Important OSM/ESM Functions
2-3
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
2.2 Autocrossover
Electrical OSM/ESM ports with the autocrossover function are capable of crossing
over the send and receive signals internally in the port. This means that
straight-through or crossover TP cables can be used without causing problems.
To use the autocrossover function:
S At least one of the two ports must support the autocrossover function.
S The autonegotiation mode must be set on the port providing the autocrossover
function.
OSM TP22, ESM TP40 and all OSMs/ESMs with order numbers ending in “10” (for
example, 6GK1105-2AA10) provide autocrossover functionality.
Notice
Please note that even when using straight-through cables, an invalid loop can re-
sult in the Ethernet network, for example, by linking two ports on one OSM/ESM.
Such a loop can lead to network overload and network failures.
2.3 Transmission Rate and Duplicity
The transmission rate and/or duplicity of the electrical ports can also be set by the
user with network management functions. The values are shown in Table 2-1
below.
The transmission rate and duplicity of a port set by the user only comes into effect
if autonegotiation is turned off for the port.
Table 2-1 Transmission Rate and Duplicity
Ports Transmission
Rate
Duplicity
Electrical ports 10 or 100 Mbps Half duplex or full duplex
Optical ports only 100 Mbps Only full duplex
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