The group that represents most Maryland state police is challenging the settlement of a discrimination suit filed by black troopers, saying it violates other troopers' rights by requiring black promotions.

In papers filed Friday in U.S. District Court in Baltimore, the predominantly white Maryland Troopers Association said settlement of the $45 million lawsuit is unconstitutional because it outlines a five-year timetable for increasing black representation in ranks up through lieutenant colonel. The troopers association represents more than 1,700 current and retired state troopers.

The settlement, the product of more than five years of talks between lawyers for the state and the Coalition of Black Maryland State Troopers Inc., outlines $900,000 in cash settlements and names seven black troopers who will be promoted one rank. The troopers association is not challenging the cash settlements or the promotions, but it is asking the court to throw out what it termed racial quotas for promotions.

The state police force is 84 percent white. The highest-ranking blacks are two captains.

Emory A. Plitt Jr., an assistant attorney general representing the state police, and David L. Moore, attorney for the black troopers group, have said the settlement outlines flexible goals, not quotas.