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DRH
Hardware Maintenance Guide

4 Replacing a DRH

Issue 1.0(2013-04-10)

Huawei Proprietary and Confidential

Figure 4-2

Removing the metal sheet from a DRH installed in centralized mode

The subsequent operations are the same as those in the procedure for replacing a single DRH.

Step 8

Use an M6 inner hexagon torque wrench to loosen the captive screw on the attachment plate,
as shown in

Figure 4-3

, then raise the DRH bottom to remove it, as shown in

Figure 4-4

In scenarios where DRHs are installed in centralized mode, the DRH in the middle can be removed
without removing the two DRHs on its right and left sides. The procedure is identical to the procedure
for removing a single DRH.

Summary of Contents for DRH

Page 1: ...DRH Hardware Maintenance Guide Issue 1 0 Date 2013 04 10 HUAWEI TECHNOLOGIES CO LTD ...

Page 2: ...he customer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subjec...

Page 3: ...nce This document is intended for System engineers Site maintenance engineers Organization 1 Changes in the DRH Hardware Maintenance Guide This chapter describes the changes in the DRH Hardware Maintenance Guide 2 Preventative Maintenance Items for a DRH Preventative maintenance improves the reliability of the DRH You are advised to perform scheduled maintenance yearly 3 Powering On and Off a DRH ...

Page 4: ...Huawei Technologies Co Ltd iii An optical module implements optical electrical conversion enabling optical transmission between a DRH and other devices You must disconnect optical fibers from an optical module before replacing the optical module Disconnecting the optical fibers interrupts the transmission of CPRI signals ...

Page 5: ...Confidential Copyright Huawei Technologies Co Ltd iv Contents 1 Changes in the DRH Hardware Maintenance Guide 1 2 Preventative Maintenance Items for a DRH 2 3 Powering On and Off a DRH 4 3 1 Powering On a DRH 4 3 2 Powering Off a DRH 5 4 Replacing a DRH 6 5 Replacing an Optical Module 11 ...

Page 6: ... 2013 04 10 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 1 1 Changes in the DRH Hardware Maintenance Guide This chapter describes the changes in the DRH Hardware Maintenance Guide Date Issue Description Author 2013 04 10 V1 0 First release ID h00173116 z00138293 ...

Page 7: ...trongly recommended Table 2 1 lists the preventative maintenance items for a DRH Table 2 1 Preventative maintenance items for a DRH No Item 1 All DRHs are properly installed and in good condition 2 The cable seals at the entry points of the cabinet are in good condition 3 All RF cables are free from wear cuts cracks or other damage 4 All RF cable connectors are sealed properly 5 All RF cable condu...

Page 8: ...Item 13 All alarm cables optional are installed and free from any damage 14 All monitoring cables optional are installed and free from any damage If any of the requirements in the checklist is not met perform the following corrective actions 1 Tighten all connections 2 Report the problems to the supervisor so that the qualified engineers can be assigned to maintain the DRH ...

Page 9: ...ites The DRH hardware is installed and DRH cable connections are secure The input voltage of a DC DRH ranges from 36 V DC to 57 V DC The input voltage of an AC DRH ranges from 90V AC to 290 V AC Context After you unpack a DRH you must power on it within 24 hours If you power off the DRH for maintenance you must restore power to the DRH within 24 hours Procedure Step 1 To power on the DRH set the c...

Page 10: ...ormal situation such as moving the equipment or anticipating a territorial blackout You must also power off the DRH in an emergency such as a fire smoke or water damage Procedure To perform a normal power off perform the following steps If DRHs are cascaded consider the impacts of power off operations on lower level DRHs to prevent service interruption Step 1 Set the corresponding circuit breaker ...

Page 11: ...he WebLMT or M2000 and run the MML command to query the manufacturing information of the DRHs The types of DRHs to be replaced can be determined according to the values of Type and Description in the command execution result Run the DSP BRDMFRINFO command Tools and materials such as ESD gloves M5 Phillips screwdrivers M6 Phillips screwdrivers M6 inner hexagon torque wrench waterproof tape and PVC ...

Page 12: ...e DRH by referring to 3 2 Powering Off a DRH Step 3 Wear ESD gloves Take proper ESD protection measures for example wear ESD gloves to prevent electrostatic damage to the boards modules or electronic components Step 4 Loosen the screws on the cover plate of the DRH cabling cavity using an M5 Phillips screwdriver and then open the cover plate Step 5 Record all the cable connections on the panel of ...

Page 13: ...me as those in the procedure for replacing a single DRH Step 8 Use an M6 inner hexagon torque wrench to loosen the captive screw on the attachment plate as shown in Figure 4 3 then raise the DRH bottom to remove it as shown in Figure 4 4 In scenarios where DRHs are installed in centralized mode the DRH in the middle can be removed without removing the two DRHs on its right and left sides The proce...

Page 14: ...ance Guide 4 Replacing a DRH Issue 1 0 2013 04 10 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 9 Figure 4 3 Loosening captive screws on the attachment plate Figure 4 4 Supporting the DRH bottom ...

Page 15: ...g cavity using an M5 Phillips screwdriver Step 12 Power on the DRH by referring to 3 1 Powering On a DRH Step 13 Check the operating status of the new DRH by observing the status of DRH indicators When the RFU is normal the RUN indicator is blinking for 1s on and 1s off Step 14 Instruct the WebLMT or M2000 administrator to unblock the DRH Run the LST IBSLOCELL command to list all cells on the DRH ...

Page 16: ...in the query result and obtain an optical module of the same type Figure 5 1 shows the label on the optical module Figure 5 1 Label on the optical module 1 Peak rate 2 Wavelength 3 Transmission mode If the software version does not support query of the type of the optical module by using an MML command obtain all types of optical modules If a fault in the optical module on the DRH side causes disc...

Page 17: ...remove the connector from the faulty optical module Do not look into the optical fiber or optical module without eye protection after the optical fiber is removed from the optical module Step 5 Lower the puller on the faulty optical module and then pull the puller until the optical module is removed from the DRH Step 6 Choose the optical module of the same type as the faulty optical module accordi...

Page 18: ...Technologies Co Ltd 13 Follow up Procedure Place the replaced optical module into the ESD box or bag Then place the ESD box or bag into a foam padded carton or the packing box of the new module Fill in the fault form with detailed information about the replaced module Contact the local Huawei office to handle the faulty optical module ...

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