Operating instructions

Industrial Ethernet OSM/ESM
C79000-Z8976-C068-04
85
Glossary
10
Auto Polarity
Exchange
Procedure in which the module automatically detects incorrect attachment
of a cable to the electrical OSM/ESM port (RD+ and RD- swapped over).
The OSM then reverses the polarity automatically.
Auto-Negotiation
Procedure standardized by IEEE 802.3 in which the transmission
parameters (for example 10/100 Mbps, full/half duplex) are negotiated
automatically between the devices.
Autosensing
See Auto-Negotiation
Backbone
In conjunction with the OSM/ESM, this means a bus or ring structure
made up of interconnected OSM or ESM modules that form the backbone
of an industrial LAN.
Display Mode
The two display mode LEDs indicate the display mode of the Port and
Power LEDs of the OSM/ESM. The display mode can be changed with the
button on the front panel of the OSM.
ESM
Electrical Switching Module. SIMATIC NET Ethernet switch with electrical
ports
Fault Mask
See fault mask
Fault Mask
The fault mask specifies which ports (ports 1 - 8) and power supply
terminals (line 1/2) are monitored by the signaling contact. The fault mask
can be set again with the button on the front panel of the OSM/ESM.
Filtering
OSMs/ESMs learn the addresses of the devices that can be accessed via
a port. They redirect the packets intended for this device only via this port.