Nokia MetroSite Base Station User Manual û Maintenance

8/9/2019 Nokia MetroSite Base Station User Manual û Maintenance

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Nokia MetroSite Base Station User Manual

User Manual

468953A

DN9913495 © Nokia Networks Oy 1 (46)

Issue 2-0 en Nokia Proprietary and Confidential

Maintenance



Maintenance

2 (46) © Nokia Networks Oy DN9913495

Nokia Proprietary and Confidential Issue2-0en

The information in this document is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This document is intended for theuse of Nokia Networks' customers only for the purposes of the agreement under which thedocument is submitted, and no part of it may be reproduced or transmitted in any form ormeans without the prior written permission of Nokia Networks. The document has beenprepared to be used by professional and properly trained personnel, and the customerassumes full responsibility when using it. Nokia Networks welcomes customer comments aspart of the process of continuous development and improvement of the documentation.

The information or statements given in this document concerning the suitability, capacity, orperformance of the mentioned hardware or software products cannot be considered bindingbut shall be defined in the agreement made between Nokia Networks and the customer.However, Nokia Networks has made all reasonable efforts to ensure that the instructionscontained in the document are adequate and free of material errors and omissions. NokiaNetworks will, if necessary, explain issues which may not be covered by the document.

Nokia Networks' liability for any errors in the document is limited to the documentary correctionof errors. Nokia Networks WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS INTHIS DOCUMENT OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this document or theinformation in it.

This document and the product it describes are considered protected by copyright according tothe applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this document may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Networks Oy 2000. All rights reserved.





Contents

Contents 3

1 About this document 7

2 General 92.1 Fault reporting 92.2 Site folder 92.3 Environmental restrictions 92.4 Maintenance procedure 102.5 Removing the BTS cover 10

3 Periodic maintenance 133.1 Cabinet maintenance 13

3.1.1 Fan unit and air circulation 133.1.2 Cover 133.1.3 Seals 143.1.4 Lock 143.2 Tests 14

4 LED indicators 154.1 Transceiver unit LED 154.2 Transmission unit LED 154.3 Interface unit LED 164.4 Power supply unit LED 174.5 Fan unit LED 17

5 13MHz clock adjustment 195.1 Adjustment procedure 19

6 Troubleshooting 23

7 Using Nokia BTS Manager 257.1 Starting and exiting Nokia BTS Manager session 257.2 Using Help 26

8 Replacing units 278.1 Replacing TRXs 298.1.1 TRX slots 30

8.1.2 Replacing a slave TRX 308.1.3 Replacing the master TRX in BTS configurations with two or moreTRXs 31

8.1.4 Replacing the master TRX in a single TRX BTS 338.2 Replacing the transmission unit 338.3 Replacing the interface unit 368.4 Replacing the power supply unit 378.5 Replacing the cooling fan assembly 378.5.1 Replacing the standard cooling fan unit 398.5.2 Replacing the high capacity cooling fan unit 40



Maintenance



9 Expanding the BTS capacity 43

Index 45





Summary of changes

Version 1, 12th November 1999.

Version 2, 22nd June 2000:

• Added GSM to title and body text

• Added high capacity fan assembly (Figure 5)

• Added 13MHz clock adjustment procedure



Maintenance





About this document



1 About this document

This document gives instructions on the maintenance of the Nokia MetroSiteGSM Base Station (BTS). Read carefully Nokia MetroSite GSM Base Station:Warnings and Cautions before starting the maintenance work.

This document covers the following:

• Periodical maintenance measures

• LED conditions of the MetroSite GSM BTS units

• 13MHz clock adjustment

• Replacing units

• Expanding the BTS capacity

Refer to the SW release documentation for the SW updating instructions.



Maintenance





General



Note

2 General

This chapter describes the general issues that must be considered in themaintenance of the Nokia MetroSite GSM BTS.

2.1 Fault reporting

Correct all damage, failures and faults, if possible, and report them to Nokia usingthe Failure Report Form provided by Nokia Customer Services.

You can save the alarm information with the Nokia BTS Manager to a log file onyour PC.

2.2 Site folder

A site folder contains site-specific information required on the site. The sitefolders include installation, commissioning and integration check list. The exactcontents of the site folders are defined by the customer project.

It is the responsibility of the customer to maintain and archive site-specificdocuments.

2.3 Environmental restrictions

When the cover of the Nokia MetroSite GSM BTS is removed for maintenancework, the following restrictions must be considered:



Maintenance



Note

1. Rain or snow must not be allowed to fall on the internal surfaces of theequipment. The internal surfaces are the front panels, cables, connectorsand documentation.

2. The cover must not be removed in environments where dust can be blowninto the cabinet.

2.4 Maintenance procedure

General maintenance procedure:

1. Check the tools needed for the type of maintenance. You should alwayshave the BTS key, antistatic wrist strap, and the Nokia BTS Manager PCand PC cable with you.

2. Keep the units in their delivery package until installation.

3. Perform the maintenance actions as specified in this document.

4. After installation, keep some of the packing material for sending units toservice. Recycle remaining material.

2.5 Removing the BTS cover

The cabinet internal maintenance requires removing the BTS cover. Beforeremoving the cover, the environmental restrictions presented in this documentmust be taken into account.

Removing the cover issues an alarm to the BSC. Make sure that the BSC/NMSpersonnel is notified before removing the cover.

To remove the BTS cover:

1. Open the lock at the bottom of the BTS.



General



2. Grip the cover from the bottom and the top and lift until the locking guidesat the side of the cover come out from the locking recesses.

3. Remove the cover.

4. Hang the cover on the hook at the side of the cabinet. Use the safety strapto secure the cover to the hook. You can also place the cover on the floor.



Maintenance





Periodic maintenance



WARNING

Caution

3 Periodic maintenance

This chapter describes the periodic maintenance of the MetroSite GSM BTS.

Potentially lethal voltages!

The BTS power must be switched OFF from the disconnect device or circuitbreaker before starting the maintenance work, whenever the nature of maintenance work causes a risk of electric shocks!

3.1 Cabinet maintenance

This section describes the cabinet maintenance measures.

3.1.1 Fan unit and air circulation

The fan unit must be cleaned of leaves and debris, whenever necessary. Also airinlets and outlets must be unobstructed to maintain proper circulation of air.

3.1.2 Cover

Clean the BTS cover of stains and dust whenever necessary. Wipe the surface of the cover with a piece of cloth moistened with water and washing agent.

Do not use any washing agents that contain alkalis, esters, ketones, aromatic,chlorinated, or fluorinated hydrocarbons, since these may damage the cover.Washing agents containing these chemicals can only be used if approved by themanufacturer for cleaning polycarbonate objects.



Maintenance



Caution

Do not spill any water or chemicals under the cover.

3.1.3 Seals

Wipe the BTS seals (seal on the lower edge of the BTS, under the cover)whenever they are dirty. The length of the cleaning intervals depends on theenvironment.

Check the visible seals during every site visit. If the seals are dirty, wipe themclean with a piece of cloth. Replace worn or broken seals.

3.1.4 Lock

Lubricate the lock during site visits with lubricating oil. If the cabinet is used intemperatures below 0ºC (32ºF), lubricate the lock with lubricating anti-freeze oilor use both anti-freeze oil and lubricating oil.

3.2 Tests

If there is any reason to assume that the quality of calls in a cell is degraded, or

that the number of calls in a cell is reduced from normal, the Abis loop test andthe TRX test can be run remotely from BSC/NMS.A TRX test alsobe run locallywith the Nokia BTS Manager. By means of these tests, the condition of hardwarecan be verified.



LED indicators



4 LED indicators

In addition to the alarms, which a network element can produce, most functionalentities also have a three-colour LED indicators. These indicators display thecurrent state of the equipment as a quick on-site reference.

This chapter specifies the meaning of the LED condition on each unit. Thefollowing units are equipped with LED indications for local operation checking:

• Transceiver unit

• Transmission unit

• Power supply unit

• Interface unit

• Fan unit

4.1 Transceiver unit LED

The conditions on the transceiver unit’s LED are specified in Table 1.

4.2 Transmission unit LED

The conditions of the transmission unit’s LED are specified in Table 2.

Table 1. LED conditions of TRX

LED Colour Lit continuously Flashing

Green In service

Traffic going through

In service

No traffic going through

Yellow/Orange No LapD Configuring, not in service

Red Unit broken Unit operation degraded



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The RRI transmission units incorporate an additional LED for the Flexbusinterface. The conditions of this LED are presented in Table 3.

4.3 Interface unit LED

The conditions of the interface unit LED are specified in Table 4.

Table 2. LED conditions of transmission unit

LED colour Lit continuously FlashingGreen Power is on and the

operation is continuous

error-free

Unit is currently being

accessed with a

transmission management

device

Yellow/ Orange Control or test ongoing, or

fault in incoming signal

Configuring, not in service

Red Serious fault, or an active

test interfering with normal

traffic

-

Table 3. LED conditions of RRI units Flexbus LED.

LED Colour Lit continuously Flashing

Green DC power feed to the

outdoor unit and TX signal

active

DC power feed to outdoor

unit active, TX signal not

active

No light No power feed or TX signal N/A

Table 4. LED conditions of interface unit

LED colour Indication

Green OCXO operating

Yellow OCXO warming up

Red OCXO broken



LED indicators



4.4 Power supply unit LED

The condition of the power supply unit’s LED are specified in Table 5.

4.5 Fan unit LED

The conditions of the fan unit’s LED are specified in Table 6.

Table 5. LED conditions of the power supply unit

LED colour Condition

Green Unit operating

Yellow 1. Output voltage OK, switch on power supply unit

in ON position, BTS in cold start mode

2. Power shut down signal sent from the BSC/

NMS

3. Output voltage OFF because of a detectedovertemperature

Red Unit broken or short circuit in one of the BTS’s

units

Flashing yellow Input voltage OK, switch the power supply unit to

the stand-by position

Table 6. LED conditions of the fan unit

LED colour Conditions

Green Unit operating

Yellow Operation degraded

Red Unit broken



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13MHz clock adjustment



Note

5 13MHz clock adjustment

The 13MHz clock is adjusted with the MetroSite BTS Manager and a frequencycounter.

The 13MHz clock should only need to be adjusted after a new installation or whenthe VIFA units is replaced.

5.1 Adjustment procedure

Before commencing the adjustment procedure, switch ON the frequency counterand allow about 15 minutes stabilising time, or as recommended by theinstrument’s manufacturer.

Carry out the adjustment of the 13MHz clock according to thefollowing procedure:

1. Unlock and remove the BTS cabinet cover.

2. Remove the rubber dust shield from the side of the VIFA unit.

3. Connect the frequency counter to the X7 connector of the VIFA unit (firstsocket from the front). See Figure 1.

4. Connect the Nokia BTS Manager laptop PC to the LMP port of the VIFAunit. See Figure 1.



Maintenance



Figure 1. 13MHz clock adjustment

5. Start the Nokia BTS Manager.

6. Open the calibration menu by selecting OBJECTS in the menu bar.

7. Select CLOCK CONTROL from the drop-down menu.

8. In the Clock Control window, enter a DAC word which will tune the clock to 13MHz ±1Hz.



13MHz clock adjustment



Note

Change the DAC word either by means of the slider or by typing the DACword directly in the box, see Figure 2.

To increase the frequency, increase the DAC word. The range of the DAC wordis from 0 to 4095, providing an adjustment of ±25 Hz.

Figure 2. Clock control window - coarse adjustment

If the frequency of the clock is very close to that required, click the RHmouse button in the USE FINE SCALE box of the Clock Control window(see Figure 3), this will allow a finer control of the DAC word slider.



Maintenance



Figure 3. Clock control window - fine adjustment

9. Save the DAC word by clicking SAVE CURRENT PERMANENTLY inthe Clock Control window and press Enter.

Saving the DAC word permanently will ensure that it remains in memory

after reset.

10. When asked if you want to continue, select YES and press enter.



Troubleshooting



Note

Note

6 Troubleshooting

This chapter gives advice on how to locate possible faults in the operation of theNokia MetroSite GSM BTS.

The commissioning related troubleshooting instructions are given in Nokia MetroSite GSM Base Station: Commissioning.

Detailed descriptions of BTS alarms are presented in Nokia MetroSite GSM BaseStation: Alarm Descriptions document.

Whenever any problems occur in the BTS operation, connect the manager PC to

the interface unit. The LED conditions and the alarm window usually indicatewhere/what the problem is. In order to obtain additional information on the BTSstatus, it is also advisable to be in contact with the BSC by a mobile phone.

Table 7. Troubleshooting

Symptom Possible fault Action

BTS is powered but the manager

connection cannot be established

1. Master TRX broken 1. Replace the master with one of

the slave TRXs and insert a new

TRX into the slave TRX’s slot.

Refer to Section 8.1.3.

2. Interface unit broken 2. Replace the interface unit.

3. Wrong manager port setting

(COM1, COM2)

3. Correct settings.

4. LMP cable broken or not

properly connected

4. Replace/repair the cable, or

check the connection.



Maintenance



No power to the BTS 1. Fault in the site mains power

supply

1. Check the site mains power

source and fuses. Replace if

necessary.

2. Broken power cable 2. Replace the cable.

3. Power supply unit broken 3. Replace the power supply unit.

4. Short circuit in one of the BTS

units

4. Pull the units out one by one

until the power comes back on.

Start from the TRXs and proceed

to the transmission unit, fan unit

and finally to the interface unit.

Return the units one by one and

replace the faulty unit(s).

5. Power supply unit switch in

stand-by position

5. Turn the switch to ON position

6. Cold start active 6. Wait until the units are warmed

up to the operational temperature

range and the power supply unit

LED turns green.

No transmission connection to

the BSC (yellow or red LED on

transmission unit)

1. Abis cable not connected 1. Check that the cable is

connected on the transmission unit

and at the BSC.

2. Abis cable broken 2. Repair the cable.

3. Line interface broken 3. Connect a jumper cable from

the TX connector of each

transmission interface to its RX

connector. If the green LED is lit

the line interface is OK. Otherwise,

change the transmission unit.

4. Transmission unit broken 4. Replace the transmission unit.

Transmission connection works

but there is a yellow LED lit on the

transmission unit

No real time from network to

transmission unit

Establish the BSC connection.

The device status report in the

BTS Manager indicates that the

BCCH TRX and a slave TRX are

in “Supervisory” state, but the

yellow LED blinks on both TRXs

Objects are locked from the BSC/

NMS

Request the state from the BSC/

NMS. Request an unlock from the

BSC/NMS if necessary.

Table 7. Troubleshooting (Continued)

Symptom Possible fault Action



Using Nokia BTS Manager



Note

7 Using Nokia BTS Manager

This chapter gives instructions on how to get started with the Nokia BTSManager. When replacing or adding units, the Nokia BTS Manager is used forlocal management of the BTS. It is assumed here that the user knows how to useWindows 95 or NT4.0 software.

7.1 Starting and exiting Nokia BTS Manager session

The installation program of the Manager SW creates a Nokia BTS Manager iconand defines its parameters.

Start the Nokia BTS Manager as follows:

1. Double-click the BTS Manager icon. Then, the Nokia BTS Manager startswith the Supervision and Alarms windows opened. Also, the softwarechecks the BTS configuration and displays it on the screen.

2. Enter the Manager password if the Manager password checking is on (thisis the case when you work in Windows 95 environment).

3. Enter the BTS password if the BTS password checking is on. The softwarecontinues execution only if the BTS accepts the entered password. Youmay enter an invalid password three times before the Nokia BTS Managerexits.

You can define different Manager options and communications parameters whenstarting to work with the Nokia BTS Manager.

The Nokia BTS Manager must be connected to the BTS in order to make the BTSpassword checking possible. If no connection exists, password checking is notapplicable.



Maintenance



To exit the Nokia BTS Manager, choose the EXIT command on the File menu.

7.2 Using HelpThe Nokia BTS Manager software has a convenient, context-sensitive on-lineHelp facility to look for information about a task you are going to perform, afeature you might want to know more about, or a command you may want to use.

To obtain help:

• Press F1

• Click the ‘Help’ command button on the toolbar

or,• Choose one of the Help menu commands

In the Help Topics window you can see a set of tabbed pages: Contents, Index andFind pages.

Contents

The Contents page displays a list of topics organized in books by category.

Index

The Index page lists keywords in alphabetical order through which differenttopics can be reached.

Find

The Find page provides a full-text search functionality that allows you to searchfor any word or phrase in the Help file.

To exit Help, press ESC or ALT+F4.



Replacing units



Caution

Caution

Note

8 Replacing units

This chapter describes how to replace plug-in units to the Nokia GSM MetroSiteBTS.

BSC and/or NMS personnel must be notified before starting to replace or addunits to the Nokia MetroSite GSM BTS.

Always use the antistatic wrist strap when handling the units.

Use the packing material of the new unit for sending the faulty unit to the service.



Maintenance



Caution

Note

Figure 4. Connecting the antistatic wrist strap.

Handle the units with care. Do not place the removed units so that their connectorsface the ground.

Figure 5 shows how the units are pulled out from the unit slots. Read the detailedstep instructions for each unit before pulling the units out.

If any of the units need to be removed or replaced, examine the retaining screws.If there are any traces of aluminium burrs on the thread, replace both the retainingclip and insert, as well as the retaining screw.

Spare counterparts for unit retaining screws can be found attached to theuppermost TRX guide beam on the top of the BTS (refer to Figure 5). Forreplacements of the units’ M3x16, T10 Torx mounting screws, contact your localNokia Customer Services.

ESD stud

to ESD studWrist strap



Replacing units



Note

Figure 5. Removing the units

The shield unit fixing screws may only be tightened to 1.0 Nm (0.74 ft-lb). Use atorque driver with a T10 Torx bit to tighten them.

8.1 Replacing TRXs

This section gives instructions on how to replace faulty TRXs. There are threedifferent cases as regards replacing the TRXs. The cases are the following:

Power supply unit

Interface unit

Transmission unit

Transceiver units

Spare counterpartsfor unit retaining screws



Maintenance



Caution

• Replacing a slave TRX

• Replacing the master TRX

• Replacing the TRX in a single TRX BTS

Furthermore, new TRXs can be added to the BTS (for more information refer toChapter 9 in this document).

8.1.1 TRX slots

The TRX in slot 1 is the master TRX of the Nokia MetroSite GSM BTS. Figure6 shows the order of the TRX slots.

Figure 6. TRX slot order

8.1.2 Replacing a slave TRX

Make sure the TRX that you are replacing is a slave TRX (slots 2, 3, or 4).

TRX3

TRX4

TR

X1

TR

X2



Replacing units



Note

To replace a slave TRX:

1. Block the TRX with Nokia BTS Manager (if the sector is not alreadylocked from the BSC).

2. Take note of the TRX cabling.

3. Disconnect the TRX cabling.

4. Open the TRX retaining screws of the unit with a T10 Torx driver. Loosenthe screw enough to remove the unit, but leave engaged on the threads of the unit screw hole.

5. Remove the TRX.

6. Unpack the new TRX.

7. Insert the TRX into the free slot.

8. Tighten the TRX retaining screws to 1.5 Nm (11.1 ft-lb) with a T10 Torxdriver.

9. Reconnect the TRX cabling.

10. Run the TRX test from the Nokia BTS Manager (optional).

11. Unblock the TRX with the Nokia BTS Manager and make BCF reset, or,if locked from the BSC NMS, unlock from the BSC/NMS (in this case thereset is automatic).

If the green LED is lit after the replacing procedure, the BTS is in service. If theLED is yellow or red, check the alarms and run the TRX test from the BSC/NMS.

8.1.3 Replacing the master TRX in BTS configurations with two or moreTRXs

If you want to run the TRX test locally, you must do this before unlocking the site.If you want to run the TRX test remotely, you must do this after unlocking thesite.



Maintenance



To replace the master TRX:

1. Block the sitelocally(BCF Block) usingthe NokiaBTSManagerif the siteis not already locked from the BSC/NMS.

2. Open the cable entry block.

3. Take note of the TRX cabling.

4. Disconnect the cabling from the faulty master TRX.

5. Disconnect the cabling from one of the slave TRXs

6. Open the master TRX retaining screws with Torx T10 driver. Loosen thescrew enough to remove the unit, but leave engaged on the threads of theunit screw hole.

7. Remove the master TRX.

8. Open the slave TRX retaining screws with Torx T10 driver.

9. Remove the uncabled slave TRX.

10. Insert the removed slave TRX to the slot of the master TRX and tighten theretaining screws with Torx T10 driver.

11. Insert a new TRX to the slot of the removed slave TRX and tighten theretaining screws with Torx T10 driver.

12. Recable the TRXs.

13. Close the cable entry block.

14. Inthe BTSManager, right-click the BCF object inthe Equipment viewandmake BCF Object Reset, or, if locked from the BSC NMS, request unlock from the BSC/NMS (in this case the reset is automatic).

If the green LED is lit after the replacing procedure the BTS is in service. If the

LED is yellow or red, check the alarms and run the TRX test from the BSC/NMS.



Replacing units



8.1.4 Replacing the master TRX in a single TRX BTS

To replace the master TRX

1. BlocktheBCF locally with NokiaBTSManager, orrequest BCF lockfromthe BSC/NMS.

2. If the manager connection can still be established, open the TrafficManager from the Transmission menu and export the TS allocationinformation to your PC hard disk.

3. Open the cable entry block.

4. Disconnect the TRX cabling.

5. Open the TRX retaining screws with a Torx T10 driver. Loosen the screwenough to remove the unit, but leave engaged on the threads of the unitscrew hole.

6. Remove the TRX.

7. Insert a new uncommissioned TRX into the slot of the master TRX.

8. Tighten the TRX retaining screws to 1.5 Nm (1.11 ft-lb) with Torx T10driver.

9. Recable the TRX.

10. Close the cable entry block.

11. Either import the TS allocation file from your PC hard disk or manuallyallocate the transmission capacity.

12. Inthe BTSManager,right-click the BCFobjectin the Equipment viewandmake BCF Object Reset, or, if locked from the BSC NMS, request unlock from the BSC/NMS (in this case the reset is automatic).

8.2 Replacing the transmission unit

This section instructs on how to replace a faulty transmission unit with a sametype of transmission unit (for example, FC E1/T1 with FC E1/T1).



Maintenance



Caution

Note

If the transmission unit to be replaced is FC RRI or FXC RRI, the BTS power

must be switched to the stand-by position from the switch on the BTS powersupply unit before disconnecting the Flexbus cable!

If the transmission unit to be replaced is FXC E1 or FC E1/T1, the outer conductof the 75 Ohm RX-connector can either be grounded capacitively or directly.When the metal bridge connecting the TX and RX connector is removed, thegrounding becomes capacitive.

To replace the transmission unit:

1. Verify the type of transmission unit. If the transmission unit is FXC E1 orFXC E1/T1 and the cross-connections have not been exported to a fileearlier, refer first to the procedure instructing the export of cross-connection information (immediately following this procedure).

2. Block the BCF locally with the Nokia BTS Manager or request BCF lock from the BSC.

3. Switch the BTS power supply unit to the stand-by position.

4. Disconnect the transmission unit cabling.

5. Open the upper and lower retaining screws of the unit with a T10 Torxdriver. Loosen the screw enough to remove the unit, but leave engaged onthe threads of the unit screw hole.

6. Remove the transmission unit. Pull the unit out from the front until the unitcomes to stop, then pull the unit out from the side. Refer to Figure 5.

7. Unpack the new transmission unit.

8. Insert the new transmission unit to the unit slot from the side of the cabinet.Push the unit towards the backplane. Do not use excessive force!

9. Tighten the upper and lower retaining screws to 1.5 Nm (1.11 ft-lb) with aT10 Torx driver.

10. Reconnect the unit cabling.



Replacing units



11. Switch the BTS power supply unit ON again.

12. If the transmission unit is FXC E1 or FXC E1/T1, refer to the procedureinstructing the import of cross-connection information.

13. Unblock the BCF with Nokia BTS Manager and make BCF reset, or, if locked from the BSC NMS, unlock from the BSC/NMS (in this case thereset is automatic).

14. Request the BSC/NMS to run the Abis loop test.

If the transmission unit is FXC E1 or FXC E1/T1, you can export the cross-connection information to a file before replacing the unit according to theprocedureabove.This wayyoucan import the cross-connection information fromthe file to the new unit.

To export cross-connection information to a file before replacing theFXC E1 or FXC E1/T1 unit:

1. Choose Open on the Transmission menu in the BTS Manager. The E1/T1Manager starts and connects to the transmission unit.

2. Choose View on the Cross-connections menu. The Cross-connectionsview opens on the screen.

3. Select the active bank.

4. Choose Export File on the File menu and specify a name and location forthe cross-connection file.

5. Quit E1/T1 Manager. The BTS Manager restarts automatically.

To import cross-connection information from a file after replacing theFXC E1 or FXC E1/T1 unit:

1. Choose Open on the Transmission menu in the BTS Manager. The E1/T1Manager starts and connects to the transmission unit.

2. Choose View on the Cross-connections menu. The Cross-connectionsview opens on the screen.

3. Select the inactive bank.

4. Choose Import File on the File menu and select the cross-connection file.



Maintenance



5. Choose Activate on the Cross-connections | Bank submenu.

6. Click OK in the Activate Bank dialogue box. Answer Yes when E1/T1Manager asks if you want to activate the inactive bank.

7. Quit E1/T1 Manager. The BTS Manager restarts automatically.

8.3 Replacing the interface unit

To replace the interface unit:

1. Block the BCF locally with the Nokia BTS Manager or request BCF lock from the BSC.

2. Switch the BTS power supply unit to the stand-by position.

3. Disconnect the unit cabling.

4. Loosen the upper and lower retaining screws of the unit with a T10 Torxdriver. Loosen the screw enough to remove the unit, but leave engaged onthe threads of the unit screw hole.

5. Remove the interface unit. Pull the unit out from the front until the unit

comes to stop, then pull the unit out from the side. Refer to Figure 5.

6. Unpack the new interface unit.

7. Insert the new interface unit to the unit slot from the side of the cabinet.Push the unit towards the backplane. Do not use excessive force!

8. Tighten the interface unitretaining screws to1.5Nm (1.11 ft-lb)witha T10Torx driver.

9. Reconnect the unit cabling.

10. Switch the BTS power supply unit ON again.

11. Inthe BTSManager, right-click the BCF object inthe Equipment viewandmake BCF Object Reset, or, if locked from the BSC NMS, request unlock from the BSC/NMS (in this case the reset is automatic).



Replacing units



WARNING

8.4 Replacing the power supply unit

Lethal voltages!

Turn the site mains power OFF before disconnecting the power supplycable!

To replace a power supply unit:

1. Turn the power feed to the BTS OFF from the main circuit breaker.

2. Open the power supply connector shield and the sealing pieces. Take noteof the cable routing through the sealing pieces.

3. Disconnect the mains power cable.

4. Loosen the power supply unit retaining screws with a T10 Torx driver.Loosen the screw enough to remove the unit, but leave engaged on thethreads of the unit screw hole.

5. Remove the power supply unit. Pull the unit out from the front until the unitcomes to stop, then pull the unit out from the side. Refer to Figure 5.

6. Unpack the new power supply unit.

7. Insert the new power supply unit to the unit slot from the side of thecabinet. Push the unit towards the backplane. Do not use excessive force!

8. Tighten the retaining screws to 1.5 Nm (1.11 ft-lb) with a T10 Torx driver.

9. Reconnect the power supply cable.

10. Turn the site mains power ON from the main circuit breaker.

11. Turn the BTS power supply unit ON.

8.5 Replacing the cooling fan assembly

Depending on the ambient temperature, the BTS can operate a short maintenancetime without the fan unit.



Maintenance



Note

Two cooling fan assemblies are available for the Nokia MetroSite GSM BTS, onefor the 1W TRXs BTS, the other for the 5W TRXs BTS.

Cooling fan assembly removal procedure:

The removal of the cooling fan assembly from the BTS cabinet is the same forboth the standard and the high capacity option.

1. Unlock and remove the BTS cabinet cover.

2. Remove the four Torx fan assembly mounting screws (see Figure 7 for thestandard version and Figure 8 for the high capacity version):

a. 3 x T10 on the R/H side of the assembly.

b. One T25 at the front of the assembly.

3. Slide the assembly to disconnect from the backplane receptor. Once clearof the guides, remove the assembly.

Figure 7. Low capacity cooling fan assembly and mounting screws

T10T25



Replacing units



Figure 8. High capacity cooling fan assembly and mounting screws

To install the assembly, follow the above procedure in the reverse order.

8.5.1 Replacing the standard cooling fan unit

Remove the fan unit at the bottom of the BTS cabinet by detaching the retainingscrew and sliding the unit out. Refer to Figure 9.

T10T25



Maintenance



Figure 9. Replacing the standard fan unit

8.5.2 Replacing the high capacity cooling fan unit

For an exploded view of the high capacity cooling fan assembly, refer to Figure10.

Detach

Torx T10

Attach

Torx T10

Guide

slot

2

31

Guide Guide

Guide

slot

2

1

3

1 Release the Torx head screw.

Slide sideways until the guidesat the fan unit reach the guideslots.

Remove the fan.

2

3

1 Position the guides at the fan unitto the guide slots.

Slide the fan unit sideways andpress against the sealingsurface

Fix the Torx head screw.

2

3

Sealingsurface



Replacing units



High capacity cooling fan unit removal procedure:

1. Remove the three M4 x 60 Torx screws from the fan unit (see Figure 10)to release the fan unit and the lower fan guard.

2. Remove the two 3 x 10 self tappers screws from the fan controller module(see Figure 10).

3. Remove the fan unit, the fan controller, and the lower fan guard.



Maintenance



Figure 10. High capacity fan assembly



Expanding the BTS capacity



Note

9 Expanding the BTS capacity

This section gives instructions on how to expand the capacity of the NokiaMetroSite GSM BTS.

The new TRX object must be created at the BSC/NMS before the new TRX canstart operation.

To add a new TRX:

1. Remove the shielding from the slot which is going to be populated with anew TRX. Use a Torx T10 driver to remove the retaining screws of theshielding unit.

2. Unpack the new TRX.

3. Insert the new TRX into the slot.

4. Open the Traffic Manager from the Nokia BTS Manager’s transmissionmenu.

5. Allocate transmission capacity to the new TRX.

6. Run the TRX test from Nokia BTS Manager (optional).

7. If any objects are locked, unlock them from the BSC/NMS.



Maintenance







Index

LEDs

fan unit 17

A

Abis loop test 14

adding TRXs 43

B

BTS Manager 25

C

capacity expansion 43

cooling fan assembly

replacing 37

E

electrostatic discharge (ESD) protection 27

environmental restrictions 9

exiting Nokia BTS Manager 25

expanding capacity 43

F

Failure Report Form 9

fan unitmaintenance 13

fan unit LED 17

fault reporting 9

H

Help, using 26

high capacity fan unit

replacing 40

I

interface unitreplacing 36

interface unit LED 16

L

LED indications 15

LEDs

interface unit 16

power supply unit 17

transceiver unit 15

transmission unit 15

lock lubrication 14

M

maintenance, periodic 13

Manager software 25

master TRX, replacing 32, 33

N

Nokia BTS Manager 25

O

on-line Help 26

P

power supply unit

replacing 37

power supply unit LED 17

R

removing the cover 10

replacing

cooling fan assembly 37high capacity fan unit 40

interface unit 36

power supply unit 37

standard fan unit 39

transmission unit 33

TRX units 29

replacing units 27

S

seal cleaning 14

site folder 9

slave TRX, replacing 30standard fan unit

replacing 39

starting Nokia BTS Manager 25

T

tests 14

transceiver unit (TRX)

replacing 29



Maintenance

replacing master TRX 32, 33

replacing slave TRX 30

transceiver unit LED 15

transmission unit

replacing 33transmission unit LED 15

troubleshooting 23

TRX slots 30

TRX test 14

U

units, replacing 27

Documents

Nokia MetroSite Base Station User Manual û Maintenance