WASHINGTON (AP)—The Tennis Channel has filed a complaint with federal regulators accusing Comcast of discriminating against its programming.

The Tennis Channel alleges that Comcast isolates the network on a premium sports tier that reaches only a small fraction of subscribers, even as it carries Comcast-owned networks such as the Golf Channel and Versus on basic tiers that reach many more customers.

The Tennis Channel filed its complaint with the Federal Communications Commission on Tuesday. The company's chief executive, Ken Solomon, called the case ``a litmus test for unaffiliated programmers everywhere.''

Comcast Corp., the nation's largest cable company, says it fully honors the terms of its program carriage contract with the Tennis Channel.