'Other backup' Carr happy to be a Giant

For some reason, the Giants aren't getting as much attention for signing a backup quarterback as other teams have this week.

David Carr, who already had agreed to terms with the Giants, swung by the Timex Performance Center Thursday for a physical and to ink his one-year deal to be Eli Manning's backup. It's a thankless job because Manning plays all the time -- he's never missed a game as a starter and Carr, 32, has appeared in only nine games with no starts in three years with the Giants -- but Carr seems to enjoy the work. And his teammates.

"You play ball in high school, you play ball in college, and there's really not a better locker room that I've been in," Carr said. "It's a great environment . . . No one takes themselves too seriously, and with all the egos and all the good football players, you'd think that would be a problem. But there's really not that issue in this locker room."

Carr, who didn't play a snap in 2011, also likes the offensive system that the Giants employ . . . even though he hardly gets to use it in games.

"It's just natural for me," Carr said. "I feel really comfortable in it . . . I know that if given the opportunity and put in the position to play on this team, I would do well. That's also a comforting feeling knowing that if you get into the game, you're in there, first of all, with the world champions, so how can you go wrong? And secondly, to know that you're going to go out there and succeed is also a positive."

Notes & quotes: WR Mario Manningham signed his two-year deal with the 49ers and said that although he thought there was a chance Peyton Manning would end up in San Francisco with him, that wasn't the reason he chose the 49ers. "I feel like I can come here and make an impact and be a great addition to this offense," he said. He also said he was disappointed the Giants didn't make more of an effort to re-sign him. "That's me knowing the business part of this system about football," he said. "Yeah, you know, who wouldn't want to come back to their team that was there? But I'm not, and that was in the past." . . . Free-agent CB Aaron Ross was introduced in Jacksonville, where he signed a three-year deal. "I love that organization," he said of the Giants, with whom he won two Super Bowls. "They started my career off . . . I have no regrets at all. At the end of the day, it comes down to a business and your family." . . . Stanford tight end Coby Fleener ran a 4.45 40-yard dash at his pro day Thursday. Among those watching was Giants tight ends coach Mike Pope.