General Forum

Re: a question of frequency

marcus_m — Wed, 25 Jul 2007 01:50:14 GMT

Right, Gerd, this was also one of the documents I was refering to. Some years ago, I was working in the development department of a company building GSM mobile phones and DECT phones, so I'm absolutely sure my 8 year old DECT is using 1880-1900MHz. The ISM band at 2.4GHz is a concurrent frequency band (at least in Germany) and is used for WLAN, Bluetooth, DECT and other wireless transmissions. Therfore the availability of the band is not guaranteed and it is not a real time transmission any more.

I had a Beocom 6000 some years ago and this was attached to my Gigaset base via the GAP standard, so I suppose the BC6000 uses also 1880-1900MHz.

Keith, with the frequency range of the GSM phones I fully agree with you. DECT is the reason why GSM1900 isn't used in europe.

Marcus

Re: a question of frequency

Gerd — Tue, 24 Jul 2007 16:39:39 GMT

Interesting thread, and I'm a little bit confused now

It seems that DECT uses different frequency ranges. According to chapter 2 in this PDF (1,5MB) the spectrum allocation in european (and most other) countries is 1880-1900MHz. In the US and Canada DECT may since May 2002 be implemented in the 902-928 MHz, 2400-2483.5 MHz and 5725-5850 MHz (ISM) bands.

What is the standard in B&O Phones now? DECT or DECT@ISM?

Re: a question of frequency

Keith Saunders — Tue, 24 Jul 2007 15:14:35 GMT

Marcus,

Yes, I am sure. Like Germany, the UK uses GSM900 and GSM 1800 and the USA uses GSM1900 for GSM mobile phones, hence my comment about tri-band phones. When I travel to the US I can use the same tri-band as I use in the UK.

However the question related to DECT which is 2.4 Ghz

Re: a question of frequency

marcus_m — Tue, 24 Jul 2007 14:10:43 GMT

Keith Saunders:
Actually DECT transmission frequency is 2.4 GHz everywhere and is not 1900 Mhz as previously stated. 1900 Mhz is the frequency assigned to US GSM mobile phones. If you have a tri-band mobile phone it uses frequencies 900 Mhz, 1800 Mhz and 1900 Mhz
This frequency band is also used for such thing as wireless routers except in the US it is split into 11 channels and in Europe it uses 13 channels

Are you sure, Keith? Have a look at http://www.elektrosmog.de/Frequenzplan.htm there you can see the frequency-plan of Germany. You will see that there is only one frequency range for DECT: 1880-1900MHz. The range from 5725 to 5825 is reserved for DECT2.

2.400 - 2.4835 GHz is reserved for WLAN, 2.402 - 2.480 GHz for Bluetooth. In Germany only GSM900 and GSM1800 are used, the GSM1800 has a range from 1710 - 1880 MHz, so no problem with DECT.

Marcus

Re: a question of frequency

Gerd — Tue, 24 Jul 2007 12:52:56 GMT

According to his user profile he probably lives in the States or Canada (-5 GMT), thus the answer is 2,4GHz

Re: a question of frequency

Keith Saunders — Tue, 24 Jul 2007 12:52:18 GMT

Actually DECT transmission frequency is 2.4 GHz everywhere and is not 1900 Mhz as previously stated. 1900 Mhz is the frequency assigned to US GSM mobile phones. If you have a tri-band mobile phone it uses frequencies 900 Mhz, 1800 Mhz and 1900 Mhz

This frequency band is also used for such thing as wireless routers except in the US it is split into 11 channels and in Europe it uses 13 channels

Re: a question of frequency

joynsyde — Tue, 24 Jul 2007 10:33:59 GMT

Here in the 'States the BeoCom cordless phones use 2.4 GHz frequency digital transmission. I hear that phone specs vary from country to country. I'd call my local dealers and ask them to look it up for you, if the question is important in your decision-making process.

Re: a question fo frequency

marcus_m — Tue, 24 Jul 2007 02:35:38 GMT

These are DECT based phones, so they use 1900MHz (a little above or a little below dependent on the location - have a look at wikipedia for more details).

Marcus

a question fo frequency

Anonymous — Tue, 24 Jul 2007 01:51:21 GMT

Does anyone know what frequency the BeoLine and Handset's use to communicate.

I've looked through B&O literature but can't find anything.

Cheers

Jazz