Eaton easyE4 series Manual page 619

outside of the network will be unable to determ-
ine which specific computer requested the
data. This is because all the computers on the
private network will appear under the same IP
address on the Internet.
RxD
Receive cable for received data
S
SD card
Secure Digital memory cards are non-volatile,
rewritable flash data storage devices that are
used with Eaton and are commonly referred to
as microSD cards. Data written to these cards
is stored in a non-volatile manner that does not
require any additional (secondary) power.
SELV (safety extra low voltage)
Circuit in which no dangerous voltage occurs
even in the event of a single fault.
Server:
The term "server" is usually used to refer to
computers that provide services on a network.
Admittedly, however, this definition is not very
precise. More specifically, servers are applic-
ations on a computer that are responsible for
providing or processing data. In fact, every com-
puter can provide such services. Servers are
not active in and of themselves. They wait until
they are addressed by a client, after which they
perform the corresponding tasks. Each server
application provides its service on the network
via a specific port.
Slot
Refers to a slot for a memory card
SNTP
Simple Network Time Protocol
SSL/TLS
Secure Sockets Layer/ Transport Layer Secur-
ity
easyE4 11/18 MN050009 EN www.eaton.com
ST
Structured Text - programming method
Stroke
A hub is a device used to connect various net-
work devices together. Hubs broadcast all data
to all connected devices (devices connected
with a patch cable).
Subnet mask
A subnet mask is an IP address "filter." It has
the same syntax as an IP address. This mask
defines which computers can transfer data
between themselves within a network. This
also means that subnet masks define the max-
imum size of the corresponding subnetworks.
Switch
Switches are networking devices that are more
advanced than hubs. One of the main features
that sets them apart from the latter is the fact
that they are more "intelligent" and forward data
packets much more efficiently by sending them
only to the devices that need to receive them.
Multiple data packets can pass through a
switch at the same time. Among other things,
this means that switches have a significantly
higher total bandwidth (throughput) than hubs.
Moreover, switches learn which stations are
connected to which ports, meaning that addi-
tional data transfers will not result in any ports
being subjected to unnecessary loads, i.e., that
data will only be forwarded to the port con-
nected to the intended destination. With the
exception of their higher price, switches are
superior to hubs in every way.
System character set
Font type and size used to output system mes-
sages.
T
TE
Space units
615