3 otf202202 opti x rtn 900 routine maintenance

OptiX RTN 900 Routine Maintenance

Confidential Information of Huawei. No Spreading Without Permission

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Contents

Safety Precautions..................................................... ... ...............Page 2

Routine Maintenance....................................................... .............Page10

Common Maintenance Operations................................. ..............Page25



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After the course, the trainees should list the routine maintenance items, and be

clear about the purpose of those items. This is the basics of OptiX RTN 900

maintenance, and do them well can prevent equipment from some faults.

Besides listing the routine maintenance items, trainees also must grasp the

correct maintenance operations of OptiX RTN 900, that is important in the

maintenance and troubleshooting.

Through the checking of routine maintenance items of OptiX RTN 900,

operators also need to judge some of the common faults by using some

common method like observe indicator, calling orderwire, etc.

Reference is “RTN 910 Maintenance Guide” and “RTN 950 Maintenance Guide”



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There are 3 chapters in this course. Chapter 1 describes parts of the

precautions to be taken during installing, operating, and maintaining the

equipment.



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Read and follow the safety precautions before installing, operating, and

maintaining the equipment.



P-4

The grounding requirements are applicable to the equipment that needs

to be grounded.



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P-7

Before turning the toggle lever switch (ODU power switch on the IF board),

please pull it out slightly.



P-8

Before inserting the IF jumper into the IDU or removing the IF jumper or IF cable

from the IDU, the ODU must be powered off .

In the case of an RG-8U or a 1/2-inch IF cable, the IF cable is connected to the

IDU through an IF jumper. In the case of a 5D IF cable, the IF cable is directly

connected to the IDU.

Do not remove or insert the IF jumper or IF cable when the ODU is powered on.



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Before inserting the IF cable into the IDU or removing the IF cable from the IDU,

the ODU must be powered off.

Do not remove or insert the IF cable when the ODU is powered on.



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Routine maintenance items are classified into three categories: routine

maintenance items carried out through the NMS, field maintenance items for

indoor equipment, and field maintenance items for outdoor equipment.



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The operator on site can judge the service is normal or not by observing the

“SRV” indicator. For example, if the “SRV” indicator lit red, usually is caused by

the receiving power problem and the service in this board is lost or switched to

other board. You may take out the patch cord or the cable to check.

Note:

The STAT indicator on some boards may not light when the equipment

is powered on due to data configuration.



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If bit errors cross the threshold, it needs to check the link indicator on IF board

and ODU receiving power via NMS for reference, also needs to exclude the

weather condition.



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If the voice in the conversation through orderwire call is not clear and with noise,

it needs to check the connection between phone and IDU first, then observe the

indicators on IF board to check status of microwave link for reference.



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Checking the equipment room periodically not only ensures that the equipment

can operate normally in appropriate temperature and humidity conditions, but

also reduces the fault rate and increases the service life of the equipment.

Procedure

Record the reading of the thermometer in the equipment room. The

normal temperature should be between –5ºC and +55ºC.

Record the reading of the humidity meter in the equipment room.The

normal humidity should be between 5% and 95%.

Check whether the equipment room meets the disaster protection

requirements. Ensure the following points:

There are portable foam fire extinguishers in the equipment room.

The fire extinguishers should be in their service life.

There is no rain leakage or water penetration in the equipment

room.

There are no mice or insects in the equipment room.

Clean the equipment room. Ensure that there is no dust on the cabinets,

on the equipment



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In the OptiX RTN 900 system, out door parts are composed of the ODU, hybrid

coupler, antenna and IF cable, so the field maintenance items for outdoor

equipment are mainly for them.



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Procedure

Ensure that the ODU is located within the protected area of the lightning

arrester. In plain areas, the lightning arrester protects the areas within an

angle of 45°under it. In mountainous areas and the areas where

lightning frequently occurs, the lightning arrester protects the area within

an angle of 30° under it.

Ensure that the ODU is properly fixed on the antenna.

Ensure that the ODU is not damaged.

Ensure that the interface between the ODU and the hybrid

coupler/antenna is waterproof.

Ensure that the protection grounding cable of the ODU is firmly and

reliably grounded.



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Procedure:

Ensure that the hybrid coupler is located within the protected area of the

lightning arrester. In plain areas, the lightning arrester protects the areas

within an angle of 45° under it. In mountainous areas and the areas

where lightning frequently occurs, the lightning arrester protects the area

within an angle of 30°under it.

Ensure that the hybrid coupler is properly fixed on the antenna.

Ensure that the hybrid coupler is not damaged.

Ensure that the interface between the hybrid coupler and the antenna is

waterproof.



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Procedure

Ensure that the antenna is located within the protected area of the

lightning arrester. In plain areas, the lightning arrester protects the areas

within an angle of 45°under it. In mountainous areas and the areas

where lightning frequently occurs, the lightning arrester protects the area

within an angle of 30° under it.

Ensure that the antenna is reliably fixed on the pole.

Ensure that the antenna radome is not damaged.

Ensure that there is no accumulated water in the antenna.

Ensure that the fastening bolts are fastened. Ensure that the azimuth

angle and the elevation angle of the antenna meet the design

requirements

In the case of separate mounting, ensure that the installation parts are

installed firmly and that the connectors are fastened.

Check and ensure that the interface of the feed boom is sealed and

waterproofed properly.



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Procedure:

Check the appearance of the IF cable.

The IF cable must not be bent or twisted.

There must be no bare copper wire.

The bending radius of the IF cable must be larger than 30 cm.

Check the connectors of the IF cable.

The connectors of the IF cable must be reliably connected to the

ODU.

The connectors of the IF cable must be waterproof.

Check the grounding of the IF cable.

The grounding clip must be waterproof.

The grounding cable must be routed from top downwards. The

angle between the grounding cable and the IF cable must not be

more than 15 degrees.



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Checking the NE Status

By checking the NE status periodically, you can detect the NE faults in

time.

Browsing the Current Alarms

A current alarm is an alarm that is not cleared. Browsing the current

alarms periodically helps in detecting and rectifying faults in time.

Browsing the History Alarms

A history alarm is an alarm that is cleared. Browsing and storing the

history alarm information periodically helps in locating and rectifying

faults.

Browsing the Abnormal Events

This topic describes how to browse the abnormal events. An abnormal

event is an abnormality that arises in the system at a particular time and

not an abnormality that persists for a long time. Browsing the abnormal

events periodically helps in detecting equipment faults in time.

Browsing Current Performance Events

Periodically browsing the performance events helps you to check the

long-term running status of the equipment. Hence, the latent hazards

can be detected and cleared in time. The counter of current performance

events measures all the performance events that arise between the start

time of the monitoring period and the current time.

Browsing the History Performance Events

Periodically browsing and storing the history performance events helps

in locating faults.



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Browsing the History Transmit Power and Receive Power

By browsing the history transmit power and receive power periodically,

you can know the change trend of the history transmit power and receive

power, which provides references for troubleshooting the radio link.

Testing the IF 1+1 Switching

Testing the IF 1+1 switching periodically helps in checking whether

switching can be performed on the equipment normally.

Testing the IF N+1 Switching

Testing the IF N+1 switching periodically helps in checking whether

switching can be performed on the equipment normally.

Applies only to the equipment that is configured in 1+1 protection mode.

During the 1+1 protection switching (< 500 ms), the protected services are

interrupted. Hence, it is recommended that you perform the 1+1 protection

switching when the traffic is light.



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Hardware loopback is classified into optical cable loopback, PDH cable

loopback, and Ethernet port loopback.

Optical fiber loopback indicates that the receive and transmit optical

fibers are connected through a fiber jumper on the ODF. In certain

occasions, an optical attenuator is added based on the actual situation,

to prevent the optical board from being damaged by the excessive

receive optical power.

PDH cable loopback indicates that the receive and transmit PDH cables

are connected through a short-circuiting cable or connector on the DDF.

Ethernet port loopback indicates that the receive and transmit service

signals on one Ethernet port are looped back through a special loopback

Ethernet cable.



P-27

During following the above 3 steps to plug out the board, we must operate

slowing and make sure operation not affect the other running boards.



P-28

During following the above 3 steps to plug in the board, we must operate

slowing and make sure there is no any blocking in the slot. And in the step 1

above, it is not allowed to push the board along the guiding rail by force if when

there is some blocking inside.



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When the IF board is replaced, the unprotected services on the board are interrupted.

Prerequisite

You must know the impact of board replacement.

You must know the specific position of the board to be replaced.

You must know the service protection and protection channels of the board to be replaced.

The spare board must be available, and the version and type of the spare board must be the same as the version and type of the board to be replaced. You can query the board manufacturing information to obtain the version of the board to be replaced.

Optional

If the services on the board are configured with SNCP, ensure that the services are already switched to the protection channel.

1. Query the SNCP protection group.

2. If the port on the board functions as the current working channel, the current protection channel is not on the board, and the state of the current protection channel is normal or SD,perform the forced switching.

If the services on the radio link are configured with 1+1 protection, switch the service to the protection IF board.

1. Query the IF 1+1 protection group.

2. If the board functions as the current working board, and the state of the current protection board is normal or SD, perform the forced switching

If the services on the radio link are configured with N+1 protection, ensure that the services are already switched to the protection IF board.

1. Query the IF N+1 protection group.

2. If the board functions as the current working board, and the state of the current protection board is normal or SD, perform the forced switching.

If the IF board is configured with the XPIC function, see Setting the State of an ODU Transmitter and mute the ODU at the opposite end.



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Optional:

If the forced SNCP switching has been performed for the services,

release the forced switching.

If the forced protection switching has been performed for the radio link,

release the forced switching.

If the IF board is configured with the XPIC function, see Setting the State

of an ODU Transmitter and unmute the ODU at the opposite end.



P-31

When the SDH optical interface board is replaced, the unprotected services on the board are interrupted.

Prerequisite



You must know the service protection and protection channels of the board to be replaced.

The spare SDH optical interface board must be available, and the version and type of the

spare board must be the same as the version and type of the board to be replaced. You can query the board manufacturing information to obtain the version of the board to be replaced.

Optional:

If the services on the board are configured with SNCP, ensure that the services are already switched to the protection channel.

1. Query the SNCP protection group.

2. Perform the forced switching, if the port on the board functions as the current working channel, the current protection channel is not on the board, and the state of the current protection channel is normal or SD.

If the services on the board are configured with linear MSP, ensure that the services are already switched to the protection channel.

1. Query the linear MSP group.

2. Perform the forced switching, if the port on the board functions as the current working channel, the current protection channel is not on the board, and the state of the current protection channel is normal or SD.

If the forced switching has been performed on the board, release the forced switching.

If the linear MSP switching has been performed for the services, release the forced switching.



P-32

When the PDH interface board is replaced, the services on the board are

interrupted.

Prerequisite



You must know the service protection and protection channels of the

board to be replaced.

The spare board must be made available, and the version and type of

the spare board must be the same as those of the board to be replaced.

You can query the board manufacturing information to obtain the version

of the board to be replaced.



P-33

When the Ethernet interface board is replaced, the unprotected services on the

board are interrupted.

Prerequisite







You can query the board manufacturing information to obtain the version

of the board to be replaced.



P-34

Prerequisite

You must be aware of the impact of board replacement.






You can query the board manufacturing information to learn about the

version of the board to be replaced.

Impact on System

If no protection board is available, the replacement of the system control,

switching, and timing board results in service interruption.

After the NE starts up normally, the STAT indicator on the board is green, and

the PROG indicator on the board is off.

In the process of restoring the NE database, the PROG indicator on the board

blinks in green.

If the PROG indicator stops blinking and is on and green for 10 seconds, it

indicates that the deployment script is run successfully. The PROG indicator is

then normally on and green.

If the PROG indicator stops blinking and is on and red for 10 seconds, it

indicates that the deployment script is run unsuccessfully. The PROG indicator

is then normally on and green. In this case, contact Huawei technical support

engineers for rectifying the fault.



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P-36

Install the ODU

a. Remove the protective cap on the antenna interface of the ODU. Apply

an appropriate amount of lubricant to the gasket of the feeder on the

antenna, coupler, or ODU adapter.

CAUTION:

Do not dispense the lubricant on the front panel of the feeder.

Otherwise, it may affect the signal transmission.

b. Keep the direction indicated by the polarization arrow on the ODU

consistent with the polarization direction of the antenna or hybrid

coupler. (In the case of vertical polarization, keep the polarization arrow

vertical. In the case of horizontal polarization, keep the polarization

arrow horizontal). Slowly fit the antenna interface of the ODU into the

feeder until the four latches on the ODU engage with the hooks on the

antenna.

c. Lock the four latches in a diagonal order.



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P-38

Procedure (Querying the Board Information Report)

Choose Inventory > Physical Inventory > Board from the Main Menu.

In Physical Inventory, click the Board List tab.

Click Filter.In Set Board Filter Criteria window, set the board attributes

that need to be queried. Click OK.

Optional: Click Save As. Then, you can save and archive the board

information as a text file.

Procedure (Querying the Board Manufacturing Information Report)

Choose Inventory > Project Document > Board Manufacture

Information from the Main Menu.

In Board Manufacture Information, click the Board Manufacture

Information tab.

Select one or multiple NEs from the left pane, and click .

Optional: Click Save As. Then, you can save and archive the board

manufacturing information as a text file.



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Setting Loopback for the SDH Optical Interface Board

The optical interface board supports the optical interface inloop and the

VC-4 path outloop

Setting Loopback for the Tributary Board

The tributary board supports the tributary inloop and outloop

Setting Loopback for the Ethernet Interface Board

The Ethernet interface board supports the Ethernet port inloop (at the

MAC layer and PHY layer)

Setting Loopback for the IF Board

Loopbacks on the IF board are classified into IF port loopback,

composite port loopback, VC-4 path loopback, and IFUP port MSC

loopback. The IF1 board supports the IF port inloop, IF port outloop, and

VC-4 path inloop. The IFU2 board supports the IF port outloop,

composite portinloop, composite port outloop, and IFUP port MAC inloop.

The IFX2 board supports thecomposite port inloop, composite port

outloop, and IFUP port MAC inloop.



P-40

Cold reset causes service interruption because it is similar to the procedure of

removing and inserting a board.

Procedure

Step 1 In NE Panel, right-click the board where the warm reset needs to

be performed.

Step 2 Choose Warm/Cold Reset from the shortcut menu. Then, the

Warning dialog box is displayed.

Step 3 Click OK.

Step 4 Close the dialog box that is displayed.



P-41

Caution

During the PRBS test, the services on the tested path are interrupted.

The PRBS test can be performed only on one path and in one direction.

Procedure

Set the loopback at the proper location. For details.

Select the E1 interface board from the Object Tree.

Choose Configuration > PRBS Test from the Function Tree.

Select the port to be tested.

Set Duration and Measured in Time.

The PRBS test supports three time units: one second, 10 minutes, and one hour.

A maximum of 255 test cycles is permissible for the PRBS test.

Optional: Select Accumulating Mode.

Click Start to Test.Then, a prompt dialog box is displayed.

Click OK.

When Process is displayed as 100%, click Query to check the test result.

Note

The result of a PRBS test can be normal, error, or invalid.

Invalid: indicates that no bit is received. The curve should be yellow.

Normal: indicates that the path is working properly. The number of PRBSs should be zero, and the curve should be green.

Error: indicates that the path has errors. The number of total PRBS should be larger than zero, and the curve should be red.



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P-43

Caution

During the PRBS test, the services on the tested path are interrupted.

The PRBS test can be performed only on one path and in one direction.

Before you perform the PRBS test for the protection IF board of a 1+1 HSB/FD/SD protection group, you must switch the protection IF board to the working state manually.

The protection IF board does not support the PRBS test. To test the protection radio link, you need to power off the main ODU and perform the PRBS test on the main IF board. In this case, the PRBS signals are sent out of the protection IF board through the protection bus, thus implementing the PRBS test of the radio link.

Procedure

Perform an outloop on the IF board. For details, see 7.3.4 Setting Loopback for the IF Board.

Select the IF board from the Object Tree.

Choose Configuration > PRBS Test from the Function Tree.

Select the port to be tested.

Set Duration and Measured in Time.

The time unit of the PRBS test can be one second, 10 minutes, or one hour.

A maximum of 255 test cycles is permissible for the PRBS test.

Optional: Select Accumulating Mode.

Click Start to Test. Then, a prompt dialog box is displayed.

Click OK.

When Process is displayed as 100%, click Query to check the test result.



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3 otf202202 opti x rtn 900 routine maintenance

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