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6.3 List of Abbreviations
APN (Access Point Name)
Necessary for the GPRS service.
CLIP (Calling Line Identification Presentation)
CSD (Circuit Switched Data)
COM
A PC Serial port.
DTMF (Dual Tone MultiFrequency)
Tone dialling.
FSK (Frequency Shift Keying)
A transmission protocol using variable signal frequencies for logic level
encoding.
FXO
An interface electrically identical with a standard telephone
(opposite side = FXS interface).
FXS
A telephone interface allowing a standard telephone connection
(opposite side = FXO interface).
FW (Firmware)
Similar to SW, a term for the central microprocessor program.
GSM (Group Switched Mobile system)
The present-day standard digital mobile telephone network.
GPRS (General Packet Radio Service)
High-speed data transmission for GSM networks.
HW (Hardware)
An electronic device, circuit, board, component, etc. in this context.
P(A)BX (Private (Automatic) Branch Exchange)
PC (Personal Computer)
A personal computer based on the IBM PC standard.
PIN (Personal Identification Number)
A SIM card securing password.
PUK (Personal Unblocking Key)
A password used for releasing a blocked SIM card after repeated wrong PIN
entering.
RS-232C
A PC serial port standard.
SIM (Subscriber Identity Module)
A chip-equipped module to be inserted in a GSM device for identification.
SmG
2N
SmartGate
SMS (Short Message Service)
A term for the system and one unit (message).
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