Cordless Telephony » History » Revision 2
Revision 1 (WIMPy, 03/21/2024 04:20 PM) → Revision 2/10 (WIMPy, 03/21/2024 04:24 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]] | 1885 | 864–868 MHz | British standard MPT1375, later adopted by other countries
Operation no longer allowed since 2008 in Germany |
| CT3 | | | Practically abandoned in favor of DECT |
| 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 |
