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Optical Network Curriculum
Development Section
ISSUE
OTC000301 DWDM SystemTroubleshooting
1.3
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1Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
1.Basic methods of fault localization
2.Classification of fault processing
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2Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
1.Basic methods of fault localization
2.Classification of fault processing
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3Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Requirements for Maintenance Personnel
Familiar system signal flow
Knowing well about hardware configuration
Collecting and storing the data during normalrunning situation
Collecting and storing the on-site data (when
faulty)
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4Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Basic Thoughts
The key step is to locate the fault to acertain cable or a station or a exactboard accurately.
Why Trouble
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5Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Basic Principles
Locate the fault:From external to internal
From wavelength adding &dropping sites to middle
sites ,and then to specific sub-rackAnalyze alarms from high level to low level
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6Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Common Methods
1. Alarm and Performance Data Analyzing
2. Testing With Instruments
3. Replacement
4. Loop-back Method
5. Experienced Processing Method
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7Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
A B
S D H TWC
RWC
M32/M40
D32/D40
WBA
WPA
WPA
WBA
D32/D40
M32/M40 S D H
TWC
RWC
One of the channel f rom A to B i s inter rupted !
How can we
locate the fault
S D H
TWC
RWC
S D H
TWC
RWC
Alarm and Performance Data Analyzing
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9Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
1. Optical spectrum analyzing (wavelength ,optical
power ,OSNR)
2. Optical power meter ,SDH analyzer
3. If possible ,compare power from performance in
NMS with power from instrument
4. MON port is available for on-line test
Testing With Instruments
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10Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
S D H
A
B
TWC
RWC
Alarm: LWC/TWC/OCU R_LOS
Measure receiving power of LWC/TWC/OCU .
Check Tx of SDH ,and patch cord betweenSDH&OTU ,Rx of OTU
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11Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Replacement Method
1. Board (OTU ,OA) 2. Fiber3. Connector4. Modules5.
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12Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
S D H
A
B
TWC
RWC
S D H
C
D
TWC
RWC
Exchange thereceiving signal of twoTWC,then observethem.
Alarm: TWC RLOS
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13Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
If there is still R-LOS,
Rx of TWC?
If there is R-LOS alarm on the
other TWC,Tx of SDH ?Patch cord?
S D H
A B
TWC
RWC
S D H
C
D
TWC
RWC
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14Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Loopback Method
Tx1
Tx2
Txn Rxn
Rx2
Rx1OM/OA
Rx1
Rx2
Rxn Txn
Tx2
Tx1OLA OM/OA
OA/OD
OLA
OA/ODattenuator
attenuator
SDH
Analyzer
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15Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Loopback Method
S
D
H
S
D
H
TWC M32 WBA WPA D32
M32WBAWPAD32RWC
RWC
TWC
RWC
TWC
TWC
RWC
RWC repor ts RLOF alarm ,TWC is normal
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16Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Experienced Processing Method
Reset board
Plugging/unplug board
Re-send configuration (SCC replacement)
It i s recom m end ed to u se th i s method asless as po ss ib le , s ince i t i s u nsu i tab le forf ind ing fau l t reason thoro ugh ly.
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17Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
1.Basic methods of fault localization
2.Classification of fault processing
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18Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Classification of fault
1. NMS problems 2. Optical power problems
3. Error problems 4. Service interruption
5. Ecc problems 6. Order wire problem
7. Equipment interconnection problem
8.Other problems
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20Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Cases:SQL SERVER 7 is not started----
computer name is changed
User already logined---
Create different user names
Backup failed- ---
Unix:% /T2000/server/database/backupmo.batT2000%tar cvf mo_bak_XXXX.tar mo
PC:C:\T2000\server\database\Backupmo.batto \T2000\Server\database\mo
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21Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
2.Optical power problems
Common Causes :
Fiber or patch cord is deteriorated or too tight
Tx or Rx module of accessed equipment is faulty.
Tx or Rx module of OTU is faulty
OA is faulty
Optical components are deteriorated.
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22Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Common Methods:
Alarm and performance analyzing
Power adjustment
Instrument testing
Loopback
Replacement
Famil iar w i th the op t ical po wer sp ec i fica t ion of
OTU ,OA ,M32 ,D32 etc ,.
Optical power problems
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23Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Optical power problems
S
D
H
S
DH
TWC M32 WBA WPA D32
M32WBAWPAD32RWC
A B
RWC
TWC
RWC
TWC
TWC
RWC
IN-PWR-LOW alarm is
detected ?
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24Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Optical power problems
The col lec ted perform ance data atdifferent t im e are l is ted below.
What happ ened?
S
D
H
S
D
H
TWC M32 WBA WBA WPA D32 RWC
TWCM32WBAWPAWBAWPAD32RWC
A B C
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25Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Optical power problems
BoardWPA
in
WPA
out
WBA
in
WBA
out
A
From B -15.6 7.0
To
B
-9.2 14
B
FromC
-14.6 7.8
To
C
C
From
B
-14.3 7.6
To
B
-9.0 14.4
Board
WPA
in
WPA
out
WBA
in
WBA
out
A
From
B
-20 -3.4
To
B
-9.2 14
B
From
C
-19.6 3.2
To
C
C
From
B
-14.3 7.6
To
B
-9.0 14.4
Firs t t ime Seco nd t im e
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26Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
3. Error problems
Common Causes :SDH Tx or Rx is wrong
Power is too high or too low ,Attenuation
Dispersion limitation
OSNR too low-------signal power is too low ornoise is too serious
Tx or Rx of OTU board
OA is faulty--------pump?FEC function is faulty
E bl
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27Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Error problems
Common Methods:
Alarm analyzing
Error performance monitoring
Instrument test
Power adjustment
Replacement method (board ,patch cord)
..
E bl
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28Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
S
D
H
S
D
H
TWC M32/M40 WBA WPA WBA WPA D32/D40 RWC
TWC M32/D40 WBA WPA WBA WPA D32/D40 RWC
A B C
Bit errors are generated in services from A to C.
Error problems
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30Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
4.Service interruption problems
Common Causes :Optical line cable is faulty or patch cord is notwell connected
Board is fault
Rx of OTU is unstable
Tx of OTU is faulty
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31Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Service interruption problems
Common Methods:Analyze the faulty direction ,status of OSC channel andmain channel , number of faulty wavelength channel
Alarm analyzing and performance monitoring
Instrument test (on-line measurement)
Power adjustment
Replacement method (board ,patch cord)
..
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32Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Service interruption problems
2 3
O
TM
O
L A
O
TM
1
100Km 90Km
RLOS i s d etected in
OTU at receiver sid e ?
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33Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
5. Ecc problems
Common Causes :Power supply is faulty
SCC unit fault
SC1 or SC2 board faultHUB problem network cable connection
Fiber connection
ID or IP problemsECC channel is blocked.
Ecc problems
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34Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Ecc problems
Common Methods:
Alarm and performance analyzing method.
Reset SCC board.
Replacement method
..
ECC bl
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35Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
ECC problems
Station A can not login station B and C normally.
NMS
A CB
ECC bl
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36Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
ECC problems
After replacement of SCC board at station B ,
It is found station A and B can be logined normally,but station C cannot.
NMS
A CB
6 Order wire problem
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37Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
6. Order wire problem
Common Causes:
External factors -- such as power failure, brokenfiber and so on.
Wrong setting of telephone set .
Wrong OHP configuration data.
Board faults -- such as SC1, SC2 and OHP.
Order wire problem
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38Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Order wire problem
Common Methods:
Alarm and performance analyzingReplacement method
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39Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
Order wire problems AThe order wire from A to B and C isblocked, even stations B and C can notbe called by dialing the conferencetelephone from station A.
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40Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
7. Equipment Interconnection
WPA D32/D40 RWC
RWF
M32/M40 WBA
M32/M40 WBA
WPA D32/M40
TWC
TWC
RWC
RWC
TWC
TWC
A B
SDH-1
SDH-2
SDH-1
SDH-2
The services from A and B are blocked.
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41Confidential Information of Huawei.No Spreading without Permission. Security Level: Internal
8. Other problems
Accessing signal is not standard
Pointer adjustment
Special unit is faulty (VOA ,flange ,connectors)Instrument testing ( test method is wrong)
Label is wrong
HUB is faulty
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