Globalstar GSP-2800 User manual

This guide is based on a version of the QUALCOMM Globalstar
GSP-2800/2900 Fixed Satellite Phone. Software changes may have
occurred after this printing.
QUALCOMM reserves the right to make changes in technical and
product specifications without prior notice.
QUALCOMM Incorporated
5775 Morehouse Drive
San Diego, CA 92121-1714
U.S.A.
Document Number 80-98052-1EN Rev. A
Model Number CKABS0001
Copyright 1999 QUALCOMM® Incorporated.
All rights reserved.
This technology was exported from the United States in accordance with
the Export Administration Regulations. Diversion contrary to U.S. law
prohibited.
QUALCOMM® is a registered trademark of QUALCOMM Incorporated.
Globalstar ™ is a trademark of Loral Qualcomm Satellite Services, Inc.
All other trademarks are property of their respective owner.
Printed in the United States of America.

Contents
iii
Contents
Introduction ................................................................................ 1
The basics of good antenna location .........................................1
Globalstar is different .........................................................1
Can I mount the RAU on the side of a building? ...............2
Fine points of antenna location ..........................................2
Power lines ..........................................................................3
Television antennas ............................................................3
Trees ....................................................................................3
Chimneys .............................................................................3
Seemingly hopeless situations ............................................4
Step 1. Safety considerations ................................................... 5
General .......................................................................................5
Power ..........................................................................................5
Batteries .....................................................................................5
Lightning ....................................................................................6
Step 2. Inventory ........................................................................ 7
Check the contents of the QGFSP package ..............................7
Base Kit ......................................................................................7
Enhanced Kit .............................................................................9
Make sure you have all supplies and equipment ...................10
Grounding Accessories ............................................................10
Step 3. Plan where to position the components ................. 12
How to use the sighting tool ....................................................13
Materials needed .....................................................................14
Radio Antenna Unit .................................................................14
Junction Box ............................................................................14
Power Source ...........................................................................15
Step 4. Prepare the RAU .......................................................... 16
Security Module .......................................................................17
Step 5. Mount the RAU on a pole or wall ............................ 18
Mounting the RAU to a pole ...................................................18
Mounting the RAU to a wall ...................................................20
Step 6. Ground the QGFSP ..................................................... 21
Pole Mount ...............................................................................21
Grounding ................................................................................21
Lightning Protection ...............................................................23
Step 7. Install the junction box .............................................. 25
Step 8. Run indoor wiring for the telephone and data ..... 28
Connect interior wiring to jacks and telephones .................. 28
Connect interior wiring to the junction box .......................... 28
Selecting a telephone .............................................................. 29
Step 9. Connect power supply ................................................ 30
QUALCOMM Power Supply, Model GPO-1000 .................... 30
AC to DC Converter ................................................................ 30
Motor Generator ..................................................................... 30
Battery Power ......................................................................... 30
Solar Power ............................................................................. 30
Step 10. Connect power and test ............................................ 32
Make sure that all cables are connected ............................... 32
Check cable connections ......................................................... 32
Turn on power and perform power checks ............................ 33
Final check .............................................................................. 33
Step 11. Troubleshooting ......................................................... 34
Terminology ................................................................................ 35
References ................................................................................... 35
Appendix A. Standard practices for grounding ................. 36
Ground rods ............................................................................ 36
Separate RAU ground equipment .......................................... 36
Ground rod terminations ........................................................ 36
Appendix B. Specifications for Cables ................................. 39
Conductors .............................................................................. 39
Insulation ................................................................................ 39
Jacketing ................................................................................. 39
Environmental Requirements ................................................ 39
Performance Criteria .............................................................. 39
Cable Construction ................................................................. 40
Appendix C. Operating Specifications ................................. 41
Power Specifications ............................................................... 41
Mechanical Specifications ...................................................... 41
RAU ................................................................................... 41
Antenna ............................................................................ 41
Environmental Specifications ................................................ 41
RAU ................................................................................... 41
Appendix D. Third Party Equipment .................................... 42
Product: SunWize™ Power Ready Systems ......................... 42

iv
List of Figures
Figure 1. General RAU pole mount installation .........................1
Figure 2. Roof mounted RAU ......................................................12
Figure 3. Pole mounted RAU ......................................................12
Figure 4. Incorrect placement of RAU .......................................12
Figure 5. Sighting Tool ...............................................................13
Figure 6. Locating possible obstructions ....................................13
Figure 7. RAU with cover removed ............................................16
Figure 8. Detail of P clip .............................................................16
Figure 9. Detail of RAU inside ...................................................17
Figure 10. SM Card and holder ....................................................17
Figure 11. Lift the socket cover ....................................................17
Figure 12. Insert the SM ...............................................................17
Figure 13. Attach the RAU to the pole .........................................18
Figure 14. RAU with wall mounting bracket in place ................20
Figure 15. Attach primary grounding cable to RAU ...................21
Figure 16. Ground wire/ground rod connector .............................21
Figure 17. Ground the junction box .............................................22
Figure 18. Grounding elements ....................................................22
Figure 19. Service provider access closed ....................................25
Figure 20. Service provider access open ......................................26
Figure 21. RAU cable ....................................................................27
Figure 22. Indoor connection ........................................................28
Figure 23. Jack ..............................................................................28
Figure 24. Wiring for power supply .............................................30
Figure 25. Suggested installation for solar power .......................31
Figure 26. Troubleshooting ...........................................................34
Figure 27. Grounding a building with existing lightning
protection .....................................................................38

v
List of Tables
Table 1. Base Kit .........................................................................7
Table 2. Mounting Kit .................................................................8
Table 3. Enhanced Kit ................................................................9
Table 4. Grounding Supplies ....................................................10
Table 5. Interior wiring ............................................................10
Table 6. Power Supply ..............................................................11
Table 7. Tools ............................................................................11
Table 8. Connections .................................................................16
Table 9. Recommended materials for wall mount ...................20
Table 10. Grounding elements* .................................................23
Table 11. Wiring from RAU to junction box ..............................27
Table 12. Wiring from interior to junction box ..........................28
Table 13. Conductor Requirements ............................................39
Table 14. Environmental Requirements ....................................39
Table 15. Performance Criteria ..................................................39
Table 16. Cable Construction .....................................................40
Table 17. Power specifications ...................................................41
Table 18. Mechanical specifications ...........................................41
Table 19. Antenna .......................................................................41
Table 20. Environmental specifications .....................................41

Introduction
1
Introduction
Figure 1. General RAU pole mount installation
Installing a QUALCOMM Globalstar Fixed Satellite Phone (QGFSP)
is not the same as installing a telephone or a satellite dish for
television. For example:
1. The RAU must have a clear view of the entire sky or it will not
work.TheantennaoftheRAUshouldhaveanunobstructedview
of the sky down to 10 degrees above the horizon (see Figure 1).
2. Grounding of the entire QGFSP system is vital and must be done
correctly in order to protect the QGFSP and the people who use
it. If the RAU, junction box, or wiring are improperly installed,
or if the system is not properly grounded, there is, in extreme
circumstances, risk of fire, personal injury, or death.
This guide explains how to install the components of the QGFSP. In
this guide, we call the complete unit, including the telephones, the
QGFSP. When we talk about the QGFSP, we are talking about the
entire Globalstar installation.
Figure 1 shows an example of how the radio antenna unit (RAU) and
junction box might be installed using a pole mounted on the outside
of the building.
The basics of good antenna location
It is important that you install the RAU in a good location. But just
what is a good location? Read on. We’ll try to explain.
The antenna of the RAU needs to have a direct line of sight to the
Globalstar satellites. That means it needs to be able to see the sky
with nothing in the way.
You may be familiar with television satellites that are in a fixed
location in the sky. For those satellites, you can aim an antenna at
one place,and it doesn’t matterwhether you have a clear shot to any
other part of the sky.
Globalstar is different
Globalstar satellites move. They come up over
the horizon, zip across the sky, and then drop behind a hill. They
follow different paths.
052AB_1999Q
12V power
supply
Junction box
(outside wall)
ground rod
Ground wire
Ground level
Telephone
Inside
Building
RAU cable
(outside line)
(outside line)
Telephone cable (inside line)
Power cable (inside line)
Antenna
Radio unit
RAU
(Mount RAU for
clear view of sky
and horizon)
10°10°
Reception zone
Pole not
supplied

Introduction
2
Because you don’t know what part of the sky the satellites will be in,
you need to find an RAU location where the antenna can see as much
of the sky as possible. The rule is that the antenna of the RAU should
see the entire sky down to 10 degrees above the horizon.
The QGFSP and satellites use a different kind of radio signal: high
frequency microwave signals. Unlike television and AM or FM radio
signals, or even cellular phone signals, microwave radio signals do
not bend. They are strictly line of sight. This means that these
signals do not go through walls. They do not go around hills or
through trees or over bushes. If something gets between thesatellite
and the QGFSP, the phone won’t work.
Be sure to install the QGFSP such that there are no objects blocking
the view of the sky. To help you figure out if objects are above 10
degrees or below 10 degrees, you can use the sighting tool that is
included in your kit. Use of the sighting tool is explained in How to
use the sighting tool on page 13.
Sometimes it won’t be possible to
get such a full clear view. In that
case, you should try to find a
location that gets as full and clear
a view of the sky as possible.
Can I mount the RAU on the side
of a building?
Generally no. Mounted on the
side of a building, the antenna
would only see half the sky.
However, you could mounta mast
bracket on the side of a building,
then extendthemast upabove the
roof, and mount the RAU there. See Figure 1 onpage 1 for how that
could be done.
Fine points of antenna location
As we said before, the Globalstar satellites are always moving. They
zip across the sky, taking from 10 to 15 minutes to gofrom horizon to
horizon. Sometimes a person will install an RAU in a bad location,
and be fooled into thinking the installation is correct just because he
was able to make a good phone call. Don’t be fooled! Just because
you can make a call now doesn’t mean you will be able to make a call
a few minutes later when the satellites have changed position. The
only way to ensure that the QGFSP will work reliably and
consistently is to make sure that the antenna of the RAU can see
most of the sky. You can’t tell a good location from a bad location by
making a test call.
Sometimes it is very difficult to find a location where there is nothing
at all in between the antenna and some part of the sky. Some obvious
challenges are trees, power lines, television antennas, and lightning
rods. The ideal location has nothing in the way. However, some
things can sit in the path between our RAU antenna and the satellite
without causing harm.

Introduction
3
Power lines
Power lines are usually not a problem. As long as the RAU is at least
10 feet away from the power lines, the signal will be able to go
through the power lines without a problem. Power poles can block
the signal however. Try to avoid having power pole blockage. If it is
impossible to avoid power pole blockage, try to locate the Globalstar
RAU as far from the power poles as possible.
Television antennas
Many homes have tall television antennas on their roofs. It would
often be quite difficult to put the RAU high enough to avoid having
the television antenna in the way. Good news! You do not have to
put the RAU higher than the television antenna. If you locate the
RAU at least 10 feet away from the television antenna and mast, the
television antenna and mast will not cause blockage. (This presumes
a standard 1 1/2 inch diameter television antenna mast. If, instead
ofa simple mast,you have a largeantenna tower,thenyoushouldtry
to locate the Globalstar antenna farther away.)
Trees
Trees are almost always bad for satellite reception. Try to avoid
them. The Globalstar signal will go through some thin trees.
However, trees will grow, and the problem will get worse over time.
Trees also cause much more blockage when they are wet. The signal
may find its way through the trees this afternoon, but have more
troubleinthe eveningafterthesunsetsand dew formsonthe leaves.
Try to avoid having trees in the way of your satellite signals.
If a house is surrounded by trees, you should consider putting the
Globalstar RAU on a mast, extended up from the roof of the house.
Ideally, the mast would be tall enough so that the antenna of the
RAU can see most of the sky.
Chimneys
The Globalstar signal will not go through a chimney. If you mount
the antenna on the side of a chimney, the signal will not be able to go
through the chimney, so the antenna would only see half the sky.
That’s bad.
If you attach a mast to a chimney mount, then extend the antenna of
the RAU above the chimney, you may have a good installation.
However, soot from the chimney may accumulate on the antenna
over time. Soot contains carbon that will block the signal! Soot
buildup will cause problems. If your fireplace burns anything but
gas, avoid putting your RAU in that location. If the chimney is fed
10
X

Introduction
4
only by residential gas appliances, then installing the RAU there
may be acceptable. Extend the mast a few feet above the chimney so
that hot gasses from the chimney don’t damage the antenna.
Seemingly hopeless situations
Sometimes there are situations
that you just can’t get around. In
that situation, do the best you can
do. At moderate latitudes
(between latitude 22 degrees and
52 degrees) there will always be
two satellites visible in the sky at
any location. That means if an object blocking the antenna’s view of
the sky is small (that is, blocks a small part of the sky), it should
never, or almost never, cause an outage. Good luck!

Safetyconsiderations
5
Step 1. Safety considerations
We recommend that installation, repair, and maintenance of the
QGFSP be performed by technically qualified service personnel; that
is, those selected and trained by the service provider or
QUALCOMM.
General
Warning
Failure to follow the warnings and instructions included in this
guide can lead to serious personal injury or death and possible
property damage.
Warning
Never insert objects through openings in the equipment.
Conductive foreign objects can produce a short circuit that
could cause fire, electrical shock, or damage to the equipment.
Warning
REGULATIONS. Installation of this QGFSP must meet the
local codes and regulations for lightning installation.
C
aution
Changes or modifications not expressly approved in this guide
could void the warranty for the QGFSP.
C
aution
There are no end-user serviceable parts. Repairs should be
made by the service provider or a QUALCOMM approved
repair center.
Caution
Before installing the equipment, remove jewelry and other
metallic objects from your person. These items can cause
electrical shock or burns.
Power
Warning
High current 12 volt power supplies and batteries can be
dangerous unless installed correctly. Install all cables and
wiring and complete all connections before applying power.
Never install or work with wires when power is connected.
Warning
Avoid any AC power lines that may be in the vicinity. Avoid
installing the RAU and its connecting cables in any location
where accidental contact with AC power lines may occur.
Batteries
Warning
Do not storeunsealed lead-acid batteriesinside thebuilding. If
the QGFSP is powered from an alternate source, such as a car
battery, the installer must provide suitable overcurrent
protection, as well as venting, to safely dissipate flammable
hydrogen gas that might leak from lead-acid car batteries.
Overcurrent protection must be certified and rated at least
20 VDC and no more than 3 A (amps).

Safetyconsiderations
6
Lightning
Warning
Even though a properly installed QGFSP includes grounding
and circuitry to help minimize damage to equipment, facilities,
and personnel from nearby lightning, lightning is a highly
unpredictable and dangerous phenomenon. It is impossible to
completely protect equipment and personnel from lightning
strikes. During electrical storms (thunderstorms):
❑Do not use the telephone
❑Do not connect a computer to the RAU for the purposes of
QGFSP service programming
❑Do not modify the QGFSP or related equipment
Warning
Inareasofseverelightningactivity,QUALCOMMrecommends
use of a separate primary lightning protection system, such as
a lightning rod, to protect the antenna unit and associated
equipment from lightning strikes. Failure to properly install
the QGFSP or to include a separate lightning protection system
may cause electrical shock, fire, or damage to equipment. See
Figure 27 for recommended installation in conjunction with a
lightning protection system.

Inventory
7
Step 2. Inventory
Check the contents of the QGFSP package
The RAU is a QUALCOMM-manufactured aluminum housing
containing Globalstar radio electronics and an integrated mast
antenna protruding from the top of the housing.
Two kits are available:
•Thebase kit contains the RAU, junction box, security module
(SM) card, a sighting tool, 10 crimp rings, a documentation
package, and a mounting kit. Note that when you purchase the
base kit, you must purchase other needed items.
•Theenhanced kit contains all items of the base kit, plus
telephone, cabling, power supply, and backup battery for the
power supply.
Base Kit
Items contained in the base kit are listed in Table 1.
Table 1. Base Kit
Item Description
One radio antenna unit (RAU) with
attached antenna.
Front view
Antenna
Radio unit
RAU
Access
cover
259AA_99
Back view
One junction box. The junction box
is the interface between the outside
cables and the inside telephone
wires.
Onesecuritymodule on acard.Ifthe
SM card was not installed in the
factory, the service provider should
supply one.
One sighting tool. Use this to
determine correct placement of the
RAU.
Ten crimp rings: five blue (16 to 14
AWG), four yellow (26 to 24 AWG)
and one blue (6 AWG). Use these
rings to connect cable to connectors
in the junction box.
Table 1. Base Kit
Item Description
780AA_1999Q
083AB_1999Q
411AB_1999Q.eps

Inventory
8
A mounting kit is shown in detail in Table 2. The mounting kit is
included with both kits.
A documentation package
containing an installation guide, a
user guide, and a quick reference
card. The user guide and quick
reference card should be given to the
user of the QGFSP.
A mounting kit, described in Table 2
on page 8.
Table 2. Mounting Kit
Item Description
One U bolt for use in mounting to a pipe.
Bolt accommodates pipe sizes ranging
from 38 mm (1.50 inch)
outside diameter (OD) to 48 mm
(1.90 inch) OD.
Two M6 x 60 mm pan head screws.
Table 1. Base Kit
Item Description
Globalstar
562AB_1999Q
U bolt
564AB__1999Q
Two M6 x 16 mm pan head screws.
One mounting bracket (A) and one
mounting clamp (B). Mounting clamp B
is used only when mounting the RAU to
a pole.
Two hex nuts. Used to lock U bolt in
place.
Flat washers. Sufficient for number of
screws enclosed.
Split lock washers. Sufficient for
number of screws enclosed.
Table 2. Mounting Kit
Item Description
563AB_1999Q
565AB_1999Q
Mounting
clamp B
Mounting
bracket A
566AB_1999Q

Inventory
9
Enhanced Kit
The enhanced kit includes all the items of the base kit, plus the items
shown in Table 3. These items can also be purchased separately.
One mounting bracket for mounting the
RAU to a wall.
Table 3. Enhanced Kit
Item Description
Fifteen meters (50 feet) of wiring to
connect the junction box to the RAU.
The wire can be shortened, if desired.
(included in kit)
QUALCOMM +12V power supply with
2.44 meter (8 foot) DC output line cord
(two line cords, one with a European
plug and one with a U.S. plug are
included in the kit)
Table 2. Mounting Kit
Item Description
781AA_1999Q
555AB_1999Q
553AB_1999Q
Backup battery for use with
QUALCOMMpowersupply. Thebackup
battery offers 3.5 hours talk and 24
hours of standby.
Telephone with phone cable and
RJ-11 connector.
Table 3. Enhanced Kit
Item Description
554AB_1999Q.eps
556AB_1999Q

Inventory
10
Make sure you have all supplies and equipment
Check to see which QUALCOMM kit you are installing. Depending
on the kit purchased, you may need additional items to complete the
installation.
Grounding Accessories
Grounding accessories available from electrical supply companies
are not included in the kit; however, they are required to ground the
RAU and junction box. Quantities required in a typical installation
are shown in Table 4. In addition, the installer should supply the
pole needed to support the RAU.
Note
If fabricating your own 15-meter (50-foot) cable for connecting
the RAU to the junction box, the cable must conform to
specifications given in Appendix B. Specifications for Cables.
Specifications for fabricating cables must be followed to avoid
damage or poor performance of the equipment and to avoid
invalidating your warranty.
Table 5 lists the wires and jacks recommended for use in installing
the interior wiring.
Table 4. Grounding Supplies
Type Quantity needed
#6 AWG copper primary ground cable Amount needed depends
on site
#6 AWG (pink) ground lug 1 each
#6AWGsolidcopper groundwire usedto
ground junction box 0.5 meter (1.6 feet)
Copper C-type compression tap (#6 to #6
wire) 1 each
2.7 to 3 meter (8 to 10 foot) ground rod 1 – length depends on soil
type
Copper clamp, #6 AWG wire to ground
rod, screw type 1 each
Bolts to secure grounding wiring to rod As needed
Wall mounting brackets and fittings If needed
RAU to junction box cable (provided by
QUALCOMM or the equivalent cable)
See Appendix B. Specifications for
Cables.
As needed. Not to exceed
15 m (50 feet).
Pole for mounting If needed
Cable ties As needed
Table 5. Interior wiring
Recommended item Quantity needed
Standard telco cable As needed to a maximum
of 182 meters (597 feet)
6-position modular jack, wall mount
(EIA-568 or EIA-520) RJ-11 As needed
Wiring boxes 1 each
Table 4. Grounding Supplies

Inventory
11
Table 6 lists sources for power supplies.
Table 7 lists the tools needed to complete the installation.
Table 6. Power Supply
Item Quantity needed
Power supply: 12 volt, 3 A. Possible
power sources that can be used are:
■Solar panel producing 12 VDC with
optional backup battery*
■Motorgenerator(2-wireterminalfor
12 VDC)
■AC to DC converter operating at 100
to 240 VAC, 50/60 Hz with 12 V DC
output
Select one.
*For solar power, QUALCOMM recommends SunWize™. Their
products have been tested. They are considered suitable for use with
QUALCOMM’s QGFSP.
Table 7. Tools
Item Quantity needed
Tools for installation
■Crimping tool
■Phillips screwdriver (#2)
■Torque wrench
■Cable ties
■Needle-nose pliers
■Socket wrench set, metric and
English sockets
■Bubble level
■Plumb line
As needed
Mounting hardware for junction box:
wood and metal screws with nuts and
bolts
As needed

Plan where to position the components
12
Step 3. Plan where to position the
components Determine where to position the QGFSP components and decide
which mount is best suited to the current work site. Be certain that
the RAU antenna has a clearview of the sky, that you have provided
adequate grounding, and that you have the correct number and
lengths of cable.
• Two recommendedmounting configurations are shown in Figure
2 and Figure 3. A poor choice for mounting isshown in Figure 4.
Note that in the figure, reception is blocked both by building and
by tree.
• Use the sighting tool to help determine whether there are
obstructions to satellite reception. (See page 13 for instructions.)
• Plan how to ground the QGFSP. If there is an existing lightning
protection system, see Figure 27 on page 38 for how to install the
QGFSP.
• Position the junction box on the outside of the building, near
where the inner telco wires meet the outside, and close to the
grounding rod.
• Becertainthatcablelengthswillbeadequate.Recommendations
are on page 14.
Figure 2. Roof mounted RAU
Figure 3. Pole mounted RAU
RAU
Building
Grounding wire
Grounding wire
Junction box 8 foot ground rod
(No more than 3.5 m
from Junction box)
257AA_99
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123
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®
QCT-1000
456
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QCT-1000
456
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*
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®
QCT-1000
456
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123
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®
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RAU cable
Telephones
Grounding wire
RAU cable
Key
10 10
Reception zone
054AB_9
9
RAU
10 10
RAU
cable
RAU
cable
Building
Ground wire
Junction box 8 foot ground rod
(No more than 3.5m
from Junction box)
456
789
123
*
0#
®
QCT-1000
456
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Ground
wire
Telephones
Grounding wire
RAU cable
K
ey
Reception zone
Figure 4. Incorrect placement of RAU
551AB_1999Q
RAU
10 10
RAU
cable
Building
Ground wire
Junction box 8 foot ground rod
(No more than 3.5m
from Junction box)
456
789
123
*
0#
®
QCT-1000
456
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123
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456
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123
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QCT-1000
456
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123
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QCT-1000
Ground
wire
Telephones
Grounding wire
RAU cable
Key
Reception zone

Plan where to position the components
13
How to use the sighting tool
The sighting tool is included in the basic kit to give you an easy
method of determining 10 degrees over the horizon. To use the
sighting tool:
1. Position the RAU in its desired location.
2. Place the sighting tool over the antenna, allowing it to slide to the
bottom of the antenna.
3. If the antenna is in a vertical position, the flat plate will be at a
10 degree angle. With the lower end of the sighting tool closest
to your eye, sight along the flat plate and note what you see over
the upper end of the plate.
4. Rotate the sighting tool in a full circle to ensure there is a clear
view of the sky in every direction. Anything you see above the
upper end of the plate will be in the way of satellite signals.
5. When finished, remove the sighting tool.
Figure 5. Sighting Tool Figure 6. Locating possible obstructions
In this case, there is a wall obstructing the view.

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
premisesandallcablingdesignedforuse outdoorsis keptoutside
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)
— Thejunctionboxshouldbepositionedclosetothegroundrod.
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.

Plan where to position the components
15
Power Source
The power sourceis determined by the service provider orthe service
provider’s representative. Possible power sources are:
• Power supply producing 12 VDC with backup battery such as a
ACto DC converteroperating at 110Vto220VAC,50/60Hz,with
12 VDC nominal output, capable of sourcing at least 3 A.
• Solar panel producing 12 VDC (nominal) with optional backup
battery and capable of sourcing at least 3 A.
• Motor generator (2-wire terminal for 12 VDC), with 3 A output
source capability.
Note
QUALCOMM recommends using the shortest length of wire
practical between the power supply and the RAU to keep
voltagedropbetweenthepowersupplyandRAU toa minimum,
particularly if the supply voltage is closer to 10.5 volts.
Regardlessofwirelength,the installermust ensure thatsupply
voltage is not less than 10.5 volts or more than 16 volts at the
junction box. The RAU draws a load that varies between 0 and
3A.
If the installer uses the 15 meter (50 foot) RAU to junction box
cable provided with the enhanced kit, and the power supply
maintains an output of at least 10.5 volts, then proper voltage
at the RAU is assured.