Siemens Electrical Lean Switch - Manual (Page 32)

Ports and Displays
Industrial Ethernet
32 A5E00152007-03
4.3 Ports and Displays of the ELS TP80
4.3.1 TP Ports
Pinning
On the ELS TP80, the TP ports are implemented as RJ-45 jacks with the MDI-X
pinning (Medium-Dependent Interface Autocrossover) of a network component.
Notice
TP Cords or TP-XP Cords with a maximum length of 10 m can be connected to the
RJ-45 TP port. In conjunction with IE FC Outlet RJ-45, a total cable length of
100 m is permitted.
Autonegotiation
Autonegotiation means the automatic detection of the functionality of the port at the
opposite end. Using autonegotiation, repeaters or DTEs can detect the
functionality available at the port of a partner device allowing automatic
configuration of different types of device. With autonegotiation, two components
connected to a link segment can exchange parameters and set themselves to
match the supported communication functionality.
Note
The ELS TP80 is a Plug and Play device that does not require settings to be made
when it is installed.
MDI /MDIX Autocrossover Function
The advantage of the MDI /MDI-X autocrossover function is that straight-pinned
cables can be used throughout and crossover cables are unnecessary. This
prevents malfunctions resulting from mismatching send and receive wires. This
makes installation much easier for the user.
The Ethernet Switch chips used in the ELS all support the MDI / MDI-X
autocrossover function.
Note
Ports of partner stations not supporting autonegotiation must be set to 100 Mbps/
half duplex or 10 Mbps half duplex.