Siemens ESM - Manual (Page 10)

Introduction
Industrial Ethernet OSM/ESM
6 C79000-Z8976-C068-10
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 autonegotiation (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 using their ring
ports. The ends of the bus are closed to form a ring by an OSM or ESM operating
in the Redundancy Manager mode (RM 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.
With the ITP variants of the OSM/ESM, the DTEs are connected using sub-D
female connectors. This connector technology allows direct links over distances up
to 100 m. With the TP variants, the DTEs are connected using RJ-45 jacks.
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.
This manual describes the functions of the OSM/ESM available without using
network management. The OSM/ESM Network Management user manual /1/
describes the additional options available if you use network management. You will
find this manual on the CD accompanying every OSM/ESM or you can download
the manual from the Web in Siemens Customer Support under entry number
8677203:
http://www4.ad.siemens.de/view/cs/de/8677203