Cisco 8831 conference phone and wireless DECT microphones

Started by Dieselboy, January 12, 2016, 02:02:31 AM

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Reggle

I'm pretty sure you're right. It will interfere I think. Marketing gone wild again?

wintermute000

#2
hate to be pedantic but depends. DECT actually isn't supposed to  be 2.4Ghz I believe, yet a lot of 'DECT' phones do operate on it and mess up wireless.


I'm no radio guy either (supposed to be doing CWNA before EOFY... stupid KPIs!!!) but I do believe that in real life although they are different frequencies, depending on the exact scenario, interference is still possible.

https://en.wikipedia.org/wiki/Digital_Enhanced_Cordless_Telecommunications

Frequency: Section 4.1.1 ("Nominal position of RF carriers") of the ETSI standard states: "DECT carriers are specified for the whole frequency range 1880 MHz to 1980 MHz and 2010 MHz to 2025 MHz. Carrier positions in the 902 MHz to 928 MHz ISM band and the 2400 MHz to 2483,5 MHz ISM band have been defined for the U.S. market. [...] The most common spectrum allocation is 1880 MHz to 1900 MHz, but outside Europe spectrum is also available in 1900 MHz to 1920 MHz and in 1910 MHz to 1930 MHz (several countries)."
1880 – 1900 MHz in Europe,
1880 – 1900 MHz in South Africa,
1880 – 1900 MHz in Hong Kong [7]
1900 – 1920 MHz in China, till 2003, after 2003 2.4 GHz
1893 – 1906 MHz in Japan,
1910 – 1930 MHz in Latin America,
1910 – 1920 MHz in Brazil, and
1920 – 1930 MHz in the United States and Canada
North-American DECT ("DECT 6.0") products may not be used in Europe and Africa, as they cause and suffer from interference with the European and South African cellular networks. Use of such products is prohibited by European Telecommunications Authorities and the Independent Communication Authority of South Africa. European DECT products may not be used in the United States and Canada, as they likewise cause and suffer from interference with American and Canadian cellular networks, and use is prohibited by the Federal Communication Commission and Industry Canada. As DECT and DECT 6.0 do not operate in the 2.4 GHz ISM band, they are not subject to, nor cause interference with, 802.11b and 802.11g Wi-Fi, and 2.4 GHz cordless phones. As such, they are sometimes marketed as 'WiFi friendly'.[8]

Dieselboy

Thanks for all the useful and helpful info here :)
(this is about the fourth time I've tried to post this. I got side tracked three times.