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Advanced Card Technology - Glossary of Terms

GSM Global System Mobile  
Gateway A device that interfaces two dissimilar commuter networks to each other and performs inter-network protocol conversion.  
General Purpose Chip A chip with electrical properties that are set for the handling of a common set of requirements, such as a microprocessor or storage unit.  
Gigabyte A billion bytes.  
Global System Mobile (GSM) A European Telecommunications Standards Institute (ETSI) standard for portable telephones that employ integrated cards for identification and security.  
GND The ISO standard designation for the ground circuit presented on contract C5 of an integrated circuit card (defined in ISO 7816)  
Guard Data Check data included in integrated circuit cards as a countermeasure against loss of integrity due to electromagnetic interference.