Siemens SINUMERIK 840DE sl Commissioning Manual page 1416

Appendix
A.1 Abbreviations
SNMP Simple Network Management Protocol (network protocol for monitoring and controlling network elements
such as routers, servers, switches, and printers from a central station).
SSD Solid State Drive
SSH Secure Shell: Protocol for an encrypted network connection with a remote device
TCU Thin Client Unit
TFTP Trivial File Transfer Protocol: Very simple data transmission protocol
UDP User Datagram Protocol: NTP is mostly processed via UDP.
USB Universal Serial Bus
UPS Uninterruptible power supply
UTC Universal Time, Coordinated: Coordinated Universal Time (previously: Greenwich Mean Time)
VNC Virtual Network Computing
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Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
NCU operating system