Cablevision Systems is planning a public offering of $500 million in debt due in 10 years, with the proceeds used largely to pay off notes coming due sooner.

Cablevision said it will address its upcoming debt maturities by making tender offers for $400 million of its 8.5 percent Senior Notes due 2015 and 8.5 percent Senior Notes due 2014, repaying $100 million of its Term Loan B-2 and for general corporate purposes.

The senior notes are being offered pursuant to the company's existing shelf registration statement, which became automatically effective upon filing with the Securities and Exchange Commission, the company said. A preliminary prospectus supplement and accompanying prospectus describing the terms of the offering will be filed with the SEC. BofA Merrill Lynch will act as one of the joint book-runners for the offering.