User Documentation
Glossary
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Layer-2-Switch
Data link layer. This is the level at which the unmanaged switches operate
which can be incorporated in a network and only write an entry to the source
address table using the MAC address and a physical port. This distinguishes
the unmanaged switch from the hub. The hub forwards the data packets to all
connected end devices while the switch only forwards to the end device stated
in the source address table; if there is no entry in the SAT, the data packet is sent
to all end devices as with a hub.
Layer-3-Switch
Network layer. This is the level at which the managed switches operate which
provide functions above and beyond simply forwarding data packets. The operator
can use the managed functions to congure various settings via the web interface
on the switch. Examples of these could be control functions, monitoring functions,
IP ltering, VLAN, prioritisation for quality of service and routing.
Link integrity test
This test checks whether an Ethernet connection is correctly connected and
whether the signals are correctly transferred. It is a useful addition but does not
guarantee that the link is fully functional.
Link layer
Link layer in the OSI reference model
Link pulse
A detection pulse which is transmitted from 10BaseT stations to 100BaseT
stations for auto-negotiation
M12, d-coded
M12, d-coded is a 4-pole plug-in connector variant for Industrial
Ethernet according to ISO IEC 61076-2-101. It undertakes data transmission
according to cat. 5 and ensures IP 67 level of protection.
MAC address
A 6-byte long hardware address which is used to uniquely identify a device in
the network
MDI
MDI stands for Medium Dependent Interface and refers to an Ethernet
connection. It generally describes a network card's connection for the network
cable – i.e. the network socket.