Installing the IpChannel Bank
32
SmartNode 4900 Series Getting Started Guide
3 • Hardware installation
Note
Some NTUs have non-standard connections and require special
cables. Consult the NTU maker’s product documentation
Connecting to an external power source
In connecting to the power source, it is important to establish a good grounding connection first, then the
power connection. This section explains:
•
Making the ground connection for either AC or DC units (see section
“Grounding the Model SN4900—
AC and DC units”
)
•
Connecting to an AC power source (see
“Installing the power cables—AC units”
on page 33)
•
Connecting to a DC power source (see
“Installing the power cables—DC units”
on page 34)
Grounding the Model SN4900—AC and DC units
Do the following:
1. Assemble a ground wire using #10 AWG wire with green-colored insulation and two ring terminals. Make
the wire long enough to reach one of the following
earth
ground sources:
– The building ground rod (generally located at the site’s main service entrance)
– A sprinkler system pipe
– A cold-water pipe
– Building structural steel
Figure 11. IEC-320 connector and grounding stud locations
2. Install the grounding wire between the grounding stud (see
figure 11
) and the grounding source.
24
XTC-a (to DCE)
Table 8. Serial port pin-outs
V.35 Interface (DB-25)
X.21 interface (DB-15)
Power cable
retainer clip
Grounding stud
IEC-320 connector
(2 places)
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