User Documentation

Glossary
2053260000/05/2015
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PHY (Physical Layer)
1. Physical transmission layer
2. This designation is also used for a transceiver in Fast and Gigabit Ethernet.
Point-to-point technology
A connection variant which establishes a connection between two end devices.
These point-to-point connections exist in the network environment, for wireless
transmission in radio relay systems and in connections.
Port
A port is a hardware unit connection: usually an input/output channel for a
computer or another hardware unit like a modem, router, hub or switch.
Port mirroring
Port mirroring can be used with a switch to mirror the data trafc of one port (for
error analysis or for throughput measurements) onto another port.
Promiscuous mode
Promiscuous mode describes a receive mode for network devices. The device
reads all the incoming data trafc to the network interface switched in this mode
and forwards the data to the operating system for processing.
Propagation delay
The propagation delay is the time which a signal needs to pass from one point in
the transmission channel to another.
Protocol
The data transmission protocol denes the rules for exchanging information in
the form of a database. A protocol is an agreement on the connection setup,
monitoring of the connection and its removal.
Quality of Service (QoS)
Quality of service covers all processes which inuence the ow of data in LANs
and WANs such that the receiver receives the service at a dened level of
quality.
Radius
This is an authentication server for networks which contains a database with
user names and passwords. If a user wants to log on to a network PC, he or she
sends his or her login data to the authentication server which enables the PC if
the log-in data is correct and blocks it if the data is incorrect.
RSTP (Rapid Spanning Tree Protocol)
The Rapid Spanning Tree Protocol (RSTP, IEEE 802.3w) is another way of
establishing redundancy in a network.