I am having trouble finding an Ethernet PHY that specifically advertises as being compliant with 1000Base-KX (to be sent over a VXP backplane, a single RX pair and a single TX pair).
I found a comment here: Connecting two Ethernet PHY without magnetics?
That says you can put most modern PHYs into a 1000BASE-KX mode by doing some configuration bit tweaks. Can anybody elaborate on which bits would need to be changed, and how? Is this using a standard 1000BASE-T PHY?
Best Answer
No relation with 1000BASE-T.
It's the 1000BASE-X encoding, found in optical fibre links 1000BASE-SX and 1000BASE-LX, but used in backplanes.
There is also 1000BASE-CX for short links over special cables.
It's described in the 802.3 standard (freely downloadable)
Optical interfaces are often connected through removable SFP adapters, the signals that drive these modules are quite similar to 1000BASE-KX. Some Ethernet PHYs supporting optical links are compatible with -KX.