Cordless Telephony » History » Version 1
WIMPy, 03/21/2024 04:20 PM
1 | 1 | WIMPy | h1. Cordless Telephony |
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3 | Over the years several standards for cordless telephones have come and gone: |
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5 | | Name | Year | Frequencies | Info | |
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6 | | CT1 | 1984 | 40 ch @25kHz |
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7 | UL 914–915 MHz |
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8 | DL 959–960 MHz |
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9 | overlaps GSM channels 120-124 | Analog CEPT standard. |
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10 | Operation no longer allowed since 1998 in Germany / 2005 in Austria | |
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11 | | CT1+ | | 80 ch @25kHz |
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12 | UL 885–887 MHz |
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13 | DL 930–932 MHz | Used in Belgium, Germany, Luxembourg and Switzerland |
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14 | Operation no longer allowed since 2008 in Germany | |
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15 | | [[CT2]] | 1885 | 864–868 MHz | British standard MPT1375, later adopted by other countries |
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16 | Operation no longer allowed since 2008 in Germany | |
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17 | | CT3 | | | Practically abandoned in favor of DECT | |
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18 | | DECT | 1992 | 10 ch @1728 kHz * 24 timeslots |
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19 | 1880–1900 MHz |
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20 | 1900–1980 MHz optional |
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21 | 2010–2025 MHz optional |
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22 | 2400–2480 MHz optional |
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23 | 1920–1930 MHz USA |
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24 | | Originally _Digital European Cordless Telephony_, later _Digital Enhanced Cordless Telecommunications_ |
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25 | Digital standard using G.726 as voice CODEC |
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26 | DECT only defines the radio interface. Later DECT-GAP (Generic Access Profile) specified basic functions (call setup / tear-down) ensuring interoperability between vendors | |
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27 | | CAT-iq | 2006 | see DECT | _Cordless Advanced Technology – internet and quality_ |
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28 | Superset of DECT ensuring more interoperability and adding G.722 as mandatory voice CODEC | |