Dixon was cut earlier this month from the Ravens' practice squad.
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Under the NFL collective bargaining agreement, though, Dixon had been on the active list for fewer than nine regular-season games and that qualified him for the practice squad.
"I didn't know I was eligible for the practice squad," Dixon said earlier this season. "There aren't many opportunies, so I grabbed the first one that came. I'm glad I'm here."
During the Steelers' 20-17 loss in Baltimore in 2009, Dixon completed 12 of 26 passes for one passing touchdown, one rushing touchdown and one interception as he was picked off by Paul Kruger.
Dixon had been out of a job the entire offseason after playing in no games last season for the Steelers.
The former Oregon standout initially tried out for the Ravens last spring when they auditioned him, former Baltimore starter Kyle Boller and Curtis Painter. Painter was signed and then cut during the final major roster cutdown.
"Everybody has bumps and bruises in their career," Dixon said. "You've got to take that into consideration and take the positives from it and grow from there. I"m starting over at the bottom and working my way up."
Dixon is one of the rare players to play for both franchises.
"There's a lot of bad blood around both sides and a lot of respect, too," Dixon said. "It's always so cutthroat. It's always a grind. I still have a lot of close friends in Pittsburgh, but now I'm on the other side."