IP - Internet Protocol; 
IP40 - Degree of protection 40; 
IRIG-B - Time synchronism protocol Inter Range Instrumentation Group (Rate Designation B); 
LCD - Liquid Crystal Display; 
MAC - Media Access Control; 
NTP - Network Time Protocol; 
OUT - Abbreviation of the term Output; 
P2P - Peer-to-peer; 
PLC- Programmable Logic Controller; 
PPM - Pulse per minute; 
PRP - Parallel Redundancy Protocol; 
PPS - Pulse per Segundo; 
PPX - Pulse per X s; 
PTP - Precision Time Protocol; 
RFC - Data formatting specification RFC 1951, DEFLATE; RJ45 - Ethernet Connector with 8 condutors; 
RS232/485 - Serial port levels; 
RT - Temporal Recorder (Alstom's Temporal Synchronization Equipment); 
RX - Receiving data; 
SNMP - Simple Network Management Protocol; 
SNTP - Simple Network Time Protocol; 
ST - Bayonet-lock connector; 
TCP - Transmission Control Protocol; 
TMARK - Daily pulses with programmable time; 
TTL - Transistor-to-Transistor logic; 
TX - Data transmission; 
UDP - User Datagram Protocol; 
UTC - Universal Time Coordinate.