Charter Communications, Inc. (Charter) provides cable services in the United States, offering a range of entertainment, information and communications solutions to residential and commercial customers. Its infrastructure consists of a hybrid fiber coaxial cable plant passing approximately 12 million homes, with 98% of homes passed at 550 megahertz or greater and 98% of plant miles two-way active. A national Internet protocol (IP) infrastructure interconnects Charter markets. During the year ended December 31, 2011, it generated 50% revenue from its residential video service. It sells its video, Internet and telephone services on a subscription basis, often in a bundle of two or more services, providing savings and convenience to its customers. Bundled services are available to approximately 97% of its homes passed, and approximately 62% of its customers subscribe to a bundle of services. In May 2013, Liberty Media Corp acquired a 27.38% stake in Charter Communications Inc.