Cable supplier CommScope ( CTV) warned Monday that it would miss fourth-quarter earnings estimates, hampered by rising costs and an unfavorable product mix. Shares in the Hickory, N.C., company slid 6% in after-hours trading on the company's guidance for the quarter ended Dec. 31. CommScope said fourth-quarter revenue would beat estimates, coming in at around $295 million, up from the previous $277 million view. But the company said it now expects to break even in the period, excluding restructuring charges. That news disappointed investors who had expected a 7-cent-a-share profit. "While our overall fourth-quarter revenue performance was stronger than expected, we are disappointed with our margin performance," finance chief Jearld Leonhardt said. "Our results were negatively affected by a number of items including higher-than-expected material and freight costs, an unfavorable product mix and higher period spending, among others." The company said it will release full fourth-quarter numbers and update 2005 guidance on Feb. 24. Late Monday, CommScope slipped 94 cents to $15.84.