Huawei Technologies RRU3702-2500 Remote Radio Unit User Manual Installation Guide
Huawei Technologies Co.,Ltd Remote Radio Unit Installation Guide
Contents
- 1. Installation Manual
- 2. Installation Guide
Installation Guide
HUAWEI TECHNOLOGIES CO., LTD.
SingleRAN WiMAX-LTE
V100R001C00
Quick Installation Guide
(Co-RRU3702)
Issue: XX
Date: 2011-XX-XX
1
Installation Tools
Installation Scenarios
Requirements for Dimensions and Installation Space
Installation Procedure
Installing the BBU3900
Installing the RRU
Connecting Cables
Installing BBU3900 Cables
Installing RRU3702 Cables
Installing the Outdoor Cable Transfer Box
Measuring the VSWR of the Antenna System
Installation Checklist for the BBU
Installation Checklist for the RRU
Checklist for the Project Implementation
Appendix
Contents
Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.
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2
Installation Tools
Multimeter
Utility knife
Hammer drill (with bit 14) Vacuum cleaner
ESD gloves
Heat gun
Flat-head screwdriver
(M3 to M6)
Wire stripper
Wire cutter
Adjustable wrench
[with a diameter of at least
32 mm (1 1/4")]
Torque screwdriver
Measuring tape
Level
Marking pen
[with a diameter of no more
than 10 mm (0 3/8")]
Combination wrench
Phillips screwdriver
(M3 to M6)
Torque wrench
Crimping pliers
Rubber mallet
[21 mm (0 13/16") to 21 mm (0 13/16")]
for pole installation
[17 mm (0 11/16") to 17 (0 11/16")]
for wall installation
3
Installation Scenarios
bRRU3702 Installation Scenarios
BBU3900 Installation Scenarios
In a 19-inch indoor rack
On a pole On U-steel
On angle steel
On a wall
On a wire pole
a
zA cabinet must be powered on within seven days after being unpacked, and cannot be kept in the power-off
status over 48 hours during maintenance.
zA module must be powered on within 24 hours after being unpacked or after being powered off for maintenance.
In an APM30H In a TMC11H In an OMB
For details about the installation of the APM30 and the TMC11H, see the APM30H Installation Guide.
BBU
BBU
BBU
BBU
4
Requirements for Dimensions and Installation Space
Dimensions
Dimensions of the RRU3702 with a shell:
484 mm (1'-7 1/16'') x 374 mm (1'-2 3/4'') x 158 mm (6 1/4'')
Dimensions of the RRU3702:
480 mm (1'-6 7/8'') x 356 mm (1'-2'') x 120 mm (4 3/4'')
a
356 mm (1'-2'') 120 mm (4 3/4'') 158 mm (6 1/4'')374 mm (1'-2 3/4'')
484 mm
(1'-7 1/16'')
480 mm
(1'-6 7/8'')
310 mm (12 3/16'')
86 mm (3 3/8'')
442 mm (1'-5 3/8'')
Dimensions of the BBU: 442 mm (1'-5 3/8'') x 310 mm (1'-0 3/16'') x 86 mm (3 3/8'')
Space Requirements for the BBU3900 Installation
In a 19-inch rack
b
70 mm (2 3/4'')
25 mm
(1'')
25 mm
(1'')
5
≥500 mm (1'-7 11/16'')
≥800 mm
(2'-7 1/2'')
≥600 mm
(1'-11 5/8'')
Installation Space
c
300 mm (11 13/16'')
100 mm
(3 15/16'')
600 mm
(1'-11 5/8'')
400 mm
(1'-3 3/4'')
The minimum installation space meets the requirements of
the equipment for normal running and heat dissipation, but
does not meet the requirements for OM such as checking
the status of the indicators and opening the maintenance
cavity. When the installation space is restricted, the
minimum installation space can be adopted.
The recommended installation space meets the
requirements of the equipment for normal running and
OM. When the installation space is sufficient, the
recommended installation space can be adopted.
200 mm (7 7/8'')
≥300 mm
(11 13/16'')
≥300 mm
(11 13/16'')
≥300 mm (11 13/16'') 200 mm (7 7/8'')
Recommended space for RRU3702 installation Minimum space for RRU3702 installation
Recommended horizontal space for
RRU3702 installation Minimum horizontal space for
RRU3702 installation
Recommended vertical space for
RRU3702 installation Recommended vertical space for
RRU3702 installation
≥600 mm
(1'-11 5/8'')
≥600 mm
(1'-11 5/8'') 100 mm
(3 15/16'')
400 mm
(1'-3 3/4'') 400 mm
(1'-3 3/4'')
≥300 mm (11 13/16'')
≥500 mm (1'-7 11/16'')
≥500 mm (1'-7 11/16'')
300 mm (11 13/16'')
300 mm (11 13/16'')
6
Installation Procedure
7
Installing the BBU3900
aInstalling the BBU3900 in a 19-Inch Rack
b
Reversely installed
mounting ears
Installing the BBU3900 in an APM30H
a. Verify that the BBU3900 mounting ears are regularly
installed in a 19-inch rack, and are reversely installed
in an APM.
b. Install the BBU3900 in an
APM30H using a binding bracket.
Reversely
installed
mounting ears
Bounding
bracket
Regularly installed mounting ears Reversely installed mounting ears
For easy installation, remove the two ground
screws on the right side of the BBU panel before
installing the BBU.
Regularly installed
mounting ears
BBU
M6X16
2 N.m
(17.70 lbf.in.)
M6X16
2 N.m
(17.70 lbf.in.)
8
eInstalling the BBU3900 in an OMB
cInstalling the BBU3900 in a TMC11H
BBU3900
Reversely installed
mounting ears
FAN
Reversely installed
mounting ears
M6X16
2 N.m
(17.70 lbf.in.)
M6X16
2 N.m
(17.70 lbf.in.)
Remove the two ground screws on the right side of
the BBU panel before installing the BBU.
9
Tighten the
screws when
installing the
RRU. Loosen
these screws
when removing
the RRU.
Installing the RRU
aInstalling the RRU on a Pole
[Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]
zThe RRU must be supported by foam or cardboard for protection.
zThe RF ports at the bottom of the RRU cannot bear the weight of the RRU. Do not place the RRU on the
ground in the upright position.
Dual-nut bolt
Main bracket
Auxiliary bracket
1200 mm (3'-11 1/4'')
to 1600 mm (5'-3'')
When installing the
main bracket,
ensure that the
contact piece on
the bracket is fixed.
You may fit one end of the auxiliary bracket on one dual-nut bolt assembly and then the other end on the
other dual-nut bolt assembly during the installation.
1. Install the main bracket.
60 mm (2 3/8'') to 114 mm (4 1/2'')
The recommended diameter of the pole is 80 mm (3 1/8").
Mounting brackets for RRU
Fixing
hoop
Logo on the cover plate Transfer pieces Tighten the screws when
removing the RRU.
Main bracket
Spring plate
≤10°
RRU
Angle steel
or U-steel
The angle between
the vertical and the
angle steel or U-
steel or angle steel
where the RRU is
installed must be
less than or equal
to 10 degree.
10
Installing Two RRUs on a Pole
[Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]
b
Tighten the two dual-nut bolt assemblies
alternatively. After the brackets are secured,
use a measuring tape to measure the spacing
between the main bracket and the auxiliary
bracket on two sides and confirm that the
spacing is the same.
2. Use an adjustable wrench to tighten the nut until the fastening torque is 40 N.m
(354.03 lbf.in.). This secures the main and auxiliary brackets to the pole.
3. Install the RRU on the main bracket. When you hear click sound, the RRU is
securely installed.
The arrows on the main
bracket point upwards.
1. Install the first RRU. 2. Install the second main bracket.
40 N.m
(354.03 lbf.in.)
11
Ensure that the cabling
cavities of the two RRUs
face the same direction
when installing the RRUs.
4. Install the second RRU on the main bracket.
3. Swap the front cover and the transitional piece at the rear of the
second RRU.
5 N.m
(44.25 lbf.in.)
M6X16
Cabling cavity
In standard mode
In reverse mode
zThe process for installing the RRU on U-steel is the same as the procedure for
installing the RRU on a pole.
zYou are advised to install only one RRU on U-steel.
Top views of four installation modes
cInstalling the RRU on a U-Steel
50 mm (1 15/16'') to
100 mm (3 15/16'')
30 mm (1 3/16'') to
50 mm (1 15/16'')
U-steel
12
Top views of the installation modes
dInstalling the RRU on Angle Steel
Angle steel
63 mm (2 1/2'') to
80 mm (3 1/8'')
63 mm (2 1/2'') to
80 mm (3 1/8'')
You are advised to install only one RRU on a wire pole.
eInstalling the RRU on a Wire Pole
[Diameter: 300 mm (11 4/5'') to 390 mm (1' 3 3/8'')]
zThe process for installing the RRU on angle steel is the same as the
procedure for installing the RRU on a pole.
zYou are advised to install only one RRU on angle steel.
Main bracket
35N•m
(309.78 lbf.in.)
13
128 mm(5 1/16'')
123 mm
(4 13/16'')
RRU
1200 mm (3'-11 1/4")
to 1600 mm (5'-3")
fInstalling the RRU on a Wall
Auxiliary bracket
123 mm
(4 13/16'')
When the RRU is installed on a wall, the requirements are as follows:
zFor one RRU, the wall has a weight-bearing capacity of 68 kg (149.94 lb).
zThe torque for tightening the expansion bolt is 30 N.m (265.52 lbf.in.). This ensures that the expansion bolts
are secured to the wall without causing damage to it.
Ø14
After the expansion bolt is removed,
dispose of the plastic tube.
90°
55 mm to 60 mm
20 mm (13/16") to 30 mm (1 3/16")
M10x65 bolt
Spring washer 10
Plastic tube
Flat washer 10
Expansion tube
Do not hammer the bolt
entirely into the wall.
Leave 20 mm (13/16")
to 30 mm (1 3/16") of
the bolt outside the wall.
2. Drill holes at the anchor points and then install the expansion bolt assemblies.
It is recommended that the auxiliary bracket be 1200 mm (3'-11 1/4") to 1600 mm (5'-3") above the ground.
1. Place the auxiliary bracket in the installation position against the wall. Then, level
the auxiliary bracket with a level and mark the anchor points with a marker.
14
Arrows point upwards
30 N.m
(265.52 lbf.in.)
M10
3. Fit the auxiliary bracket on the expansion
bolts downward, and then tighten the bolts by
using a combination wrench with a diameter of
17 mm (11/16").
4. Install the main bracket.
5. Install the RRU.
15
Connecting Cables
aCable Connections in General (RRU3702)
RS485 port
External
power
supply
system
Optical fiber
Ethernet cable
To a
Boolean
sensor
Connected through the optical
fiber or Ethernet cable
RRU power cable
CPRI optical fiber
BBU power
cable
zThe LMPTb, LMPTw, LBBPc, UPEUc, and FANc are used as examples.
zRRU3702s of a WiMAX-LTE BS in co-RRU mode supports only the chain topology.
zAn LBBPc provides six CPRI ports. However, only the CPRI0, CPRI1, and CPRI2 ports are used
in the typical configurations of a WiMAX-LTE BS in co-RRU mode.
zConfigure the DCDU based on onsite situations.
DCDU
Configuration Type：WiMAX: S(2/2/2), 2T2R, 10M Hz
LTE:S(1/1/1), 2T2R, 20M Hz WiMAX LTE
2C 1C
C=carrier,1C=1carrier,2C=2 carrier
A
N
T
A
N
T
A
N
T
A
N
T
A
N
T
A
N
T
Color-
coding
ASN-GW
16
DCDU
WiMAX LTE
2C 1C
C=carrier,1C=1carrier,2C=2 carrier
RS485 port
Optical fiber
Ethernet cable
To a
Boolean
sensor
Connected through the optical
fiber or Ethernet cable
RRU power cable
CPRI optical fiber
BBU power
cable
Configuration Type：WiMAX: S(2/2/2), 4T4R, 10M Hz
LTE:S(1/1/1), 4T4R, 10M Hz
ANT
Color-
coding
External
power
supply
system
ANT ANT
ASN-GW
17
DCDU
WiMAX LTE
1C 1C
C=carrier,1C=1carrier
RRU power cable
BBU power
cable
Configuration Type：WiMAX: S(1/1/1), 4T4R, 10M Hz
LTE:S(1/1/1), 4T4R, 20M Hz
ANT ANT ANT
CPRI optical fiber
RS485 port
To a
Boolean
sensor
Optical fiber
Ethernet cable
Connected through the optical
fiber or Ethernet cable
ASN-GW
External
power
supply
system
Color-
coding
18
bCable Connections of the OMB
OMB PGND cable
FE cable
AC input power cable
CPRI optical fiber
Monitoring cable between the
monitor board and the UPEU
Input power cable of the BBU
Monitoring cable between the
EPS30-4815 and the monitor
board
Before installing cables, you need to remove the waterproof module. Then, install the cables according to
the cable layout principle of installation holes at the bottom of the cabinet—clipping the cables. After
installing all the cables, place the waterproof module in the original position.
ac
BBU power cable
19
•The BBU PGND cable is yellow and green
or green. The cross-sectional area of the
PGND cable is 6 mm2(0.009 in.²).
•Connect one end terminated with an OT
terminal or a two-hole OT terminal (M4) to
the BBU. Connect the other end terminated
with an OT terminal to the ground bar.
•Prepare the PGND cable at the site.
•The BBU in the APM30H, TMC, or OMB is
grounded using mounting ears.
Installing BBU3900 Cables
aInstalling the BBU3900 PGND Cable
bInstalling the -48 V DC Power Cable of the BBU3900
BBU PGND cable Two-hole OT terminal
OT terminal
BBU
BBU
BBU
DCDU
APM30H TMC11H
BBU
DCDU-03B
Connect the DCDU-03B and the BBU using the LOAD6 or
LOAD7 port, with a priority of LOAD6 > LOAD7.
Connect the DCDU-03C and the BBU using the LOAD6 port.
20
dInstalling the Power Cable Between the BBU3900 and the TMC11H
eInstalling the Power Cable Between the BBU3900 and the OMB
PWR
LOAD1 10A
OMB
PWR
cInstalling the Power Cable Between the BBU3900 and the APM30H
21
Installing the FE/GE Ethernet Cable or Optical Fibers
f
ASN-GW
Optical fiber Ethernet cable
BBU3900
Ethernet cableOptical fiber
Install swappable
optical modules
zUse either the Ethernet cable or optical fiber to connect
the transmission equipment or gateway.
zInstall swappable optical modules before installing optical
fibers. The performance of an optical module that is
exposed to the air for more than 20 minutes may be
abnormal. Therefore, you must insert an fiber optic cable
into an unpacked optical module within 20 minutes.
zConfirm that the FE/GE Ethernet cable is a shield
straight-through cable.
Ground the shield layer of an FE/GE Ethernet cable if an FE/GE Ethernet cable is used in an APM30H or
TMC11H. For details about the grounding, see the description below.
ground clip
Install a ground clip on an FE/GE Ethernet cable at proper position
within 1 m (3'-3 3/8") from the cabinet cable outlet.
1.Determine the position for grounding the FE/GE Ethernet cable, and
strip off a sheath of about 25 mm (0 1") to expose the shield layer.
2.Loosen the screws on the ground clip, and route the FE/GE cable
through the clip.
3.Confirm that the shield layer of the FE/GE Ethernet cable is in full
contact with the ground clip, and tighten the screws on the clip.
22
gInstalling CPRI Optical Fibers Between the BBU3900 and the RRU3702
RRU3702
hInstalling a GPS Clock Signal Cable
RRU3702 RRU3702
WiMAX
LTE
WiMAX
zInstall swappable optical modules before installing optical fibers. The performance of an optical module that
is exposed to the air for more than 20 minutes may be abnormal. Therefore, you must insert an fiber optic
cable into an unpacked optical module within 20 minutes.
zConnect the longer exposed end of the optical fiber to the BBU and wrap the end with a tube, and connect
the shorter exposed end to the RRU.
CPRI optical fiber
Install hot-swappable
optical modules.
When the BBU3900 is installed in a 19-inch
cabinet, ground the surge protector. Confirm that
the ground cable is less than or equal to 300 mm
(11 13/16") with a cross-sectional area of 6 mm2
(0.01 in.2), and that both ends are terminated with
an OT terminal respectively.
SMA male
connector
Type N female
connector
GPS clock signal cable
Surge protector
on the
equipment side
Protect
Surge
GPS antenna
BBU3900
GPS clock
signal cable
SMA
T-connector
The installation of an SMA T-connector is for
reference only.
LTE
WiMAX LTE
WiMAX LTE
WiMAX
23
b. In an OMB
1.Install an SMA T-connector.
2.Install a surge protector.
Surge protector
SMA male connector
zInstall a T-connector inside a cabinet and
secure it nearby based on the cable layout.
zWrap the T-connector joints with PVC
insulation tape.
a. In an APM30H
SMA T-connector
Surge protector
24
kInstalling the Monitoring Signal Cable Between the BBU3900 and
CMUA (APM30H, TMC11H)
Installing the Monitoring Signal Cable Between the BBU3900 and the
EMUA
Monitoring signal cable between
the BBU and the EMUA
j
This cable connection scenario is not
applicable to the APM30H, TMC11H,
or OMB.
EMUA
MON1
APM30H TMC11H
APM30H
TMC11H
25
lInstalling the Monitoring Signal Cable Between the BBU3900 and the OMB
MON1
RS232/RS485
COM OUT COM IN
zThe MON1 port on the BBU3900 is connected to the COM
IN port on the OMB using an alarm signal cable.
zThe RS232/RS485 port on the AC/DC power module is
connected to the COM OUT port on the OMB using a power
monitoring signal cable.
RRU
DCDU
LOAD0
NEG0(-)
RTN0(+)
26
Installing RRU3702 Cables
aInstalling the RRU3702 PGND Cable
RRU PGND cable
16 mm2 (0.02 in.²)
Two-hole OT terminal
OT terminal
bInstalling the RRU3702 Power Cable
Ground point for
the shielding
layer of the
power cable
zThe cross-sectional area of the RRU PGND cable (green
and yellow or green) is 16 mm2(0.02 in.2) (6AWG).
zOne end connected to the RRU is terminated with an OT
terminal (M6) and the other end connected to the ground
bar is terminated with a two-hole OT terminal.
zConnect the DCDU-03B and the RRU using
the LOAD0 or LOAD5 port, with a priority of
LOAD0 > LOAD5.
zWhen the BBU and RRU are used indoors,
do not ground the RRU power cable.
zThe RRU power cable must be grounded if
an RRU is installed outdoors. For details, see
the appendix.
zFor details about how to prepare an OT
terminal, see the appendix.
Bent OT terminal:
RRU power
cable
4.8N•m
(42.48 lbf.in.)
M6
27
1.4N•m
12.39 lbf.in.
M4
Fill vacant cable holes in the cabling
cavity using waterproof blocks.
Installing CPRI Optical Fibers
For details, see "Installing CPRI Optical Fibers Between the BBU3900 and
the RRU3702" on page 22.
c
Close the cabling cavity.
Precisely follow the instructions on the
cover plate on the cabling cavity and the
installation guide when preparing the
cable.
Cover plate
Cabling
cavity
Shielding layer
Remove the sheath
and shielding layer of
the cables based on
the lengths.
Remove the sheath of
the cores.
Add an OT terminal to
each core.
Remove 15 mm (0
9/16'') of the power
cable sheath to expose
the shielding layer.
1.OT terminal for RRU power cable
Lengths for preparing
the RRU power cable
NEG (-)
RTN (+)
-48 V DC power cable
OT terminal
2. To prepare the OT terminal for the RRU power
cable, perform the following steps:
Determine the lengths of
different power cables
based on information on
the cover plate of the
cabling cavity.
Waterproof block
28
dInstalling the RF Jumper of the RRU3702
Connections between the 4T4R RRU and the 4-port antenna
Identify the RF ports. The names of the RF
ports are silk screened above the port.
Connect the jumpers based on the
connection relationship shown in the figure
above.
Wrap a layer of insulation tape
Wrap three layers of waterproof tape
Wrap three layers of insulation tape
Secure the connector to the port using a
wrench [torque: 1 N.m (8.85 lbf.in.)]. Wrap the
connector with insulation tape and with
waterproof tape.
Before installing the RF jumper, measure the VSWR of the antenna
system. For details, see "Measuring the VSWR of the Antenna System"
on page 29.
Installing the RF jumper
Take insulation and waterproof measures only for the RF jumpers
connected to outdoor RRUs.
ANTENNA
RRU
RF jumper
Waterproof tape
Dustproof
cap
PVC insulation tape
Keep the dustproof caps on vacant feeder connectors.
Wrap the feeder connectors with waterproof tape for
outdoor scenarios, as shown in the following figure.
PVC insulation tape
ANTA_TX/RX ANTB_TX/RX ANTC_TX/RX ANTD_TX/RX
29
Installing the Outdoor Cable Transfer Box
Measuring the VSWR of the Antenna System
zWhen the distance between the RRU3702 and the DCDU or APM30H ranges from 6 m
(19'-8 1/4'') to 180 m (59'-6 5/8''), install an outdoor cable transfer box on the RRU side.
zThe core area of the power cable between the outdoor cable transfer box and the DCDU
or APM30H is 10 mm² (0.02 in.²).
zThe core area of the power cable between the outdoor cable transfer box and the RRU is
3.3 mm² (0.005 in. ²). The length of such a cable is 3 m (9'-10 1/8'') to 5 m (16'-4 7/8'').
Measure the VSWR of the antenna system using a
Broadband Site Master.
Measure the VSWR at the point where the antenna
system is connected to the RF port on the RRU.
Do not connect an antenna system that has a
VSWR of 1.5 or higher to the RRU.
Grounding
RTN(+)
NEG (-)
10 mm2 (0.02 in.²)
-48 V DC RRU3702
3.3 mm2 (0.005 in. ²)
30
No. Item
1 All self-made PGND cables are copper-based and are of the correct wire
diameters. No breaking devices, such as switches and fuses, are allowed
for the electric connection of the grounding system. No short circuits are
allowed. Each terminal on the ground bar connects with only one wiring
terminal of the PGND cable.
2 The redundant part of the power cable or PGND cable is stripped off rather
than coiled.
3 The terminals at both ends of the power cable or PGND cable are securely
soldered or crimped.
4 The bare wires and the terminal handles at the wiring terminals are coated
with heat-shrinkable tubes.
5 The flat washer and the spring washer are well mounted on all OT terminals.
6 All cables are connected securely and reliably. Pay special attention to the
cable connections at the bottom of the cabinet.
7 The cables are neatly and tightly bound. The cable ties are evenly spaced
and face the same direction.
8 The power cable, PGND cable, feeder, optical fiber, and the E1/T1/FE
signal cable are bound separately with spacing greater than 3 cm (1 3/16").
9 The cable layout facilitates maintenance and future capacity expansion. The
bending radii of the cables meet the requirements.
10 All the labels at both ends of the cables are legible.
11 The extra length of the cable ties is cut and removed. The cut surfaces are
smooth and have no sharp edges.
12 The vacant connectors for the cables are properly protected.
Installation Checklist for BBU
31
Installation Checklist for RRU
Upgrade the software and deliver
the configuration using a USB
disk
Start the project self-test function
on the Web LMT
Save the report
End
Is the test successful? Power off the BS and check the
hardware installation
Start
Power on the BS
Prepare a USB disk
Yes
No
Power on the BS
Checklist for the Project Implementation
Perform a self-check
after the project is
complete.
For details about the procedures, see the
online help after logging in to the Web LMT.
No. Item
1 The RRU and its mounting kits are securely installed.
2 The cover plate is securely installed on the RRU cabling cavity.
3 Waterproof blocks are installed in vacant cable troughs of the RRU cabling
cavity. The cover plate of the cabling cavity is securely installed. The vacant
RF ports are waterproofed and covered with waterproof caps.
4 The power cable and PGND cable are intact.
5 The terminals at both ends of the power cable or PGND cable are securely
soldered or crimped.
6 The flat washer and the spring washer are securely mounted on all OT
terminals.
7 The power cable and the PGND cable are intact and correctly connected.
They are not short-circuited.
8 The power cable, PGND cable, feeder, optical fiber, and E1/T1/FE signal
cable are bound separately with a minimum spacing of 3 cm (1 3/16").
9 The signal cables are not damaged or broken, and the connectors are intact.
10 Labels at both ends of each cable are correct, legible, and complete.
32
Appendix
Hoist the RRU3702 and mounting brackets onto the tower.
Bind the RRU with a sling.
zInstaller A climbs the tower and fixes the crown
block onto the tower platform support. Installer A then
inserts the hoist thread through the crown block.
zInstaller C uses the sling to tie the RRU and the
mounting brackets according to the figure above.
Installer C then uses the traction rope to tie a knot at
the handle of the RRU.
zInstaller B pulls down the sling. Installer C pulls out
the traction rope to prevent the RRU and the
mounting brackets from colliding with the tower.
zInstaller A holds on to the RRU and the mounting
brackets, and then loosens the knot to release the
items.
zThe previous procedures for lifting an RRU is for
reference only.
zWhen hoisting the RRU, protect it from colliding
with the tower.
zThe diameters for the sling and traction rope are
about 20 mm (0 4/5'') and be less than 25 mm (1").
Ropes must bear a weight more than four times the
weight of an RRU.
Lifting sling
Lower edge of the
attachment plate
Traction sling
Do not lift the RRU by the
handle only.
Traction rope
Sling
Pulley
Hoisting the RRU3702 and Mounting Brackets onto the Tower
c
33
Indicators
b
BBU-Indicators on the BMPT
a
BBU-BBBI-Indicators of the RF ports on the baseband unit
b
34
Indicators
b
cIndicators on the RRU3702
35
Preparing OT Terminals for a DCDU Power Cable
d
Lead the wires
made of the
shielding layers
through heat-
shrinkable tubes.
Wrap the PVC
insulating tape
at the joint
where the three
wires meet. OT terminal on
the shielding
layer
35
36
Installing a Ground Clip
e
zWrap three layers of tape following the sequence shown in the above figures. When wrapping tape, be sure
that each layer of tape overlaps more than 50% of the preceding layer.
zThe other end of the ground cable connecting to the ground clip is terminated with a one-hole OT terminal with
an M8 bolt, and is connected to an external ground bar.
1. Strip a sheath of 32 mm (1 1/4") from an RRU power cable using a wire stripper.
2. Install a ground clip on the exposed shield layer, and tighten the screws on the
ground clip.
zEnsure that the exposed shield layer must be longer than a ground clip.
zDo not clip the shield layer of an RRU power cable to a ground clip.
4. Wrap the ground clip using PVC
insulation tape.
3. Wrap the ground clip using
waterproof tape.
Ground
cable
Ground clip
RRU power
cable
36
HUAWEI TECHNOLOGIES CO., LTD.
Huawei Industrial Base Bantian Longgang
Shenzhen 518129
People’s Republic of China
www.huawei.com