Am Wed, Feb 12, 2025 at 01:38:13PM +0000 schrieb Russell King (Oracle): > On Tue, Feb 11, 2025 at 09:33:47AM +0100, Dimitri Fedrau via B4 Relay wrote: > > @@ -232,6 +232,12 @@ properties: > > PHY's that have configurable TX internal delays. If this property is > > present then the PHY applies the TX delay. > > > > + tx-amplitude-100base-tx-percent: > > + description: > > + Transmit amplitude gain applied for 100BASE-TX. When omitted, the PHYs > > + default will be left as is. > > + default: 100 > > + > > This should mention what the reference is - so 100% is 100% of what (it > would be the 802.3 specified 100BASE-TX level, but it should make that > clear.) > Yes, will add that to the description. 100% should match 2V peak to peak. > I'm having a hard time trying to find its specification in 802.3, so > maybe a reference to where it can be found would be useful, otherwise > it's unclear what one gets for "100%". > Compliance testing was done as described in: https://download.tek.com/document/61W_17381_3.pdf Didn't find the specification regarding the amplitude in 802.3, but according to the document above it should then be part of ANSI X3.263. Unfortunately I don't have access to ANSI X3.263, so I have to rely on the information in the document above. Best regards, Dimitri Fedrau
