Upload
rohit00722
View
235
Download
0
Embed Size (px)
Citation preview
7/30/2019 Trouble Shooting Fault Analysis
1/38
OptiX BWS 1600G
System Troubleshooting
7/30/2019 Trouble Shooting Fault Analysis
2/38
Objectives
Upon completion of this coures,you will be able to:
Compare the different use of Common Methods ofFault Locating.
Illustrate Regular Operation for Troubleshooting.Describe the Basic Thoughts and Methods of FaultLocating.
Know the Fault Handling Flow.
Analyze and Eliminate the common faults.Improve the ability of eliminating faults through
case analysis
7/30/2019 Trouble Shooting Fault Analysis
3/38
References
Optix BWS 1600G Maintenance
Manual(Troubleshooting)
Optix Metro6100 Maintenance
Manual(Troubleshooting)
Optix Metro 6040 User Manual
7/30/2019 Trouble Shooting Fault Analysis
4/38
Contents
Chapter 1 Operations for troubleshooting
Chapter 2 Basic Thoughts and Methods of
Fault Locatiting
Chapter 3 Fault Handling Flow
Chapter 4 Fault classification and location
7/30/2019 Trouble Shooting Fault Analysis
5/38
Review Point
Left is defined as
west and right aseast in a chain
network.
The ring network takes
counter-clockwise
direction as the primary
ring direction.
WEST EAST
EAST WEST
WEST
WEST EAST
EAST
EAST
WEST
7/30/2019 Trouble Shooting Fault Analysis
6/38
Key Operation
Software Loopback (Use-T2000)
Cross Loopback (Trans & Receive)
Hardware Loopback (Use Physical Fiber)
Reset Board
Clean Optical Interface
Optical Power Test Replacement of Board
7/30/2019 Trouble Shooting Fault Analysis
7/38
Software Loopback: Outloop
* Loop a received signal directly backto its
corresponding output port(WDM orclient
side).
* It can be used to test the fiber line
andconnectors.
Outloop OTU
OUT Outloop
Client side WDM side
Client side WDM side
7/30/2019 Trouble Shooting Fault Analysis
8/38
Software Loopback: Inloop
OUT inloop
Inloop OTU
WDM side
WDM side
Client side
Client side
Inloop at client side of OTU
Inloop at WDM side of OTU
7/30/2019 Trouble Shooting Fault Analysis
9/38
Cross Loopback
Note: LWM and LWX boards support cross loopback.Client side OTU WDM side
A 2 c
1 2
1
B D
Optical
Receiving
module
Optical
Receivingmodule
Optical
Transmitting
module
Optical
Transmitting
module
Broadcast receiving signal at client sideTo optical transmitting modules at both
Client side and WDM side
Broadcast receiving at WDM side to optical
Transmitting modules at both WDM side
And client side.
7/30/2019 Trouble Shooting Fault Analysis
10/38
Hardware Loopback
Client side
Transmitting module
Hardware
Software loopback
Loopback
Receiving module
Rx
Tx
WDM side
IN
OUT
Rx
Tx
IN
OUT
Fixed
Attenuation
7/30/2019 Trouble Shooting Fault Analysis
11/38
Reset Board
Reset SCC Board
Reset by NM.
Reset by Pressing the reset button on SCCboard.
Reset by removing and inserting SCC board
Reset Other Boards
Reset by NM
Reset by unplugging/plugging the board.
7/30/2019 Trouble Shooting Fault Analysis
12/38
Clean Optical Interface
Make sure the fiber to be cleaned is disconnected
with any active component.
Hold the fiber connector,clean the surface with lens
tissue, Do this once or twice more using differentparts of the tissue.
After the surface dries,use special compressed gas
to blow the surface
Check the connector surface
7/30/2019 Trouble Shooting Fault Analysis
13/38
Optical Power Test
OTM OTM
IN IN IN ININININ IN
ODF ODF
OTU OTUMUX/
DEMUX
OA FIUMUX/
DEMUXOAFIU
Optical power
meter
Optical power
meter
OUT
IN
Fiber
jumperTesting
port
Optical board
Testing
port
Optical board
Fiber
jumper
Optical power
meter
MON
Optical
Power test
7/30/2019 Trouble Shooting Fault Analysis
14/38
Replacement of Board
Before replacement
During replacement
After replacement
Check board version
(Especially for OUT)
Detailed information
Can be obtained from
Bar code.
Detailed information
Can be obtained from
Bar code.
Wear an ESD wrist
strap. Correctly
swap the board.
Avoid short-circuit of
the board.
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.
Prevent eyes from being hurt
by the laser.
Check whether the
board is working
normally, and upload
configuration 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
7/30/2019 Trouble Shooting Fault Analysis
15/38
Classification of Board Replacement
Classification of
boardsBoard name Remarks
Optical transponder
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 amplifierunit
OA a. Prevent the over-high input optical power from damaging optical components.b. Keep the operating band of the new optical amplifier unitidentical with that of original one.
c. Do not stare into the output optical interface, since the output optical
power of HBA, PRA/RPC/RPL is very high.
Optical multiplexing/
Demultiplexing &
Add/drop multiplexingunit
MUX /
DEMUX
a. Prevent the over-high input optical power from damaging optical components.
b. Keep the operating band of the new optical amplifier unit identical with that
of original one.c. Keep the type of the substitute board identical with that of original one.
Optical supervisory
Channel unit
SC1, SC2
TC1, TC2a. The type of the substitute board identical with that of original one and whether
it supports LHP system application.
b. The input optical power
7/30/2019 Trouble Shooting Fault Analysis
16/38
Contents
Chapter 1 Operations for troubleshooting
Chapter 2 Basic Thoughts and Methods of
Fault Locatiting
Chapter 3 Fault Handling Flow
Chapter 4 Fault classification and location
7/30/2019 Trouble Shooting Fault Analysis
17/38
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
7/30/2019 Trouble Shooting Fault Analysis
18/38
Basic Principles of Fault Locating
Note: The key step is to locate the fault to a certain
cable or a station or an exact board accurately.
External First, then Internal
High-severity Alarms First,
then Low-severity Alarms
Network First, then NE
Why Trouble?
7/30/2019 Trouble Shooting Fault Analysis
19/38
Common Methods of Fault Locating
Alarm and performance analysis
Test with instruments
Replacement
Loopback
Handling based
On experience
7/30/2019 Trouble Shooting Fault Analysis
20/38
Alarm and performance analysis
Querying current or history alarms and performance data
through transmission network management (NM) system.
Querying current running status of the equipment through
Cabinet & board indicators
Features
From NMS
ComprehensiveThe fault information about the equipment in the
whole network can be obtained.
AccurateCurrent 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.
From cabinet and board
Easy for operation on site
Faulty information is not detailed
How to obtain
alarms and
performance
7/30/2019 Trouble Shooting Fault Analysis
21/38
7/30/2019 Trouble Shooting Fault Analysis
22/38
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 amplifierboard.
2. Compare with original data.
1.Compare with performance data from
NMS.
2.Avoid service interruption. MON port is
Recommended for measurement
7/30/2019 Trouble Shooting Fault Analysis
23/38
Replacement
SDH LWF
A
R_LOS
B
LWF reports R_LOS
Features
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.
7/30/2019 Trouble Shooting Fault Analysis
24/38
Loopback
Tx1
Tx2
Txn
Rx1
Rx2
Rxn
Rx1
Rx2
Rxn
Tx1
Tx2
Txn
SDH
Analyzer
Attenuator
Attenuator
OM/OA OA/OD
OA/OD
OM/OA
Attenuator
s
Loopback by segments
or section
R_LOS
7/30/2019 Trouble Shooting Fault Analysis
25/38
Handling based on experience
Reset board
Plugging/unplugging 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.
7/30/2019 Trouble Shooting Fault Analysis
26/38
Troubleshooting Procedure
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 board Common methodReplacement, meter
test, and loopback
Loopback
Replacement
7/30/2019 Trouble Shooting Fault Analysis
27/38
Contents
Chapter 1 Operations for troubleshooting
Chapter 2 Basic Thoughts and Methods of
Fault Locatiting Chapter 3 Fault Handling Flow
Chapter 4 Fault classification and location
7/30/2019 Trouble Shooting Fault Analysis
28/38
Fault Handling Flow
General fault handling flow
Emergency handling flow
Collection and recording
information
Technical support
G l F l H dli
7/30/2019 Trouble Shooting Fault Analysis
29/38
General Fault Handling
FlowStart
Record fault symptom
External
Causes
Other handling
process
Analyze & locate fault
Fault
removed?
Feed back to Huawei
Work out solutions together
Try to solve
Service
recovery?
Running & observe
Fault
removed?
Yes
Yes
Yes
No
No
No
Fault
removed?
Summary and
Fitt out report
END
Yes
No
Yes
7/30/2019 Trouble Shooting Fault Analysis
30/38
Emergency Handling flowHandle service
interruption
Is standby channel
available?
Is loopback set?
Is there any abnormal
alarms?
Is optical powerabnormal?
Are there bit error
Do alarms below occur;
R_LOS/MUT_LOS
IN_PWR_LOW /
IN_PWR_HIGH
Switch the service to
the standby channel
Cancel loopback
Reset the board;
Remove/insert the board;
Replace the board
Optical powertroubleshooting
Bit error
troubleshooting
Contact Huawei for
help
Is the fault
Removed?
End
Transmission NM
2
1
4
5
3
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO YES
For service interruption
Caused by externalfactors
Such as power failure,
fiber Cut, improper operation
or software
And hardware faults
7/30/2019 Trouble Shooting Fault Analysis
31/38
Common Alarms and Causes
Board type
Optical
Amplifier Unit
MUT_LOS
Alarm Handling
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 faulty. The board needs to be replaced.
Optical
Multiplexer/
DemultiplexerUnit
MUT_LOSPower 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 faulty. 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_HIGHPower 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 willalso 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 faulty. If the service is affected, replace the board in time.
If not, replace it in a proper time.
7/30/2019 Trouble Shooting Fault Analysis
32/38
Technical Support
Vuppulamritha Magnatic Components Ltd.
Address: Plot No.3A, Road No. 2, Shakti Sai Nagar, IDA Mallapur,
R.R. Distt., Hyderabad, Andhra PradeshPostal Code: 500076
Website:http://www.vmcindia.com
Customer service mailbox: [email protected]
http://www.vmcindia.com/http://www.vmcindia.com/7/30/2019 Trouble Shooting Fault Analysis
33/38
Contents
Chapter 1 Operations for troubleshooting
Chapter 2 Basic Thoughts and Methods of
Fault Locatiting
Chapter 3 Fault Handling Flow
Chapter 4 Fault classification and location
7/30/2019 Trouble Shooting Fault Analysis
34/38
Fault Classification
Optical Power Abnormity
Bit Errors
Transient Service Interruption
Service Interruption
ECC Faults
Orderwire Faults
Equipment Interconnection Failure
Other Faults
7/30/2019 Trouble Shooting Fault Analysis
35/38
FAULT CLASSIFICATION
Optical Power Abnormity
7/30/2019 Trouble Shooting Fault Analysis
36/38
Optical Power Abnormity
SDH
SDH
SDH
SDH
OTU
OTU
OTU
OTU
OTU
OTU
OTU
OTU
SDH
SDH
SDH
SDH
MUX
MUX
OSC
DMUX
DMUXOA
OA
OA
OA
OSC
OTM OTM
Optical power checking point
Pay attenuation to
optical power of
OTU and OA
Category
Optical power
is too low
The input optical power is below the
Sensitivity.
Effect
Decrease of the input optical power
Affects optical signal-to-noise ratio.
The input optical power is below ALS
threshold.
Bit errors areGenerated.
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.
7/30/2019 Trouble Shooting Fault Analysis
37/38
Optical Power Abnormity
Fault type
External causes
Causes
Equipment faults
Fiber attenuation is too high (due to fiber bending, squeezing, binding
and dirty Connector).
Incorrect fiber connection
Line performance deterioration.
OUT board failure or performance deterioration.
Optical amplifying board failure or performance deterioration.
Alarm and performance analysisSection-by-section loopback
Replacement
Meter test
P d f H dli O i l P F l
7/30/2019 Trouble Shooting Fault Analysis
38/38
Is input optical power ofOBU abnormal ?
Procedure of Handling Optical Power Fault
StartIs input optical power of
OTU at Rx port abnormal ?
Adjust fibers between:- OPU/OAU
& DMUX; DMUX & OTU
11
33
2
13
12
11
10
9
88
77
66
5
44
Is output optical power of
OTU at OUT port abnormal ?
Is output optical power of
OBU abnormal ?
Is input optical power of FIU at
RC port abnormal ?
Is output optical power of FIU at
OUT port abnormal ?
Is input optical power of FIU at
IN port abnormal ?
Is output optical power of FIU at
TC port abnormal ?
Is input optical power of
OPU/OAU abnormal ?
Is output optical power ofOPU/OAU abnormal ?
Is input optical power of
OTU at IN port abnormal ?
Is output optical power of
OTU at Tx port abnormal ?
Is the received optical power of
SDH equipment abnormal ?
Remove the fault
At client side
Replace OUT
Adjust VOA placedBefore OBU
Replace OBU
Remove the
Fiber fault
Replace FIU
Remove the
Fiber fault
Replace FIU
Adjust VOA placed
Before OPU/OAU
Replace OPU/OAU
Contact
Replace OTU
Adjust fibers between OUT &
SDH equipmentIs fault
removed
End
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
NONO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YESYES
YES
Transmitting
end
Receivingend
Transmission
NM