Slowest internet connection service is

ISDN stands for integrated services digital network. It still requires dialing up to a server to connect to the internet. It is meant for sending voice, video and information through analog and digital phone lines. The speeds of this are a little faster at 64 Kbps to 128 Kbps. ISDN is available in about 90 percent of the United States, making it an option for more people to connect to the Internet.