Fairfax Telecommunications Co., which lost a bitter cable television franchising contest last summer, filed additional claims in a Northern Virginia court yesterday, alleging that Fairfax County officials discriminated against the company during the selection process.

The firm's amended lawsuit is an effort to renew its legal battle against the Fairfax Board of Supervisors over the award of the franchise to Media General Cable of Fairfax County Inc. A Fairfax Circuit Court judge said two weeks ago he would dismiss Fairfax Telecommunications' initial suit unless the company could produce specific evidence to support its allegations of discrimination.

In court documents filed before Judge F. Bruce Bach yesterday, Fairfax Telecommunications charged that county employes heading the cable selection process engaged in "deliberate misrepresentations of the contents and merits of the two competing bids in communications to the Board of Supervisors."

County officials have denied that they gave Media General any unfair advantages in the selection process for the lucrative franchise. Media General, which also has denied any wrongdoing in the process, has begun construction of the multimillion-dollar cable system.

Fairfax Telecommunications officials alleged in the suit that the county allowed only Media General to effectively amend bid specifications after deadlines had passed. The suit also alleged that county officials distributed maps of the county showing proposed coverage under Media General's bid that were "based on outdated information."

County officials said yesterday they will contest the latest filing and will continue to seek dismissal of the lawsuit.

Media General and Fairfax Telecommunications were the only two bidders for the 15-year franchise, which a consultant estimated could be worth $260 million by the end of that period.