
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-04
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Introduction
1
The switching technology of the Industrial Ethernet OSM Version 2/ESM
(Optical/Electrical Switching Module) allows the structuring of Ethernet networks with
large spans and large numbers of nodes. It simplifies network configuration and
network expansions. The OSM Version 2/ESM are simply called OSM/ESM in the rest
of this manual.
The OSMs have both electrical ports and additional FO ports via which several of
these devices can be interconnected to form an optical bus or ring configuration.
ESMs only have electrical ports.
DTEs, other OSMs/ESMs or complete network segments operating at 10 or 100 Mbps
can be connected to the electrical auto-negotiation (autosensing) ports of the
OSM/ESM. The transmission rate is detected automatically.
To increase availability, ring configurations can be created with OSMs or ESMs. To do
this, OSMs or ESMs are first connected together to form a bus (via ports 7 and 8) .
The two ends of the rings are closed by an OSM or ESM operating in the RM
(redundancy manager) mode.
The OSM or ESM operating in the RM mode monitors the attached bus and allows a
connection through it if it detects an interruption on the attached bus; in other words, it
reestablishes a function bus. Reconfiguration is completed within 0.3s. An OSM/ESM
is switched over to the RM mode using a DIP switch on the device.
The redundant standby coupling allows the redundant coupling of OSM/ESM or OLM
rings. To do this, two OSM/ESMs (one operating in standby mode) are connected via
their standby sync ports.
In the ITP variants of the OSM/ESM, the DTEs are attached using the particularly
robust Industrial Twisted Pair (ITP) connector with its high immunity to noise. In the
TP variants, the DTEs are connected via RJ-45 female connectors.
The Version 2 OSMs are compatible with the previous OSM variants (6GK 1105-
0AA00) and ORM (6GK1105-1AA00) and can, for example, be mixed with these in an
optical ring.
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