Retronetworking

h1. 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 T/R 24-03_ and _I-ETS 300 235_ . The former is the original standard from 1984, 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 |