Jackson received a four-game suspension as a rookie last season for the same reason. This suspension is for eight games because it's his second violation.
Coach John Harbaugh said during a Friday news conference that Jackson is "getting what he deserves."
"You've got to follow the rules. You don't follow the rules, you get suspended," Harbaugh said. "That's a fair rule. There's really no place for that."
Harbaugh said "time will tell" if the defensive back will still be with the team following the suspension.
Drafted in the fifth round out of Cal Poly, Jackson played in only two games last season for the Super Bowl champions.
Jackson will be eligible to return to the active roster Nov. 4 after the team's game against Cleveland on Nov. 3. He is eligible to participate in all preseason practices and games.
The Associated Press contributed to this report.