Manual

List of Abbreviations 6.4
76
n RS-232C
a PC serial port standard
n SIM
Subscriber Identity Module - a chip-equipped module to be inserted in a
mobile device for identification in network
n SMS
Short Message Service, a term for the message system in mobile network,
used for message too
n SW
Software
n TTL
Transistor-Transistor Logic - a standard digital technology defining voltage for
levels 0 and 1
n PSTN
Public Switched Telephone Network
n UMTS
Universal Mobile Telecommunication System – third generation of mobile
network communication system
n WCDMA
Wideband Code Division Multiple Access – technology of wireless transmitting
in UMTS network, allows higher data transmit rate than GSM technology