Comment Re:Not a 486 thing, but... (Score 1) 126
A modern Ethernet PHY already has to support multiple different encoding schemes, MLT-3 for 100BASE-TX and PAM-5 for 1000BASE-T (and PAM-64, etc for higher speeds like 2.5 or 10 gig.) Eliminating the Manchester encoding for 10BASE-T is a logical way to save on cost and complexity, especially since most companies probably don't have a lot of legacy 10 mbit only gear to test with.