According to all reference schematics referring W5500 there are series caps in RXP and RXN path.
C9, C10 in
Are they mandatory for W5500?
I have to make a design which has to be compatible to a coupling device plugged into a 100 BASE-TX link. The schematic could be said as this:
The cable length from and to the device will not exceed 1.5 m and the caps within the coupling device are 4.7nF and cannot be changed.
I already figured out that if I shorten the caps I’m able to establish a link with a few devices.
For testing I have a Netgear FS108 and a FS108P, the last one contains PoE. A link is established with the 108P Switch but not with the 108 one.
My circuit is not using PoE at all.
If I double the caps within the coupling device (only allowed for testing purpose) there is a link, and data transfer, with both types of switches.
So to sum up the question(s).
Are the series caps mandatory?
Can someone imagine of a way to increase compatibility to switches?
Thanks in advance