DECT - Revision history

R4002 at 18:26, 27 September 2024

2024-09-27T18:26:21Z

← Older revision		Revision as of 18:26, 27 September 2024
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-	[[Category: VHF/UHF Radio Services]]	+	[[Category:VHF/UHF Radio Services]]
	[[Category:Personal_Radio_Services]]		[[Category:Personal_Radio_Services]]
		+	[[Category:Transmission modes]]

R4002 at 13:19, 14 February 2024

2024-02-14T13:19:00Z

← Older revision		Revision as of 13:19, 14 February 2024
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	[[Category: VHF/UHF Radio Services]]		[[Category: VHF/UHF Radio Services]]
		+	[[Category:Personal_Radio_Services]]

R4002 at 11:05, 13 October 2022

2022-10-13T11:05:19Z

← Older revision		Revision as of 11:05, 13 October 2022
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	Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and other [[VHF_/_UHF_Radio\|VHF/UHF]]/SHF bands such as [[SRD860\|800 MHz band]], 890 MHz band, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.		Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and other [[VHF_/_UHF_Radio\|VHF/UHF]]/SHF bands such as [[SRD860\|800 MHz band]], 890 MHz band, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.
		+
		+	Usually known by the acronym '''DECT''', or, in the United States, DECT 6.0, is a standard primarily used for creating [[cordless telephone]] systems. It originated in Europe and is now used worldwide (with frequency allocations differing from country to country...however, there are significant efforts at standardization as with LPD or [[Part 15]] devices in the EU (CEPT), etc.
		+
		+	DECT based systems may be used for full duplex intercom systems, on-site VoIP PBX type systems ePBX systems, multi-site cordless phone with handset to handset communications capability, paging, etc. There are similar multi-site long range business cordless phone systems (VoIP based, traditional PBX hardline based) on the market, including systems on the 900 MHz band that offer significant range improvement (using multiple base stations and high gain antennas, creating a private cellular telephone network for a large office building complex, retail store, warehouse or other facilities. Many of these systems blur the line between two-way radio, cordless telephone systems, intercoms and traditional business phone systems.

	==Background==		==Background==

R4002: /* Background */

2022-10-13T10:58:50Z

Background

← Older revision		Revision as of 10:58, 13 October 2022
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	Digital enhanced cordless telecommunications		Digital enhanced cordless telecommunications
	Modulation: TDMA, GMSK, GFSK		Modulation: TDMA, GMSK, GFSK
-	Combination method. DECT uses MC (multi carrier): 10 RF channels; channel 10 at 1881.792 MHz; other channel numbers in decreasing order at 1.782 MHz intervals. DECT uses TDMA (time division multiple access) within a channel: 24 timeslots spaced 10 ms apart; 1 – 12 downlink, 13 – 24 uplink. DECT devices automatically look for the carrier that gives the best transmission quality (dynamic channel selection / allocation). DECT uses TDD (time division duplex) In full duplex mode for telephony in 2 channels always separated by 5 ms and also on different frequencies. The bursts are GMSK or GFSK modulated (Gaussian minimum shift keying; Gaussian frequency shift keying). Up to 23 channels can be bundled for data transmissions. At least one channel must remain for the backward path	+	Combination method. DECT uses MC (multi carrier): 10 RF channels; channel 10 at 1881.792 MHz; other channel numbers in decreasing order at 1.782 MHz intervals. DECT uses TDMA (time division multiple access) within a channel: 24 timeslots spaced 10 ms apart; 1 – 12 downlink, 13 – 24 uplink. DECT devices automatically look for the carrier that gives the best transmission quality (dynamic channel selection / allocation). DECT uses TDD (time division duplex) In full duplex mode for telephony in 2 channels always separated by 5 ms and also on different frequencies.
-		+
-		+
-	usually known by the acronym '''DECT''', or, in the United States, DECT 6.0, is a standard primarily used for creating [[cordless telephone]] systems. It originated in Europe and is now used worldwide (with frequency allocations differing from country to country...however, there are significant efforts at standardization as with LPD or [[Part 15]] devices in the EU (CEPT), etc.	+

	==Frequencies==		==Frequencies==

R4002: /* Frequencies */

2022-07-25T14:04:23Z

Frequencies

← Older revision		Revision as of 14:04, 25 July 2022
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	1770 MHz to 1939 MHz with obvious gaps depending on country allocation. Usually the 1.9 GHz band. This frequency space is valuable and in many areas may be allocated to other services such as 4G mobile cellular, 4G LTE mobile systems or 5G cellular systems.		1770 MHz to 1939 MHz with obvious gaps depending on country allocation. Usually the 1.9 GHz band. This frequency space is valuable and in many areas may be allocated to other services such as 4G mobile cellular, 4G LTE mobile systems or 5G cellular systems.

-	Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.	+	Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary considerably from country to country.

	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0 - Unlicensed Personal Communications Service or UPCS, [[Part 15]] Subpart D ([[Part_15#Part_15_Subpart_D_-_Unlicensed_Personal_Communications_Services_UPCS_DECT_1920-1930_MHz_Band\|15.301 through 15.323]])		*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0 - Unlicensed Personal Communications Service or UPCS, [[Part 15]] Subpart D ([[Part_15#Part_15_Subpart_D_-_Unlicensed_Personal_Communications_Services_UPCS_DECT_1920-1930_MHz_Band\|15.301 through 15.323]])

R4002: /* Frequencies */

2022-07-25T13:30:38Z

Frequencies

← Older revision		Revision as of 13:30, 25 July 2022
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	Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.		Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.

-	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0 - Unlicensed Personal Communications Service or UPCS, [[Part 15]] Subpart D (15.301 through 15.323)	+	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0 - Unlicensed Personal Communications Service or UPCS, [[Part 15]] Subpart D ([[Part_15#Part_15_Subpart_D_-_Unlicensed_Personal_Communications_Services_UPCS_DECT_1920-1930_MHz_Band\|15.301 through 15.323]])

	*1910 MHz - 1930 MHz - Latin America (excluding Brazil)		*1910 MHz - 1930 MHz - Latin America (excluding Brazil)

R4002: /* Frequencies */

2022-07-25T13:24:25Z

Frequencies

← Older revision		Revision as of 13:24, 25 July 2022
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	Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.		Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.

-	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0	+	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0 - Unlicensed Personal Communications Service or UPCS, [[Part 15]] Subpart D (15.301 through 15.323)
		+
	*1910 MHz - 1930 MHz - Latin America (excluding Brazil)		*1910 MHz - 1930 MHz - Latin America (excluding Brazil)
	*1910 MHz - 1920 MHz - Brazil		*1910 MHz - 1920 MHz - Brazil

R4002: /* Frequencies */

2022-05-18T15:12:52Z

Frequencies

← Older revision		Revision as of 15:12, 18 May 2022
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	DECT bands DECT frequency bands DECT channels		DECT bands DECT frequency bands DECT channels

-	Full coverage usually considered ~~1770 MHz to 1939 MHz with obvious gaps depending on country allocation. Usually~~ the 1.9 GHz ~~band~~.	+	Full coverage usually considered roughly the 1.7 GHz to 1.9 GHz bands, but this varies significantly from country to country.

-	Channel spacing is usually 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.	+	1770 MHz to 1939 MHz with obvious gaps depending on country allocation. Usually the 1.9 GHz band. This frequency space is valuable and in many areas may be allocated to other services such as 4G mobile cellular, 4G LTE mobile systems or 5G cellular systems.
		+
		+	Channel spacing is ''usually'' 1.728 MHz, with some exceptions and offsets. Power limits, duty cycle limitations and ERP/EIRP limits also vary from country to country.

	*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0		*1920 MHz - 1930 MHz - United States and Canada - DECT 6.0

R4002 at 17:45, 21 April 2022

2022-04-21T17:45:42Z

← Older revision		Revision as of 17:45, 21 April 2022
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-	Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and other [[VHF_/_UHF_Radio\|VHF/UHF]]/SHF bands such as 890 MHz, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.	+	Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and other [[VHF_/_UHF_Radio\|VHF/UHF]]/SHF bands such as [[SRD860\|800 MHz band]], 890 MHz band, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.

	==Background==		==Background==

R4002 at 17:44, 21 April 2022

2022-04-21T17:44:58Z

← Older revision		Revision as of 17:44, 21 April 2022
Line 2:		Line 2:


-	Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and [[UHF]]/SHF bands such as 890 MHz, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.	+	Originally designed as a [[Cordless_telephone\|cordless telephone]] standard to replace the half dozen different analog and digital cordless telephone technologies operating on various frequency bands from 1.6-1.7 MHz to 30-50 MHz ([[Cordless_telephone#United_Kingdom\|30 MHz and 31 MHz band paired with the and 39 MHz and 40 MHz band, 1.610-1.8 MHz paired with 47 MHz VHF]]) in the UK, 43-50 MHz in the US) and other [[VHF_/_UHF_Radio\|VHF/UHF]]/SHF bands such as 890 MHz, 900 MHz band ([[Part_15#15.247_-_Operation_within_the_bands_902-928_MHz.2C_2400-2483.5_MHz.2C_and_5725-5850_MHz.\|902-928 MHz]]), the 2.4 GHz band 5 GHz band and 5.8 GHz bands among many others.

	==Background==		==Background==