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WIMPy, 03/21/2024 04:20 PM
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 |
Updated by WIMPy about 1 month ago · 1 revisions