Phoenix Contact FL SWITCH EP7400 handleiding

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Handleiding

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 ca-

ble.

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.

Copper 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.

Table 5-6 1000 Base-TX MDI port MDI-X port

RJ45 pin Assignment

“+” 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-

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