O&M-PASO NEO-tian

7/28/2019 O&M-PASO NEO-tian

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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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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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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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NEC-MIC-0807506 Ver.2.1

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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NEC-MIC-0807506 Ver.2.1

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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NEC-MIC-0807506 Ver.2.1

Note: lower batter will affect your reading!

Routine Maintenance

Metering reading on ODU


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Routine Maintenance : LinkPerformance Monitor

11

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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NEC-MIC-0807506 Ver.2.1

Routine Maintenance-Alarm Checking by NMS


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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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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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NEC-MIC-0807506 Ver.2.1

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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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



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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



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NEC-MIC-0807506 Ver.2.1

200894 NEC Corporation 2007 27

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



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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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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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Fault equipment changing procedurewhen troubleshooting

Troubleshooting

ODU trouble shooting flow

IDU ODU trouble shooting flow


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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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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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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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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!

Documents

O&M-PASO NEO-tian