Retronetworking

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, specified in I-ETS 300 235.

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 |