Ensemble Communications ODU-2800-002 LMDS Base Station Transceiver User Manual Preinstallation

Ensemble Communications Inc. LMDS Base Station Transceiver Preinstallation

Preinstallation

3
Ensemble Communications Inc.
Preinstallation 3
This chapter gives checklists and guidelines for preinstallation
of Fiberless System hardware.
Note When updating or building facilities to accommodate Ensemble
equipment, observe all building codes and regulations.
Chapter Topics Ancillary Equipment 3-10
Antenna Screening 3-5
Antenna Separation for Asynchronous Transmission 3-6
Antenna Separation for Synchronous Transmission 3-6
Installation Requirements 3-3
Installation Tips 3-4
Licenses and Permits 3-2
Location Guidelines 3-2
Multiple Antenna Configuration 3-6
ODU Guidelines 3-4
Power Requirements 3-3
Roof Penetration 3-5
Site Preparation 3-2
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Operator’s Guide to the Fiberless System
Site Preparation
Site preparation time varies, depending on the particular site. For
example, installation in a new location may require building
modifications, while an existing building would not.
Licenses and Permits Verify all licensing and permit issues. Such issues may include:
• Import/export licenses for the site country
• Radio licenses, both station license and frequency license
Other permits may also be required, depending on location. Some
typical examples include:
• Landlord approval of plans for the pending construction
• Construction permits
• Electrical permits
• Zoning or use permits for the proposed facility and examina-
tion of possible impact on neighboring areas
Note When placing antennas near airports, it may be necessary to obtain
authorization from the appropriate aviation authorities.
Location Guidelines • Verify that the selected locations are accessible to installers and
equipment.
• Verify that all utilities and services, including AC power, are
available.
• Verify that lightning protection and grounding systems are
available and comply with local building codes.
• If prime AC power needs to be installed, use a licensed electri-
cal contractor. Verify all components are installed in accordance
with local electrical codes.
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Preinstallation
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Installation
Requirements Size and access
The base station chassis mounts in a standard 19-inch (48-cm) rack
or cabinet and requires 10 rack units (RUs) of space (17.5 inches (44
cm)), 24 inches (60 cm) deep. Allow adequate clearance around the
base station to permit access for installation of cards, assemblies,
and modules. Verify there is sufficient room to route and attach
cables to the rear of the unit. The unit requires clearance of at least
30 inches (76 cm) in the front and 24 inches (60 cm) in the rear.
Floor loading
A fully equipped base station cabinet with a -48 VDC power
system and batteries can weigh up to 800 pounds (360 kg). Verify
the cabinet and power plant do not exceed the floor loading limits.
Temperature allowances
Verify the indoor location meets the following temperature
allowances, including ventilation enough to dissipate heat loads of
up to 1750 watts per fully equipped base station chassis:
Storage -40° to 60° C (-40° to 140° F)
Operation 0° to 50° C (32° to 122° F)
Recommended 10° to 30° C (50° to 86° F)
Power Requirements The base station requires a -48 VDC power source, which can be
supplied by either a -48 VDC power distribution system or a local
-48 VDC power supply. The local power source should be capable
of supplying a minimum of 50 amps.
For redundancy, each base station chassis requires two power bus
connections (A and B). These connections are on the backside of
the chassis in the Power Distribution Frame (PDF).
Note The 50 amp power supply requirement is based on the power required
for a single chassis, fully populated, in an ATM configuration.
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Operator’s Guide to the Fiberless System
Installation Tips Installers are responsible for determining the proper attachment
method. The following are suggestions regarding cabinet and rack
installations.
WARNING
Do not place any equipment in the cabinet or rack without
first securing it to the floor.
•For concrete floors, use threaded rods with washers and nuts
or the proper length and diameter machine bolts with concrete
insert anchors.
•Move the cabinet or rack into position and mark the attach-
ment location in each corner on the floor. Move the cabinet or
rack out of the way, then drill the appropriate size hole in the
floor for the anchor being used.
•Install four anchors into the floor following manufacturer
instructions.
•Vacuum the floor to remove all dust and debris.
•Move the cabinet or rack back into place and secure the four
corners.
ODU Guidelines •Verify that the mounting mast was installed according to con-
struction drawings and local construction codes and practices.
Mounting masts are typically a section of 2-inch (5 cm) to
4-inch (10 cm) pipe.
•Verify cable route from the base station or CPE to the ODU. It
can be no longer than 1,000 feet (300 meters). This may be a
duct or conduit. If required, install a dedicated conduit
between the ODU and base station location. A 1-inch (2.5 cm)
to 2-inch (5 cm) conduit is recommended, depending on the
number of ODU cables being installed.
•Install a ground plate and lightning suppressor at the building
entry point and at the ODU.
•Prepare all mounting hardware for the base station.
•Verify the power system and wiring for the base station,
including the cabling, grounds, circuit breakers, and fuses.
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•For safety and performance, mount ODUs at least seven feet
(2.1 meters) above the roof so people are able to walk on the
roof without interfering with the antenna’s beam. Clearance
should also be adequate enough to permit the following activi-
ties:
•Antenna unit installation and maintenance
•Antenna alignment
•Window washing
•HVAC maintenance
•Maintenance of other antennas
Antenna Screening Some building owners or local regulations require that antennas be
hidden from view. In such cases, consider the attenuation
characteristics of the material being used to hide the antennas
when calculating paths. Consider factors such as the angle of
incidence between the antenna and the screening material as well
as the antenna’s polarization.
Roof Penetration If installation of antenna unit cables or antenna unit mountings
requires penetrating a roof, engage only contractors familiar with
accepted practices for ensuring weather-tight seals to make the
penetrations. This issue is of particular concern when installing on
buildings with a continuous roofing membrane.
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Operator’s Guide to the Fiberless System
Multiple Antenna Configuration
In multiple antenna configurations, each sector must be separated
by a prescribed space to prevent interference from adjacent sectors.
The size of this space depends primarily on the amount of
interference a sector’s receiver can tolerate and whether the sectors
are operating synchronously or nonsynchronously.
Antenna Separation
for Synchronous
Transmission
For configurations using synchronous transmission (that is, each
sector associated with a base station transmits at the same time and
receives at the same time), multiple sectors must be separated by at
least 0.5 meters (1.65 feet) vertically and horizontally (see
Figure 3-1 and Figure 3-2).
Antenna Separation
for Asynchronous
Transmission
For configurations using asynchronous transmission (that is, some
sectors may be transmitting simultaneously while others are
receiving), multiple sectors must be attenuated so the receiver’s
SNR does not fall below the minimum level required to
demodulate the signal. Based on the horizontal antenna patterns
for the Andrew BCA Mark II antenna, Table 3-1 provides minimal
horizontal spacing to isolate sectors that are separated by one, two,
three, and four channels from each other. For distances within the
near field range, the antennas act as radiating point sources
Table 3-1: Minimum Horizontal Spacing for Nonsynchonous Sectors
Antenna
Beam
Width in
Degrees
Angular
Separation
in Degrees
N+1
Spacing
(Meters/
Feet)
N+2
Spacing
(Meters/
Feet)
N+3
Spacing
(Meters/
Feet)
N+4
Spacing
(Meters/
Feet)
45 0 20.33 3.57 0.36 0.36
45 45 20.33 3.57 0.36 0.36
45 90 20.33 3.57 0.36 0.36
45 180 20.33 3.57 0.36 0.36
60 0 20.33 3.57 0.36 0.36
60 60 20.33 3.57 0.36 0.36
60 90 20.33 3.57 0.36 0.36
60 120 20.33 3.57 0.36 0.36
60 180 20.33 3.57 0.36 0.36
90 0 79.80 3.57 0.36 0.36
90 45 20.33 3.57 0.36 0.36
90 60 20.33 3.57 0.36 0.36
90 90 20.33 3.57 0.36 0.36
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Figure 3-1, Figure 3-2, and Figure 3-3 show recommended spatial
separation for various multiple-antenna mounting scenarios.
Figure 3-1. Two Antennas with a Single Mounting Pole
90 180 20.33 3.57 0.36 0.36
Table 3-1: Minimum Horizontal Spacing for Nonsynchonous Sectors
Antenna
Beam
Width in
Degrees
Angular
Separation
in Degrees
N+1
Spacing
(Meters/
Feet)
N+2
Spacing
(Meters/
Feet)
N+3
Spacing
(Meters/
Feet)
N+4
Spacing
(Meters/
Feet)
Min. 0.5 Meters
Assumptions:
Gain at +/-90° vertical is –10 dBi
Perfect vertical alignment
Skirt from Interferer limited to –94
dBm beneath threshold of –93
dBm for QAM64.
For synchronous transmission,
D=0.5 m (1.65 ft)
D
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Operator’s Guide to the Fiberless System
Figure 3-2. Proper Mounting of Two Antennas on Separate Poles
Figure 3-3. Minimum Angle Separation
Use Table 3-2 and the following figures to calculate roof-mount
requirements to clear the first Fresnel zone for nearby obstructions.
D
Channel
NChannel
N+2
Assumptions:
Antennas pointed in parallel
Minimum of two channels
separation
Spacing dependent on
modulation rate and antenna
beam width
·See Table 3-1 for horizontal
separations for
nonsynchronous transmission.
Separation for synchronous
transmission is 0.5 m (1.65 ft).
D
Channel
N
Channel
N+2
Assumptions
Antennas separated by
angle D
Spatial separation D
Minimal angle and
separation dependent on
modulation rate and
antenna beamwidth
See Table 3-1 for
horizontal separations for
nonsynchronous
transmissions.
Table 3-2: Minimum Roof Clearance
Frequency D1 (meters) Minimum R (cm)
24 1 ~0
24 10 1.12
24 100 3.53
41 1 ~0
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Figure 3-4. Roof-mount Clearance Requirements
41 10 0.85
41 100 2.70
Table 3-2: Minimum Roof Clearance
Frequency D1 (meters) Minimum R (cm)
R
D1
Building Roof or Support Surface
Parapet
ODU
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Operator’s Guide to the Fiberless System
Ancillary Equipment
Note Although Ensemble recommends manufacturers, the Fiberless System
supports most standard-manufactured ancillary equipment.
Table 3-3: Ancillary Equipment Requirements
Equipment Recommendation or
Requirement Manufacturer and
Part Number
Required ODU cables Standard cable – RG-6 Part No. Belden 9248
Plenum Cable – RG-6
Not suitable for outside use
Part No. Belden 82248
Required ODU connectors TNC crimp connector for
Belden 9248 cable
Trompeter Electronics
Part No. UPL 240-020
TNC crimp connector for
Belden 82248 cable
Trompeter Electronics
Part No. 105-1457-10
Connector crimp tools TNC crimp tool Trompeter Electronics
Part No. CT4L
TNC crimp tool die Trompeter Electronics
Part No. CD3-3
8 point center pin tool Trompeter Electronics
Part No. 010-0055
Lightning suppressors Suppressor Kit – Outdoor
Unit
PolyPhaser
Part No. 097-0619T-B.3
Suppressor – Indoor Unit PolyPhaser
Part No. 097-0619T-B.4
Mounting Plate (12 indoor
units)
PolyPhaser
Part No. 100-0501S-A
Base station power
supply– 48 VDC 50 Amps
(depending on
configuration)
Telephony-type modular
power systems
Power Conversion
Products Twin-pack Plus
series
CPE power – 120 VAC Protection: small UPS
(Uninterruptible Power
System)
APC
Racks 19-inch or 23-inch. Any manufacturer
Base station routers DS-3 ATM interface and
fast Ethernet card
Cisco 7200 series
CPE routers v.35 interface Cisco 1601R
Dual 10BaseT ports Cisco 1605R
Tower mounts 2-4-inch pipe
Wall mount available
Microflect; Andrews, Tower
Structures

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