 In his first year , the defense was ranked second overall in the NFL and second in rushing yards allowed . By his second year , in 2000 , the Ravens ' defense set NFL records for fewest points allowed and fewest rushing yards allowed . The defense allowed a combined 23 points in four playoff games en route to a Super Bowl XXXV victory , Ryan 's only Super Bowl ring . The defense consistently performed well in the following years . As a result , Ryan was promoted to defensive coordinator in 2005 following the departure of Mike Nolan , who became the head coach of the San Francisco 49ers . In 2006 , Ryan received Assistant Coach of the Year awards from Pro Football Weekly and the Pro Football Writers Association . 
