optix wdm system troubleshooting issue1.0
TRANSCRIPT
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
1/75
1
Confidential Information of Huawei.
No Spreading without Permission.
OTC000301 OptiX WDM System Troubleshooting
ISSUE 1.0
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
2/75
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
3/75
Internal Use 3
Reference
OptiX BWS 1600G Maintenance Manual (Troubleshooting)
OptiX Metro6100 Maintenance Manual (Troubleshooting)
OptiX Metro 6040 User Manual
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
4/75
Internal Use 4
Operations for troubleshooting
Basic Thoughts and Methods of Fault Locating
Fault Handling Flow
Fault classification and location
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
5/75
Internal Use 5
WEST EAST
WEST EAST
EAST WESTWEST
EAST
EAST
WEST
Review Point
Left is defined as
west and right as
east in a chain
network.
The ring network takes
counter-clockwise direction
as the primary ring direction.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
6/75
Internal Use 6
Key Operations
Software Loopback
Cross Loopback
Hardware Loopback
Clean Optical Interface
Reset Board
Replacement of Board
Optical Power Test
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
7/75Internal Use 7
Software Loopback: Outloop
WDM siClient side
OTU Outloop
WDM sideClient side
OTUOutloop
Loop a received signal directly back to its
corresponding output port (WDM or client side).
It can be used to test the fiber line and
connectors.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
8/75Internal Use 8
Software Loopback: Inloop
WDM sideClient side
OTUInloop
WDM sideClient side
OTU Inloop
Inloop at client side of OTU
Inloop at WDM side of OTU
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
9/75Internal Use 9
Cross Loopback
WDM sideClient side OTU
Optical
transmitting
module
Optical
receiving
module
Optical
transmitting
module
Optical
receiving
module
A
B
C
D
1
1
2
2
Broadcast receiving signal at client side
to optical transmitting modules at both
client side and WDM side.
Broadcast receiving at WDM sideto optical transmitting modules at
both WDM side and client side.
Note: LWM and LWX boards support cross
loopback.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
10/75Internal Use 10
Hardware Loopback
Software
loopback
Hardware
loopback
Transmitting module
Receiving module
Tx
Rx IN
OUT
WDM sideClient side
Tx
Rx IN
OUT
WDM sideClient side
Fixed
Attenuation
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
11/75Internal Use 11
Reset Board
Reset by NM.
Reset by pressing the reset button on SCC board.
Reset by removing and inserting SCC board.
Reset by NM.
Reset by unplugging/ plugging the board.
Reset SCC Board
Reset Other Boards
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
12/75Internal Use 12
Clean Optical Interface
Make sure the fiber to be cleaned is disconnectedwith any active
component.Holdthe fiber connector, cleanthe surface with lens tissue, Do this once or
twice more using different parts of the tissue.
After the surface dries, use special compressed gas to blow the surface
Checkthe connector surface
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
13/75Internal Use 13
Optical Power Test
OTM
Optical power
meter
OTM
ININ
OTU OAMUX/
DEMUXFIU
IN IN
FIU OA MUX/
DEMUXOTU
ININ IN IN
ODFODF
Optical boardOptical power meter
OUT
IN
Fiberjumper
Testing
port
Optical boardOptical power meter
MONFiber jumperTesting
port
Optical
Power test
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
14/75Internal Use 14
Replacement of Board
Before replacement
During replacement
After replacement
Check board version
(Especially for OTU)
Detailed information
can be obtained from
the bar code.
Skilled at the operation methods in
General precautions.
The setting of board jumpers and DIP
switches;Input optical power range of optical
interface board;
Remove the optical fiber from the front
panel;
Width of the front panel.
Wear an ESD wrist
strap. Correctly swapthe board. Avoid short-
circuit of the board.
Prevent eyes from being hurt by the laser.
Check whether the
board is working
normally, and uploadconfiguration on the
NM again.
If you replace the SCC board, you shall
upload the original SCC configuration
data to the NM, and then download them
from the NM to the new SCC.
Pay attention to NE user configuration.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
15/75Internal Use 15
Classification of Board Replacement
Classification of
boards
Board name Remarks
Opticaltransponder unit
OTU For new OTU:a. The type is identical with the original one.
b. The wavelength, optical module is identical with that of
the original one.
Optical amplifier
unit
OA a. Prevent the over-high input optical power fromdamaging optical components.
b. Keep the operating band of the new optical amplifier
unit identical with that of the original one.c. Do not stare into the output optical interface, since the
output optical power of HBA, RPA/RPC/RPL is very high.
Optical
multiplexing/demu
ltiplexing &
add/drop
multiplexing unit
MUX/DEMUX a. Prevent the over-high input optical power fromdamaging optical components.
b. Keep the operating band of the new optical amplifier
unit identical with that of the original one.
c. Keep the type of the substitute board identical with thatof the original one.
Optical
supervisory
channel unit
SC1, SC2
TC1, TC2
a. The type of the substitute board is identical with that of
the original one and whether it supports LHP system
application.
b. The input optical power
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
16/75Internal Use 16
Operations for troubleshooting
Basic Thoughts and Methods of Fault Locating
Fault Handling Flow
Fault classification and location
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
17/75Internal Use 17
Requirements for Maintenance Personnel
Be familiar with DWDM system and troubleshooting of common alarms.
Professional in Basic Operations
Familiarity with Common Test Instruments
Awareness of Network Layout
Collection and Saving of On-site Data
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
18/75Internal Use 18
Basic Principles of Fault Locating
NoteThe key step is to locate the fault to a
certain cable or a station or an exact board accurately.
Why Trouble
External First, then Internal
Network First, then NE
High-severity Alarms First,
then Low-severity Alarms
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
19/75Internal Use 19
Common Methods of Fault Locating
Alarm and performance analysis
Test with instruments
Replacement
Loopback
Handling based
on experience
Al d f l i
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
20/75Internal Use 20
Alarm and performance analysis
From NMS
Comprehensive
The fault information about the equipments in the
whole network can be obtained.
Accurate
Current alarms, history alarms, occurrence time,and performance event data can be gotten.
Note:
If no obvious alarm or performance event is
reported, alarm and performance analysis is
useless.
Querying current or history alarms and performance data throughtransmission network management (NM) system
Querying current running status of the equipment through cabinet
& board indicators
How to obtain alarms and
performance
Features
From cabinet and board
Easy for operation on site
Faulty information is not detailed
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
21/75Internal Use 21
Alarm and performance analysis
SDHSDH LWFLWF
M40
D40
OAU
OAU
SC1 SC1
OAU
OAU
D40
M40
OTM
OTM
A B
SDH service between A and B is interrupted,
and SDH equipment in B does not receive
service or receives a lot of bit errors.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
22/75
Internal Use 22
Test with instruments
Used to remove external problems of the transmission equipmentor interconnection problems
Test meters: optical power meter, optical spectrum analyzer, SDH
tester and signal analyzer. .
1. Test MON port and measure optical
power, wavelength, OSNR directly, analyze
the gain flatness of the optical amplifier
board.
2. Compare with original data.
1.Compare with performance data from
NMS.
2.Avoid service interruption. MON port is
recommended for measurement.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
23/75
Internal Use 23
Replacement
LWF reports R_LOS
Features
SDH
TWF
RWF
A
B
LWF
R_LOS
An abnormal article is replaced with a normal one. If the
problem still exists, it means that this particular article isnot faulty and there may be some other problems.
The article might be a section of fiber, a board, a flange
or an attenuator.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
24/75
H dli b d i
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
25/75
Internal Use 25
Handling based on experience
Reset board
Plugging/unplug board
Restarting a single station after power failure
Re-send configuration (SCC replacement)
It is recommended to use this method as less as possible, since
it is unsuitable for finding fault reason thoroughly.
T bl h ti P d
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
26/75
Internal Use 26
Troubleshooting Procedures
Troubleshooting for External Faults
Clearing the fault of accessed client equipment (SDH, Ethernet etc.)
Clearing the optical fiber fault
Clearing the fault of power supply
Clearing grounding fault
Locating fault to a single station
Locating the fault to a boardCommon method
Replacement, meter
test, and loopback
Loopback
Replacement
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
27/75
Internal Use 27
Operations for troubleshooting
Basic Thoughts and Methods of Fault Locating
Fault Handling Flow
Fault classification and location
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
28/75
Internal Use 28
Fault Handling Flow
General fault handling flow
Emergency handling flow
Collecting and recordinginformation
Technical support
General Fault Handling Flow
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
29/75
Internal Use 29
General Fault Handling Flow
Summary and
fill out report
Fault
removed?
End
No
Yes
Start
Record fault symptom
Externalcauses Other handling
process
Work out solutionstogehter
Servicerecovery?
Running and observe
Faultremoved?
Analyze and
locate fault
Feed back to Huawei
Fault
removed?
Yes
Try to solve
No
No
Yes
No
Yes
Yes
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
30/75
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
31/75
Internal Use 31
Common Alarms And Causes
Board
type
Alarm Handling
Optical
Amplifier
Unit
MUT_LOS Power related alarm, mainly relevant to the received signal. Check whether
the optical power of upstream optical path and station is normal.
PUM_BCM_ALM,
PUM_COOL_ALM
Check whether the running of fan is normal;
Check whether the ambient temperature is over-high or over-low;
Board fault. The board needs to be replaced.
Optical
Multiplexer/
Demultiplex
er Unit
MUT_LOS Power related alarm, mainly relevant to the received signal. Check whether
the optical power of upstream optical path and station is normal.
LSR_COOL_ALM Check whether the running of fan is normal;
Check whether the ambient temperature is over-high or over-low;Board fault. If the service is affected, replace the board in time. If not,
replace it in a proper time.
OTU R_LOS,
IN_PWR_LOW,
IN_PWR_HIGH
Power related alarm, mainly relevant to the received signal. Check whether
the optical power of upstream optical path and station is normal.
R_LOF, B1_OVER,
B1_SD, B2_OVER,
B2_SD
Power related alarm, mainly relevant to the received signal. Check whether
the optical power of upstream optical path and station is normal.
In addition, if the module in the receiving end is faulty, these alarms will
also occur.
TF,
OUT_PWR_LOW,
OUT_PWR_HIGH
Mainly relevant to the transmitting part of the board. If the service is
affected, replace the board in time.
OTU LSR_COOL_ALM,
LSR_WILL_DIE
Check whether the running of fan is normal;
Check whether the ambient temperature is over-high or over-low;
Board fault. If the service is affected, replace the board in time. If not,replace it in a proper time.
C ll ti d R di I f ti
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
32/75
Internal Use 32
Collecting and Recording Information
Detailed name of the faulty office
Name and phone number of the contact
person
Name and phone number of the contact
person on siteExact time when faults happen
Equipment type and network type
Fault level and expected settlement time
Measures taken and results after faults occur
Report to
Huawei
Support
engineer
Technical Support
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
33/75
Internal Use 33
Technical Support
Huawei Technologies Co., Ltd.
Address: Administration Building, Huawei Technologies Co., Ltd.,
Bantian, Longgang District, Shenzhen, P. R. China
Postal Code: 518129
Website:http://www.huawei.com
Customer service mailbox: [email protected]
Technical support websitehttp://support.huawei.com,
Obtaining the Latest Technical Documentation
http://www.huawei.com/http://support.huawei.com/http://support.huawei.com/http://www.huawei.com/ -
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
34/75
Internal Use 34
Operations for troubleshooting
Basic Thoughts and Methods of Fault Locating
Fault Handling Flow
Fault classification and location
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
35/75
Internal Use 35
Fault Classification
Other Faults
Optical Power Abnormity
Bit Errors
Transient Service Interruption
Service Interruption
ECC Faults
Orderwire Faults
Equipment Interconnection Failure
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
36/75
Internal Use 36
Fault Classification
Optical Power Abnormity
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
37/75
Internal Use 37
Optical Power Abnormity
SDH
SDH SDH
SDH
SDH
SDH
SDH
SDH
OTU
OTU
OTU
OTU
MUX
DMUX
OA
OA
OSC
OA
OA
OSC OSC
OA
OA
DMUX
MUX
OTU
OTU
OTU
OTM OLA OTM
Optical power checking point
Category Effect
Optical power
is too low
The input optical power is below the
sensitivity.
Bit errors are generated.
Decrease of the input optical poweraffects optical signal-to-noise ratio.
The input optical power is below
ALS threshold.
Service is interrupted.
Optical power
is too high
The input optical power is above
overload power.
Bit errors are generated and
optical receiving components
are damaged.
pay attention to
optical power of
OTU and OA
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
38/75
Procedure of Handling Optical Power Fault
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
39/75
Internal Use 39
Procedure of Handling Optical Power Fault
Start
Transmission NM
Transmitting end
Receiving end
Is faultremoved? EndNo
Yes
1
2
3
4
5
6
7
8
9
10
11
12
Is input optical power ofOTU at "Rx" port abnormal?
Is output optical power ofOTU at "OTU" port abnormal?
Is input optical power of
OAU abnormal?
Is input optical power of FIU at"RC/RL" port abnormal?
No
No
No
No
No
Is input optical power ofOAU abnormal?
No
Is input optical power ofOTU
at "IN" port abnormal?
No
Is output optical power of
OTU at "Tx" abnormal?
NoIs the received optical power of
SDH equipment abnormal?
No
No
No
No
No
Is output optical power ofOAU abnormal?
Is output optical power of FIU at"OUT" port abnormal?
Is input optical power at "IN"port of FIU abnormal?
Is output optical power at "TC/
TL" port of FIU abnormal?
Is output optical power ofOAU abnormal?
13
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Contact Huaweifor help
Adjust VOA placed
before OAU
Remove the
fiber fault
Replace FIU
Remove the faultat client side
Adjust VOA placed
before OAU
Adjust fibers between
OAU and DMUX;
Replace OTU
Adjust fiber
between OTU and
SDH equipment
Replace FIU
Remove thefiber fault
Replace OAU
Replace OAU
Replace OTU
Adjust fibers between
DMUX and OTU
Case of Optical Power Fault Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
40/75
Internal Use 40
Case of Optical Power Fault Handling
Station A Station B
SDH SDHOTM OTM
Four wavelengths occupy CH4, CH8, CH12 and CH16 fromA to B, access 2.5 Gb/s SDH equipment.
Four 2.5 Gbit/s SDH equipments
generate RSBBE and bit errorsof other levels in the receiving
direction.
Four 2.5 Gb/s SDH equipments
have multiplex section backgroundbit error.
Case of Optical Power Fault Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
41/75
Internal Use 41
Case of Optical Power Fault Handling
SDHSDH LWCLWC M40
D40
OAU
OAU
SC1
OAU
OAU
SC2 SC1
OAU
OAU
D40
M40
OTM OLA OTMStation A Station B Station C
80km 80km
40-channel system configured with 16 wavelengths
RSBBE
performance event
generated in all
activated channels
from receiving
direction
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
42/75
Internal Use 42
Fault Classification
Bit Errors
Bit E
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
43/75
Internal Use 43
Bit Errors
Fault type Causes
External causes External interference
Equipment grounding problem
Optical power abnormity (over-high or over low) and OSNR deterioration
Dispersion tolerance problem (fiber type, DCM, dispersion design)
Non-linearity of optical fiber
Environment problem (extra-high equipment temperature)
Equipment faults OTU board (O/E,E/O, FEC module etc.) failure or performance deterioration.
Optical amplifier board failure or performance deterioration.
Abnormity of fan
Related alarms and performance events:B1_EXC, B2_EXC, B1_SD, and B2_SD alarms
BEFFEC_EXC and BEFFEC_SD alarmsRSBBE, RSES, RSSES, RSUAS and RSCSES
performance events
MSBBE, MSES, MSSES, MSUAS, and MSCSES
performance events
Bit Error Information
Bit Errors Fault Locating
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
44/75
Internal Use 44
Bit Errors Fault LocatingBit error handling
Transmission NM
Any external
interference?
Is optical non-
linearity severe?
Is fan abnormal?
Is board performancedegraded?
NO
1
5
6
7
Is bit error
removed?
End
Yes
Any grounding
problem?
Is optical power
abnormal?
Is fiber connection
problem?
2
3
4
8
NO
NO
NO
NO
NO
NO
NO
Is B1 at receive end
and transmit end the
same?
Is B2 at receive end
and transmit end the
same?
NO
Reduce the inputoptical power
Replace the fan
Replace the board
Remove theinterference source
Contact Huawei
for help
Remove the grounding
fault
Remove the SDH fault
See handling opticalpower abnormity
Go to step
Replace fiber, cleanconnector or reroute
N
Remove the SDH fault
9
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Methods:
Alarm and performance analysis
Section-by-section loopback
Replacement or meter test
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
45/75
Case of Bit Errors Fault Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
46/75
Internal Use 46
Case of Bit Errors Fault Handling
OTM OTMOLAOLAOLAOLA
Station A Station B Station C Station D Station E Station F
17dB 22dB 21dB 20dB 14dB
8 channels (CH1-CH8) of 2.5 Gbit/s services are
configured between station A and station B.
Bit errors occur in some
channels at station A (receivingfrom station F), the number of bit
errors are not stable.
Case of Bit Errors Fault Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
47/75
Internal Use 47
Case of Bit Errors Fault Handling
Dispersion
ProblemStation A Station B
SDH SDHOTM OTM
80km
During engineering acceptance, it is found that all LWF boardsat station A(receiving from station B) report a large number
of corrected errors.
In 15-minute performance data, thousands of RSBBE are reported.
The number of corrected LWF at station B (receiving from station A)
is small and there is no bit error.
Fault Description
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
48/75
Internal Use 48
Fault Classification
Transient Service Interruption
Transient Service Interruption
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
49/75
Internal Use 49
Transient Service Interruption
Transient service interruption refers to the transient loss of
signal at second level during transmission.
Fault type Causes
Line fault Optical fiber is broken or fiber
performance deteriorates.
Equipment
fault
The board is faulty or the optical
module on the board is in poor
contact.
Methods:
Alarm and performance analysis
Meter test
Replacement
Transient Service Interruption Fault Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
50/75
Internal Use 50
Transient Service Interruption Fault Handling
Is fault cleared?
End
Contact Huawei for
helpNoGo to proper step
Yes
N
Transient service
interruption handling
Is the interruption
bidirectional?
Is OSC interrupted
transietly?
Transmission NM
Yes
No
Yes
No
No
Yes
1
2
3
4
5
Remove optical
fiber fault
Remove external
abnormity
Remove faults at
fiber and TX board
Remove faults
located before OAU
Remove optical
fiber fault
Is output optical power
of OAU at TX stable?
Any external abnormity?
Yes
6 Remove faults at
OAU, OTU and
connection fiber
No
Yes
No
Yes
NoIs intput optical power
of OAU at RX stable?
Is input optical power
of OTU at RX stable?
TX: Transmitting end
RX: Receiving end
Transient Service Interruption Handling Techniques
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
51/75
Internal Use 51
Transient Service Interruption Handling Techniques
Transient service interruption occurs
to the main optical path
If the R_LOS alarm occurs to the supervisory
channel and main optical path simultaneously. if the R_LOS alarm does not occur to the
supervisory channel, but to the main optical
path in two directions.
If the R_LOS alarm does not occur to the
supervisory channel, but occur to the main
optical path in one direction
Check along the signal flow whether the
optical signal is interrupted transientlyTransient service interruption occurs
to single channel
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
52/75
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
53/75
Internal Use 53
Service Interruption
Service Interruption
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
54/75
Internal Use 54
p
Fault type Causes Remarks
External
causes
Power failure
Abnormal environment (temperature andhumidity)
Abnormal optical fibers and connectors
When such
alarms as R_LOS,R_LOF and
R_OOF occur, it
indicates that the
service is
interrupted.
Equipment Board performance deterioration or failure
OTU,OA,MUX/DEMUX fault
Optical power
abnormity;
Fiber is broken, f iber connectors are dirty, Fiber
connectors are in poor connection, Attenuation
is too high. )
Bit error Excessive bit errors (Board fault or poor
performance, Dispersion tolerance, Non-
linearity of optical fiber.)
Equipment
interconnection
Interconnection between DWDM equipment and
other equipments are abnormal
Methods:
Alarm and performance analysis
Meter test
Replacement
Service
interruption
Service Interruption Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
55/75
Internal Use 55
p g
Service interruption handling
Transmission NM
Remove the fault
Is servicerecovered?
EndContact Huawei for help
Go to proper step
Yes
N
Replace theboard
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Is power supplyfailed?
Is environment
abnormal?
Is optical powerabnormal?
Is accessequipment faulty?
Is there lots of biterrors?
No
No
No
No
1
2
3
4
5
Is the board perfor-13mance degraded?
No6
Remove the fault
Remove the faulton the line
Remove the fault
Eliminate biterrors
Case of Service Interruption
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
56/75
Internal Use 56
p
OTM OTMOLA
Station A Station B Station C
Note: In a chain network, only one 2.5 Gbit/s service is configured
LWC at station C reportsR_LOF alarm continuously, and
the service is interrupted.
Case of Service Interruption
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
57/75
Internal Use 57
OTM OADMOADM
Station A Station B Station C Station D
OTM
Station A
Station B
Station C
Station D
OTM
OADM
OADM
OTM
W
E
E
W
E
W E
W
p
The chain is changed into ring network in terms of actual requirements. and1+1 channel protection is required.
Back-to-back OTM
Back-to-back OTM
Serial OADM Serial OADM
After interconnection between
stations A and D, all services are
interrupted, but no alarm occurs.
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
58/75
Internal Use 58
ECC Faults
ECC Faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
59/75
Internal Use 59
ECC Faults
ECC principle:NM should first communicate with the gateway NE over
TCP/IP, then gateway NE communicates with non-gateway NEs via ECC.
Methods:
Alarm and performance analysis
Configuration modification
Fault
type
Causes
External
causes
Power failure.
Optical fibers or connectors are abnormal.
Humanfactors The DIP switch setting is not changed whenreplacing the SCC board, resulting in repetition of
NE ID in the network.
Setting error.
Incorrect fiber connection.
Equipme
nt faults
Mismatch of SCC board type.
Board failure.
Network cable or HUB is damaged.
NEs report a large amount of performance data to
the NM, causing the ECC to be blocked.
ECC Faults Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
60/75
Internal Use 60
g
ECC fault handling
Is power supply failed?
Is optical fiber faulty?
Is NE ID repeated?
Is SCC type ismatched?
Is OSC/OTC faulty?
No
No
No
No
Yes
Yes
Yes
Yes
Yes
1
2
3
4
5
Remove the fiber
fault
Modfify ID of SCC
Replace SCC
board
Replace the board
Remove the power
supply fault
No Is fault removed?
EndContact Huawei for
help
NoGo to proper step
Yes
Transmission NM
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
61/75
ECC Faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
62/75
Internal Use 62
Station A
Station B
StationC
D
OTM-OTM
OADM
W
E
E
W
EW
E
WOTM-OTM
OTM-OTM
Station DStation E
Station F
Station G
OADM
OADM
OADM
E
W
E
W
W
E
central station
After the service is activated, when
some stations are logged in, ECC
intermits.
When making an orderwire call,
there are a lot of noises, and the
communication is interrupted
transiently every several seconds.
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
63/75
Internal Use 63
Orderwire Faults
Orderwire Faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
64/75
Internal Use 64
Causes Fault type
External causes Power failure
Fiber fault
Human factors Incorrect phone settings
Incorrect orderwire NNI connection
Incorrect OSC/OTC setting
Incorrect SCC setting
Equipment
faults
OSC failure or performance
deterioration
PMU failure or performance
deterioration
Methods:
Alarm and performance analysis
Configuration modification
Orderwire
communicationfailure
Orderwire Faults Handling
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
65/75
Internal Use 65
Orderwire faulthandling
Transmission NM
Is faultremoved?
EndContact Huawei
for help
NoGo to proper step
Yes
Is it external causes (powerfailure or fiber fault)
Is PMU faulty?
Is phone setting incorrect?
Is OSC/OTC configurationincorrect?
Is the type of SCC
incorrect?
Is OSC/OTC/SCC damaged?
Yes
No
Yes
No
Yes
No
Yes
Yes
Yes
1
2
3
4
5
6
Replace PMU
Modify the setting
Modify theconfiguration
Replace OSC/
OTC/SCC
Remove theexternal fault
No Replace SCC
Upgrade software
Hardware version
inconsistent
Software versioninconsistent
Is SCC configurationincorrect?
Modify the SCC
configuration
Yes
No
Yes
No7
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
66/75
Case of Orderwire Faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
67/75
Internal Use 67
WDM ring1
SDH ringPhone
line
RS-422
Serial cable
A1 A2 B1 B2 WDM ring2
Phone
line
RS-422
Serial cable
A1/A2 In one
Equipment room
B1/B2 In one
Equipment room
after performing configuration to enable
outgoing orderwire communication, orderwire
between two DWDM rings cannot be connected.
Fault Classification
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
68/75
Internal Use 68
Equipment Interconnection
Failure And other faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
69/75
Equipment Interconnection Failure
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
70/75
Internal Use 70
Equipment interconnection
failure handling
Transmisssion NM
Is faultcleared?
EndContact Huawei forhelp
No
Go to proper step
Yes
N
Is the connected equipment
faulty?
Is fiber connection incorrect?
Are the parameters of
interconnected optical interface
or fiber mode mismatched?
Is FEC protocol mismatched?
Are optical components
damaged?
Does board performancedeteriorate?
Yes
No
Yes
No
Yes
No
No
Yes
Yes
Yes
1
2
3
4
5
6
Re-connectthe fiber
Replace the
fiber
Replace OTU
Replace the
faulty board
Replace theboard
Remove the
fault
No
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
71/75
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
72/75
Other Faults
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
73/75
Internal Use 73
Hardware configuration
Board upgrade
Parameter setting
Meter test
Remote maintenanceFault type Causes
Parameter
setting.
Hardware configuration (optical amplifier
board and OTU) is unreasonable.
Configuration of VOA, configuration of DCM
and optical fibers, etc.
Parameter setting is incorrect
NM parameter setting is not matched with
hardware.
Meter test The meter is not grounded.
Testing optical fiber is bent, or fiber
connectors are dirty.
Meter setting is incorrect.
Testing method is incorrect.
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
74/75
-
8/11/2019 OptiX WDM System Troubleshooting ISSUE1.0
75/75