NTP - Network Time Protocol
SNTP - Simple Network Time Protocol

GPS - Global Positioning System
UTC - Coordinated Universal Time

MSF - Radio Time Signal for United Kingdom
WWVB - Radio Time Signal for American
DCF - Radio Time Signal for Germany

LAN - Local Area Network
UDP - User Datagram Protocol
TCP - Transmission Control Protocol
IP - Internet Protocol

TDF - Radio Time Signal for France
CHU - Radio Time Signal for Canada
JJY - Radio Time Signal for Japan
HBG - Radio Time Signal for Switzerland

USB - Universal Serial Bus
RTC - Real Time Clock
AM - Amplitude Modulation
APM - Automatic Power Management
DES - Data Encryption Standard
ESD - Electrostatic Discharge
FM - Frequency Modulation
IETF - Internet Engineering Task Force
IRIG - Inter-Range Instrumentation Group

MD5 - Message Digest
PPM - Part Per Million
PPS - Pulse Per Second
RFC - Request For Comments
SA - Selective Availability
TAI - International Atomic Time
SI - International System of Units