Page2Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Objectives
Upon completion of this course, you will be able to:
Understand the normal flow and methods to deal with
trouble
Master how to orientate Hardware system’s and User
system’s trouble
Master the universal trouble shooting methods
Page3Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Normal Flow & Method
2. User System & Hardware System’s Trouble
3. The Common Trouble Shooting Orientation Method
Page4Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Basic Requirement For Operator Familiar with system and network
Master the instrument and meter equipment
Familiar with operation
Professional technique and skill
Page5Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal Flow Collecting message
Obtain the original information as soon as possible
Judging trouble
Make sure the range and category
Finding out the trouble point
Find out the reason of the trouble
Eliminating the trouble
Eliminate the trouble and repair system according to the
suitable processing
Page6Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Analyzing original information
Alarm messages
Indicating light status
Dialing test
Instrument and meter equipment
Traffic statistics
Page7Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Dynamic & Signaling tracing
Test / Loop
Contrast / Interchange
Switchover / Reset
Contact with Huawei Support Technology
Page8Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method Analyzing original information
Example 1:
U (User): My phone has some problem, please help me to check it.
E (Engineer): When did you face this problem? Calling out or calling in.
U: Oh, calling in. I could hear ring-back tone when I used mobile to call my
phone set. But the phone didn’t ringing. What’s the problem?
E: Ok, Did you try to pick up the phone when you make a call? Could you
hear anything?
U: Yes, I tried it before. I just heard “Du…Du…”, and couldn’t talk with
each other.
E: You may have “Call forwarding unconditional” service. Could you dial
#57# to cancel it ?
Solve the problem
Page9Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Alarm messages
Example 2:We can observe the alarm messages by
Alarm Box and Alarm Station.
Page10Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Indicating light status Example 3:DTF card alarm indicating lights
If “LOS1” turn on, it means the first E1 Loss of
Signal. It may be disconnect or one-way audio.
If “SLP2” turn on, it means the second E1 slip frame.
It may be low clock synchronization performance or
high transmission attenuation.
Suggestion:
Operator should pay attention to accumulate
indicator’s status. It will help to improve the ability
of fleetly solving problem.DTF
CAS
LLB1
RLB1
RRA1
RMA1
SLP1
LOS1
RCL1
RUN
LLB2
RLB2
RRA2
RMA2
SLP2
LOS2
RCL2
DSP
Page11Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method Dialing test
Example 4: It is a new SS7 trunk group between Office A and opposite office. The trunk circuits and links status are normal. But they can’t use new trunk to make inter-office call.
Using a local office user to dial the opposite office number and tracing this user, observing the result is “No route available”. And don’t send “IAM” to opposite office.
Orientating: The route selection data has some problem and the system can’t choose suitable circuit.
Hint: Dialing test is used popular. It’s usually used with dynamic tracing.
Page12Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Instrument and meter equipment
Example 5: Most user’s CLIP service are abnormal in a certain
frame.
To judge the influence for CLIP of PWX card. Using oscillograph to
analyzing output ringing current wave shape. It’s contain many
“harmonic voltage”. First judging burr interference “FSK” sending
and make CLIP abnormal.
Suggestion:
If condition permission, can choose instrument and meter
equipment for trouble analysis. The key point is the correct using
for instrument.
Page13Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Traffic statistics Example 6: The office A create TG Incoming Office statistics. It cont
ains “Lost Calls Of Int Congest Times” 10 times in 500 call attempts an hour.
It has several reasons for “Lost Calls Of Int Congest Times ” . Creating the Fail reason traffic in total office traffic task, The “No Ipath times” and “No Available Circuit Times” amounts are the same.
Which module is congesting? To tracing SS7 link and observing the SEC message, the operator finds the problem in X module.
Check the iDT trunk circuit between X module and Central module, they find that some PCM system are self-looped.
Page14Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Dynamic & Signaling tracing Example 7: Office A connect to Tandem X. There are some CGC me
ssage between them. It has the influence for call completion rate. The link and circuits status are normal. Data setting is correct. The result of link tracing as below:
Tandem IAI IAI…. CLF CLF……
Local IAI IAI… (total:22 IAI) CGC RLG CGC RLG…… There are 22 IAI messages which contents are the same. The reason is L
ocal office A and Tandem setting the same prefix and make cyclic between each other.
Page15Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method
Test / Loop Example 8: Local office A connects to office B. It appears many E1 s
lip alarms that has serious influence between them. The Network structure of office B as bellow:
We can choose point ① 、②、③、④ for loop testing. According to compare with the result, we can orientate the fault which is belong to switch system of transmission system.
This method is used widely for transmission fault.
OFFICE AC&C08
DDF DDFOFFICE B
11 22 33 44
Transmission Transmission
Page16Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Normal method Contrast / Interchange
Example 9: When make the test for rise digits in office X, some incoming call are rejected by system. The system send SST and the data setting is correct. The network structure as below:
According to dialing test: C can connect to B, but can’t connect to A. A & B call forwarding unconditional to D.
Compare with SS7 signaling, the “Redirected call indicator ” in IAI is 1 when C call A, since C call B is 0.
Change soft parameter. The system no need judge “Redirected call indicator ”, and solve this problem.
TandemTandem
USER A USER B USER C USER D
CC08CC08OFFICE XOFFICE X
TUPTUP
Page17Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Questions
How many kinds of method we have learned for
trouble shooting?
Which kind of method did you use before?
Page18Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Normal Flow & Method
2. User System & Hardware System’s Trouble
3. The Common Trouble Shooting Orientation Method
Page19Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Category of Hardware System Trouble Central Module
……CPMCPM
CCMCCM
CNETCNET
SPMSPM
SRMSRM
LIMLIM
LIMLIM
LIM-MHILIM-MHI
AAMMPP
CCDDPP
BBCCPP
FFSSNN
BBAACC
FFSSNN
……
SSPPCC
BBCCCC
CCPPCC
……
SSPPDD
SSRRCC
……
QQSSII
MMHHII
MMHHII
……
QQSSII
OOBBCC
EETT1166
……SSTTUU
QQSSII
OOBBCC
EETT1166
SSTTUU
……CCNNUU
BBDDRR
SSNNUU
SSNNUU
NNCCCC
SSNNUU
……
……
BAMBAMLANSWITCHLANSWITCH
TCP/IPTCP/IP TCP/IPTCP/IP
HDLCHDLC
HDLCHDLC
HDLCHDLC
HDLCHDLC
HDLCHDLC
393M393M
393M393M
393M393M
MHIHW-2M
MHIHW-8M
SM40.96M40.96M
E1E1 OPPOSITE OPPOSITE OFFICE OFFICE
The Fault of CardThe Fault of CardAnd internal connectionAnd internal connection
The fault of TCP/IP The fault of TCP/IP connectionconnection
HDLCHDLC
The fault of CCMHW The fault of CCMHW connectionconnection
The fault of MHIHWThe fault of MHIHW connectionconnectionThe fault of OFL The fault of OFL connectionconnection
Page20Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Category of Hardware System Trouble Central Module
The fault of Card
The fault of Internal connection
The fault of TCP/IP connection
The fault of CCMHW connection
The fault of MHIHW connection
The fault of OFL connection
The fault of Clock Line connection
The fault of DIP switch
The different version of hardware and software
Page21Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Category of Hardware System Trouble Switching Module
The fault of card
The fault of internal connection (NOD, HW)
The fault of OFL connection between Central Module
The fault of switches setting
Page22Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case
Example 1:
Phenomenon Description: The 4# LIM can’t load in 128M.
Cause Analysis:
First to check the DIP switch (00000100), since the Frame ID
must keep the same as DIP switch.
Handling Process:
The 4# LIM DIP switch setting is incorrect when the operator
check it in the office. The 4# LIM begin to load after change
DIP switch.
Page23Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case
Example 2:
Phenomenon Description: The SPM version can’t report after
loading.
Cause Analysis:
The data and program are loaded in SPC by TCP/IP. The SPC
communicate with other cards though CCMHW. If CCMHW setting is
incorrect, the SPC can’t communicate with other card and can’t
report the version.
Handling Process:
The SPC and BCC CCMHW should be 16,17,18, but the data setting
are 17,18,16. The SPM version can report after changing data setting.
Page24Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Common reason and handling procedure in User System Trouble Typical case analysis and discussing
The common trouble phenomenon in User System
The common reason for User system trouble
Page25Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case analysis
Example 1: no feedback
Phenomenon Description: The user can’t hear dial tone
after hook off. And the “work indicator” on telephone
turn off.
指 示 灯不 亮Indicator
Turn off
Page26Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case analysis Cause Analysis:
The external user line is short circuit or break.
The port which provided by ASL card is fault.
The external user line or analogue circuit is broken.
swinging cross.
The user’s phone set is broken
Suggestion and summary: The most trouble occur in
external user line or ASL card fault. It is necessary to test
external user line and ASL card regularly for preventing
trouble.
µ ½µ ×Ê ÇÊ ²Ã Ô Ò òÄ Ø£ ¿
What’s the
reason?
Page27Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case analysis
Example 2: CLIP service is abnormal
Phenomenon Description:
The phone set which apply the CLIP service can’t display
the caller number as called 。 The caller number display is fault. For example : the
number uncompleted, loss number or number error.
Why caller number disappeared?
Page28Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case analysis
Case analysis:
“can’t display the caller number” analysis:
– Check the FSK signal starting or not
– Check ASL card port is fault or not
– Check user’s phone set is fault or not
– Check user’s supplementary contains CLIP or not
– Check BNET(SM) or SRC(SPM) is fault or not
Page29Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case analysis
Case analysis:
“the caller number error” analysis:
– Check external user line
– Check ASL card port is fault or not
– Check BNET(SM) or SRC(SPM) is fault or not
– Check clock signal is normal or not
– Contact with “Huawei Technology Support”
Page30Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing Example for discussing 1: Ringing abnormal
Phenomenon Description :
No ringing. When make a call, caller can hear ring back tone, but
called don’t ringing. They can make conversation if called hook off.
Self-ringing. The phone will ringing itself even there isn’t incoming
call. When the called pick up, find is no incoming call here. The
ringing mode could be normal, long and so on.
Can’t cut off the ringing. Caller hear ring back tone, called ringing
then called off-hook. The called keep ringing and they can’t make
conversation.
What’s the possible reason?
Page31Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
No Ringing Analysis
No. Reason Remark
1 PWX is fault. No ringing
current.
There are no ringing current in User
Frame. It’s usually whole frame user
no ringing.
2 The supplementary
service is used
unsuitable.
The called set “CFU” and doesn't
cancel in time. It brings on all of the
call transfer to other user.
3 The circuit for ringing is
fault.
The corresponding user can’t
ringing.
Page32Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Self-ringing Analysis
No. Reason Remark
1 The user ling in ASL is fault.
Ring relay start-up
unconventionally or can’t
release after startup.
The user will be self-ringing or
ringing for long time.
2 The power supply is unstable.
It contains harmonic wave.
It makes ASL ring relay start-up
error and the user self-ringing.
3 The software running
procedure is abnormal.
It makes ASL ring relay start-up
abnormal and the user self-
ringing.
Page33Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Can’t cut off the ringing Analysis
Reason: The loop resistance is larger than switching
system monitor range.
Criterion: The loop resistance in free status ≤1800Ω; The loop resistance in
off-hook status≤300Ω. If switching system can’t detect the off-
hook, the called party will be considered free and the system will
send ringing current continually.
Summary: This kind of trouble occurs in village almost. It can solved by
change external user line or augment external user line’s core
area. And can use the better remote feeding ASL card to solve
this problem also.
Page34Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
Example for discussing 2: The half of frame or whole
frame users are fault
Phenomenon Description :
The phone set is no feedback, and can’t call in
No dial tone
Noise is great in conversation
What’s the possible reason?
Page35Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The possible reason-1
No
.
Reason Remark
1 The mother
board fuse is
burned
If fuse F1,F2 are burned, it will no feedback in whole
frame.
2 The mother
board is fault
Can’t call in and the noise is heavy in conversation.
3 DRV card is
fault
The DRV can used for receive DTMF, transfer user
line signal and drive HW signal. It usually used for a
pair. If one is broken and another card can’t start-up
help function, the half or whole frame’s users will
can’t hear dial tone, can’t call in or can’t work
normal.
Page36Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The possible reason-2
No
.
Reason Remark
4 NOD card is
fault
NOD likes communication bridge between MPU and
other cards. If NOD is broken, the whole frame user
can’t hear dial tone and can’t call in. If half of NOD is
broken, the call loss will be higher in user frame.
5 HW connection There are 2 HWs in each user frame. If one of them is broken, since help function can’t start-up, It occurs no dial tone, heavy noise and one-way audio in half of frame. It will affect whole frame if serious.
6 NOD connection If NOD line disconnect, it will bring on calling loss,
increasing no dial tone times and so on.
Page37Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The summary of user system phenomenon-1Range Category Phenomenon
Single user No feedback No dial tone
Ringing abnormal No ringing, self-ringing, can’t cut off ringing
Call in abnormal Can’t call in, can’t conversation, just ring one
time
Call out abnormal No dial tone, can’t cut off dial tone, hear busy
tone when pick up the phone
Connect
abnormal
Intra-module, Inter-module, Inter-office connect
abnormal
Conversation
abnormal
Noise is loud, the voice is small or loud, cross-
talking
CLIP abnormal No display, display error, display incomplete
Different
range user
Half frame of
whole frame
No feedback, can’t call in, no dial tone, heavy
noise, CLIP service abnormal and so on.
Page38Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The summary of user system phenomenon-2Range Category Phenomenon
Different
range
user
Whole office
congestion
All of the trunks disconnect, the system can’t
process any incoming and outgoing call. Or all of
the modules can’t call each other.
Inter-module
congestion
The user in SM, RSM, SPM can’t make
conversation between other modules.
Intra-module
congestion
The user in SM, RSM, SPM can’t make
conversation in the same module.
Intra-module
connection abnormal
one-way audio, can’t make conversation, disconnect when make conversation.
Inter-module or inter-
office connection
abnormal
Connection cost long time, one-way audio, can’t
make conversation, disconnect when make
conversation.
Page39Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The summary of user system trouble reason-1
Categor
y
Reason Remark
External
user line
disconnect/
short circuit
No feedback, no ringing, can’t call in, no dial tone
Grounding Loud noise, dial wrong number, ringing abnormal
Swinging
cross
No feedback, no ringing, self-ringing, no dial tone, can’t cut
off dial tone, display caller number error, the voice is small
Hardware ASL card fault No feedback, ringing abnormal, noise in conversation, the
voice is small, display caller number abnormal
DRV card
fault
No dial tone, can’t cut off dial tone, hear busy tone when
pick up the phone, usually affect a half of frame
PWX card
fault
No ringing, loud noise, display caller number abnormal,
usually affect a half of frame
NOD card
fault
No dial tone, can’t call in, usually affect a half of frame or
whole frame
Page40Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The summary of user system trouble reason-2
Categor
y
Reason Remark
Hardware SIG card fault No dial tone, usually affect one module
BNET card fault Intra-module connection abnormal, If clock phase
abnormal, it will appear noise in conversation,
disconnect when surf in network, display caller
number abnormal
HW line fault No dial tone, no ring back tone, one-way audio
NOD line fault No dial tone, can’t call in, usually affect a half of frame
Clock line fault noise in conversation, disconnect when surf in network
or in conversation, usually affect a half or whole frame
Other
reasons
Didn’t define user
data
No dial tone, can’t call in
Phone set fault No feedback, dial wrong number, ringing abnormal, noise in conversation, the voice is small, one-way audio
CIC no matching Outgoing call one-way audio,
Page41Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Summary
What did we learn in this chapter?
We have described hardware system and user system
trouble shooting in detail.
We have learned the trouble phenomenon, cause
analysis and handling process in hardware system and
user system.
Page42Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Normal Flow & Method
2. User System & Hardware System’s Trouble
3. The Common Trouble Shooting Orientation
Method
Page43Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
The Common Trouble Shooting Method The category of common trouble
Trunk/Link system common trouble
Charging/Bill management common trouble
Page44Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Trunk/Link system
Trunk/Link system data setting ADD CALLSRC
SET OFI (ADD OFI)
ADD N7DSP
ADD N7LKS
ADD N7RT
ADD SPMN7LNK
ADD OFC
ADD SRT
ADD RT ADD N7TG
ADD SPME1
ADD RTANA
ADD CNACLD
ADD CPCCFG
ADD SPMN7TKC
Pay attention:Pay attention:OPCOPCDPCDPCCICCICSLCSLC
TKC selection mode…TKC selection mode…
Page45Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
Case 1: No.7 link status abnormal
Trouble phenomenon:
Disconnect. Viz. the link can’t locate.
The link is unsteady. Namely the link always Initial
alignment and can’t transfer MSU.
The link interdiction, viz. remote processor outage.
The link is congestion. Namely the link works overload.
What’s possible reason?
Page46Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
The possible reason:
Transmission fault
STP fault
ET16/STU/DTF card is fault
Remote processor outage
Data setting incorrect (DPC/SLC/Link selection code)
Page47Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
Case 2: SS7 Trunk circuit status abnormal
Circuit status Remark
Fault If trunk circuits are not blocked when DPC unreachable
or PCM system fault, the trunk circuit status is fault.
Available blocked That indicates blocked opposite circuits already. It can
make outgoing call but can’t accept incoming call in
these status.
Unavailable blocked That indicates blocked local circuits already. It can
accept incoming call but can’t make outgoing call in
these status.
Unknown When office sends RSC/GRS message for this circuit
and doesn’t receive RLC, it will change to this status.
Uninstall That indicates didn’t configure trunk data yet. What’s possible reason?
Page48Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
The possible reason-1:
No. Reason Remark
1 Transmission
disconnect/error code
Circuit status “fault”
2 ET16, STU, DTF card
fault
3 Data configuration
incorrect or didn’t do
it
If didn’t configure trunk data, the circuit
status is “uninstall”. If didn’t configure DPC
or make mistake, the status is “fault”.
4 CPU overload and
start-up congestion
control
“Available block”
Page49Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
No
.
Reason Remark
5 BLOCK
6 CIC no matching “Unknown”
7 Link fault If DPC unreachable, the circuit status is
“fault”. If link congests or has high error
rate, the circuit status is “unknown”.
8 Local side hardware
fault
“Unavailable block”
The possible reason-2:
Page50Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
Case 3: The SS7 signal cooperation abnormal
Trouble phenomenon:
The SS7 signal cooperation abnormal usually means
inter-office connection abnormal. Like can’t make
conversation.
The caller number send abnormal. The incoming office
can’t obtain caller number or can’t obtain the real caller
number.
What’s possible reason?
Page51Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
The possible reason-1:
CIC no matching
The corresponding data for caller number is incorrect
Like “can request caller number”, “request caller
number”, “connect without or with invalid caller
number”, “default number”, “CLI provision mode”.
The call barring data is incorrect
The barring group number, the caller discrimination
number and so on.
Page52Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Typical trouble case discussing
The possible reason-2:
The supplementary signaling setting unsuitable
Like “send caller number”, “translate caller number”,
“send original called” setting unsuitable, then can’t
carry out some supplementary, such as CLIP, CLIR, call
forward and so on.
The soft parameter setting unsuitable
Page53Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis
Example 1: When user in Fix Network Office A call
mobile user, the caller number can’t carry area code.
The trouble phenomenon:
The network structure is as below. When user who is in
Fix Network call mobile user, the caller number need
carry area code in gateway office. All of users are carry
area code normal, except in office A.Office AOffice A
MobileMobile OfficeOffice
Office BOffice B
A,CA,C
USER AUSER A
USER BUSER B
USER CUSER C
B,CB,C0755B,C0755B,C
A,CA,C
Gateway OfficeGateway Office
Page54Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis Handling Process:
Using signaling tracing in gateway office, compare with A->C IAI and B->C IAI message. The “Nature of address indicator” is “00”(Local number) in B->C IAI message. And the “Nature of address indicator” is “10”(National significant number) in A->C IAI message.
Let office A change parameter “Nature of address indicator” to “00”, the caller number turn to normal.
Cause analysis: The parameter “Nature of address indicator” in signal which is sent by of
fice A is incorrect. Although the caller number doesn’t carry area code, the “Nature of address indicator” is “10”(National significant number). The gateway office considers the toll call and no need append area code.
Page55Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Charging/Bill management system Charging/Bill management system
Charging operation
Charging analysis
Caller Caller CalledCalled
ADD/MOD STADD/MOD ST ADD/MOD CNACLDADD/MOD CNACLD
ADD CHGIDXADD CHGIDXADD CHGANAADD CHGANAMOD CHGMODEMOD CHGMODE
DETAIL
METER
BAMBAM
RST BILPOLRST BILPOL
STR BILIFSTR BILIFMPU/SPCMPU/SPC
Page56Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis Example 1:
Phenomenon: When use ISP mode to carry out “simultaneous ringing”, the user B regist
ers “simultaneous ringing” to user C. If the user A who comes from opposite office call user B through incoming TG, system charge incoming TG. B and C ring at same time. If B picks up the phone, system generate one incoming TG ticket for A-B. If C picks up the phone to make conversation, there isn’t incoming TG ticket in system. It must generate incoming TG ticket for A-B, ether B picks up or C picks up.
Office COffice C
Office AOffice A
USER AUSER A
USER CUSER CA,BA,B
C&C08C&C08
USER BUSER B
A,BA,B
A,CA,C
Page57Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis
Example 1: Cause analysis:
It must generate incoming TG ticket for A-B, ether B picks
up or C picks up in ISP mode for “simultaneous ringing”.
Pay attention: If C pick up the phone, according to
incoming TG charging source code and the charging
selection code in prefix for virtual PBX indicating number,
system analyze charging case. It may be that the charging
data for prefix of virtual PBX indicating number is incorrect.
Page58Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis Example 1:
Handling Process:
When check charging data, the data setting is no charging
for corresponding incoming TG charging source code and
charging selection code of virtual PBX prefix. After change
the charging case to detail ticket, the charging is normal.
When A dial B, the B and C ring at same time. The system
generates incoming TG ticket successful for A-B, ether B
picks up or C picks up.
Page59Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis
Example 2:
Phenomenon:
The BAM couldn't fetch bill tickets from the exchange
since some day. There were no new *.bil generated
since that moment, and the total amount of bill tickets
in the SPM (there was only one SPM module in this
office, no SM) was more than 20,000.
Creating file in D:/bill/bill is fault
DETAIL
METER
BAMBAMSTR BILIFSTR BILIFMPU/SPCMPU/SPC
RST BILPOLRST BILPOL
Page60Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis
Example 2:
Cause Analysis:
After checking the billprint.txt, operator found the reason
as follows. >2005-11-29 10:45:53 Failed to open or create
ticket file (filename d:\bill\bill\2005112814.BIL) So the
problem was on the BAM. The following needs to be
checked.
1. Disk space on the BAM
2. Disk quality
3. If the attribute of folder bill has been set as read only
mode
Page61Copyright © 2006 Huawei Technologies Co., Ltd. All rights reserved.
Real case analysis
Example 2:
Handling Process:
After contacting the on-site engineer, he said that the
customer did something yesterday afternoon. Finally he
found that the folder Bill was set as read-only mode. The
problem was solved after changing folder Bill to writable
mode.
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Summary In these course, we have learned:
Normal flow and method for trouble shooting
The hardware and user system trouble phenomenon,
cause analysis and handling process.
Some common trouble shooting orientation method