Appendix
User manual 58185_TREE M4/6-TX PN IP20_hdb_en_10
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Auto-crossover
A device switches between the channels while sending and receiving and stops when
it receives connection data.
Auto-negotiation
Fast Ethernet configuration protocol. Devices on the network agree on a transmission
mode that every device is capable of (100 Mbit/s or 10 Mbit/s; Full-Duplex or Half-
Duplex) before data is actually transferred.
Auto-polarity
If the receiving line pair is connected incorrectly (RD+ and RD- mixed up), the polarity
is reversed automatically.
Auto-sensing
The ability of a device to detect the transmission rate (10 Mbit/s or 100 Mbit/s) auto-
matically and use it for sending/receiving
Bridge
A network component that connects network segments. It makes sure that local data
traffic remains local, i.e., the bridge only forwards data packets to a participant in the
other segment. Errors in a network segment remain confined to that segment. In con-
trast to a switch, a bridge can only control one data flow at any given time.
Burst
A short-term increase in network load due to a large amount of data or messages
Filtering
A switch filters data traffic on the basis of the source and destination addresses in a
data packet. The switch forwards incoming data packets only to the port to which the
end device with the corresponding destination address is connected.
FTP
File Transfer Protocol A network protocol that is used to transfer data from one com-
puter to another over a public network, e.g., the Internet.
FTP is not considered a secure protocol because passwords and the content of files
are transferred in plain text without encryption. However, FTP can be securely imple-
mented using SSH or other technologies.
Full-Duplex
The ability of a device to send and receive data at the same time. Collision detection
is deactivated in full-duplex mode.
Half-Duplex
A device can either receive or send data at a particular time.
HTTP
Hypertext Transfer Protocol An open Internet protocol used to transfer information
over the World Wide Web.
HTTPS
Hypertext Transfer Protocol over Secure Socket Layer A secure version of HTTP with
authentication and encrypted communication across the World Wide Web. Used for
communication with stringent security requirements, e.g., web-based login process-
es.
IEEE 802.1d
Institute of Electrical and Electronics Engineers LAN/MAN Standards Committee
IEEE 802.3
Institute of Electrical and Electronics Engineers Ethernet Working Group
IEEE 802.3u
Institute of Electrical and Electronics Engineers Fast Ethernet Working Group
IP
Internet Protocol A network protocol containing address and management informa-
tion that can be used to forward packets. IP is the primary network protocol.
IP address
The Internet Protocol address. A numerical code that identifies a unique computer on
the Internet.
MAC address
Media Access Control Address A unique ID assigned by manufacturers to network
adapters and network interface cards.
NTP
Network Time Protocol Protocol used to synchronize the clocks of computer systems,
network devices and other system components.
LAN
Local Area Network A network of computers and/or devices, which can be spread
over multiple buildings.
FO
Fiber-optic cable
Protocol
An agreed method for communicating within networks. A specification that describes
the rules and procedures that computer products should comply with when perform-
ing network activities.
RJ45
A symmetrical connector for data lines. Also known as a Western jack/plug. Com-
monly used in telephony and ISDN technology. Also used for LAN setups in an office
environment.
RSTP
The Rapid Spanning Tree Protocol (RSTP) is a network protocol that is used to de-
activate redundant paths in local networks and reactivate them when they are re-
quired (when the connection fails). It was developed on the basis of the Spanning
Tree Protocol (STP) and resolves the main criticisms facing the original protocol. It is
defined in standard IEEE 802.1D-2004.
Term
Meaning
