The Panthers will receive a 2014 late-round draft choice for Beason.
"It's amazing," Beason told Giants.com. "It doesn't happen [often] with midseason trades, but the one place I said if I wasn't in Carolina where I wanted to be was with a great organization like the Giants with a winning tradition, leadership, a 4-3 scheme where I can come in right now. I think I can really come out and impact the season."
Beason was unsure if he'll play Sunday against the Philadelphia Eagles.
"I know I'll come in tomorrow early and meet the coaches, and I'll get my linebacker coach [Jim Herrmann] and we're going to cram," Beason told the website. "If they ask me to, I'll dress [Sunday] and I'll give everything I have. … It's just going to be terminology. I'm a smart player. I learn fast.
"Being a mike linebacker, a lot is on your plate. I think I actually thrive in that position. I'm going to get with coach as long as it takes and as fast as I can get it as soon as I want to play."
Beason was benched prior to Carolina's 38-0 Week 3 win against the Giants. He broached the topic of wanting to play more with Panthers coach Ron Rivera on Thursday.
"The trade benefits both the team and Jon," Rivera said Friday. "We'll obviously get something out of it, and it gives Jon an opportunity to get on the field."
The Giants (0-4) rank 22nd in the league in total defense and 28th against the rush.
Whether Beason can help remains a question. His play was a liability as Carolina (1-2) lost its first two games. In the opener, he missed a fourth-quarter tackle that resulted in the Seattle Seahawks getting out of a hole and running out the clock in a 12-7 win. A week later, in a 24-23 last-second road loss against the Buffalo Bills, Beason gave up five catches for 112 yards, including a 45-yarder to Steve Johnson in which 35 yards came after the catch.
In his prime, Beason was one of the best in the league. He led the Panthers in tackles with 140 as a rookie in 2007 and was runner-up for the NFL Defensive Rookie of the Year award.
He made his first Pro Bowl in his second season, recording 138 tackles and three interceptions. He continued at that pace until 2011, when his season ended early with the torn left Achilles tendon.
Beason has played in just seven games since.
"In this league or in this business, injuries are like being late to work," Beason told Giants.com. "That's how I try to describe it to people. It's only a matter of time before it happens. You hate it, but you deal with it and you go through it, but I know who I am and I know what I'm capable of."
Giants wideout Louis Murphy, a teammate of Beason's last year, was happy to hear he was coming aboard.
"Intense guy. He's a leader, a captain," Murphy said. "Just a tough player. Real tough player. Great teammate. He's a great guy, great leader. Just a good person, good person to be around. Good person to have on our team."
This is the second time within a span of two years that the Giants have dealt a late-round pick to acquire an injury-prone former first-round linebacker. The Giants sent a fifth-round pick to Cincinnati in 2012 for Keith Rivers, who has failed to be a difference-maker for the team. He played in just 11 games in 2012 and has eight tackles through four games this season.
Beason will have the chance to compete for quality minutes on a defense that lacks playmakers at linebacker. Mark Herzlich is the starting middle linebacker because of Dan Connor's season-ending injury, and backup Allen Bradford was claimed off waivers in September. Rivers has been ineffective. Spencer Paysinger has seemingly played the best of the unit.
Information from ESPN.com's Dan Graziano and David Newton, ESPNNewYork.com's Matt Ehalt and The Associated Press was used in this report.