Chapter 4: Preparing for installation
194
Best Pract ices for Cabling
The following practices are essential to the reliability and longevity of cabled connections:
l
Use only shielded cables to resist interference.
l
For vertical runs, provide cable support and strain relief.
l
Include a 2-ft (0.6-m) service loop on each end of the cable to allow for thermal expansion and
contraction and to facilitate terminating the cable again when needed.
l
Include a drip loop to shed water so that most of the water does not reach the connector at the
device.
l
Properly crimp all connectors.
l
Use dielectric grease on all connectors to resist corrosion.
l
Use only shielded connectors to resist interference and corrosion.
W iring Connect ors
The following diagrams correlate pins to wire colors and illustrate crossovers where applicable.
Pin 1, relative to the lock tab on the connector of a straight-through cable is located as shown below.
Figure 74 :
Pin 1 location
Main port pinout
Table 118 : Main port pinout
RJ45 pin Description
1
+TxRx0
2
–TxRx0
3
+TxRx1
4
+TxRx2
5
–TxRx2
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