10. cdma btstroubleshooting

1

HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

www.huawei.com

Internal

OR044 CDMA BTS3606E Troubleshooting

ISSUE 1.0

HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved

References

� BTS3606E Technical Manual

� BTS3606E Hardware Description Manual

� BTS3606E Maintenance Guide

2


Upon completion of this course, you will be able to:

�Login in to the BTS in Telnet or LMT mode

�Query the BTS alarms

�Trace the power and RSSI , and locate the RF problem

�Test the link quality of the Abis interface

�Replace the BCKM, BCIM , CCPM, TRM and CDDU boards


Chapter 1 Logging in to the BTSChapter 1 Logging in to the BTS

Chapter 2 Troubleshooting CasesChapter 2 Troubleshooting Cases

3


Chapter 1 Chapter 1 Logging in to the BTSLogging in to the BTS

1.1 Maintenance Mode1.1 Maintenance Mode

1.2 Logging into the BTS1.2 Logging into the BTS


Local Maintenance Software

� LMT Software

�Used to maintain the whole BSS

�Started through the workstation (WS)

of the M2000 or BAM.

� Telnet Software

�Used to maintain a single BTS

�Used when :

− LMT software is unavailable.

− Special test operations are required

4


Chapter 1 Chapter 1 Logging in to the BTSLogging in to the BTS

1.1 Maintenance Mode1.1 Maintenance Mode

1.2 Logging into the BTS1.2 Logging into the BTS


Logging in to the BTS

� Physical connections:

Logging in to the BTS Remotely in the LMT Mode

LMT BAM BSC/RAC BTS3606-1

192.168.*.* 10.12.3.128 129.*.10.1 129.*.10.*192.168.*.* 10.12.3.*

129.*.10.*

BTS3606-2

5



� Operation Procedure

�Step 1 Select Start > Programs > iManager M2000 > LocalWS.

The Local NE Management System dialog box appears.

�Step 2 Click Configure to add the IP address of the BAM.

�Step 3 Select the BAM that is to be logged in to. The system

starts the service maintenance system and the User Login dialog

box appears.

�Step 4 Enter the valid user name and password.

�Step 5 Click OK.

� -End

Logging in to the BTS Remotely in the LMT Mode



� Physical connections

Logging in to the BTS Locally in the LMT Mode

LMT BAMBSC/RACBTS3606-1

10.12.3.*129.*.10.*172.16.16.16172.16.*.* 129.*.10.1 10.12.3.128

BTS3606-2

6




� Step 1 At the WS of the BAM side, execute the command STR

CBTSRVSMNT to start the reverse maintenance.

� Step 2 At the WS of the BAM side, add the WS and set the

command authority for the WS at the BCKM side.

� Step 3 At the WS of the BCKM side, run the near-end NE

management system or LMT software to log in to the BTS. The

BAM IP address that you set when logging into the BAM must

be the IP address (172.16.16.16) of the BCKM Ethernet port .

� Step 4 After the maintenance is complete, execute the command

STP CBTSRVSMNT to stop the reverse maintenance.

� ----End

Logging in to the BTS Locally in the LMT Mode



LMT Interface

7



� Physical connection

Logging in to the BTS Locally in Telnet Mode

LMT BTS3606-1

172.16.16.16172.16.*.*




�Step 1 Use crossover cables to connect the portable computer and the

BCKM Ethernet port.

�Step 2 Start the Telnet client and use the following username and

password to log in to the OMU:

− Username: system

− Initial password: system

�Step 3 Execute the command opnday to enable type-ahead function.

�Step 4 Execute the MML commands in the Telnet window to maintain

the BTS.

�Step 5 After the maintenance is complete, close the Telnet window.

� ----End

Logging in to the BTS Locally in Telnet Mode

8



� Physical connections

Logging in to the BTS Remotely in the Telnet Mode

LMT BAM BSC/RAC BTS3606

192.168.*.* 10.12.3.128 129.*.10.1 129.*.10.*192.168.*.* 10.12.3.*




� Step 1 In the service maintenance system, execute the command STR

BTSTELPROXY to enable a Telnet agent for the BTS to be maintained.

� Step 2 In the Run dialog box, execute the command telnet: hostname port.

− The hostname refers to the IP address of the BAM. The port refers to the

port number set in step 1.

� Step 3 After the Telnet is connected to the BCKM, use the following user name

and password to log in to the BTS:

− Username: system

− Initial password: system

� Step 4 Execute the MML commands in the Telnet window to maintain the BTS.

� Step 5 After the maintenance is complete, close the Telnet window.

� Step 6 In the service maintenance system, execute the command STP

BTSTELPROXY to stop the BTS Telnet agent.

� -End

Logging in to the BTS Remotely in the Telnet Mode

9


Questions

� How to login in to the BTS in the local LMT mode?

� How to login in to the BTS in the local telnet mode?

� What is the difference between the LMT and the telnet mode?


Chapter 1 Logging in to the BTSChapter 1 Logging in to the BTS

Chapter 2 Troubleshooting CasesChapter 2 Troubleshooting Cases

10


Fault Locating

� Software fault

− Data configuration fault

− Not matchable version of software or data configuration file

− Program run error

� Hardware fault

− Transmission or clock fault

− Board damage (replace the damaged one with a board of the

same software and hardware version and conduct test)

− Backplane slot fault: Select another slot and conduct test

(modify the corresponding data)

When the running state of the system is abnormal, consider the

following factors:


Operation & Maintenance Process

Common maintenance process of BSS system:

Obtain system

running information

Judge system

running stateHandling

View alarm

information

View indicators

View traffic

statistics

Subscriber complaint

Alarm

analysis

Traffic statistics analysis

Fault judgment

Check line

Adjust parameters

Reset board

Replace parts

11


Common Troubleshooting Procedure

There are current

alarms

Query current

BTS alarm

Clear current

alarms

Take measures to

solve the problem

END

N

Y

START

Judge the type of

problem through the

symptoms

Any other current

alarms YN

• LST ALMFE to query

current alarms

• Clear the alarms

according to the

suggestions in alarm

management system

• Power supply and environment monitoring faults

• Clock system faults

• Abis interface faults

• RF system faults

• Clear the alarms

according to the

following

troubleshooting guide


�� Power Supply FaultsPower Supply Faults

� Clock System Fault

� Abis Interface Fault

� RF System Fault

Basic Troubleshooting Considerations

12


Power Supply Fault - Mains Phase Loss

� Symptom:

� The BTS reports “Power Supply Alarm”. The alarm description is “The AC

power loses phases”.

� Troubleshooting:

Power switches on

On site power

supply normal

Check the power switches

Check power supply on site

Turn power switches on

Power Supply

alarm solved

END

N

Y

Correct connections

Power supply

connections ok

Check power supply

connections

Correct power

maintenance engineers

to solve the problem

Y

N

YN

• AC/DC power subrack

power switches on

• SPARE switches on• Power supply of the

site cut off

• Use multimeter to

measure the voltage • Check

connections

of power

cables in the

lightening

protection and filtering unit


Power Supply Fault - PSUAC/DC Fault

� Symptom:

� The BTS BTS3606A reports the “PSUAC/DC Alarm”.


PSU faulty

On site power

supply normal

Check the PSU

Check power supply on site

Modify

configuration

Power Supply

alarm solved

END

N

Y

Correct connections

Power supply

connections ok

Check power supply

connections

Correct power

maintenance engineers

to solve the problem

Y

N

YN• DSP CBTSPMUPSU to

check whether the

PSUAC/DC number is

consistent with its physical location

Configuration ok

Check PSU configuration

NY

Replace

faulty PSU

13


� Power Supply Faults

�� Clock System FaultClock System Fault


� RF System Fault



Clock System Fault – Satellite Antenna Fault

� Symptom:

� The BTS reports the alarm “BCKM Satellite Antenna System Faulty”. The

alarm description is “The satellite antennas are open-circuited and satellite

signals are weak”, or “Antenna connection short”.


Alarm cleared

It is normal

Short circuit the

lightning arrestor

Check output voltage

of satellite receiver

END

Y

N

• If connectors rusted by water

• If the lightning arrester is

inversely connected.

• If the lightning arrester is faulty

N

Troubleshoot the

lightning arrestor N

Check the connections of

GPS antenna

Cables intact

Y

Replace the

satellite receiver

Replace the GPS

antenna

Replace the feeder

or jumper

Y

• Remove connector for “ANT” port on the BCKM

• Measure the voltage output by the

GPS satellite receiver to the GPS

antenna using a multimeter >= larger

than 4.8 V.

• Insulation and short

circuit

• Conductor of the feeder is broken

• Check the white short

cable between the GPS

receiver and BCKM

panel

14


Clock System Fault – Insufficient satellites

� Symptom:

� BTS reports the alarm “BCKM Satellite Antenna System Faulty”. The alarm

description is “Insufficient satellites being tracked”.


Preset GPS coordinate

differ from actual

Query the BCKM

special board status

END

Y

N

Set the actual

position of BTS

• DSP

CBTSBRDSPECSTAT to

query the BCKM special

statuses.

Relocate GPS

antenna

• SET CBTSINITPOS to set

the position information for faster tracking

• Relocate the GPS

antenna based on

standard• Middle of rooftop

• No obstacles

within 90 degrees




�� AbisAbis Interface FaultInterface Fault

� RF System Fault


15


Abis Interface Fault – Link Fault

� Symptom:

� The BTS reports E1/T1 alarms, such as “BTS E1/T1 Link Faulty” or “BSC

E1/T1 Link Faulty”.


Power supply or

transmission equipment

faulty

Check Power supply

and transmission

equipment

END

Y

N

Troubleshoot and

clear this fault

• DSP CBTSTSTTSK to query whether

the E1/T1 port at the BTS side is in

the loopback test or link test status

• LST LOG

• DSP FELNK, DSP PPPLNK, DSP

MLPPPLNK

Check E1 status

E1 in loopback status

Y

Stop loopback

N

Loopback section by

section to locate fault

• STP CBTSTSTTSK

to stop the test

• SET LPBACKE1T1

to stop the loop

• The board involved with the

transmission link is faulty.

• The connector is in poor connection.

• The cable is damaged


Abis Interface Fault – Unstable Link Fault

� Symptom:

� The BTS frequently reports the alarm “E1/T1 Bit Error Rate Too High”.

� The transmission link is often temporarily interrupted and then recovered.

� The link status query result contains the exceptional statuses such as the

frame or multi-frame out-of-synchronization.


Transmission

equipment faulty

Check transmission

equipment

END

Y

N

Troubleshoot and

clear this fault

Check DIP switches of

BCIM and BESP

DIP switch ok

N

Correct DIP switch

Y

Change grounding or

E1 connectors• All ON for 75ohm

Check grounding of DDF

and E1 connectors

Meet requirementsLoopback section by

section to locate fault

N

Y

16


Abis Interface Fault – O&M Fault

� Symptom:

� The LMT cannot send O&M commands to the BTS successfully. The status

of the BTS is offline.


Link consistent with

physical connectionRoutes are correct

Query E1 links status

Query the IP route in

the BAM and CSWS

Correct the configuration

Ping the BTS IP address

from BAM

END

N

Y

• LST CBTSLNK

• Ping the IP address to check

whether the communication

between BAM and CMPU is normal. C:\>ping 10.12.3.64

N

Correct the routing

Query E1 links configured

to BTSDSP FELNK

DSP MLPPPLNK

• C:\>route print. Result should

have route to the CMPU for 129.x.x.x IP segments

• LST SWIPRT. Result should

have route to CMUX of CIPS

for 129.x.x.x IP segments

• C:\>route –p add 129.x.x.x

mask 255.255.255.0

10.12.3.64

• ADD SWIPRT

Y

• LST BTS

• LST IPOAPVC to

query IPoA

information

• DSP BTSBTPINFO

• LST FRMPRTMAP

• Ensure all

parameters match

Query IPOA data

configuration and

BootP configuration

Configurations are

consistent

Y


N


Abis Interface Fault – Signaling Fault

� Symptom:

� The BSC reports the alarm “Abis Signaling Link Disconnected”.



physical connectionRoutes are correct


Query the IP route in

the BAM and CSWS


Alarm cleared

END

NY

• LST CBTSLNK

N

Correct the routing


to BTS

• C:\>route print. Result should

have route to the CMPU for 80.x.x.x IP segments

• LST SWIPRT. Result should

have route to CMUX of CIPS

for 80.x.x.x IP segments

• C:\>route –p add 80.x.x.x

mask 255.255.255.0

10.12.3.64

• ADD SWIPRT

Y

• DSP CBTSIFCFG to

query BTS interface

configuration

• LST IPOAPVC to

query IPoA

information

• Ensure all

parameters match

Query IPOA data

configuration

Configurations are

consistent

YN

• RMV CBTSTERSIGLNK

• ADD CBTSTERSIGLNK

Correct the

configuration

BSC or BTS

board faulty

• CSPU, CRMU

• BCKM

DSP FELNK

DSP MLPPPLNK

17


Abis Interface Fault – Traffic Fault

� Symptom:

� The BTS reports the alarm “No Traffic Link Exist”.



physical connectionConfigurations ok


Query the traffic

configurations


END

NY

• LST CBTSLNK


to BTS

• DSP CBTSIFCFG

• LST BTSLNK

Y

N

• RMV CBTSTERTRFLNK

• ADD CBTSTERTRFLNK

Correct the

configuration

BSC or BTS

board faulty

• CFMR

• CCPM

Alarm cleared

DSP FELNK

DSP MLPPPLNK





�� RF System FaultRF System Fault


18


RF System Fault – Insufficient Forward Power

� Symptom:

� The network signal received by handsets is rather weak. It is easy to cause

call-drops. The BTS coverage area shrinks.


VSWR normal Result okTrace the

transmit power

Check antenna system

and correct fault

END

NY

• Sitemaster

• Result <1.4

Check VSWR • str infotrace

YN

• CDDU cable

connections Check CDDU

connections

• The feeder is connected to

the wrong RF output port.

• The feeders are cross-

connected

• Feeders

and jumpers

• Antenna

N

Connection ok Correct

connections

Check feeder

connections

N

Connection okCheck configurations

of network parameters

Correct

connections

Replace

CDDU

Y

Correct

configuration

N

Configuration ok

Y

Y

• Antenna azimuth

• Antenna downtilt

• Other RF parameters


RF System Fault – Difficult Access

� Symptom:

� The network signal is strong, but the subscriber access success rate is low

and the call-drop rate is high.


RSSI normal

Start RSSI test

END

Y

N - Lower

• str infotrace• With on-going calls, average mains RSSI

ranges from –100.0 dBm to –108.0 dBm.

• With no on-going call, the load is zero, the

average RSSI ranges from –105.0 dBm to –

111.0 dBm.

N - Higher

Check antenna system

and cable connection and

correct fault

Check and clear

interference

Check configurations

of network parameters

and correct any fault

• RF parameters

• Connectors are in

good contact.

• If the main and diversity RSSI values

differ a lot, check the

cable connections of

the antenna system

with the smaller

RSSI

• Check whether the antenna

installation position meets the

requirements.

• If with lightning arrester, short and

check the RSSI.

• Use a spectrometer to trace the

spectrum of the external

interference source.

19


Summary

� Logging in to the BTS

� Maintenance

� Troubleshooting skills

www.huawei.com

Thank You

10. cdma btstroubleshooting

Documents

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reverse maintenance