the square wave so the decoder can due it's job,  

I received the  "Silent Angel" Bonn N8  Ethernet Network Switch yesterday and plan to hook it up today.
My question is whether to connect it close to my router or close to my server?  The router and server are connected by a 35-foot Ethernet cable.
If close to the router I can use my HD Plex LPS that is powering my router to also power the switch, but if close to the server then I would have a very short cable from the switch to the server and would probably use the Bonn N8 PS to power the switch.  If close to the server, I can plug the Bonn's PS into my Isoclean 60A3 II power filter.  Otherwise, if the switch is close to the server, I can use the router's own power supply to power the router, and move the Plex LPS close to my server, plug it into the Isoclean 60A3 II, and use it to power the switch.  Any clear direction or do I need to do some trial and error?  Which option do you guys presume would be best? Thanks

@mitch2   Based on my understanding of your post and questions....I would place the N8 Switch close to your Server. Run the long cable from your Router to the N8 Switch. I believe this will give you the best performance. As always, you will need to work through the options to find out for yourself and your system.

Looking forward to learning about how it works out!