Telepoint

CT2 is a cordless telephony standard that was used in the early 1990s to provide short-range proto-mobile phone service in some countries in Europe. It is considered the precursor to the more successful DECT system. CT2 was also referred to by its marketing name, Telepoint.

CT2 is a digital FDMA system that uses Time Division Duplexing technology to share carrier frequencies between handsets and base stations. Features of the system are:

Unlike DECT, CT2 was a voice-only system, though like any minimally-compressed voice system, users could deploy analog modems to transfer data. In the early nineties, Apple Computer sold a CT2 modem called the PowerBop to make use of France's Bibop CT2 network. Although CT2 is a microcellular system, fully capable of supporting handoff, unlike DECT it does not support "forward handoff", meaning that it has to drop its former radio link before establishing the subsequent one, leading to a sub-second dropout in the call during the handover.

CT2 was deployed in a number of countries, including Britain and France. In Britain, the Ferranti Zonephone system was the first public network to go live in 1989, and the much larger Rabbit network operated from 1992 to 1993. In France, the Bi-Bop network ran from 1991 to 1997. In the Netherlands Dutch incumbent PTT deployed a CT2 based network called Greenpoint from 1992 to 1999. The first year it used the name and mascot Kermit but royalties proved prohibitly large and the mascot was dropped the following years. The service continued under the brand name Greenhopper. During successful years there were over 60000 Greenpoint subscribers. In Finland, the Pointer service was available for a short time in the 1980s before being superseded by Nordic Mobile Telephone (NMT). Outside of Europe, the system achieved a certain amount of popularity in Hong Kong with three operators offering service until licenses were terminated in 1996. Since 31 December 2008, CTA1 and CTA2 based phones are forbidden in Germany.

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