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	Latest News

	Worlds smallest UMTS module UC864 and CDMA module CC864-Dual
	Tiny antennas – aerials for smallest and low cost applications
	Batteries, Microphones and Loudspeakers especially designed for your wireless applications
	Ordering Information
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	Contact

	Round Solutions Ltd. Regent House Business Centre 24-25 Knutford Place Marble Arch London W1H5YN UK Sales inquiries: Tel +44 (0) 207 569-3210 Fax +44 (0) 207 569-3001 e-mail
	Round Solutions GmbH & Co KG Im Steingrund 3 63303 Dreieich Germany Deutsch: Tel +49 6103 270440 English: Tel +49 6103 27044200 Fax +49 6103 27044199 e-mail
	Round Solutions Nordics B Ved Klaedebo 18 DK-2970 Hörsholm Denmark Tel: +45 (0)36 96 73 95 Tel: +49 6103 27044 122 Fax: +49 6103 27044 199 Kundtjänst på Svenska: Tel +49 6103 27044210 e-mail
	Round Solutions Italy Parliamo italiano Tel +49 6103 27044220 Fax +49 6103 27044199 e-mail
	Round Solutions Spain - South America Hablamos el espanol Tel +49 6103 27044230 Fax +49 6103 27044199 e-mail

Basic Knowledge

Q: What is GSM ?

GSM (Global System for Mobile communication) is a digital mobile telephone system that is widely used in Europe and other parts of the world. GSM uses a variation of Time Division Multiple Access (TDMA) and is the most widely used of the three digital wireless telephone technologies (TDMA, GSM, and CDMA). GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. It operates at either the 900 MHz or 1,800 MHz frequency band.

GSM is the de facto wireless telephone standard in Europe. GSM has over one billion users worldwide and is available in 190 countries. Since many GSM network operators have roaming agreements with foreign operators, users can often continue to use their mobile phones when they travel to other countries.

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