3.1 Line topology 
11
3 Network Topologies
Version 2.4  04/07
3.1.2  Line topology without optical fiber
link monitoring
Use this operating mode if you connect a OZD Profi 
12M … with another optical fiber network component,
which does not send a frame echo and does not expect
or is not compatible with a frame echo in accordance
with PROFIBUS guidelines (optical/electrical converter).
䡲 Monitoring mechanisms:
Send echo: no
Monitor echo: no
Suppress echo: no
Monitor: no
Segmentation: no
Individual fiber links are not monitored in this operating
mode.