Siemens SIMATIC NET Instrucciones de operaciones Pagina 44

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Configuring Networks
3-18
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Note on OLM Version 1:
Version 1 OLMs were no longer supplied from the start of 1998 !
To avoid loss of performance in redundant ring structures with OLM version 1 in
the redundant mode, you must take into account the load distribution in the
network. Follow the steps below:
S Find out which OLM transfers the highest volume of data via its twisted pair
ports into the redundant ring.
S Configure the DTEs connected to this OLM so that they take the initiative in
establishing layer 4 connections (active connection establishment).
S Set up a connection from this OLM to port 5 of an adjacent OLM and switch this
adjacent OLM to the redundant mode.
With OLM version 2.0 in the redundant mode, you do not need to take into account
the load distribution in the network.
If version 1 and version 2.0 OLMs coexist in a redundant ring structure, there will
be less configuration effort involved if you switch the version 2.0 OLM to the
redundant mode.
Notes:
S If problems occur implementing a redundant optical ring in practice due to the
optical fiber sections being too long, it is possible to get round the problem. To
do this, each module is physically connected to the next but one module. At the
start and end of a bus connected in this way, the two adjacent modules must be
connected to each other (see Figure 3-6).
S All the modules in a ring must be connected over fiber-optic cables.
OLM
OLMOLM
OLM
OLM
Figure 3-6 Alternative Cabling Technique for a Network Structure with a Redundant
Optical Ring Topology
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