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Training on Pasolink NEO/i

Technical Center Group

NEC India

Digital Microwave Radio –

Maintenance Pasolink NEO/i

GENERAL

This section provides instructions for maintenance of the

PASOLINK NEO/i used for 6-52 GHz SDH microwave radio system.

This section provides instructions on the precautions, test setup

and accessories, routine maintenance, corrective maintenance and

mounting of optional modules.

PRECAUTIONS

The following precautions must be carefully observed during maintenance.

The maintenance personnel should report arrival at and departure from a

station to the relevant station.

The following are dangers and warnings to the maintenance personnel.Warning:

1. The –48 V DC power is superimposed on the center conductor of the

coaxial cable between the IDU and the ODU. Connecting test equipment

directly to this terminal may damage it and touching the coaxial cable

core may cause electrical shock.

2. Persons performing maintenance must take necessary steps to avoid

Electro-static Discharge (ESD) which may damage the modules on the

IDU or cause error. Wear a conductive wrist strap connected to the

grounded (G) jack on the front of the equipment shelf. This will minimize

static build-up during maintenance.

3. Do not remove/connect the IF cable with the IDU power ON. Turn the IDU

power OFF before connecting/ disconnecting the IF cable, or equipment

may be damaged.

4. After turning ON the equipment, wait at least 1 minute before turning it

OFF again. Repeatedly turning the power ON and OFF within a short

interval may cause the IDU to fail.

5. Do not allow open or short circuit of ODU TX output with the TX power

on conditions. Perform the TX Mute control in the Maintenance mode or

turn the PWR switch off at the IDU before disconnecting cable or feeder

from the ODU TX output.

6. Contact NEC before program download on the LCT is performed.

Equipment may not function correctly with improper operation.

PRECAUTIONS

Caution :

1. In a system using the OPTICAL STM-1 INTFC, do not stare at the laser

beam or look at it directly with optical instruments. Otherwise, it may hurt

your eyes (Class 1 Laser Product).

2. The top surface of the IDU above MODEM is hot in operation.

3. When replacing the MODEM, STM-1 INTFC or DC-DC CONV (optional)

turn off the PWR switch and disconnect all cables connected to the module

which is to be replaced.

4. During maintenance, the IDU should be set to Maintenance "On" condition

by the local craft terminal (LCT).

5. If each setup item of "Equipment Setup" or "Provisioning" is changed

during in operation, traffic will be momentarily interrupted.

6. When the TX SW is activated, momentary traffic interruption may occurs

7. Before removing or installing the IDU/ODU, turn off the power switch on

the MODEM

PREVENTIVE MAINTENANCE

This section provides the routine maintenance procedures to ensure

the satisfactory operation of the equipment. During preventive

maintenance, carefully observe the precautions

Notes:

1. If an abnormal indication appears, check Alarm/ Status, performance

monitor and perform loopback test to distinguish sections of normal and

alarmed.

2. RX LEV varies depending on received RF signal level.

3. Power Supply voltage at ODU varies depending on IF cable length

between the IDU and ODU.

4. During total number of erroneous bits and total number of correctly

received bits are calculating, “Calculating” is displayed.

5. 1.0E-10 is indicted equal to 1 x 10-10.


Performance Monitoring




CORRECTIVE MAINTENANCE

Corrective maintenance done in the field is described in this chapter.

Corrective maintenance in the field covers fault isolation, module/unit replacement and

SW settings. The fault location procedures describe how to isolate module-level/unit-

level faults.

Faults can be classified into those that cause deterioration of the transmission quality

and those that interrupt the traffic due to a malfunction of the equipment. This chapter

explains the troubleshooting procedures for equipment faults and the corresponding

remedial methods.

The purpose of troubleshooting malfunctioning equipment is to restart the service by

locating the faulty part and replacing it with a spare.

The faults that cause deterioration in the transmission quality are primarily originated

by changes occurred in the state of propagation. Therefore, if a decline in the

transmission quality or similar fault takes place frequently, the link design will have to

be reviewed.

Alarm/Status

When an alarm event has occurred, At first, check alarm indication on the front of the

IDU. Continuously, connect the PC to the LCT jack on the IDU and check arm/status

indication, Meter Reading on the LCT.

(a) Check of the ALM LED Indications and LCT Indication A faulty part can be located

by checking the ALM LED indicators and LCT Alarm indications. For the explanation

of the ALM LED indication

(b) Meter Readings Based on the meter readings during periodical inspection with

LCT a faulty part can be located by checking if the reading values exceed the

permissible ranges.

(c) Loopback In the case of an abnormal BER measurement result among the

meter reading items, try to distinguish the faulty part.

The alarm and status of each module and ODU are displayed.


ODU

TX Power: Indicates the status of the transmitter in the ODU. When the transmission level is

decreased 3 dB or more from preset ATPC minimum level, “Alarm” is issued.

TX Input: Indicates the status of the ODU input signal from IDU. When the input signal from the

IDU is lost, “Alarm” is issued.

RX Level: Indicates the status of the received RF signal level of the ODU. When the level

decreased below the RX threshold level, “Alarm” is issued.

APC: Indicates the status of the synthesizer in the ODU. When any abnormality occurs in the

synthesizer, “Alarm” is issued.

ODU CPU/Cable Open: Indicates the status of the CPU in the ODU or IF cable, When any

abnormality occurs the CPU operation or IF cable is open, “Alarm” issued.

Mute Status: Indicates the control status of the ODU TX power output. When the TX power is set

to Mute, “On” is issued.


LO REF (for XPIC): Indicates the status of reference LO signal used for V/H signal

synchronization. When the reference signal in the ODU is lost, “Alarm” is issued.

TX SW Status (for 1+1 configuration): Indicates the TX SW status for the No. 1 or No. 2 CH

selection.

RX SW Status (for 1+1 configuration): Indicates the RX SW status for the No. 1 or No. 2 CH

selection.


MODEM

Unequipped: Indicates the status of the MODEM existence. When the MODEM is loose

contact or it is not mounted according to the “Equipment Setup”, “Alarm” is issued.

Module: Indicates the status of the modulator-demodulator. When a failure occurred in the

modulator demodulator and as a result of a LSI failure, “Alarm” is issued.

LOF: Indicates the frame synchronization status. When the synchronization from DMR is

lost, “Alarm” is issued, Frame ID: Indicates the status of ID number against MODEM of

opposite station or the other channel in Twin path configuration. When ID number

assignment is improper, “Alarm” is issued.

High BER: Indicates the quality severe deterioration status between radio sections. When

the signal deteriorates below the threshold preset value, “Alarm” is issued. The settable

threshold values are: 1E-3, 1E-4 and 1E-5.

Low BER: Indicates the quality unsevere deterioration status between radio sections. When

the signal deteriorates below the preset threshold value, “Alarm” is issued. The settable

threshold values are: 1E-6, 1E-7, 1E-8 and 1E-9.


MODEM

Early Warning: Indicates quality deterioration status. When the signal deteriorates below

the preset threshold level, “Alarm” is issued. The preset threshold level is less than 1E-9.

MOD: Indicates the operating status of the MOD. When any failure occurs in the modulator

section, “Alarm” is issued.

DEM: Indicates the operating status of the DEM. When any failure occurs in the

demodulator section, “Alarm” is issued.

Input Voltage: Indicates the power supply input voltage status. When power supply is

exceeding the limited, “Alarm” is issued.

Power Supply: Indicates the operating status of the power supply. When power supply is

abnormal, “Alarm” is issued.

IF Cable Short: Indicates the status of IF cable between IDU and ODU. When a short circuit

is caused between ODU and the IDU, “Alarm” is issued.


MODEM

Cable EQL: Indicates the status of IF cable equalizer. When equalizer characteristics control

is lost, “Alarm” is issued.

OPR: When the linearizer function is used.

NO OPR: When the linearizer function is not used. In this case, TX output power decreases

approx. 4 dBm from a standard value.

Linearizer: Indicates the linearizer operating status. When linlearizer operation is improper

in OPR condition, “Alarm” is issued.

ATPC Power Mode: Indicates the status of ATPC operation mode. When the ATPC function

is improper, stop the control and maintain the TX output level at HOLD/MAX/MIN

selectable.


INTFC (Main/Sub)

INTFC(1/2) Module: Indicates the operating status of the ( ) INTFC. When any failure

occurs in the INTFC(1/2) Module, “Alarm” is issued.

INTFC(1) Unequipped: Indicates the existence status of the ( ) INTFC. When the ( )

INTFC(1) is not equipped, “Alarm” is issued.

INTFC(2) Unequipped: Indicates the existence status of the ( ) INTFC. When the ( )

INTFC(2) is not equipped, “Alarm” is issued.

INTFC(1/2) Type Mismatch: Indicates the mounted status of the ( ) INTFC.

When the INTFC(1/2) type is not coincided with the inventory list, “Alarm” is issued.

INTFC(1) In-Phase: Indicates the received signal DADE status between No. 1 and No. 2 at

STM-1 INTFC. When the received signal delay time is out of permissible range, Out phase

alarm is issued.


INTFC (Main/Sub)

STM-1(1) LOS (MUX): Indicates the input signal status of the STM-1 from

MUX. When the input is disconnected, “Alarm” is issued.

STM-1(1) LOF (MUX): Indicates the input signal status of the STM-1 from

MUX. When the input signal is out of frame synchronization, “Alarm” is issued.

E-BER(1) (MUX): Indicates Excessive-BER of the input STM-1 signal from MUX. When

the signal deteriorates below the preset threshold level, “Alarm” is issued. The settable

threshold values are 1E-3, 1E-4 and 1E-5.

STM-1(1) SD (MUX): Indicates the input signal status of the STM-1 from MUX. When the

signal deteriorates below the preset threshold level, “Alarm” is issued. The

settable threshold values are 1E-6, 1E-7, 1E-8 and 1E-9.


INTFC (Main/Sub)

STM-1(1) LOS (DMR): Indicates the signal status of the STM-1 from DMR. When the

input is disconnected, “Alarm” is issued.

STM-1(1) LOF (DMR): Indicates the status of the input STM-1 signal from DMR. When

the input signal is out of synchronization, “Alarm” is issued.

STM-1(1) E-BER (DMR): Indicates Excessive-BER of the input STM-1 signal at the Radio

side. When the signal deteriorates below the preset threshold level,

“Alarm” is issued. The settable threshold values are 1E-3, 1E-4 and 1E-5.

STM-1(1) SD (DMR): Indicates the input signal status of the STM-1 from DMR. When the

signal deteriorates below the preset threshold level, “Alarm” is issued. The

settable threshold values are 1E-6, 1E-7, 1E-8 and 1E-9.

STM-1(1) TF: Indicates the signal interruption status. Indicates when MS-AIS Generation

is set to “Disable”. When STM-1 output signal of STM-1 INTFC is

stopped, “Under Execution” is indicated.


CTRL

CTRL Module: Indicates the operating status of the CTRL. When any failure occurs in the

CTRL Module, “Alarm” is issued.

MMC: Indicates the MMC status. When the mounted MMC is detected, “On” is displayed.

APS SW Fail (for APS): Indicates the APS status of the APS system. When

the APS switchover failure occurs, “Alarm” is issued.

APS Online Status (for APS): Indicates online channel on the APS system.


Loopback

When loopback condition is necessary, set the system to loopback condition.

When there is an interruption of signals, use the STM/SONET analyzers and isolate

the faulty section by checking the traffic signal by loopback. Setup the test quipment

according to the following diagram.


Loopback

Notes:

1. Service will be interrupted during Loopback condition.

2. Following Loopback operation is not performed simultaneously.

• IF Loopback

• Near End Loopback

• Far End Loopback

3. Loopback operation is not performed with an opposite station simultaneously.


Loopback

• IF loopback

Used for localizing equipment failure to ODU or IDU. The input STM-1 signal from

MUX is looped back at IF stage.

If no abnormality is found in the signal after IF loopback, then the ODU has a

problem.

• STM-1 loopback (NEAR END)

Used for localizing equipment failure to MUX equipment or radio equipment.

The input STM-1 signal from MUX is looped back and then output with STM-1

signal. If no abnormality is found in the signal with NEAR END loopback, then

the radio equipment (IDU or ODU) has a problem.

• STM-1 loopback (FAR END)

Used for localizing equipment failure to MUX equipment or radio equipment.

Signal is looped back at the IDU of the opposite station.

If no abnormality is found in the signal through FAR END loopback, then the local

radio equipment (IDU or ODU) has no problem.


ODU TX Section Troubleshooting Flowchart

ODU RX Section Troubleshooting Flowchart

IDU Section Troubleshooting Flowchart

1-IF Connector Termination

1-Connector Material Check

Verify that all connector Accessories are complete as

1- Lock Nut

2- Washer

3- Gasket

4- Clamp A

5- Clamp B

6- Center Conductor

7- Insulation

8- Connector Shell

Clamp B

Clamp A

Insulation

Gasket

Washer

Lock Nut

Center Conductor

Connector Shell

IF Cable Termination

1-First, Fit the Lock Nut, Washer and

Gasket on the Cable as shown

Gasket

Lock Nut

washer


2-Strip Back the cable sheath,

taking care not to damage the

braided shield.

Fit Clamp A


3-Fold back the Braided shield,

Separating the strands of the braid.

Cut the extra

length, to fit to

Clamp A


4-Cut away the insulation from the center

conductor and fit the clamp B.

Be sure not to cut or scratch the

conductor while stripping the

insulation


5- Cut the center conductor to fit the connector center

contact (~1.2cm).

6- Mount the center contact onto the center conductor

7- Mount the Insulation onto the center contact.

Insulation


8-Insert the cable into the connector shell

9- Tighten the Lock Nut.

Insure the good tighten condition using the

suitable wrench


10- Check the connector-cable continuity using multemeter.

11- Cover the outdoor connector with rubber tape.

12- Cover the rubber tape with all weather vinyl tape.

13- The connector is ready for use.


1.4 Cable Termination

1.4.2 Power Cable Termination


Power Cable Termination

Power

Cable

Socket Contact


Power

Connector

1-Remove 3.0 to 3.5 mm of Insulation

2- Set the socket contact to the

following position onto the

hand crimping tool

1

Hand Crimping tool

(57026-5000)

Position ia. of CabledCrimping Type

57026-5000 Ф 1.5 to 1.8 1

Ф 1.8 to 2.2 2

57027-5000 Ф 2.3 to 2.6 1

Ф 2.6 to 3.1 2

2


3- Squeeze the handle of the hand crimping tool, insert cable into socket contact

4- Cable should fit, so insulation and bare wire are arranged as shown,

5- Squeeze the handle of the hand crimping tool until ratchet is released.


6- Insert socket contacts to power connector till they

locked and be sure it is well fixed.

5-Squeeze the handle of

the hand crimping tool

until ratchet Is released


Power Connector

The Connector is ready to use


Local Craft Terminal (LCT)


Please refer the document for NEO/i LCT setup.

Before connecting the LCT, you need to install the USB driver, JAVA 2 Runtime and the Dial-

up.

Please note that do not perform the dial-up setup before the USB driver installation has not

been completed.


Check that the IF Cable between the Modem and the ODU is firmly

connected.

Before connecting the power cable connector to the Modem, check that the SEL V input

voltage is -48V (within allowable range) with the digital multimeter.

Pull out the power switch lever and turn ON.

Confirm that the PWR indicator on the Modem is ON.


The initial setup of the IDU/ODU is performed using the PC according to the following order.

Equipment setup.

Date and Time.

Provisioning.

Miscellaneous (Relay / Housekeeping etc).


The Equipment Setup items for the SDH systems are as follows :

User Interface

Redundancy

Main (Working)

Sub (Prot)

APS Function *

Transmission Capacity

Frequency Band/Sub Band

TX/RX Frequency

Frame ID

Transmit Power Control

LAN Port Usage **

LAN Port Capacity **

Note :- * For SDH APS Only

** For LAN Transmission Only.


The Provisioning Setup items for the SDH systems are as follows :

BER Threshold Setting

SUB Interface *

SC Assignment

STM-1 Setting

TX Power Control **

Condition for TX/RX SW

Condition for APS ***

Relay Setting

TCN Threshold (15min)

TCN Threshold (1 Day)

PMON Select

Others ****

Note :- * For WS/LAN Transmission Only

** Required to set the Power control in MTPC Mode while alignment.

*** For APS Configuration Only

**** Optional items


Antenna Orientation :

After the initial setup has been completed, antenna orientation is performed according to the

following procedure

Connect to the LCT using the standard USB cable.

At each station, select Maintenance mode from the LCT menu.

Turn ON the Maintenance Mode 1.

Select ON the Antenna Alignment Mode from the Maintenance Menu *

At each station, connect the digital multimeter to the RX LEV MON jack on the ODU.

At each station, adjust the azimuth and elevation angles of the antenna alternately so that the measured

voltage becomes maximum.

Note:- * In order to measure the exact performance of AGC V, it is required to set the Antenna

Alignment Mode ON

Pasolink Network Management Terminal

(PNMTj)

PNMTj

The PNMT is a computer-based PASOLINK Network Management Terminal system developed

by NEC for management of NEC’s PASOLINK wireless transmission network.

The PNMT is a scaled down version of PASOLINK Network Management System (PNMS)

that is designed as a maintenance tool for field engineers to locally and remotely monitor alarms,

control points, generate reports, and archive data, all within a familiar graphical user interface,

and all in real time.

This software package remotely monitors and controls the status and configuration of an

entire PASOLINK network with associated equipment as well as the performance of the actual

microwave links.

PNMTj

Login User

Data

Window

Block DiagramNE-Specific Menu Bar

Common

Tool Bar

Common

Menu Bar

Title Bar

The title bar of the window is used to indicate the title of the window.

Common Menu Bar

The common menu bar of the window presents the System and Help options, illustrates the

commands that can be executed from the various options.

NE-specific Menu Bar

This menu is a list of tasks that can be performed to the specific network element (NE) displayed in

the PNMT. Configuration, Event Log, and Link Performance Monitor functions can be executed in the

NE-specific menu bar.

Block Diagram

The block diagram illustrates the equipment/part of the PASOLINK wireless system. Its main

purpose in the window is to display the current summary alarm state of the equipment. You can click

a specific block to display the status of equipment in the data window.

Tabs

Radio Button

Command Button

Text Box

Data Window

This window displays in detail the status and alarm items of a specific equipment/part of the NE.

You can select the tab or the block of the specific equipment/part which you want to monitor in the

data window.

Tabs

To view the status and alarms in the specific part of the NE, click on the tab at the bottom of the

Data window.

Command Button

The command button is used to enter the data selected on the pop-up window into the computer.

Text Box

This is a standard Windows dialog box where the user inputs the desired value.

Login User

This indicates the user currently logged-in to the PNMT.

Configuration files Downloading


This function is used to download configuration files created by the NetConfig Tool to the PM Card

in the selected NE.

There are two files created for each NE – MIB.cfg and Network.cfg.

MIB.cfg contains file contains relevant information about the equipment (i.e. name, pm type, etc.)

and housekeeping (Aux. I/O).

Network.cfg contains the IP address of the target NE as well as the IP address of the opposite NE

and the information about the network where the target NE is located.

Click on the CONFIGURATION FILE button under the DOWNLOAD (PC>>PMC) in the PMC

window to open the Download Configuration file window.



Select each type of config file one by one from the type window

Browse and select the path location to the file selected in the type window

Click execute button to download the selected config file

Repeat the download procedure for the other config file.

A message window indicates the status of the download operation and it will close automatically

once the operation is over.



After the successful download of the configuration files, click UPDATE button. Update

Configuration File window opens.

Select the appropriate box for the type of configuration file(s) that will be updated.

Click OK button to start the update operation.

While updating CFG file, PMC to PMC communication will be lost when PMC initializes to the

new system configuration. During this time, PNMT connection to the Pasolink will be lost but will

be automatically be reconnected after the PMC resets.

Thanks for your Attention.

Have a nice day.

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