Product properties
3.4 SCALANCE X104-2
SCALANCE X-100
Operating Instructions, 04, A2B00060666D
15
Autonegotiation
Autonegotiation means the automatic detection of the functionality of the port at the opposite
end. Using autonegotiation, repeaters or end devices 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
Devices not supporting autonegotiation must be set to 100 Mbps half duplex or 10 Mbps half
duplex.
Note
The SCALANCE X104-2 is a plug-and-play device that does not require settings to be made
for commissioning.
Auto polarity exchange
If the pair of receiving cables are incorrectly connected (RD+ and RD- swapped over), the
polarity is adapted automatically.
MDI /MDIX autocrossover function
The advantage of the MDI /MDIX autocrossover function is that straight-through cables can
be used throughout and crossover Ethernet cables are unnecessary. This prevents
malfunctions resulting from mismatching send and receive wires. This makes installation
much easier for the user.
The devices of the SCALANCE X-100 product line all support the MDI / MDIX autocrossover
function.
NOTICE
Please note that the direct connection of two ports on the switch or accidental connection
over several switches causes an illegal loop. Such a loop can lead to network overload and
network failures.
3.4.3
SCALANCE X104-2 FO ports
Transmission rate
The transmission rate of the optical Fast Ethernet ports is 100 Mbps.
Transmission mode
The transmission mode for 100Base-FX is specified in the IEEE 802.3 standard.
Summary of Contents for SIMATIC NET SCALANCE X-100 Series
Page 40: ...Product properties 3 12 Displays SCALANCE X 100 40 Operating Instructions 04 A2B00060666D ...
Page 54: ...Approvals and markings SCALANCE X 100 54 Operating Instructions 04 A2B00060666D ...
Page 62: ...References SCALANCE X 100 62 Operating Instructions 04 A2B00060666D ...
Page 72: ...Glossary SCALANCE X 100 72 Operating Instructions 04 A2B00060666D ...
Page 74: ...Index SCALANCE X 100 74 Operating Instructions 04 A2B00060666D U UL approval 6 ...