User Documentation

Glossary
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Fibre-optic cable (FO cable)
Type of cable with a glass bre or plastic core which transports digital signals in
the form of light pulses.
GPRS (General Packet Radio Service)
Extension of the mobile GSM standard for the packet-oriented transmission of data.
Half-duplex mode
The half-duplex process permits the alternating use of transmission cable in both
directions. At the interfaces data can only be transmitted or received at any one
time.
Hub
A hub is a form of data communication equipment which allows three or
more devices to link up in a star topology. Incoming data is forwarded to all
other participants as a broadcast. Hubs are no longer used with Fast Ethernet
networks.
IEEE 1588
This is time synchronisation software for connected devices.
If I connect a router to a server, I can keep the time live using the IEEE 1588 standard.
IEEE 802.3
1. Working group of the IEEE (Institute of Electrical and Electronics Engineers)
concerned with the CSMA/CD transmission process
2. Is used as a collective term or a synonym for LAN or Ethernet
IGMP snooping
IGMP snooping is a switch function. The switch snoops on the IGMP trafc on
its ports. This prevents all ports from being ooded with multicast-trafc, which
reduces the network load.
Internet
The Internet is the world's largest network. The Internet was developed in the
1960s for military purposes and released for commercial use in the 1990s. Data
transmission on the Internet is based on the TCP/IP protocol.