It's unclear what Brown did to violate the conduct policy.
"While I do not agree with the suspension, I will accept it," Brown said in a statement. "I have exhausted the appeals process and have no other options along those lines. I will continue to work hard for this team, and I have tremendous confidence in my teammates and in my ability to move on and contribute to the team."
Added coach Ben McAdoo: "We have been supportive of Josh and will continue to be, but we accept the league's decision."