Phoenix Contact 1144175, User Manual, Page: 27 / 40

Table 5-6 1000 Base-TX MDI port MDI-X port
RJ45 pin Assignment
1
1
“+” and “-” signs represent the polarity of the wires that
make each wire pair
1 BI_DA+ BI_DB+
2 BI_DA- BI_DB-
3 BI_DB+ BI_DA+
4 BI_DC+ BI_DD+
5 BI_DC- BI_DD-
6 BI_DB- BI_DA-
7 BI_DD+ BI_DC+
8 BI_DD- BI_DC-
Device management
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5.4 Recommendations for cables in high electrical
noise environments
Constant electrical noise can be due to the predictable 50 or 60 Hz AC “hum” from power
circuits or harmonic multiples of power frequency close to the data communications cable.
Follow these recommendations for copper data cabling in high electrical noise environ-
ments:
– Data cable lengths should be as short as possible, preferably 3 m (10 ft) in length. Cop-
per data cables should not be used for inter-building communications.
– Power and data cables should not be run in parallel for long distances, and they should
be installed in separate conduits. Power and data cables should intersect at 90° angles
when necessary to reduce inductive coupling.
– Ground loops which are major cause of noise propagation must be avoided.
5.5 SFP
The FL SWITCH EP74… supports fiber optic ports that can connect to other devices using
SFP (Small Form-factor Pluggable) modules. SFP-based fiber optic ports with multimode
(MM) or single mode (SM are available as well as a RJ45 twisted pair SFP. Be sure to select
the SFP that is compatible with the data rate of the SFP slot.
For fiber connections always connect the TX fiber connection of switch A to the RX fiber
connection of switch B.
The SFP modules must be purchased separately.
5.5.1 General fiber optic cable handling instructions
WARNING:
Never look into fiber optic cables. Laser radiation might be emitted from disconnected
fibers or connectors.