2N EasyGate, User Manual, Page: 31 / 33

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10. List of Abbreviations
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APN - Access Point Name – necessary for the GPRS service
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CLIP - Calling Line Identification Presentation
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CSD - Circuit Switched Data
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COM - PC serial port
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DTMF - Dual Tone Multifrequency - tone dialing
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EG - EasyGate
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FSK - Frequency Shift Keying
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FXO - an interface electrically identical with a standard telephone (opposite side =
FXS interface)
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FXS - a telephone interface allowing standard telephone connection (opposite
side = FXO interface)
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FW - Firmware - similar to SW, a term for the central microprocessor program
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GSM - Group Switched Mobile system - the present standard digital mobile telephone
network
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GPRS - General Packet Radio Service - high-speed data transmission for GSM
networks
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HW - Hardware - an electronic device, circuit, board, component, etc. in this context
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P(A)BX - Private (Automatic) Branch Exchange
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PC - Personal Computer (based on the IBM PC standard)
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PIN - Personal Identification Number - a SIM card securing password
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PUK - Personal Unblocking Key - a password used to unblock a blocked SIM card
after repeated wrong PIN entering
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RS-232C - a PC serial port standard
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SIM - Subscriber Identity Module - a chip-equipped module to be inserted in a
GSM device for identification
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SMS - Short Message Service, a term for the system and one unit (message)
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SW - Software
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TTL - Transistor-Transistor Logic - a standard digital technology defining voltage
for levels 0 and 1
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PSTN - Public Switched Telephone Network