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DP83TD510E: Setting the transmit level to 1Vpp or 2.4Vpp

Part Number: DP83TD510E

Hello,

I want to control the 10BASE-T1L signal level (1Vpp or 2.4Vpp) but it is not clear to me how to set it.  I have tried changing straps and registers in various ways, but the signals I see on the oscilloscope are always the same. 

The signals vary roughly 5Vpp, see picture.  This makes me think it is transmitting at the 2.4Vpp level.  I tried using the 2.49K pull-up on strap 7 of both devices on either end of the link.  I believe this should force 1Vpp signaling, but the signals I see on the scope don't change. 

Ideally, I would like to set the signal level using the straps (rather than MDIO commands).  Can someone help me out with this?

Thanks,

Cyrus