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GSM
- Global System for Mobile Communications
Overview
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GSM (Global System for
Mobile Communications) is a European digital communications standard which
provides full duplex data traffic to any device fitted with GSM capability,
such as a phone, fax, or pager, at a rate of 9600 bps using the TDMA
communications scheme. Since GSM is purely digital, it can easily interface
with other digital communications systems, such as ISDN, and digital
devices, such as Group 3 facsimile machines. Unlike any other service, GSM
products such as cellular phones, require the use of a Subscriber Identity
Module, or SIM card. These small electronic devices are aproximatly the size
of a credit card and record all of the user information it. This includes
data such as programmed telephone numbers and network security features
which identify the user. Without this module, the device will not function.
This allows for greater security and also greater ease of use as this card
may be transported from one phone to another, while maintaining the same
information available to the user. GSM is also present outside of Europe but
known by different names. In North America it is known as PCS 1900 and
elsewhere are DCS 1800 (also known as PCS). The only difference between
these systems is the frequency at which operate. The number stands for the
operating frequency in megahertz. While each system uses the GSM standard,
they are not compatible with each other.. |
Related Readings
Bluetooth
GSM
GPRS
3G
WAP
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