EU
Chapter 4. Legend
GSM
GSM (Global System for Mobile Communications) is the most popular standard for mobile
telephony systems in the world. GSM is a cellular network, which means that mobile phones
connect to it by searching for cells in the immediate vicinity.
GPRS
General Packet Radio Service (GPRS) provides more efficient packet-based data transmission
directly from the mobile phone at speeds similar to HSCSD.
GPRS extends the GSM circuit switched data capabilities and makes some additional services
possible.
4G LTE
LTE, an abbreviation for Long-Term Evolution, commonly marketed as 4G LTE, is a standard
for wireless communication of high-speed data for mobile phones and data terminals. It is based
on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed
using a different radio interface together with core network improvements. The standard is
developed by the 3GPP (3rd Generation Partnership Project) and is specified in its Release 8
document series, with minor enhancements described in Release 9.
LTE is the natural upgrade path for carriers with both GSM/UMTS networks
and CDMA2000 networks. The different LTE frequencies and bands used in different countries
will mean that only multi-band phones will be able to use LTE in all countries where it is supported.
RS232
In telecommunications, RS-232 (Recommended Standard 232) is a standard for serial binary
single-ended data and control signals connecting between a DTE (Data Terminal Equipment) and
a DCE (Data Circuit-terminating Equipment). It is commonly used in computer serial ports. The
standard defines the electrical characteristics and timing of signals, the meaning of signals, and
the physical size and pinout of connectors.
