-- Standard&Poor's affirmed its 'B+' corporate credit rating on regional cable TV provider Atlantic Broadband. -- We also assigned 'BB-' issue-level and '2' recovery ratings to Atlantic's proposed new revolver and term loan B which are being issued under the existing senior secured credit facility. -- We are raising the issue level rating on the existing revolver and term loan B to 'BB-' from 'B+'. -- The outlook is stable, based on our 2009 expectations for leverage declining modestly to the mid-5x range and meaningfully free cash flow in the year. NEW YORK (Standard&Poor's) May 28, 2009--Standard&Poor's Ratings Services said today it affirmed the 'B+' corporate credit rating on Quincy, Mass.-based regional cable TV