= GSM =

[http://www.heliostelecom.com/eproducts_detail.asp?id=105 GSM] dates to the 1980s, when analog cellular systems in Nordic countries experienced rapid growth 
that resulted in the development of a new digital cellular standard. After five years of effort, 13 network operators and administrators signed a charter for 
the standardization of GSM. At that time, GSM was referred to by its French name, Group Special Mobile, but it is now known on a worldwide basis as Global 
System for Mobile Communications.

The European version of GSM operates in the [http://www.heliostelecom.com/eproducts_detail.asp?id=105 900MHz band], which was avilable in countries that are 
members of the European commission. Unfortunately, the 900MHz band in the United States was not available, so the 
[http://www.heliostelecom.com/eproducts_detail.asp?id=105 1900MHz band] is used by GSM personal communications system in the United States.

GSM represents a TDMA version of [http://www.heliostelecom.com/eproducts_detail.asp?id=105 PCS]. As a digital technology, voice is first compressed using a 
hybrid coder at approximately 13kps before the data is modulated. With this digital technolgy, you can connect a data source directly to a GSM cell phone 
without the use of a modem. However, the highest data rate that you can expect to obtain will be approximately 14.4kbps.

Website: http://www.heliostelecom.com
Company Name: Xiamen Helios Telecom Equipment Manufacture Inc.
Department: Network Optimization Department

Tags: [http://www.heliostelecom.com/eproducts_detail.asp?id=105 RF Repeater] | [http://www.heliostelecom.com/eproducts_detail.asp?id=105 GSM Repeater] | 
[http://www.heliostelecom.com/eproducts_detail.asp?id=105 CDMA Repeater] | [http://www.heliostelecom.com/eproducts_detail.asp?id=105 UMTS Repeater] | 
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