Plan where to position the components
14
Materials needed
Because each installation is different, some materials and supplies
for mounting the RAU are provided by the installer. This includes a
pole for mounting the RAU and any materials needed to mount the
junction box on the building. See the following tables:
•
Table 4 on page 10
•
Table 5 on page 10
•
Table 8 on page 16
•
Table 9 on page 20
Radio Antenna Unit
1.
When installing the RAU, use a plumb line to ensure that the
antenna is vertical.
2.
Mount the RAU on a roof or pole high enough to ensure that the
entire antenna has a clear view of the horizon in all directions for
maximum satellite visibility. The antenna can acquire satellites
that appear 10 degrees or more above the horizon.
Note
If mounted on the roof, the entire antenna must be fully above
the roof so that it has an unobstructed overhead view and a
360 degree view of the horizon. It is acceptable to mount the
RAU in proximity to a lightning rod that may be taller than the
RAU. See Figure 27 on page 38.
3.
Ensure that the RAU is located within 15 meters (50 feet) of the
bottom (cable entry side) of the junction box.
Junction Box
1.
Secure the junction box to the outside of the building. The
junction box is the demarcation point between the indoor
(telephone and wiring) and the outdoor (RAU and cabling)
components. The junction box and ground rod provide the user
with protection against lightning strikes both to the RAU and
outdoor cabling. Mount the junction box to the dwelling at the
point of entry of wiring into the building.
2.
Mounting hardware is not provided with the junction box.
Ensure that all cabling designed for use indoors is kept inside the
premises and all cabling designed for use outdoors is kept outside
the premises. It is acceptable for outdoor cabling to enter the
interior of the building; however, interior cabling should never be
used outdoors.
3.
Install the junction box so that the bottom of the junction box is
within 15 meters (50 feet) of the RAU.
The configuration should also take into consideration
— The maximum length of cable between the RAU and the
farthest telephone is 182 meters (600 feet)
— The maximum number of telephones that can be installed is
limited to 5.0B REN per Bellcore TA-NWT-909
— The RAU requires a 12 VDC, 3 A power supply for operation
(10.5 to 16 volts as measured at the junction box)
— The maximum length of cable between the power supply and
junction box is 7 meters (23 feet)
— The junction box should be positioned close to the ground rod.
The maximum length of cable between junction box and
ground rod is 3.5 meters (11.5 feet)
This assumes use of a maximum of 15 meters (50 feet) of
cabling, provided in the enhanced kit or its equivalent, as
specified in Appendix B. Specifications for Cables.
Note
If the building is not already wired for telephone service, the
installer should do this as part of the installer’s service.
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