Nokia MetroSite EDGE Base Station Maintenance DN9913495 Issue 3-0 en © Nokia Corporation Nokia Proprietary and Confidential Draft 1 (52)
Maintenance The information in this documentation is subject to change without notice and describes only the product defined in the introduction of this documentation. This documentation is intended for the use of Nokia's customers only for the purposes of the agreement under which the documentation is submitted, and no part of it may be reproduced or transmitted in any form or means without the prior written permission of Nokia.
0523 FCC Hereby, Nokia Corporation, declares that this product is in compliance with the essential requirements and other relevant provisions of Directive: 1999/5/EC. The product is marked with the CE marking and Notified Body number according to the Directive 1999/5/EC. FCC §15.21 - Information to user - This product is used as an intentional radiated equipment and any changes or modifications on the equipment without any approval by Nokia could void the user's authority to operate the equipment. FCC §15.
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Contents Contents 5 List of tables 7 List of figures 8 1 About this document 11 2 2.1 2.1.1 2.2 2.2.1 2.3 2.4 2.5 Preparations for maintenance 13 Site folder 13 Fault reporting 13 Maintenance equipment 13 Nokia BTS Manager 14 Environmental precautions 14 Power supply precautions 14 Removing the BTS cover 15 3 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.
Maintenance 7 7.1 7.2 7.3 7.4 7.
List of tables Table 1. Power supply rules during maintenance procedures Table 2. Troubleshooting checklist Table 3. LED conditions for TRX units Table 4. LED conditions for a transmission unit Table 5. LED conditions for an RRI transmission unit’s Flexbus LED. Table 6. LED conditions for an interface unit Table 7. LED conditions of the power supply unit Table 8.
Maintenance List of figures Figure 1. Safety strap on the MetroSite EDGE BTS cover 16 Figure 2. 13 MHz clock adjustment 20 Figure 3. Clock control window - coarse adjustment 21 Figure 4. Fine adjustment of the DAC value 22 Figure 5. Electro-static sensitive device symbol 27 Figure 6. Connecting the antistatic wrist strap. 28 Figure 7. Removing the units 29 Figure 8. TRX slot numbering 31 Figure 9.
Summary of changes Version 1, 12th November 1999.
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About this document 1 About this document This document gives instructions on the maintenance of the Nokia MetroSiteTM EDGE Base Station (BTS). Read carefully Nokia MetroSite EDGE Base Station: Warnings and Cautions before starting the maintenance work.
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Preparations for maintenance 2 Preparations for maintenance This chapter describes the issues that must be considered in the maintenance of the Nokia MetroSite EDGE BTS. 2.1 Site folder A site folder contains site-specific information required on the site. The site folders include installation, commissioning, and integration check lists. The exact contents of the site folders are defined by the customer. It is the responsibility of the customer to maintain and archive site-specific documents. 2.1.
Maintenance 2.2.1 Nokia BTS Manager When replacing or adding units, Nokia BTS Manager software is used for local management of the BTS. Instructions for running specific maintenance operations with Nokia BTS Manager are included in the relevant sections of this document. For more general information on using Nokia BTS Manager, refer to Nokia MetroSite EDGE Base Station: Commissioning. 2.
Preparations for maintenance Table 1.
Maintenance 2. Remove the cover by sliding it upwards to disengage the hooks at the side of the cover from the locking guides on the BTS chassis. 3. When the cover is free, pull it away from the cabinet and hang it on the hook at the top left side of the chassis. You can also remove the cover completely to place it on the floor. Remove the safety strap before pulling the cover away (see Figure 1). Fixing point for safety strap under the cover top Figure 1.
Periodic maintenance 3 Periodic maintenance This chapter describes the periodic maintenance of the MetroSite EDGE Base Station. 3.1 Maintaining the cabinet 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. To maintain proper circulation of air through the cabinet, air inlets and outlets must not be obstructed. 3.1.2 Cover Clean the BTS cover of stains and dust whenever necessary.
Maintenance 3.1.3 Seals Wipe the BTS seals (seal on the lower edge of the BTS, under the cover) whenever they are dirty. The cleaning interval depends on the environment. Check the visible seals during every site visit. If the seals are dirty, wipe them clean with a piece of cloth. Replace worn or broken seals. 3.1.4 Lock Lubricate the lock during site visits with lubricating oil.
Adjusting the 13 MHz clock 4 Adjusting the 13 MHz clock The 13 MHz clock is adjusted using the Nokia BTS Manager PC and a frequency counter. The 13 MHz clock should only need adjusting after a new installation or when the interface unit (VIFA) is replaced. Note Before commencing the adjustment procedure, switch ON the frequency counter and allow for a stabilising time of about 15 minutes, or as recommended by the instrument’s manufacturer. Use only a high stability frequency counter for this procedure.
Maintenance VIFA Unit X7 LMP Frequency counter Laptop fitted with Nokia BTS Manager Figure 2. 20 (52) 13 MHz clock adjustment 4. Open Nokia BTS Manager on your laptop PC. 5. Open the calibration menu by selecting OBJECTS on the BTS Manager main menu. 6. Select CLOCK CONTROL from the drop-down menu. 7. In the Clock Control window, enter a DAC (digital-to-analogue converter) value which will tune the clock to 13 MHz (±1 Hz).
Adjusting the 13 MHz clock Change the DAC value with the slider or by typing the DAC value directly in the box (see Figure 3). Note To increase the frequency, increase the DAC value. The range of DAC values is from 0 to 4095, providing an adjustment of ±25 Hz. Figure 3. Clock control window - coarse adjustment Fine adjustment of the DAC value slider is achieved by clicking the ‘Use Fine Scale’ check box in the Clock Control window (see Figure 4).
Maintenance Figure 4. 8. Fine adjustment of the DAC value Save the DAC value by clicking the SAVE CURRENT PERMANENTLY button in the Clock Control window. Click the CLOSE button or press Enter on your keyboard. Saving the DAC value permanently will ensure that it remains in the clock memory after reset. 9. 22 (52) When asked if you want to continue, select YES in the dialogue box.
Troubleshooting 5 Troubleshooting This chapter gives advice on how to identify and rectify possible faults in the operation of the Nokia MetroSite EDGE Base Station. Note Troubleshooting instructions related to BTS commissioning are given in Nokia MetroSite EDGE Base Station: Commissioning. Note Detailed descriptions of BTS alarms are presented in Nokia MetroSite EDGE Base Station: Alarm Descriptions. Descriptions of the LED unit status indicators are presented in Chapter 7 of this document.
Maintenance 5.2 Troubleshooting checklist Table 2. Troubleshooting checklist Symptom Possible fault Action BTS is powered ON but the BTS Manager connection cannot be established. 1. Master TRX broken. 1. Replace the master TRX with one of the slave TRXs and insert a new TRX into the slave TRX’s slot. Refer to Section 6.4.3. 2. Interface unit broken. 2. Replace the interface unit. 3. Wrong BTS Manager port setting (COM 1, COM 2). 3. Correct the COM port settings. 4.
Troubleshooting Table 2. DN9913495 Issue 3-0 en Troubleshooting checklist (Continued) Symptom Possible fault Action No transmission connection to the BSC (yellow or red LED on transmission unit). 1. Abis cable not connected or connected incorrectly. 1. Check that the cable is connected on the transmission unit and at the BSC. Check that the RX and TX cables are connected to the correct connectors. 2. Abis cable broken. 2. Replace the cable. 3. Line interface broken. 3.
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Replacing units 6 Replacing units This chapter describes how to replace plug-in units in the Nokia MetroSite EDGE Base Station. Caution BSC and/or NMS personnel must be notified before starting to replace or add units to the Nokia MetroSite EDGE Base Station. 6.1 ESD protection Caution Some units in the MetroSite BTS contain electro-static sensitive devices. The BTS is labelled with an electro-static sensitive device symbol as shown in Figure 5.
Maintenance Wrist strap to ESD stud ESD stud Figure 6. 6.2 Connecting the antistatic wrist strap. Removing units Figure 7 shows how the units are pulled out from the unit slots. Read the detailed step instructions for each unit before pulling the units out. If you are replacing BTS units, keep the units protected in their delivery packages until they are needed. After installation, keep some of the packaging material for packing the removed units when sending them for service.
Replacing units Spare counterparts for unit retaining screws Power supply unit Transceiver units Interface unit Transmission unit Figure 7. Removing the units Note Examine the retaining screws when replacing units. If there are any traces of aluminium burrs on the thread, replace the screw. Spare counterparts for unit retaining screws can be found attached to the uppermost TRX guide beam on the top of the BTS (see Figure 7).
Maintenance Note The shield unit fixing screws may only be tightened to 1.0 Nm (0.74 lb ft). Use a torque driver with a T10 Torx bit to tighten them. 6.3 Recycling of units In case you need to dispose of the units or the whole BTS, contact Nokia Professional Services for information on recycling. An environmental data package, including disassembly instructions and a material balance document is also available via Nokia Professional Services. 6.
Replacing units T R X 3 T R X 4 T R X 1 T R X 2 Figure 8. 6.4.2 TRX slot numbering Replacing a slave TRX Caution Make sure the TRX that you are replacing is a slave TRX (slots 2, 3, or 4). Replacing a slave TRX DN9913495 Issue 3-0 en 1. Connect your Nokia BTS Manager PC to the LMP connector on the interface unit. 2. Block the TRX using Nokia BTS Manager (if the sector is not already locked from the BSC).
Maintenance Figure 9. Example Object Properties window in Nokia BTS Manager (can be used for blocking a TRX) 3. Make a note of the TRX cabling. 4. Disconnect the TRX cabling. 5. Undo the retaining screws of the TRX unit with a T10 Torx driver. Loosen the screws enough to remove the unit, but leave them engaged in the thread to allow easy refitting. 6. Remove the TRX. 7. Unpack the new TRX. 8. Insert the TRX into the free slot. 9. Tighten the TRX retaining screws to 1.5 Nm (11.
Replacing units 6.4.3 Replacing the master TRX in BTS configurations with two or more TRXs Note 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 the site. Replacing the master TRX DN9913495 Issue 3-0 en 1. Connect your Nokia BTS Manager PC to the LMP connector on the interface unit. 2.
Maintenance 16. With Nokia BTS Manager, right-click the BCF object in the Equipment View window and carry out a BCF Object Reset, or, if locked from the BSC/NMS, request an unlock from the BSC/NMS (the BCF reset is automatic in this case). If the green LED is lit on the TRX after the replacement 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. 6.4.
Replacing units 14. Either import the TS allocation file from your PC hard disk or manually allocate the transmission capacity. 15. With Nokia BTS Manager, right-click the BCF object in the Equipment View window and carry out a BCF Object Reset, or, if locked from the BSC/NMS, request an unlock from the BSC/NMS (the BCF reset is automatic in this case). If the green LED is lit on the TRX after the replacement procedure, the BTS is in service.
Maintenance 3. Block the BCF locally from Nokia BTS Manager or request a BCF lock from the BSC. 4. Switch the BTS power supply unit to the stand-by position. 5. Disconnect the transmission unit cabling. Note If the cables have not been labelled, make a note of which cable is TX and which cable is RX before disconnecting them. 36 (52) 6. Open the upper and lower retaining screws of the unit with a T10 Torx driver.
Replacing units Exporting cross-connection information to a file before replacing an FXC E1 or FXC E1/T1 unit 1. Select TRANSMISSION | OPEN from the main menu in Nokia BTS Manager. BTS Manager closes and the E1/T1 Manager (Transmission Unit Manager) application starts and connects to the transmission unit. 2. Select CONFIGURATION | CROSS-CONNECTIONS from the main menu. The Cross-connections window opens. 3. Select the active bank. 4.
Maintenance 6.6 Replacing the interface unit Replacing the interface unit 38 (52) 1. Connect your Nokia BTS Manager PC to the LMP connector on the interface unit. 2. Block the BCF locally with the Nokia BTS Manager or request a BCF lock from the BSC. 3. Switch the BTS power supply unit to the stand-by position. 4. Disconnect the interface unit’s cabling, including the BTS Manager connection. 5. Open the upper and lower retaining screws of the unit with a T10 Torx driver.
Replacing units 6.7 Replacing the power supply unit WARNING Lethal voltages! Turn the site mains power OFF before disconnecting the power supply cable! Replacing the power supply unit (PSU) DN9913495 Issue 3-0 en 1. Turn the power feed to the BTS OFF at the main circuit breaker. 2. Open the power supply connector shield and the sealing pieces. 3. Disconnect the power cable from the connector on the PSU. 4. Open the upper and lower retaining screws of the unit with a T10 Torx driver.
Maintenance 6.8 Replacing the cooling fan The fan unit and its controller module are inside the fan mounting assembly on the bottom of the BTS cabinet. For maintenance, the fan unit and controller module can be removed and replaced in the mounting assembly. The procedures for doing this are given here. Alternatively, the complete fan assembly can be removed and replaced. The procedures for doing this are given in the document Nokia MetroSite EDGE Base Station: Field Upgrade.
Replacing units 2. Unclip and slide the cable cover towards you. 3. Disengage and remove the cable cover support plate. 4. Remove all connecting cables to the units. If necessary, make a note of the cable connections before removing them. Note All connecting cables must be removed in order to remove the fan mounting assembly. 5. Detach the outer sealing gasket at the point where it covers the cable entry block, see (A) in Figure 10. 6. Remove the two 4 mm (0.
Maintenance Replacing the HVMF fan, version 1 1. Remove the fan mounting assembly from the cabinet, as follows: 1. Remove the three T10 Torx screws and one T25 Torx screw from the right hand side of the mounting assembly. See Figure 11. 2. Slide the mounting assembly sideways and disconnect the fan unit’s connector from the backplane. 2. Remove the three M4 x 60 Torx screws from the fan unit (see Figure 12) to release the fan unit and the lower fan guard. 3.
Replacing units Figure 12.
Maintenance 6.8.2 Replacing the HVMF cooling fan, version 2 BTS installations fitted with version 2 of the HVMF fan assembly can be removed without removing the complete fan assembly mounting. The screws retaining the fan unit and controller module can be reached from the underside of the BTS. Compare Figure 13 with Figure 12.
Replacing units 4 3 5 6 2 DN0186406 1 Legend: 1 2 3 4 5 6 Figure 13.
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LED indicator conditions 7 LED indicator conditions In addition to the alarms a network element can produce, most functional units also have three-colour LED indicators. These indicators display the current state of the equipment for quick, on-site reference.
Maintenance 7.2 Transmission unit LED The conditions for the transmission unit’s LED indicators are specified in Table 4. Table 4.
LED indicator conditions Table 6. 7.4 LED conditions for an interface unit LED colour Indication Green OCXO operating Yellow OCXO warming up Red OCXO broken Power supply unit LED The condition of the power supply unit’s LED indicators are specified in Table 7. Table 7. LED conditions of the power supply unit LED colour Condition Green Unit operating Yellow 1. Output voltage OK, switch on the power supply unit is in the ON position, BTS in cold start mode 2.
Maintenance Table 8.
Index A Abis loop test 18, 23 adjusting the 13 MHz clock antistatic wrist strap 27 transmission unit lock lubrication 18 19 14 34 N C cooling fan replacing M maintenance, periodic 17 Manager software 14 master TRX, replacing 33, B BTS Manager 48 Nokia BTS Manager 40 P D disposal of units 14 power supply precautions power supply unit LED 49 replacing 39 30 14 E environmental data package 30 environmental precautions 14 R H recycling 28 removing the cover 15 replacing cooling fan 40 HVMF fa
Maintenance TRX slots 30 TRX test 18, 23 U units, replacing 52 (52) 27 © Nokia Corporation Nokia Proprietary and Confidential Draft DN9913495 Issue 3-0 en
