Transmission media
5981_en_06
PHOENIX CONTACT
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6
Transmission media
Different media can be used for the signal transmission between field multiplexers
depending, for example, on the distance to be covered, the environmental conditions or the
existing infrastructure. For data transmission it is often possible to employ cables that have
already been laid but are not in use.Table 6-1 provides an overview of possible transmission
media and lists advantages that might be decisive for the selection.
When selecting the transmission medium, please note that the number of signals to be
transmitted is limited for Bluetooth or Ethernet transmission:
Table 6-1
Possible transmission media
Medium
Transmission distance
Advantages
Converter (C)/
Modem (M)
required
Copper cable
Up to 12 km
Use of existing data cables
No
Fiber optic
cable
From 100 m up to 45 km
Not sensitive to surge voltages (e.g., out-
door lightning strikes)
For use in environments subject to high
levels of electromagnetic interference
Electrical isolation of system parts/build-
ings
Yes (C)
Telephone line
Almost unlimited, depending on the type
of telephone line (private permanent line
up to 20 km)
Use of public telephone lines possible
Yes (C/M)
Bluetooth
(Wireless)
Up to 150 m
Wireless transmission
Yes (C)
Ethernet
Almost unlimited, depending on the signal
delay in the network
Use of existing Ethernet networks
Yes (C)
Table 6-2
Restrictions for signal transmission
Medium
Maximum number of signals to be transmitted
Bluetooth (Wireless)
50 digital and 2 analog signals
Ethernet
4 analog signals, no restrictions for digital signals
Summary of Contents for 2861205
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