ISO/IEC 29341-8-19:2008(E) models physical and link layer properties specific to a Plain Old Telephone System (POTS) modem used for Internet access on an Internet Gateway Device. The series of ISO/IEC 29341 publications defines an architecture for pervasive peer-to-peer network connectivity of intelligent appliances, wireless devices and PCs. It is designed to bring easy to use, flexible, standards-based connectivity to ad-hoc or unmanaged networks whether in the home, in a small business, public spaces or attached to the Internet.