AT&T Inc sought to clarify to U.S. regulators its plans to pause investments in high-speed Internet connections until "net neutrality" rules are settled, saying in a letter on Wednesday that the plans related to new and not existing commitments. The Federal Communications Commission earlier this month pressed the company to explain its plans to stop investing in high-speed Internet connections in 100 cities until the agency sorts out new "net neutrality" rules for how Internet service providers manage web traffic on their networks.