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NEC-MIC-0807506 Ver.2.1
PASOLI NK NEOPASOLI NK NEO/ c Maintenance
PASOLI NK NEOPASOLI NK NEO/ c Maintenance
NEC
Xian/GuiLin NEC
Aug. 2008
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NEC-MIC-0807506 Ver.2.1
Target Audience
The program is intended for staffs to operating andmaintaining NEC NEO&NEO/c Microwave Equipment
PrerequisitesHaving at least one year experience in installingand testing of RF equipment Being familiar with Windowsoperation system;Having the basic knowledge of telecommunications
Objectives
On completion of this program, the participants will be able to:Describe the structure of the NEC NEO, direct or carry ourRoutine maintenance and troubleshooting for NEC Pasolink MW
Course target
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Maintenance Test sets
Accessories preparation
--Digital meter3--Bit error meter4
--Screwdriver5
--T type hexagonal driver6
--Torque wrench7
--PC for LCT Terminal8
ANRITSUMN95DOptical Variableattenuator
2
ANRITSUMp1570ASDH analyzer1
ManufactureModel
number
Model typeNo
Note: - mean Customer can prepare the tool by themselves, Nospecial requesting about the model number & manufacture
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NEC-MIC-0807506 Ver.2.1
The problems existing during installation:
1, Prompt problem due to poor installation or setting mistakesThis problem will find out immediately and fix after installation.For instance: IF cable opening, circuit shorting; wrong CH setting
2, Potential problems due to poor installation or setting mistakesThis problem remains on your system and not easy be find out.For instance: poor antenna fix, poor grounding system; wrongE1 impedance setting.
Most of installation and manufacture problems will happen within one annualyear operation.After that system goes into normal operation period.
Maintenance Tasks
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NEC-MIC-0807506 Ver.2.1
Maintenance Equipment
482(W)x44(H)x190(D)mm 1+0
482(W)x44(H)x230(D)mm 1+1
482(W)x44(H)x240(D)mmIDU
SAME with NEO 239(W)x247(H)x68(D)mm237(W)x237(H)x101(D)mmODU
NEO /c (NEO PDH sample version)NEO
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NEC-MIC-0807506 Ver.2.1
1. Routine Maintenance:
Through routine activity to avoid links problems happen.
2. Troubleshooting:
When problem has happen, or equipment fault,Fix problem, Recover links service.
Two Maintenance Tasks in ordinary work
Maintenance Tasks
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NEC-MIC-0807506 Ver.2.1
1. Routine Maintenance
Meter reading
Reading the RSL metering test result and check the linkstatus.
Link performance monitoringCheck the link performance, 15min and 1 day historymonitoring data record can help to analysis the linkperformance.
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1. Routine Maintenance
Routine maintenance need use NMS by
software PNMSJ (remote checking) orPNMTJ (local checking).
Managed Di gi t al Radi oManaged Di gi t al Radi o
Net wor kNet wor k
Remote Client Access
adminadmin
demodemo
Filtered TrapsFiltered Traps
UpperUpperNMSNMS
Remote accessRemote access by Pby PNMSNMSJJ Local accessLocal access by Pby PNMNMTJTJ
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Routine Maintenance
Metering reading(PNMTJ>performance monitor>meter)
TX power checkingthe Specification
+/- 1dBm
RX level according
by LOSS design +/-3dBm
ODU power supplyfollow by IDU power
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Note: lower batter will affect your reading!
Routine Maintenance
Metering reading on ODU
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NEC-MIC-0807506 Ver.2.1
Routine Maintenance : LinkPerformance Monitor
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Function:To monitor the Link Performance.
Procedure:Click Performance Monitor---> Link PerformanceMonitor buttonin the NE-specific menu bar.
(PNMTJ>performancemonitor>link performance monitor)
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NEC-MIC-0807506 Ver.2.1
2. Trouble shooting
For the basic troubleshooting, following
method is needed to know by engineer.
Alarm status checking
Loop back
BER measurement
Troubleshooting Flow
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2. Trouble shooting
LED alarm situation
ODU Rx=? ODU Tx=?
Order wire test
DC power supply
Following items should pay attention
during troubleshooting
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Trouble shooting
-alarm checking
Alarm checking by NMS
Alarm checking by LED of IDU
How to check the alarm of one link?
Basic method is check the alarm first,the microwave equipment has alarmsystem to instruct
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Trouble shooting-alarm checking on PNMTJ
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NEC-MIC-0807506 Ver.2.1
Trouble shooting-Alarm checking by PNMSJ&PNMTJ
Alarm checking can use NMS by software
PNMSJ (remote checking) or PNMTJ (localchecking).
Managed Di gi t al Radi oManaged Di gi t al Radi o
Net wor kNet wor k
Remote Client Access
adminadmin
demodemo
Filtered TrapsFiltered Traps
UpperUpperNMSNMS
Remote accessRemote access by Pby PNMSNMSJJ Local accessLocal access by Pby PNMNMTJTJ
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Routine Maintenance-Alarm Checking by NMS
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NEC-MIC-0807506 Ver.2.1
Routine Maintenance-Alarm Checking by LCT
1. The normal status is in PNMSJ& PNMTJ system is all theboard is green.
2. The correlation block of the structure figure of mainwindow will change green into red when theequipment occur fault.
So you need log in PNMTJ to check Alarm:
(an example as following figure), then you can click on redblock, and check fault information description.
PC
(Start)
PNMSJ&PNMTJ
(START)
Alarmboard
(Click)
(Show)alarmstatus
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Routine Maintenance-ALARM Checking BY PNMTJ
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Trouble shooting-Alarm checking on PNMTJ
Path:
PNMTJ >EVENT LOG>CLI CK and Checking like upper status
* Detail Alarm inform checking by Event log interface
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NEC-MIC-0807506 Ver.2.1
NEO 1+0 &NEO/C IDU 1 + 0
Configuration
NEO IDU 1 + 1 Configuration
Trouble shooting-Alarm checking on LED
Alarm checkingon front of IDULED
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Routine Maintenance-Alarm checking by IDU LED
CTRL Module LED
IDU
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Routine Maintenance-Alarm checking by IDU LED
Modem Module LED
IDU
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NEC-MIC-0807506 Ver.2.1
Trouble shooting-loop back by PNMTJ
MAINTENANCE - PDHMAINTENANCE - SDH
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Function:To loop back the MUX signal at the IF
Procedure: (Maintenance mode must beON)Click IF Loop back buttoninMaintenance menu
Function:To conduct DADE adjustment
Procedure: (Maintenance mode must be ON)Click DADE Adjust buttonin Maintenancemenu
Trouble shooting-loop back by PNMTJ
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NEC-MIC-0807506 Ver.2.1
200894 NEC Corporation 2007 26
Function:To loop back the signal sent from selected
NE via the INTFCProcedure: (Maintenance mode must beON)Click Main Loopback-1(INTFC)buttonin Maintenance menu
ForPDH
ForSDH
Trouble shooting-loop back by PNMTJ
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NEC-MIC-0807506 Ver.2.1
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Function:To loop back the signal sent from the opposite NE at
selected NEProcedure: (Maintenance mode must be ON)Click Main Loopback-2buttonin Maintenancemenu
ForPDH
ForSDH
Trouble shooting-loop back by PNMTJ
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NEC-MIC-0807506 Ver.2.1
PDH- NEAR END / FAR END SDH- NEAR END / FAR END
Trouble shooting
-loop back by PNMTJ
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NEC-MIC-0807506 Ver.2.1
Trouble shooting
- BER measurement
BER TEST is used for the PDH bit
error test
Notes : For the one PDH channel bit error test , the oppositerelate channel need to be done loop back at same time!
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NEC-MIC-0807506 Ver.2.1
SDH analyzer is used in SDH channel
bit error Test
Trouble shooting
- BER measurement
Notes : For the one SDH channel connect with analyzer to make bit error test ,
the opposite relate SDH channel need to be done loop back at same time!
TX/RX
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Troubleshooting flow
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NEC-MIC-0807506 Ver.2.1
Troubleshooting Procedure
On NMS center:
1, Service quality down2, Check networks through NMS system3, Problem location: MW or BTS?4, For MW problem collect information remotely
with help of your local maint. staffs.5, Solve problem by your local staffs, or dispatchexpert to site with suitable spares.
On site:
1, Check by PNMT, or LCT2, Adjust antenna for antenna moving3, Check IF cable, DC connector for poor installation4, Replace IDU, ODU for hardware problem.
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Trouble shooting
-Fault isolation
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NEC-MIC-0807506 Ver.2.1
Fault equipment changing procedurewhen troubleshooting
Troubleshooting
ODU trouble shooting flow
IDU ODU trouble shooting flow
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NEC-MIC-0807506 Ver.2.1
Start
IF in put Alarm? IF cable length?
MOD DEM Alarm IDU
Change IF Cable
Change IF Cable
IF in put Alarm?
Replace ODUReplace IDU
APC1 APC2 Alarm?
Tx POW Alarm? Replace ODU
MW is OK!
Freq. setting ? Resetting freq.
Replace ODU
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NEC-MIC-0807506 Ver.2.1
Start
APC1 APC2 Alarm? Freq. setting ? Resetting freq.
Replace ODU
Rx level alarm? Opposite ODU OK? Opposite ODU fails
Freq. setting ?
Rx Level less 1V
Replace ODU
Antenna sys problem
Resetting freq.
MW OK
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Replace IDU
Replace IDU
Replace IDU
Replace IDU
Replace IDU and ODU
IF cable connector
Replace IDU
TX CPU ALM
Replace IDU
Replace IDU
Replace IDU
Replace IDU
MOD ALM
TX DPU ALM
TX CLK LOSS
MUX ALM
OPR ALM Grounding system or IDU,ODU
Input ALM IF Cable connector Correct connector
120, 75 setting Correct Imp setting
Replace IDU
Equipment OK
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NEC-MIC-0807506 Ver.2.1
Troubleshooting
-Fault replacement / ODU replacement
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Troubleshooting
-Fault replacement / ODU Replacement
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Troubleshooting
-Fault replacement / ODU Replacement
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Troubleshooting
-Fault replacement / Waterproof for ODU
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Troubleshooting
-Fault replacement / IDU replace
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Troubleshooting
-Fault replacement / IDU Replacement
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Troubleshooting
-Fault replacement / IDU Replace
To replace the MODEM module
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NEC-MIC-0807506 Ver.2.1
Troubleshooting
-Fault replacement / IDU Replace
To remove IDU
To Mount the IDU
Troubleshooting
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Troubleshooting
-Fault replacement /Fuse Replacement
T bl h i
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NEC-MIC-0807506 Ver.2.1
Troubleshooting
-Fault replacement
1, Prepare correct type of equipment
2, Turn off DC power before replace IDU and ODU
3, Check ODU: Tx high always working with Tx low
4, 7G,8G Paso+ ODU is point freq. unit. Its freq. has tosetting same with printed freq. on ODU
5, Normal DC supply Paso+: 40 60V; Paso is 20-70V
Important points for Unit replace-1
T bl h ti
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6, IDU ID setting should same on both side of one link
7, DEM maybe setting to ON for 7, 8G ODU
8, Check IF cable impedance: about 100M OHM for open,about 10K OHM with ODU.
9, Mark damage equipment, send it to NEC on time.
10,Check installation situation for frequent equipment
damage on same site.
Important points for Unit replace-2
Troubleshooting
-Fault replacement
h i
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NEC-MIC-0807506 Ver.2.1
Sebah019 link problem, BTS alarm,
Check Rx lower -70dBmCheck Opposite Rx level -70dBmTx out put OK
Problem on antenna system----antenna misallignment ,change the antenna allignment, the service was ok.
Note:
Long term Rx down on both site, problem onantenna system, propagation section.
Short term Rx down on both side problem relative to fading or poor IF cableConnection.
Trouble shooting-Examples 1
A: Rx
-70dBm
B: Rx
-70dBm
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NEC-MIC-0807506 Ver.2.1
Case1 Troubleshooting Summary
After alignment again the MW link wasok, the BTS signal was normal.
Result4.
Step by step to insulate the problem,and then concentrate the problem wasAntenna miss alignment ;
Measure3.
a. One side fault?
b. Water influence ?
c. ODU lightning strike ?d. Antenna ?
Analysis2.
BTS service down, MW link is off; twoside ODU alarm.
phenomena1.
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Trouble shooting
-Examples 2
Eajadabia link problem
Check Rx lower ***dBmCheck Opposite Rx level -34dBm
Problem on ODU!--------replace ODU with spares
Note:
One site Rx down, problem on ODU.
A: Rx***dBm
B: Rx
-34dBm
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Case2 Troubleshooting Summary
After change to new ODU (same bandwith same sub-band) , MW link was ok,the BTS signal was normal.
Result4.
Step by step to insulate the problem,
and then concentrate the problem wasODU problem ;
Measure3.
a. Configuration problem?
b. Water influence ?
c. A side IF cable normal ?d. ODU lightning strike ?
Analysis2.
BTS service down, MW link is off; the Aside ODU alarm ,IDU alarm.
phenomena1.
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Maintenance summary
1, poor operation situationTemperature over equipment specification, water damage,Lighting damage by poor grounding system, DC powersupply problem, new building affection etc.
2, poor installationpoor Antenna fix, poor IF cable connector assembly, E1 cableshort circuit or opening, IF connector short circuit etc.
3, Un suitable transportation
Maintenance activity include Routine maintenance andtroubleshooting. Alarm checking is very important
operation in maintenance, after checking Alarm, we cananalysis when kind of trouble system possible have.
For troubleshooting follow thing need careful beforeinstallation.
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Question &Answer 1 How to check the alarm?
check the IDU or check the PNMTJ.
2 How to trouble shooting the link?check the IDU indicator or check the PNMTJ alarm pannel.
3 How to check the link performance?remote connect PNMSJ or local connect the PNMTJ software to IDU, click themanus of performance monitor>link performance monitor> check the link
performance by PNMTJ software. The error data should be 0.
4 How to connect the link status by PNMTJ?local connect the PC to one of the IDU of one link , then start the PNMTJ software.
5 How to remote control IDU?check the IDU through network by the PNMSJ.
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Thank you!