Huawei RRU3702-2500 Users Guide

SingleRAN WiMAX-LTE

V100R001C00

Quick Installation Guide
(Co-RRU3702)

Issue: XX
Date: 2011-XX-XX

HUAWEI TECHNOLOGIES CO., LTD.

Contents

Installation Tools
Installation Scenarios

2
3

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

4
6
7
9
15
19
26
29
29
30

31
Checklist for the Project Implementation
Appendix

31

32

1

Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved.

Installation Tools

Hammer drill (with bit 14)

Heat gun

Rubber mallet

ESD gloves

Phillips screwdriver

(M3 to M6)

Crimping pliers

Vacuum cleaner

Flat-head screwdriver

(M3 to M6)

Wire stripper

Utility knife

Level

Multimeter

Wire cutter

Torque screwdriver

Marking pen

[with a diameter of no more

than 10 mm (0 3/8")]

Adjustable wrench

[with a diameter of at least

32 mm (1 1/4")]

Torque wrench

Combination wrench

[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

Measuring tape

2

Installation Scenarios

BBU3900 Installation Scenarios

a

BBU

In a 19-inch indoor rack

For details about the installation of the APM30 and the TMC11H, see the APM30H Installation Guide.

In an APM30H

BBU

BBU

In a TMC11H

BBU

In an OMB

RRU3702 Installation Scenarios

b

On a pole

On angle steel

On U-steel

On a wire pole

z A 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.
z A module must be powered on within 24 hours after being unpacked or after being powered off for maintenance.

On a wall

3

Requirements for Dimensions and Installation Space

Dimensions

a

3

1

0

m

m

(

1

2

3

/

1

6

'

'

)

86 mm (3 3/8'')

)

'

'

8

/

3

5

-

'

1

(

m

m

2

4

4

Dimensions of the BBU: 442 mm (1'-5 3/8'') x 310 mm (1'-0 3/16'') x 86 mm (3 3/8'')

356 mm (1'-2'')

Dimensions of the RRU3702:
480 mm (1'-6 7/8'') x 356 mm (1'-2'') x 120 mm (4 3/4'')

Space Requirements for the BBU3900 Installation

b

120 mm (4 3/4'')

480 mm

(1'-6 7/8'')

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'')

158 mm (6 1/4'')374 mm (1'-2 3/4'')

484 mm
(1'-7 1/16'')

In a 19-inch rack

m

5

2

)

'

'

1

(

m

m

5

2

)

'

'

1

(

m

7

0

m

m

(

2

3

/

4

'

'

)

4

c

Installation Space

Recommended space for RRU3702 installation Minimum space for RRU3702 installation

≥ 300 mm (11 13/16'')

≥

3

(

0

1

0

1

m

1

3

m

/

1

6

'

'

)

m

m

0

0

)

8

'

'

2

/

≥

1

7

-

'

2

(

≥ 500 mm (1'-7 11/16'')

≥

6

0

(

0

1

'

-

m

1

1

m

5

/

8

'

'

)

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.

Recommended horizontal space for
RRU3702 installation

200 mm (7 7/8'')

1

0

0

m

(

3

m

1

5

/

1

6

'

'

)

m

)

m

'

'

0

8

/

0

5

6

1

1

-

'

1

(

300 mm (11 13/16'')

4

0

0

m

(

1

m

'

-

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.

Minimum horizontal space for
RRU3702 installation

≥ 300 mm
(11 13/16'')

≥ 600 mm
(1'-11 5/8'')

Recommended vertical space for
RRU3702 installation

≥ 300 mm (11 13/16'')

≥ 500 mm (1'-7 11/16'')

≥ 600 mm

(1'-11 5/8'')

100 mm
(3 15/16'')

400 mm

(1'-3 3/4'')

Recommended vertical space for
RRU3702 installation

200 mm (7 7/8'')

300 mm (11 13/16'')

400 mm

(1'-3 3/4'')

≥ 500 mm (1'-7 11/16'')

300 mm (11 13/16'')

5

Installation Procedure

6

Installing the BBU3900

a. Verify that the BBU3900 mounting ears are regularly
installed in a 19-inch rack, and are reversely installed

b. Install the BBU3900 in an
APM30H using a binding bracket.

in an APM.

Regularly installed mounting ears Reversely installed mounting ears

Installing the BBU3900 in a 19-Inch Rack

a

For easy installation, remove the two ground
screws on the right side of the BBU panel before
installing the BBU.

Bounding
bracket

Reversely
installed
mounting ears

Regularly installed
mounting ears

b

Installing the BBU3900 in an APM30H

BBU

M6X16

2 N.m

(17.70 lbf.in.)

M6X16

2 N.m

(17.70 lbf.in.)

Reversely installed
mounting ears

7

Installing the BBU3900 in a TMC11H

c

BBU3900

Installing the BBU3900 in an OMB

e

M6X16

2 N.m

(17.70 lbf.in.)

Reversely installed
mounting ears

Remove the two ground screws on the right side of
the BBU panel before installing the BBU.

M6X16

2 N.m

(17.70 lbf.in.)

FAN

Reversely installed
mounting ears

8

Installing the RRU

Mounting brackets for RRU

Tighten the
screws when
installing the
RRU. Loosen
these screws
when removing
the RRU.

Main bracket

Logo on the cover plate

Transfer pieces

Auxiliary bracket

Dual-nut bolt

Tighten the screws when
removing the RRU.

RRU

Angle steel
or U-steel

≤10°

Fixing
hoop

The angle between
the vertical and the
angle steel or U­steel or angle steel
where the RRU is
installed must be
less than or equal
to 10 degree.

z The RRU must be supported by foam or cardboard for protection.
z The 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.

Installing the RRU on a Pole

a

[Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]

1. Install the main bracket.

When installing the
main bracket,
ensure that the
contact piece on
the bracket is fixed.

1200 mm (3'-11 1/4'')

to 1600 mm (5'-3'')

Main bracket

Spring plate

60 mm (2 3/8'') to 114 mm (4 1/2'')
The recommended diameter of the pole is 80 mm (3 1/8").

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.

9

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.

Tighten the two dual-nut bolt assemblies

40 N.m

(354.03 lbf.in.)

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.

3. Install the RRU on the main bracket. When you hear click sound, the RRU is
securely installed.

b

[Diameter: 60 mm (2 3/8'') to 114 mm (4 1/2'')]

1. Install the first RRU. 2. Install the second main bracket.

Installing Two RRUs on a Pole

The arrows on the main
bracket point upwards.

10

3. Swap the front cover and the transitional piece at the rear of the
second RRU.

M6X16

(44.25 lbf.in.)

5 N.m

4. Install the second RRU on the main bracket.

Ensure that the cabling
cavities of the two RRUs
face the same direction
when installing the RRUs.

Installing the RRU on a U-Steel

c

In reverse mode

In standard mode

Cabling cavity

Top views of four installation modes

U-steel

30 mm (1 3/16'') to
50 mm (1 15/16'')

50 mm (1 15/16'') to
100 mm (3 15/16'')

z The process for installing the RRU on U-steel is the same as the procedure for
installing the RRU on a pole.
z You are advised to install only one RRU on U-steel.

11

d

Installing the RRU on Angle Steel

Angle steel

o

t

80 mm (3 1/8'')

63 mm (2 1/2'')

80 mm (3 1/8'')

z The process for installing the RRU on angle steel is the same as the
procedure for installing the RRU on a pole.

z You are advised to install only one RRU on angle steel.

Installing the RRU on a Wire Pole

e

63 mm (2 1/2'') to

Top views of the installation modes

[Diameter: 300 mm (11 4/5'') to 390 mm (1' 3 3/8'')]

You are advised to install only one RRU on a wire pole.

35N•m

(309.78 lbf.in.)

Main bracket

12

Installing the RRU on a Wall

f

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.

128 mm(5 1/16'')

Auxiliary bracket

123 mm
(4 13/16'')

1200 mm (3'-11 1/4")
to 1600 mm (5'-3")

It is recommended that the auxiliary bracket be 1200 mm (3'-11 1/4") to 1600 mm (5'-3") above the ground.

123 mm
(4 13/16'')

RRU

2. Drill holes at the anchor points and then install the expansion bolt assemblies.

M10x65 bolt
Spring washer 10

Ø14

90°

55 mm to 60 mm

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.

20 mm (13/16") to 30 mm (1 3/16")

After the expansion bolt is removed,
dispose of the plastic tube.

When the RRU is installed on a wall, the requirements are as follows:

z For one RRU, the wall has a weight-bearing capacity of 68 kg (149.94 lb).
z The 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.

13

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").

M10

30 N.m

(265.52 lbf.in.)

Arrows point upwards

4. Install the main bracket.

5. Install the RRU.

14

Connecting Cables

Cable Connections in General (RRU3702)

a

z The LMPTb, LMPTw, LBBPc, UPEUc, and FANc are used as examples.
z RRU3702s of a WiMAX-LTE BS in co-RRU mode supports only the chain topology.
z An 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.

z Configure the DCDU base d o n on sit e sit u ati on s.

Configuration Type：WiMAX: S(2/2/2), 2T2R, 10M Hz

LTE:S(1/1/1), 2T2R, 20M Hz

A

A

A

N

N

T

T

A

N

N

T

T

A

A

N

N

T

T

WiMAX

C=carrier,1C=1carrier,2C=2 c arri er

LTE

2C

External
power
supply

system

1C

ASN-GW

CPRI optical fiber

Color­coding

DCDU

Optical fiber

Ethernet cable

RRU power cable

To a
Boolean
sensor

RS485 port

BBU power
cable

Connected through the optical
fiber or Ethernet cable

15

Configuration Type：WiMAX: S(2/2/2), 4T4R, 10M Hz

LTE:S(1/1/1), 4T4R, 10M Hz

ANT

ANT ANT

CPRI optical fiber

WiMAX

C=carrier,1C=1carrier,2C=2 c arri er

RRU power cable

LTE

2C

External
power
supply

system

1C

ASN-GW

Color­coding

Optical fiber

Ethernet cable

Connected through the optical
fiber or Ethernet cable

DCDU

To a
Boolean
sensor

BBU power
cable

RS485 port

16

Configuration Type：WiMAX: S(1/1/1), 4T4R, 10M Hz

LTE:S(1/1/1), 4T4R, 20M Hz

ANT ANT ANT

CPRI optical fiber

WiMAX

C=carrier,1C=1carrier

RRU power cable

LTE

1C

External
power
supply

system

1C

ASN-GW

Color­coding

Optical fiber

Ethernet cable

Connected through the optical
fiber or Ethernet cable

DCDU

To a
Boolean
sensor

BBU power
cable

RS485 port

17

b

Cable 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

a

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.

c

18

Installing BBU3900 Cables

BBU

APM30H TMC11H

Installing the BBU3900 PGND Cable

a

DCDU
BBU

BBU

BBU PGND cable

b

Installing the -48 V DC Power Cable of the BBU3900

BBU

OT terminal

Two-hole OT terminal

•The BBU PGND cable is yellow and green
or green. The cross-sectional area of the
PGND cable is 6 mm

•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.

2

(0.009 in.²).

BBU power cable

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.

19

Installing the Power Cable Between the BBU3900 and the APM30H

c

PWR

Installing the Power Cable Between the BBU3900 and the TMC11H

d

Installing the Power Cable Between the BBU3900 and the OMB

e

OMB

LOAD1 10A

PWR

20

Installing the FE/GE Ethernet Cable or Optical Fibers

f

BBU3900

Optical fiber

ASN-GW

z Use either the Ethernet cable or optical fiber to connect

the transmission equipment or gateway.

z Install 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.

z Confirm 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.

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.

Ethernet cable

Ethernet cableOptical fiber

Install swappable
optical modules

ground clip

21

g

Installing CPRI Optical Fibers Between the BBU3900 and the RRU3702

Install hot-swappable
optical modules.

RRU3702

RRU3702 RRU3702

LTE

WiMAX

CPRI optical fiber

z Install 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.
z Connect 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.

LTE
WiMAX

WiMAX

LTE
WiMAX

LTE

WiMAX

h

Installing a GPS Clock Signal Cable

GPS antenna

Surge protector
on the
equipment side

Surge

Protect

GPS clock
signal cable

SMA
T-connector

BBU3900

Type N female
connector

SMA male

GPS clock signal cable

When the BBU3900 is installed in a 19-inch
cabinet, ground the surg e protector. Confirm that
the ground cable is less than or equal to 300 mm
(11 13/16") with a cross-sectional area of 6 mm
(0.01 in.2), and that both ends are terminated with
an OT terminal respectively.

The installation of an SMA T-connector is for
reference only.

connector

2

22

a. In an APM30H

SMA T-connector

Surge protector

b. In an OMB

1.Install an SMA T-connector.

SMA male connector

2.Install a surge protector.

Surge protector

z Install a T-connector inside a cabinet and

secure it nearby based on the cable layout.

z Wrap the T-connector joints with PVC

insulation tape.

23

Installing the Monitoring Signal Cable Between the BBU3900 and the

j

EMUA

EMUA

Monitoring signal cable between

the BBU and the EMUA

This cable connection scenario is not
applicable to the APM30H, TMC11H,
or OMB.

MON1

Installing the Monitoring Signal Cable Between the BBU3900 and

k

CMUA (APM30H, TMC11H)

APM30H TMC11H

TMC11H

APM30H

24

Installing the Monitoring Signal Cable Between the BBU3900 and the OMB

l

MON1

RS232/RS485

COM OUT COM IN

z The MON1 port on the BBU3900 is connected to the COM
IN port on the OMB using an alarm signal cable.
z The 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.

25

Installing RRU3702 Cables

a

Installing the RRU3702 PGND Cable

M6

RRU PGND cable

OT terminal

Two-hole OT terminal

16 mm2 (0.02 in.²)

4.8N•m

(42.48 lbf.in.)

Installing the RRU3702 Power Cable

b

Ground point for
the shielding

RTN0(+)
NEG0(-)

layer of the
power cable

z The cross-sectional area of the RRU PGND cable (green
and yellow or green) is 16 mm
z One 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.

2

(0.02 in.2) (6AWG).

RRU

LOAD0

DCDU

z Connect the DCDU-03B and the RRU using
the LOAD0 or LOAD5 port, with a priority of
LOAD0 > LOAD5.
z When the BBU and RRU are used indoors,
do not ground the RRU power cable.
z The RRU power cable must be grounded if
an RRU is installed outdoors. For details, see
the appendix.
z For details about how to prepare an OT
terminal, see the appendix.

RRU power
cable

26

Bent OT terminal:

Lengths for preparing
the RRU power cable

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.

Cabling
cavity

Precisely follow the instructions on the
cover plate on the cabling cavity and the
installation guide when preparing the
cable.

Cover plate

1.OT terminal for RRU power cable

-48 V DC power cable

Shielding layer

NEG (-)

RTN (+)

OT terminal

Installing CPRI Optical Fibers

c

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.

For details, see "Installing CPRI Optical Fibers Between the BBU3900 and
the RRU3702" on page 22.

Close the cabling cavity.

M4

1.4N•m

12.39 lbf.in.

Waterproof block

Fill vacant cable holes in the cabling
cavity using waterproof blocks.

27

Installing the RF Jumper of the RRU3702

d

Connections between the 4T4R RRU and the 4-port antenna

ANTA_TX/RX ANTB_TX/RX ANTC_TX/RX ANTD_TX/RX

RRU

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.

ANTENNA

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

Dustproof
cap

Waterproof tape

PVC insulation tape

Installing the RF jumper

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.

Take insulation and waterproof measures only for the RF jumpers
connected to outdoor RRUs.

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.

Wrap a layer of insulation tape
Wrap three layers of waterproof tape
Wrap three layers of insulation tape

28

RF jumper

Installing the Outdoor Cable Transfer Box

NEG (-)

RTN(+)

Grounding

10 mm2 (0.02 in.²)

-48 V DC

z When 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.

z The core area of the power cable between the outdoor cable transfer box and the DCDU
or APM30H is 10 mm² (0.02 in.²).

z The 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'').

3.3 mm2 (0.005 in. ²)

RRU3702

Measuring the VSWR of the Antenna System

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.

29

Installation Checklist for BBU

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.

30

Installation Checklist for RRU

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.

Checklist for the Project Implementation

Perform a self-check
after the project is
complete.

Upgrade the software and deliver

the configuration using a USB

Start the project self-test function

Start

Prepare a USB disk

Power on the BS

disk

on the Web LMT

Power on the BS

Is the test successful?

Yes

Save the report

End

No

Power off the BS and check the

hardware installation

For details about the procedures, see the
online help after logging in to the Web LMT.

31

Appendix

Hoisting the RRU3702 and Mounting Brackets onto the Tower

c

Bind the RRU with a sling.

Lifting sling

Traction sling

Lower edge of the
attachment plate

Do not lift the RRU by the
handle only.

Hoist the RRU3702 and mounting brackets onto the tower.

z When hoisting the RRU, protect it from colliding
with the tower.
z The diameters for the sling and traction rope are

Pulley

Traction rope

Sling

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.

z Installer 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.
z Installer 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.
z Installer 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.
z Installer A holds on to the RRU and the mounting
brackets, and then loosens the knot to release the
items.
z The previous procedures for lifting an RRU is for
reference only.

32

Indicators

b

BBU-Indicators on the BMPT

a

b

BBU-BBBI-Indicators of the RF ports on the baseband unit

33

Indicators

b

c

Indicators on the RRU3702

34

Preparing OT Terminals for a DCDU Power Cable

d

Wrap the PVC
insulating tape
at the joint
where the three
wires meet.

Lead the wires
made of the
shielding layers
through heat­shrinkable tubes.

OT terminal on
the shielding
layer

35

35

Installing a Ground Clip

e

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.

Ground
cable

Ground clip

RRU power
cable

z Ensure that the exposed shield layer must be longer than a ground clip.
z Do not clip the shield layer of an RRU power cable to a ground clip.

3. Wrap the ground clip using
waterproof tape.

4. Wrap the ground clip using PVC
insulation tape.

z Wrap 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.

z The 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.

36

36

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Industrial Base Bantian Longgang

Shenzhen 518129

People’s Republic of China

www.huawei.com