ethernet base1000 to base100 connection & questions.
Sniper2 , 07-25-2024, 04:14 AM
So I have a incoming base100 ethernet port and a base1000 phy on my pcb .I have 2 rx and 2 to pairs and I assume it matters what pairs I connect to the base100 connector. I assume it is the first pair of each. Am I correct? Also regarding the unused pairs is it OK to leave them floating? Or should I terminate them with 100ohm ?
Sniper2 , 07-26-2024, 01:15 PM
Yes I should terminate
Robert Feranec , 07-26-2024, 02:12 PM
I believe 1000BASE should be able to recognize it is talking to 100BASE ... I don't remember doing any special termination. BTW, this is an interesting website, can help: https://www.practicalnetworking.net/stand-alone/ethernet-wiring/
Sniper2 , 07-26-2024, 05:55 PM
well it is like this:Gb switch is on my PC and i have 100base ethernet on a non RJ45 conector and basicaly i need to leave the 2 not used pairs floating or terminate with proably 100 ohm
Sniper2 , 07-26-2024, 06:00 PM
PS i also have a SGMII unused do i need to terminate that somehow?
QDrives , 07-26-2024, 08:17 PM
Why have a 1Gbps phy if you can only do 100Mbps? Doesn't that make things more complicated?
Sniper2 , 07-26-2024, 08:53 PM
switch*
Sniper2 , 07-26-2024, 08:54 PM
some ports need to be GB and a few can only do 100base
QDrives , 07-27-2024, 07:36 PM
But is your connection / connector able to do so? Is your "non RJ45 connector" able to handle Gb?
Sniper2 , 07-27-2024, 08:53 PM
yes
Sniper2 , 07-27-2024, 08:53 PM
base100ethernet is no so picky
QDrives , 07-27-2024, 09:37 PM
If your device has Gb PHY and connector, you do the layout as if Gb.If you connect only a 100Mb cable, that does not make a difference.https://dgonzalez.net/papers/roc/stdwiring.png
Sniper2 , 07-27-2024, 09:46 PM
yes i did that
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