Siemens VIU-20 Installation And Instruction page 19

TERM
SIN Site Identification Number. The 12-digit ATCS address for the VIU equipment, entered
via
7.RRR.LLL.GGG.SS stored in binary coded decimal, with each digit in one nibble.
The digit 0 is represented by "A" and 0 is used as a null byte.
SMA Sub-Miniature version A.
TCP/IP Transmission Control Protocol / Internet Protocol. The suite of
Network protocols
two main ones being
is used by the Internet, making it the
networks.
TMC Train Management Computer.
interprets messages from the WIU and controls the locomotive operations
accordingly.
TRM Transmission Radio Modem
TSR Temporary Speed Restriction
UCN Unique Check Number. A 32-bit CRC calculated over the MCF, SIN and vital
configuration parameters. Used to verify that the configuration is correct. It is stored in
the ECD to detect file corruption.
UDP User Datagram Protocol. One of the core protocols of the Internet protocol suite.
Using UDP, programs on networked computers can send short messages sometimes
known as datagrams (using Datagram Sockets) to one another.
UNS Unified Numbering System.
USB Universal Serial Bus. A serial bus standard to interface devices. USB was designed to
allow many peripherals to be connected using a single standardized interface socket
and to improve the plug-and-play capabilities by allowing devices to be connected
and disconnected without rebooting the computer (hot swapping). Other convenient
features include providing power to low-consumption devices without the need for an
external power supply and allowing many devices to be used without requiring
manufacturer specific, individual device drivers to be installed.
UTC Coordinated Universal Time.
VIU Vital Interface Unit. A device that monitors switch positions and signal aspects and
then generates vital status messages reflecting the current state of the monitored
equipment.
VLAN Virtual Local Area Network
VPF Vital Parallel Flashing (VPF) input circuit. The VIU Master I/O circuit with 10 vital
inputs that runs appliance model logic and detects steady and flashing inputs.
Identical Slave circuits provide10 additional vital inputs with similar functionality .
SIG-00-07-11
Version No.: B.2
the Web interface and stored in the ECD. The SIN has the form
used to connect hosts
TCP and IP. TCP/IP is built into the
DESCRIPTION
on the Internet. TCP/IP uses several protocols, the
de facto standard
The CBTC Computer on board a locomotive that
xix
SEPTEMBER 2012 (REVISED OCTOBER 2019)
communications
UNIX operating system
for transmitting data
and
over