A variation of CT1 that was primarily used in the United Kingdom. CT0 is an early standard for analog cordless telephony that specified eight paired channels, with the base station transmission in the 1.642 GHz-1.782 GHz range, and portable station transmission in the 47 MHz range. A number of parochial CT0 versions were developed in other countries. See also analog, channel, cordless telephone, and CT1.