BTS HW System

Viettel (Cambodia) Pte., Ltd

HUAWEI BTS3900

Hardware and Alarm

Pheoung Sarim BSS Team leader

NOC

Department

Contents

1- BTS3900/BTS3012 System Description 2- Hardware Component

3- Alarm

1- BTS3012/BTS3900 System Description

MS: Mobile Station BTS: Base Transceiver Station BSC: Base Station Controller HLR: Home Location Register AUC: Authentication Center EIR: Equipment Identity Register MSC: Mobile Switching Center VLR: Visitor Location Register SMC: Short Message Center VM: Voice Mailbox OMC: Operation and Maintenance Center DBS ： Distributed Base Station

2- Hardware Component

ØExternal alarm (RJ45 Port 0)

2. BTS3012 Hardware structure

DTRU DDPU

Antenna and feeder subsystem Forepart of RF Subsystem DTRU DDPU DTRU DDPU Double transceiver subsystem Um_Interface fiber E1 Abis Interface Common subsystem NFCB Metro 100 DTMU DEMU E1 BITS Monitor TBUS/DBUS/CBUS MS FH_BUS Extension cabinet DBU S/ TBUS CBUS CBUS 3 CBUS 3 CBUS 3 CBUS 2 CBUS 2 CBUS 2 CBUS 3 CBUS 3 P ro te ct io n f o r si g n a l FH_BUS FH_BUS RF signal RF signal RF signal DCSU DBUS

uBTS 3012 Hardware consists of :

2- Hardware Component (Cont)

D D D D

Wiring & Air Inlet Wiring D D P U D D P U D T R U D T R U D T R U Wiring FAN Air Inlet M L

C Power EMC and

D D P U E L C E L C S A C D T M U D E M U D C C U C S D U Double transceiver subsystem Common Subsyste m Antenna Front-End of the RF Subsystem (DAFU) Cabinet Top Access Subsystem (DCTB)

2- Hardware Component (Cont)

uBTS 3012 Hardware consists of :

Abbreviations Description

DTRU Double Transceiver Unit

DTMU Transmission & Timing & Management Unit for DTRU BTS DCCU Cable Connection Unit for DTRU BTS

DAFU Antenna Front-end Unit for DTRU BTS DDPU Dual Duplexer Unit for DTRU BTS

DMLC Monitor Signal Lightning-Protection Card for DTRU BTS DELC E1 Signal Lightning-Protection Card for DTRU BTS DCSU Combined cabinet Signal connection Unit for DTRU BTS DEMU Environment Monitoring Unit for DTRU BTS

DCTB Cabinet Top Backplane for DTRU BTS

3- Alarm

1- Board Type Mismatch alarm

2- Cell out of service

3- Diversity receive alarm

4- Radio link prompt alarm

5- TRX Communication alarm

6- TRX Config Mismatch alarm

7- TRX VSWR alarm

8- VSWR Prompt alarm

3- Alarm (Cont)

10- TRX Hardware Critical Alarm

11- Level 2 VSWR Alarm

12- Level 1 VSWR Alarm

13- Board Communication Alarm

1- Board Type Mismatch alarm

Description

This alarm is reported when the board inserted into the slot is not the Antenna and GSM type.

Reason Hardware:

- Insert wrong GSM type and card name. EX: Inside we use GSM900 but we insert GSM1800. And BTS site use card GRFU, but in BSC site configure card DRFU.

System:

- GSM type at site and BSC site are difference type. - Board name at BTS site and BSC configuration are difference name.

Solution

- Replace the board according to the system configuration.

- Replace the board according to the queried board type.

2- Cell out of service

Description

This alarm is generated when the hardware is faulty or lock cell.

Reason

Hardware:

- Faulty card DRFU/GRFU. - Module was damage

- Card DDPU, DTRU broken.

- TX cable loose connection or broken. System: (Click here for detail)

- Lock cell or cell not active. - Software not activated. Solution

- Swap card DRFU for test. - Replace DRFU card

- Replace Module and CPRI optic cable - Check port on GTMU card

- Check card DDPU or DTRU if faulty and Replace

new.

3- Diversity receive alarm

Description

- The alarm is reported when the gain of the diversity receive path smaller than that of the diversity receive path exceeds the relevant threshold.

Reason

Hardware:

- The connection of the RF cable is

loosened, broken, wrong configuration or damaged.

- The connection of Jumper is different Antenna port

on BTS and BSC

- The diversity antenna is not installed, and only the

single jumper is available.

- Card DRFU was damage.

System: (Click here for detail)

- The TRX is configured in Single Antenna and Double

Receiver mode is wrong.

- Wrong configured Sent Receive Mode in BSC

Solution

- Check if the configuration of the TRX is in BSC Sent

Receiver mode was configur.

- Check if only the single jumper is available.

- Check the RF cable connection between the TRX,

feeder, and antenna. If the cable is loosened, tighten the connector. If the cable is damaged, replace the cable.

- Replace card DDPU, DRFU, DTRU - Replace Antenna

3- Diversity receive alarm

Note:

- In system configuration

2TRXs set Antenna mode (Sent Receive mode

Double Feeder (2TX + 2RX) 1

2

4TRXs set Antenna mode (Sent Receive mode Single Feeder (1TX + 2RX) 1 2 One card DRFU have double

feeders One card _DRFU have single feeder

4- Radio link prompt alarm

Description

- This alarm is reported when the BTS detects

continuous RL abnormalities. The power level imbalance between uplink and downlink. It indicates that the uplink power level and the downlink power level deviate from each other greatly.

Reason

Hardware:

● The connection of the RX cable is loosened, broken,

wrong configuration or damaged.

● Card DRFU was damaged.

Software: (Click here for detail)

- Wrong Configure between BSC and BTS - Wrong Receive Mode and Sent Mode (If

Config 2TRX must be configure Dividing Receiver and No combine)

- Wrong Downlink tributary on configure of

DDPU (Uplink/Downlink/Tributary) Solution

- Check connection of the RF cable is connected. - Check configuration of RX cable is corrected. - Replace RX cable or card if faulty.

- Replace card DTRU/DDPU if male connector

broken. Note:

- Radio link prompt alarm have three Sublink No: 0:Abnormal channel activation alarm (Traffic normal)

1:Abnormal channel release alarm (Traffic normal)

2:No traffic alarm (Traffic warning have to reset site)

3:Power level imbalance between uplink and downlink alarm (Wrong RX configuration)

5- TRX Communication alarm

Description

- This alarm is reported when the TRX detects that the transmitting/receiving

phase-locked loop or the test phase-locked loop in the TRX cannot output the required frequency.

Reason

- The connection of the Jumper cable is loosened or broken.

- CPRI optic cable is loosened or broken. - Insert CPRI optic cable incorrect to the port of DRFU and GTMU port.

- DRFU is faulty.

- TX cable loose connection between DDPU to DTRU or broken.

- Card DTRU or DDPU faulty. Solution

- Reset site

- Check CPRI cable if installed - Check card DRFU is faulty - Check Jumper if installed

- Replace card DRFU or CPRI cable if faulty - Replace DDPU, DTRU if broken.

- Check TX cable if loose connection between DDPU and DTRU.

- Replace TX cable - Reset site

6- TRX Config Mismatch alarm

Description

The alarm is reported when any of the

following conditions occurs: (1) The frequency of the TRX is not consistent with the type of the

TRX. (2) The static power of the TRX is lowered by the main control module to protect

Reason

● Hardware:

- Wrong GSM card (Bandwidth)

(GSM900/1800) of Card DRFU/GRFU (Insert wrong GSM card)

- Insert wrong CPRI cable wrong slot on card

GTMU.

- Patch E1 wrong site (Mean: E1 of Main site

patch for Cosite and E1 of Cosite patch for Main site)

- Software:

- Wrong Sent Receive Mode of Antenna

- The type of the board in the slot is different

from the configured board type on the BSC side

- The RF front end power is small.

- Frequency and TRX type mismatch.

Solution

- Check Frequency on BTS and BSC are the

same

- Check Sent Receive Mode on BSC and BTS

are the same.

- Check card DRFU/GRFU was install correctly .

6-

TRX Config Mismatch alarm (Cont)

Solution Software:

● View alarm:

● Click on site name and than click on card of cell by

right click on card DRFU/GRFU => View Site Board => Configure Site Board Attributes => View on Sent Receive Mode => Single Feeder (1TX + 2RX)

● Not: If you see this mode you must be change it to

Double Feeder (2TX + 2RX) if site configured 2TRX.

● Solution: (Click here for detail)

● Right click on site at left panel => Configure Site

Board Attribute => Configure Site Board Attribute => Configure Site Board Attribute = Sent Receive Mode (Double Feeder (2TX + 2RX)) => OK => OK => Finish. And than Reset site.

7- TRX VSWR alarm

Description

- This alarm is generated when the cables concerning

the power output port of the TRX (TX1, TX2, TCOM) are not properly connected.

- This alarm is generated when the antenna jumper is

not connected to the antenna port of the Carrier Module.

Reason

- The cable between the power output port of the TRX and the power input port of the RF front-end unit (DDPU) is damaged.

- The connection of the Jumper cable is loosened or broken.

- The CPRI cable is not connected between DRFU to GTMU

- Feeder faulty. Solution

- Reset site

- Check whether the connections between the modules and the cable connectors are loose. - Check CPRI cable if loosened or broken.

- Change Jumper, CPRI cable, Feeder, or card if faulty

- Check the values of VSWR level between BTS and BSC

8- VSWR Prompt alarm

Description

- If the VSWR of the antenna system

exceeds the Carrier Module VSWR warning alarm threshold, the VSWR warning alarm is generated.

Reason

- The connection of the Jumper cable is loosened or broken.

- Carrier Module (DRFU) is faulty

- Feeder, connector of feeder and antenna was faulty

Solution

- Check the connector of the cable

connecting to the antenna port of the Carrier Module.

- Check the connector of the cable connecting to the antenna port.

- Replace the jumper of the antenna system.

- Replace the Carrier Module. - Replace the antenna.

9- SFP Port Inconsistency Alarm

Description

- The SFP port configuration on the RXU Chain of the BSC is inconsistent with the physical connection.

Reason

- Topology configuration on the SFP port is inconsistent with physical connection.

- CPRI chain/ring on the SFP port is disconnected.

- A CPRI port on the GTMU chain/ring on the SFP port is blocked.

- Card DRFU faulty. Solution

- Reset card GTMU if not clear

- Remove CPRI cable if the port on GTMU is not used.

- Check connection of CPIR cable between DRFU and GTMU is corrected.

9- SFP Port Inconsistency Alarm

GTMU

10-

TRX Hardware Critical Alarm

Description

The alarm is reported when any of the following conditions occurs:

1. The TRX phase-locked loop is faulty, which causes

the TRX unavailable.

2. The power unit, power amplification unit, flash

memory or RF module is faulty, which causes the TRX unavailable.

Reason:

-. Card DRFU/GRFU was damage. -. RF cable (CPRI) broken

-. Card not run yet download software from BSC

Solution

-. Reset card DRFU/GRFU.

-. Check CPRI cable and GTMU port -. Replace CPRI cable is faulty.

11-

Level 2 VSWR Alarm

Description

The DUP Unit reports a VSWR alarm when detecting that the VSWR on antenna port A or antennal port B is greater than Serious Standing Wave Radio Alarm Threshold

(default Value: 3.0). Reason:

● Hardware:

-

The  VSWR  of  the  antenna  system  is

 too  high value.

-

TRX Communication cable between

card duplexer unit (

-

The  Carrier  Module  (DDPU)  is

 faulty.   

-

The  Feeder,  Connector  or  Jumper  is

 broken

-

The  Antenna  was  faulty  or

 damaged  

-

The  connections  between  the

 jumper  and  the  duplexer  (DDPU)

between  the  jumper  and  the  feeder,

 between  the  jumper  and  the   surge

protection  unit  and  between  the

11-

Level 2 VSWR Alarm (Cont)

Solution:

- Check  the  connections  between  the  jumper

 and  the  duplexer unite,  between  the  jumper  and  the  feeder,  between  the  jumper  and  

the  surge  protection  unit,  and  between  the  jumper  and  the  antenna.  

- Check  whether  the  water  leaks  into  the

 connectors  between  the  jumper  and  the  duplexer,  between  the  jumper  and  the  feeder

- Replace  the  connector  where  water  leakage

 occurs  and  conduct  waterproof  protection  on  the  new  connector  in  compliance  with  related  

engineering  standards.   

- Check  card  DDPU/DRFU  is  faulty  

- Check TX cable between card duplexer unit

(DDPU) and card transceiver unit (DTUR) was

broken or damage. (Level 1 VSWR Alarm)

- Change new TX cable is broken. (Level 1 VSWR

Alarm)

- Replace  new  DDPU/DRFU.  

- Replace  new  feeder  

- Replace  new  Antenna  

13-

Board Communication Alarm

Description

This alarm is reported when the main controlling module detects abnormal

communication between it and the radio frequency (RF) front module.

Reason:

Hardware:

Card DDPU was broken.

Power cable of DDPU connected to DAFU is broken.

Communication cable between card DSCU and DCCU to the top DSCB card are broken or loose connection.

Solution:

Check power cable connect between the Front-End unit to DAFU

Check card DDPU is abnormal

Check Com cable connect between DSCU, DCCU and the top of DSCB are connected. Swap card DDPU for test card.

14-

DBUS alarm

Description

This alarm is reported when the DBUS clock of the TRX is abnormal or the TRX

hardware detects that the DBUS signal sent by the main control module is lost.

Reason:

● Hardware:

● DTRB Cable on card DSCU connected to DSCB

are loose connection.

● Tran cable on card DCCU loose connection or

broken.

● Subrack of DTRU was damage.

● The DBUS cable connected from Subrack DTRU

to DTMU are not connected.

Solution:

● Check connection between subrack transceiver

to common subrack are connected.

● Card DTRU high temperature is the problem.

● Change DBUS cable is we can. (DBUS cable

connect with Subrack DTRU (Behind subrack DTRU

card) to Common subrack.)

4- Configuration BTS3012

Typical configuration S2/2/2 (No combining mode ）

Typical configuration 2/3/3 no share card

Typical configuration 2/3/3 share card slot 4

Typical configuration 4/4/4

CPRI_0 CPRI_1 CPRI_2 CPRI_3 CPRI_4 CPRI_5 4- Configuration BTS3900

Typical configuration 2/3/3 no share card

4- Configuration BTS3900 (Cont)

Typical configuration 2/3/3 share card slot 4

4- Configuration BTS3900 (Cont)

Typical configuration 4/4/4

4- Configuration BTS3900 (Cont)

Thank You

Name: PHOEUNG SARIM E-mail:

[email protected] Tel: +855977292888