3 otf202202 opti x rtn 900 routine maintenance

OptiX RTN 900 Routine Maintenance P-0

 Contents
 Safety Precautions..................................................... ... ...............Page 2
 Routine Maintenance....................................................... .............Page10
 Common Maintenance Operations................................. ..............Page25

Confidential Information of Huawei. No Spreading Without Permission


 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”



 There are 3 chapters in this course. Chapter 1 describes parts of the
precautions to be taken during installing, operating, and maintaining the
equipment.



 Read and follow the safety precautions before installing, operating, and
maintaining the equipment.



 The grounding requirements are applicable to the equipment that needs
to be grounded.



 Before turning the toggle lever switch (ODU power switch on the IF board),
please pull it out slightly.



 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.



 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.



 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.



 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.



 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.



 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.



 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 –5º and +55º
C C.
 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



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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
 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
 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.



 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.


 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.

3 otf202202 opti x rtn 900 routine maintenance

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