Difference between revisions of "Global System for Mobile Communications"

From ForensicsWiki
Jump to: navigation, search
m
Line 1: Line 1:
The '''Global Systems for Mobile Communications''' ('''GSM'''), is a radio-based technology that allows [[mobile phones]] to communicate. GSM is considered to be the world's most ubiquitous radio-based cellular technology, with 1.7 billion users as of March 2006. In the United States, carriers such as [[T-Mobile]] and [[Cingular]] utilize GSM technology for their cellular networks.
+
Man shot dead at vehicle checkpoint
 
+
A man has been shot dead by police at a vehicle checkpoint in Northern Ireland. Officers fired a number of rounds during the incident on Church Street in Ballynahinch, County Down. The man shot dead was the
= GSM Cell Phone Providers =
+
 
+
== USA ==
+
 
+
* [[Cingular]]
+
* [[T-Mobile]]
+
 
+
== Other ==
+
 
+
* [[T-Mobile]]
+
* [[Vodafone]]
+
* [[O2]]
+
 
+
= Operational Characteristics =
+
 
+
== Network Principles ==
+
 
+
GSM is considered to be 2G and uses digital data for both signaling and voice purposes. GSM uses a time division multiple access ([[TDMA]]) protocol to transmit information. Aside from voice, [[GPRS]] and [[EDGE]] allow for data transmissions across a GSM network.
+
 
+
== Radio Communication ==
+
 
+
In terms of frequencies used, GSM networks often use the 900MHz and 1800MHz bands, but carriers in the United States use 850MHz and 1900MHz bands. As a result, "dual-band" phones, which only support two of the four major bands, can only be used in certain parts of the world. More common are "tri-band" phones, which usually operate on 900/1800MHz and 1900MHz. "Quad-band" phones support all four frequencies and can be used in all parts of the world.
+
 
+
== Security and Encryption ==
+
 
+
* [[SIM Card]]
+
* [[Security Standards]]
+
* [[Authentication Standards]]
+
 
+
== GSM Forensics ==
+
 
+
* [[Phone with SIM Card]]
+
* [[Phone without SIM Card]]
+
* [[SIM Card]]
+
 
+
== External Links ==
+
 
+
* [http://www.gsmworld.com/index.shtml GSM World]
+

Revision as of 08:45, 16 April 2006

Man shot dead at vehicle checkpoint A man has been shot dead by police at a vehicle checkpoint in Northern Ireland. Officers fired a number of rounds during the incident on Church Street in Ballynahinch, County Down. The man shot dead was the