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12. Abbreviations
Abbreviation Full Name
DMO Direct Mode Operation
GLONASS Global Navigation Satellite System
GPS Global Positioning System
GSDM Graceful Service Degradation Mode
LED Light-Emitting Diode
OLED Organic Light-Emitting Diode
PABX Private Automatic Branch Exchange
PSTN Public Switched Telephone Network
PTT Push-To-Talk
SK Side Key
TMO Trunked Mode Operation
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