New York Attorney General Eric Schneiderman has launched an investigation into Verizon, Cablevision and Time Warner Cable. The purpose of the probe is to determine whether three of the state’s top telecom companies are providing high-speed broadband Internet as advertised to consumers and businesses. The AG last week sent the companies’ CEOs letters seeking documents and answers to specific questions about whether there is a divergence between the advertised speeds for broadband Internet and the actual speeds delivered to customers.