BTS3012 Quick Installation Guide

HUAWEI BTS3012 Fast Installation Guide Internal Use

1

BTS3012 Fast Installation Guide

Installation Process

Yes

No

No

Yes

No

Yes

No

Yes

Installation starts

Is the cabling rack needed?

Install the cabling rack

Is the grounding bar needed?

Install the grounding bar

Install the cabinet

Install the boards

Is the sidepower power system needed?

Install cables

Check the installation of hardware

Does the installation pass the check? Reinstall the parts that do not pass the check

Installation ends

Install the sidepower power system


2

Notes:

The guide does not describe how to install the cabling rack, grounding bar, and sidepower power

system. For the specific installation of the preceding parts, refer to the HUAWEI BTS3012 Base

Station Installation Manual-Cabinet Installation.

A BTS3012 cabinet can be installed in the following modes:

Install the cabinet on the cement ground with enough bearing capacity

Install the cabinet on the antistatic floor

Install the cabinet on the cement ground with insufficient bearing capacity

Install combined cabinets

The guide describes how to install a BTS3012 cabinet on the cement ground with enough bearing

capacity. To know other installation modes, refer to the HUAWEI BTS3012 Base Station Installation

Manual-Cabinet Installation.

Appearance and Configuration of BTS3012


3

Appearance

and

configuration

BTS3012 Cabinet Layout Principle

Layout principle

Multiple BTS3012 cabinets can be installed in combined mode. Reserve a passage with a width of least 0.8m in front of the cabinet. Keep the cabinet close to the sealing window of feeder cables to reduce the length

of feeder cables. In all installation conditions, use a horizontal ruler to measure the levelness of

cabinets and ensure that the cabinet to be installed is on a horizontal surface with other cabinets in the equipment room.

Notes: Do not install a cabinet close to the wall. When installing a cabinet along the wall, reserve a gap of at least 10cm.

Cabinet Installation — Install a BTS3012 cabinet on the cement ground with enough bearing capacity


4

Locate the

base

Confirm the position of a cabinet according to the following figure.

Note:

The breach in the preceding figure indicates the position of the front door of the cabinet.

Caution

In a building made of lift-slabs, do not install multiple cabinets on a slab.

Install

expansion

bolts

Use a Ф16 drill hammer to install M12 expansion bolts. For the process of installing expansion bolts,

refer to the HUAWEI BTS3012 Base Station Installation Manual-Cabinet Installation.

457 ± 1

600

Front

Rear

Left Right

24

370 ± 1

450 Hole position of

expansion bolt


5

Fix the base

Install the insulation shells, flat washers, spring washers, and bolts in a correct order.

Adjust the

levelness

Use a horizontal ruler to check the levelness of two horizontal borders on the top of the bottom frame. If the bottom frame is out of the horizontal, add leveling washers below the insulation plate to level the bottom frame.

Check the

insulativity

Check the resistance of the bottom frame.

If the resistance is equal to or bigger than 5MΩ, the bottom frame is insulated from the ground. You can fix the cabinet then.

If the resistance is smaller than 5MΩ, the bottom frame is not insulated. You need check the bottom frame and ensure that it is correctly installed.


6

Fix the cabinet

To fix a cabinet on the bottom frame, do as follows:

1. Put the cabinet on the bottom frame to have the upper frame supported by the below frame.

2. Push the cabinet along the guide rails to make the upper frame and bottom frame tightly combined.

3. Use two bolts to fasten the upper and bottom frames.

4. Fix the panel at the front of the base.

5. Fasten the assembled bolts on the panel.

Finish the

installation

After a cabinet is installed, check the surface of the cabinet. Paint the cabinet if the paint on the

cabinet peels off.

Install the boards

Prepare for the

installation Notes

Before installing a board, pay attention to the following issues:

Check the cabinet and frames and clean the cabinet and frame.


7

Wear an ESD-preventive wrist strap before installing a board.

Do not touch the printed circuit board or components except jumpers and DIP switches with bare hands.

To install a DTMU board, do as follows:

1. Set the DIP switches of the board. The DIP switches S4, S5, S6, and S7 are used

to select the grounding for the outer shell of No.1–8 E1 cables. S3 is reserved. For

the description of DIP switches, refer to the silk print on the board or the HUAWEI

BTS3012 Base Station Installation Manual-Cabinet Installation.

ONS4

S5

S6

S7

OFF

S3

4

14141

4

1

41

2. Rotate the foursquare bolts clockwise on the panel of the board clockwise to

ensure that the bolts are movable. Pull out the handle bars on the DTMU panel

and push the DTMU board along the slide till the DTMU board cannot move.

3. Fasten the handle bars and screw down the preceding bolts.

Antistatic jack Connector of antistatic wrist strap

Antistatic wrist strap


8

Install a DTMU

board

Handle bar on the panel and subrack

Install the

DEMU and

sensors

Notes: You need only manually set the DIP switch SW_AV. Other seven DIP switches can be set through dynamic data configuration console

Remove the anti-dust cover when setting the DIP switch SW_AV.

1. Set DIP switches on the DEMU board according to the type of sensor signals. Eight DIP

switches are distributed on the DEMU board. For description of DIP switches, refer to the

silk print on the board or the HUAWEI BTS3012 Base Station Installation Manual-Cabinet

Installation.


9

ON SW_THE

OFF 4 1 4 1

SW_AE

4 1

SW_BKE

18 18 18 18 14

OFF ON

SW12BSW24B SW24A SW24B SW_AV

2. Push the DEMU board along the slide till the DEMU board cannot move and use a screw

driver to screw down the bolts.

3. Install sensors according to the customer demand.

Door status sensor Install the sensor at the border between the top of the door and the doorframe. To install the door status sensor, do as follows:

(1) Use a pencil to mark the positions of installation holes for the door status sensor on the door and doorframe.

(2) Use a percussion drill to drill holes at the preceding marked positions.

(3) Put plastic expansion tubes into the installation holes.

(4) Use bolts to fasten the door status sensor on the doorframe and door.

Water sensor

Place the sensor at the place where water easily penetrates or lower place in the equipment room. To install the water sensor, do as follows:

(1) Select a lower position in the equipment room or the position below the BTS equipment, and clean the position.

(2) Place the water sensor horizontally.

Smoke sensor

Install the smoke sensor at the center of the ceiling of the house. To install the smoke sensor, do as follows:

(1) Remove the base from the smoke sensor.

(2) Use a pencil to mark the positions of installation holes for the base on the ceiling.

(3) Use a percussion drill to drill holes at the marked positions.

(4) Put plastic expansion tubes into the installation holes.

(5) Use bolts to fasten the base on the ceiling.

(6) Install the smoke sensor.

Infrared sensor


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Place the infrared sensor on a wall where there is a big detection scope and at a height of 1.5m above the ground. The sensor should face a position that possibly encounters intrusion and there must be no obstacle in the detection scope. To install the infrared sensor, do as follows:

(1) Remove the installation base from the back of the infrared sensor.

(2) Use a pencil to mark two hole positions on the wall.


(4) Put the plastic expansion tubes into the installation holes.

(5) Use bolts to fasten the installation base on the wall.

(6) Screw down the infrared sensor on the installation base.

Temperature and humidity sensor

Install the temperature and humidity sensor on the wall at a height of 1.5m. To install the temperature and humidity sensor, do as follows:

(1) Remove the backplane of the temperature and humidity sensor.

(2) Use a pencil to mark three hole positions for the backplane on the wall.


(4) Put the plastic expansion tubes into the installation holes.

(5) Use bolts to fix the backplane of the temperature and humidity sensor on the wall.

(6) Install the temperature and humidity sensor on the backplane again.

4. Connect sensors to the cabinet. Connect the MD68 male connector of digital signal

conversion cable to the IN port on the DEMU plane.

Use the special monitoring signal cable to connect the AIN port on the DMLC board on the

top of the cabinet and the DDF, and connect the external alarm signal connection terminals

of DDF to all sensors.

Install a DATU

board

When installing a DATU board, you need not set DIP switches on the DATU board. The method of

installing a DATU board is the same as the method of installing a DTMU board.


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Install a DTRU

board

Notes: After installation is complete, put protective caps at the bottom of the cabinet for the sake of future use.

Install protective caps on the power cable connectors that are not used,

so that the inner conductor in the cable connectors does not contact the

edges or corners of the cabinet, which may cause accidents.

1. Confirm the installation slot of a board according to different configuration modes for the sake of convenient cable distribution and maintenance.

2. Hold the handle bar with one hand, lift the module with the other hand, and put the module in the corresponding slide and push the module into the slide.

3. Screw down four bolts at the four corners of the plane to fasten the module and frame.

4. Remove protective caps from power cables of all DTRU boards. Insert cable connectors into the PWR interfaces on the DTRU planes and screw down the bolts.

5. Install a blank filler panel in the idle slot and screw down the bolts. Put the unused power cables in order and use cable ties to bind the cables to the handle bar.

Install a DDPU

board and a

DCOM board

Notes: After power-on of the cabinet, the DDPU boards and DCOM boards have a high temperature. Therefore, do not touch the boards to avoid scald.

The DDPU boards are hot swappable. After removing a DDPU board, install protective caps on connectors of the power cables, so that the inner conductor in the cable connectors do not contact the edges or corners of the cabinet, which may cause accidents.

After installation, put the removed protective caps at the bottom of the cabinet for the sake of future use.

Install protective caps on the unused power cable connectors, so that the inner conductor in the cable connectors does not contact the edges or corners of the cabinet, which may cause accidents.

If a tower amplifier is configured at the top of the tower at a site, install Bias-Tee at the antenna port on the top of the cabinet to supply feed to the tower amplifier.

For the specific method of installing Bias-Tee at the top of the cabinet, refer to the HUAWEI BTS3012 Base Station Installation Manual-Antenna System Installation.

The method of installing a DDPU board is the same as the method of installing a DTRU board.

Install the

board on the

top of the

cabinet

Caution

Gently plug or push the boards in the subracks at the top of the cabinet, or

the pins may be bent by big force.

Distinguish the slot positions of the DSAC from the slot positions of the

DMLC and DELC.

1. Hold the two handle bars with two hands and put the board into the corresponding slot.

2. Push the board into the slot.

3. Hold the handle bars with two hands and insert the board into the slot tightly.

Install cables


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Cable layout at

the front of the

cabinet

P11

S12.5

S14

S13.6

S13.4S13.3

S13.5

P13

P9

P7

P8

P12

P14

To cabinet top :

FAN

DEMU

DCOM DCOM

DTRU DTRU DTRU DTRU

DDPU DDPU P2

P1BGND

P6TX 1

TX 2

P6.2 P6.3

P6

P9

P10P11P12

TX 1

TX 2

DCOM DDPU

DTRUDTRU

P6.1

R2

R1

R4 R6

R3R1

-48V

R19

R8

R3 R4 R5

R5

R6

R9 R10 R11 R12

R13 R15 R16 R17 R18R14R7

R8

R9

R10 R12

R13R14

R15R16

P14

S9

S10

S10

S11

S11

S12.2S12.1 S12.3 S12.4 S12.6

S12

DCCU

Signal cable Power cable RF cable

S12

S9

S13.1

S13.2

DATU

R20

R7

R2

R21

R22

R23

R24

R25

R26

R27

R28 R30

R29

R11

R17R18

DTRB

DCSU

S14

S13S16

S16

S17

S17.1

S17.2

P15

BBU/Transmission

subrack

P15

P10

P13

P15P15

S15

S15

P7P8

Notes:

In the preceding figure, the RF connection cables are configured between the DTRU and DDPU boards on the basis of S4/4/4 configuration mode.

In normal conditions, do no configure DCOM modules in S4/4/4 configuration mode. But the DCOM module is added in the preceding figure to show the connection of signal cables


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from the DCTB to DAFU subrack.

In the preceding figure, seven signal cables, including S10–S13, S15–S17 are all connected to the top of the cabinet.

Install radio frequency signal cables

Installation

requirements

Notes:

The cables must not hide LEDs on boards from view.

Make proper cable layout on a board to avoid obstacle of other boards and facilitate

convenient maintenance of boards.

RF signal cables include RF Rx cables and RF Tx cables.

RF Tx Cable

RF Rx Cable

1

2

1

2

To install RF signal cables, do as follows:

1. Connect one SMA angle male connector of the Rx cable to the RX port of the DDPU board and screw down the cable connector.

2. Connect the other SMA angle male connector of the Rx cable to the Rx port of the DTRU board and screw down the cable connector.

3. Connect one N angle male connector of the Tx cable to the Tx port of the DDPU board and screw down the cable connector.

4. Connect the other N angle male connector of the Tx cable to the Tx port of the DTRU board and screw down the cable connector.

5. Put the excessive parts of the RF signal cables into the cabling slots between two subracks and bind the cables with cable ties in order.

Connection of RF signal cables is finished.

Install the combined short-circuiting cables

Caution

Rotate both the upper and lower connectors of a cable at the same time, or the cable may be twisted.


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Install the

combined

short-circuiting

cables

To get combined carrier signals, use the combined short-circuiting cable to connect the TX

interface and IN interface of the DTRU board to achieve the combined output of transmitting

signals.

To install a combined short-circuiting cable, do as follows: 1. According to the BTS configuration mode, confirm the connection relationship between TX

interface and IN interface on the DTRU plane.

2. Connect one end (the N straight male connector) of the cable to the TX1 or TX2 interface

on the DTRU plane and the other end (the SMA straight male connector) to the IN1 or IN2

interface. Screw down the upper and the bottom connectors at the same time.

Install 1/2 inch indoor jumpers

Installing 1/2

inch indoor

jumpers

Caution

Tightly connect 1/2 inch indoor jumpers to avoid leakage of radio frequency

signals.

Connect one end of 1/2 inch indoor cable to the ANT port of the DDPU board and connect the other

end to the feeder cable through the feeder connector.

To install the 1/2 inch indoor cable, do as follows:

1. Cut cables into parts of proper length according to the cable distribution on cabling racks and

create DIN-type male connectors for both ends of the cables.

2. According to the configuration relationship, connect the DIN-type connector at one end of the jumper to the antenna interface ANTA or ANTB on the top of the DDPU board and the DIN-type connector at the other end of the jumper to the feeder cable of the antenna system.

3. Stick labels at both ends of a cable.


15

Install power cables

Connection

specifications

Caution

Do not connect the N line of the AC power cable to the GND protection of

switching equipment or other communication equipment.

Power cables include blue -48V power cables and black DC grounding cables.

Connection specifications:

Bind the –48V power cable and DC ground cable. Separate power cables from other cables. When distributing multiple power cables, bind the cables closely and neatly (without twists).

The cables ties should be located with an average distance from each other and in a proper degree of tightness. The cables should have a good shell.

The radius of the cable curve cannot be smaller than 20 times of the core diameter of the cable.

Distribute power cables according to the requirements of engineering drawing. When distributing power cables, do not connect two power cables with connectors or by

soldering if a power cable is not long enough, but replace with a new power cable.

Connect

power cables

To connect power cables to the cabinet, do as follows:

1. Remove the protective caps from the EMI filter and power input terminal block.

2. Insert the cord end terminal of a power cable through the terminal block.

3. Use a flathead screw driver to loosen the bolt in the hole above the power input terminal.


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4. Insert the cord end terminal of power cable into the cable connection hole on the left of the cord end terminal, screw down the bolt above the cable connection hole, and then use cable ties to bind the power cable to the bundling rack.

5. Reinstall protective caps.

To connect power cable and power distribution frame (PDF), do as follows:

Distribute the power cable along the cabling rack to the side of the PDF, and fix the OT terminals of power cable on the corresponding binding posts on the PDF.

Caution If the power of PDF is switched on, do not touch the cabinet with the adjustable

wrench and screw driver. It is recommended that the adjustable wrench is

bounded with insulated tape.

Install the protection ground cable

Installing a

protection

ground cable

The protection ground cable is a plastic insulation copper core cable of which the colors are yellow

and green and the cross-sectional area is bigger than 16mm2 (usually 25 mm2).

To connect a protection ground cable, do as follows:

1. Get a piece of power cable with a proper length and create OT terminals for the protection

ground cable.

2. Remove the protective cap from the power input terminal block, put one end of the protection ground cable through the terminal block, and connect the end of the protection ground cable to the PGND binding post on the protection ground bar.

3. Distribute the protection ground cable along cabling racks to the ground bar, and then connect the protection ground cable to the terminal of grounding bar.

Install the E1 cable


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Installing an

E1 cable

E1 cables include 75Ω E1 cable and 120Ω E1 cable. An E1 cable is connected to the TR interface on

the DELC board at the top of the cabinet.

To install an E1 cable, do as follows:

1. Insert the DB25 male connector of the E1 cable into the DB25 female socket on the DELC board at the top of the cabinet, and screw down the bolts.

2. Get cables of proper length according to the actual situation, create cable connectors, distribute cables on cabling racks, and connect the connectors to the cable connection terminals on the cabling racks.

3. Stick labels on the E1 cables.

Install signal cables at the top of the cabinet


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Installing

signal cables

Signal cables at the top of the cabinet include:

Digital signal input cable Digital signal output cable Monitoring signal cable Anti-lightning failure alarm cable Environment monitoring device signal cable

The following table shows the connection relationship between signal cables and interface boards at

the top of the cabinet:

Type of signal cable

Interface at the top of the cabinet

Type of connector at the top of the cabinet

Peer equipment

Digital signal input cable

SWIN interface of the DMLC

MD68 male connector

Related controlling

equipment

Digital signal output cable

SWOUT interface of the DMLC

DB15 male connector

Related controlling

equipment

Monitoring signal cable

AIN interface of the DMLC DB44 male connector

DDF

Anti-lightning failure alarm cable

S1+S1- interfaces of the DSAC

2PIN phoenix terminal

Lightning arrester of

power

Anti-lightning failure alarm cable of combined cabinets

S1+S1-, and S2+S2- interfaces of the DSAC

2PIN phoenix terminal

Corresponding

interface of the slave

cabinet

Environment monitoring device signal cable

COM1 port and COM2 port of the DSAC

DB9 male connector

Environment

monitoring device

The installation specifications of signal cables at the top of the cabinet are the same as the

installation specifications of E1 cables. For details, refer to the E1 cable installation specifications.

Install electrical adjusted signal cables

Installation Refer to the HUAWEI BTS3012 Base Station Installation Manual-Cabinet Installation.

Install signal cables of combined cabinets


Install combined signal cables


Install equipotential cables of combined cabinets


Install optical fibers


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Formatted: Bullets and Numbering


Check after installation——Power-on check

Preparing for the check

Note: The section describes the process of power-on check when the system is supplied with -48V DC power.

When the power of the cabinet is not switched on, use a multimeter to measure the resistance of all

power binding posts and ground binding posts and check for short circuit.

Power-on check of the

cabinet

1. Set all power switches on Busbar to “OFF” and turn on the switch of PDF to power on the cabinet.

2. Check the input voltage of PDF at the top of the BTS3012 cabinet. The allowed voltage is between–40V and –60V.

3. If all conditions are normal, check boards.

5.

Power-on check of fans

Set the power switch of the fan frame to “ON” and observe to see whether the fans normally rotate.


DTMU

1. Turn the power switch of the public subrack to “ON”.

2. Observe the RUN indicator on the DTMU board in the public subrack. The RUN indicator should

be slowly blinking (lighted 1s and off 1s) if the DTMU is normal.

Power-on check of the DTRU

1. Turn on the DC air-break switch of the DTRU subrack.

2. Check the RUN indicator on the DTRU plane. The RUN indicator should be slowly blinking

(lighted 1s and off 1s) if the DTRU board is normal.


DDPU

1. Check the cable from the DDPU to the DTRU. Check whether the DDPU power cables are

correctly installed.

2. Turn on the DC air-break switch of the DDPU subrack.

3. Check the RUN indicator on the DDPU plane. The RUN indicator should be slowly blinking



DAFU

1. Turn on the DC air-break switch of the DAFU subrack.

2. Check the RUN indicator on the DAFU plane. The RUN indicator should be slowly blinking


Completing the power-on

checks If all the preceding power-on checks pass, the power supply system of BTS is normal.

Notes about installation of the antenna system


20

BTS3012 antenna system

Avoiding reverse

connection of jumpers and feeder cables

Before installing the antenna system, mark all cables to avoid reverse connection of jumpers

and feeder cables. You can stick either labels or colored rings to cables to avoid reverse

connection of cables. Choose a method according to the customer demand.

Stick labels

You can stick corresponding labels to both ends of a cable to avoid reverse connection. The following table shows the labels that are stuck to three directional dual-polarization cables configured for all sectors in S6/6/6.

Labels of feeder cable

ANT1 ANT2 ANT3

Cable TX Cable RX Cable TX Cable RX Cable TX Cable RX

CELL0 Label Ant_0A Ant_0B Ant_0C Ant_0D Ant_0E Ant_0F



By sticking the preceding labels, you can distinguish three different feeder cables of three sectors. The same method can be used to stick labels to jumpers in the antenna system to achieve the one-to-one mapping with the feeder cable in the same radio frequency channel.

DIN male connector

D D P U

1/4 inch jumper

1/2 inch jumper

Feeder fixing clip and cabling rack

Feeder cable

1/2 inch jumper

Dual-band dual-polarization antenna

DIN female connector

DIN male connector

DIN female connector DIN female connector

Cabling interface of antenna jumper

at the bottom of the cabinet

DIN male connector DIN male connector


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Stick colored rings

You can stick different number of rings of different colors to both ends of cables to avoid the reverse connection. The colored rings in a radio frequency channel should be the same. In the following picture, different cells use colored rings of different colors; the receiving end and transmitting end use different number of color rings.

Constructing the grounding

network

All outdoor BTSs need grounding network. Establish the grounding network and test the quality of

grounding network before civil construction.

For construction of the grounding network, refer to the following picture.

D D P U

Dual-polarization antenna

Feeder

cable

1/2 inch jumper

1/4 inch

jumper

CR1

CR2

CR3

CR4

CR5 CR6

CR7

CR8

CRn indicates the code of colored rings. The feeder cables or jumpers in a radio

frequency channel use colored rings of the same colors and quantities.

namely: CR1 ＝ CR3 ＝ CR5 ＝ CR7 CR2 ＝ CR4 ＝ CR6 ＝ CR8

Note: The picture shows color rings of only a cell. Other cells use colored rings of different colors.


22

Installation requirements

of antenna support

1. Keep the antenna support vertical to prevent the antenna from tilting after installation.

2. There should be a distance bigger than 1.2m between supports in a cell.

3. There should be a distance bigger than 0.5m between two cells in a platform.

4. When the GSM antenna has the same height as the CDMA antenna, there should be a distance

bigger than 0.5m between a GSM cell and a CDMA cell.

5. After a support is fixed, there should be no obstacle, for example the microwave antenna, in front

(away from the tower) of the support.

Installation requirements

of antenna

1. Manually adjust the antenna plane to a proper mechanical tilt, and keep the electric adjusted tilt

of the antenna lever to 0°, namely pull out the electric adjusted antenna lever and fix it to 0°.

2. During the construction, do not pull the lever out from the electric adjusted antenna. Pull out the

lever and set it to 0° after the antenna is mounted.

3. Make simple waterproof processing of the two unused antenna interfaces in the dual-band

antenna.

4. The angle between the antenna and support should be smaller than 5°.

5. An omni-directional antenna should be at least 1.5m away from the tower. A directional antenna

should be at least 1m away from the tower.

6. The horizontal distance between the main antenna and diversity antenna of omni-directional

antenna should be as follows: not smaller than 4m for M900; not smaller than 2m for M1800

7. Two directional antennae on a support should have a distance of at least 0.5m from each other.

Tower

Electrode

Grounding network

of the tower

Conductor between grounding networks

BTS Grounding network of BTS


23

Requirements on the

planning of feeder cable

route

1. Reasonably plan the feeder cable route to avoid unnecessary occupation of space. 2. The feeder cable route should not block off the building of equipment room or the passageway. 3. The feeder cable cannot go through the cement platform in front of the cabinet door but should

go around the cement platform to the rear of the cabinet. 4. Plan positions for feeder cables of all sectors. The feeder cables of different sectors should be

distributed in different layers and different rows to avoid cross connection of feeder cables. 5. Make a consistent numbering of feeder cables both at the antenna side and the cabinet side to

avoid incorrect connection of feeder cables. 6. When distributing feeder cables at the rear of the cabinet, keep the feeder cables a proper

distance away from the power cables and transmission cables to avoid horizontal cross connection.

7. The feeder cables may cross the top of the building to the outside of the wall, so you need wear a protective tube on the part of the cable contacting the corner of the wall.

8. Make waterproof curves for jumpers at the following positions: The position where the jumpers access the equipment room The cable leading-out position of the antenna

9. The curve radius of feeder cables should be at least 20 times of the diameter of the feeder cable.

α ＜ 5 °

a b

c

d

Electric adjusted antenna lever Pull out the lever out and set it to 0°after the mounting is finished.

Jumper connector with waterproof processing


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Grounding requirements of antenna

1. Install a feeder clip every 1.5m on the feeder cable.

2. Connect the following positions of a feeder cable to the ground separately:

Top of the tower

Bottom of the tower

Point accessing the BTS

If two grounding points of a feeder cable have a distance over 60m, make another grounding

point between the two grounding points.

3. Make waterproof processing at the following positions of feeder cables and grounding cables:

The positions where the outer shell of feeder cables are peeled off for grounding

The positions where the grounding cables are connected to the grounding bar

4. The angle between a feeder cable and its grounding cable should be smaller than 15°.

Testing the antenna system

1. Use a radio analyzer to test the standing wave ratio of DIN male connector of the 1/2 inch jumper

connecting the antenna system.

2. The standing wave ratio should be smaller than 1.3.

3. If the standing wave ratio is equal to or bigger than 1.5, the antenna system has faults. In this

case, test the standing wave ratio segment by segment to locate problems.

Lightning arrester

Tower

Antenna

Grounding point at the top of the tower

Intermediate grounding point (the feeder cable on the tower is over 60m)

Feeder cable

Grounding point at the bottom of the tower Grounding cable of the feeder cable

Feeder grounding clip Cabling rack

Grounding bar Grounding cable of BTS BTS

Feeder cable

α ＜ 1 5 °

Cabling rack of the feeder cable Feeder cable clip


25

Waterproof requirements

of cables

After testing the antenna system, make waterproof processing for cables at the positions

where cables connect.

After an installed antenna system passes the test, use waterproof insulated tapes and PVC tapes to

make waterproof processing for cables at the positions where jumpers connect to the tower amplifier

and the positions where jumpers connects feeder cables.

To protect the cables against water and avoid the standing wave alarms, create waterproof curves at

the positions where jumpers and feeder cables connect.

Use the tape to wrap a jumper where it

connects to another cable

Expected appearance

after installation

Expected appearance

after installation

Documents

BTS3012 Quick Installation Guide