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4.7
Mounting distance for parallel operation with DDLS 200 data transmission system
For the determination of the minimum mounting distance, the details on parallel operation apply (see
chapter 4.5 "Mounting distance for parallel operation of data transmission systems for devices with
frequency F0").
4.8
Cascading (series connection) of multiple data transmission systems
If there are multiple optical data transmission paths between two participants, one speaks of cascading.
NOTICE
Cascading only with optical separation of the transmission paths!
Optical separation between the transmission paths is absolutely necessary.
Cascading is generally only possible if the transmission paths do not mutually influence one another.
1
2
3
Figure 4.15: Example: Cascading of multiple data transmission systems
Protocol-dependent cascading
The specifications of the protocols to be transmitted, with respect to the delay times or jitter tolerances,
must not be violated.
Due to the very short delay times of the devices, cascading is possible without problem for very many
Ethernet protocols.
For transmission protocols that are very tightly specified with respect to delay times and jitter tolerances
(e.g., for synchronous transmissions), the user must check the suitability of the devices individually.
• Protocol propagation times:
Constant delay time per path (2 devices): 5 µs
• Distance-dependent delay:
Distance 0 m: 0 µs
Distance 120 m: 0.40 µs
Leuze electronic
1
Optical data transmission path 1
Optical data transmission path 2
Optical separation
3
DDLS 508
Mounting
2
34
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