Ethernet link voltages

[YLearn]

Somewhere in the distant nuances of my mind, I seem to remember reading something that said 10/half ethernet connections used a slightly higher voltage than 100/full connections. I know this can be true with differences in serial connections, but I can't seem to track this down anywhere for ethernet on the web and I can't parse the IEEE standard for all the electrical specifications.

Anyone know off hand?

 

[Frank4d]

From IEEE-802.3-2002:

The peak differential voltage on the TD circuit when terminated with a 100 ? resistive load shall be between
2.2 V and 2.8 V for all data sequences. When the DO circuit is driven by an all-ones Manchester-encoded
signal, any harmonic measured on the TD circuit shall be at least 27 dB below the fundamental.The peak differential voltage on the TD circuit when terminated with a 100 ? resistive load shall be between 2.2 V and 2.8 V for all data sequences.

I did not find anything that suggests the voltage should be different depending on whether full or half duplex.