Cordless Telephony

Over the years several standards for cordless telephones have come and gone:

Name Year Frequencies Info
CT0 N/A N/A Retronym for non-standardized earlier versions
CT1 1984 40 ch @25kHz
UL 914–915 MHz
DL 959–960 MHz
overlaps GSM channels 120-124
Analog CEPT standard, specified in CEPT Recommendation-TR-24-03.PDF and I-ETS 300 235 . The former is the original standard from 1983, the latter is an updated version from ETSI released in 1994 which contains some updates.
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 in Lund, 1987. Became the basis for DECT. (source: 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
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Updated by eloy 11 days ago · 10 revisions

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