Cordless Telephony » History » Revision 4
Revision 3 (eloy, 03/22/2024 04:11 PM) → Revision 4/10 (eloy, 03/22/2024 04:36 PM)
h1. Cordless Telephony Over the years several standards for cordless telephones have come and gone: | Name | Year | Frequencies | Info | | CT1 | 1984 | 40 ch @25kHz UL 914–915 MHz DL 959–960 MHz overlaps GSM channels 120-124 | Analog CEPT standard. Operation no longer allowed since 1998 in Germany / 2005 in Austria | | CT1+ | | 80 ch @25kHz UL 885–887 MHz DL 930–932 MHz | Used in Belgium, Germany, Luxembourg and Switzerland Operation no longer allowed since 2008 in Germany | | [[CT2]] | 1985 | 864–868 MHz | British standard MPT1375, later adopted by other countries Operation no longer allowed since 2008 in Germany | | CT3 | | | Only available as prototype, first presented at a CEPT conference Practically abandoned in Lund, 1987. Became the basis for DECT. (source: favor of DECT Today, May 2016) | | DECT | 1992 | 10 ch @1728 kHz * 24 timeslots 1880–1900 MHz 1900–1980 MHz optional 2010–2025 MHz optional 2400–2480 MHz optional 1920–1930 MHz USA | Originally _Digital European Cordless Telephony_, later _Digital Enhanced Cordless Telecommunications_ Digital standard using G.726 as voice CODEC DECT only defines the radio interface. Later DECT-GAP (Generic Access Profile) specified basic functions (call setup / tear-down) ensuring interoperability between vendors | | CAT-iq | 2006 | see DECT | _Cordless Advanced Technology – internet and quality_ Superset of DECT ensuring more interoperability and adding G.722 as mandatory voice CODEC |
