6.4 List of Abbreviations

  • APN – Access Point Name – necessary for the GPRS service
  • CLIP – Calling Line Identification Presentation
  • CSD – Circuit Switched Data
  • COM – PC serial port
  • DTMF – Dual Tone Multifrequency – tone dialing
  • EG – EasyGate
  • FSK – Frequency Shift Keying
  • FXO – an interface electrically identical with a standard telephone (opposite side = FXS interface)
  • FXS – a telephone interface allowing 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 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 (based on the IBM PC standard)
  • PIN – Personal Identification Number – a SIM card securing password
  • PUK – Personal Unblocking Key – a password used to unblock 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
  • SMS – Short Message Service, a term for the system and one unit (message)
  • SW – Software
  • TTL – Transistor-Transistor Logic – a standard digital technology defining voltage for levels 0 and 1
  • PSTN – Public Switched Telephone Network

  • UMTS – Universal Mobile Telecommunication System – third generation of mobile network communication system

  • WCDMA – Wideband Code Division Multiple Access – technology of wireless transmitting in UMTS network, allows higher data transmit rate than GSM technology.