Guide to High-Risk Operations on the UMG8900

Guide to High-Risk Operations on the UMG8900

UMG8900

Issue 1.00

Date 2010-03-30

INTERNAL

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. Please feel free to contact our local office or company headquarters.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute the warranty of any kind, express or implied.

mailto:[email protected]

http://www.huawei.com/

UMG8900 Guide to High-Risk Operations on the UMG8900 About This Document

About This Document

Author

Prepared by Chen Deming Date 2010-03-30

Reviewed by Xiao Zhenhua, Yan Yushuang Date

Approved by Date

OverviewThis document describes risk assessment about major operations in WCDMA-CS. Major operations are categorized into maintenance related operations and command related operations. This document provides possible impacts of various operations, prompting you to perform correct operations and reduce faults caused by improper operations.

Read this document before maintenance operations on the UMG89000. The following chapters are descrebed in this document.

Chapter Description

3 High-Risk Operations This chapter describes the risks of major operations on the UMG8900 and provides instructions for these operations.

4 Commands to Be Used with Caution

This chapter describes the commands that should be used with caution or are prohibited during the operation and maintenance of the UMG8900.

Change History

Document Version

Description Delivery Date

Prepared by

Approved by

1.00 Initial release. 2010-04-10 Chen Deming

Issue 1.00 (2010-03-30)Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co.,Ltd

v

About This DocumentUMG8900


viHuawei Proprietary and Confidential


Issue 1.00 (2010-03-30)

UMG8900 Guide to High-Risk Operations on the UMG8900 Figures

Contents

1 User Guide.................................................................................1-1

2 Precautions for High-Risk Operations..........................................2-12.1 Operation Preparations...................................................................................................................................2-1

2.1.1 Designing an Operation Scheme...........................................................................................................2-1

2.1.2 Operation Procedure..............................................................................................................................2-1

2.2 Operation Implementation..............................................................................................................................2-1

2.3 Watching after the Operation..........................................................................................................................2-2

3 High-Risk Operations..................................................................3-13.1 Introduction....................................................................................................................................................3-1

3.2 ESD Prevention..............................................................................................................................................3-1

3.3 Board Switchover...........................................................................................................................................3-2

3.3.1 Precautions............................................................................................................................................3-3

3.3.2 Operation Procedure..............................................................................................................................3-3

3.3.3 Inspection after the Operation...............................................................................................................3-4

3.4 Board Replacement........................................................................................................................................3-4

3.4.1 Board Removal......................................................................................................................................3-5

3.4.2 Board Installation..................................................................................................................................3-6

3.5 Cutting Off the Air Circuit Breaker on the Power Distribution Frame..........................................................3-8

3.6 Replacement/Removal of Fan Frames............................................................................................................3-8

3.7 Operations for Power Cable Connection........................................................................................................3-9

3.8 Capacity Expansion for Service Frame..........................................................................................................3-9

3.9 Connecting Network Cables to an LSW/Router..........................................................................................3-10

3.10 Adjusting the LSW Configuration..............................................................................................................3-11

3.11 Version Upgrade..........................................................................................................................................3-11

3.12 Activating/Deactivating Patches.................................................................................................................3-12

3.13 System Time Adjustment............................................................................................................................3-13

3.14 Clock Adjustment.......................................................................................................................................3-13

4 Commands to Be Used with Caution.............................................4-14.1 Commands that Are Forbidden or Must Be Used with Caution.....................................................................4-1



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UMG8900 Guide to High-Risk Operations on the UMG8900 Figures

Figures

Figure 3-1 Wearing an ESD-preventive wrist strap.............................................................................................3-2

Figure 3-2 Position of a board in the frame.........................................................................................................3-5

Figure 3-3 Board removal procedure...................................................................................................................3-6

Figure 3-4 Board installation procedure..............................................................................................................3-7



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UMG8900 Guide to High-Risk Operations on the UMG8900 3 High-Risk Operations

1 User Guide

This document provides risky operations that may lead to faults during routine maintenance and fault handling according to analysis of previous faults in the devices running on existing networks. As far as operations in this document are concerned, you must strictly follow the instructions described here; otherwise, the risky operations may lead to faults with serious consequences.

The risk grades are as follows:

★★★★★ indicates that the operation may lead to a fault of level 2 or above.

★★★★ indicates that the operation may lead to a fault of level 3 or above.

★★★ indicates that the operation may lead to a fault of level 4 or above.

★★ indicates that the operation may lead to a fault or interrupt services.



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2 Precautions for High-Risk

Operations

2.1 Operation Preparations

2.1.1 Designing an Operation SchemeBefore performing any high-risk operation, design a detailed operation scheme.

In addition to a detailed operation procedure, an operation scheme must include the following points:

1. Inspection and verification methods after operation.

2. Rollback conditions for an operation failure and detailed operation procedure of rollback.

3. Watching plan and monitoring scheme after successful operation.

2.1.2 Operation ProcedureAll high-risk operations must comply with the change flow. An operation scheme should be submitted to the relevant expert group for review, and can be executed only after the scheme is approved.

Before performing a high-risk operation, file a formal application to the customer and inform the customer of the detailed operation scheme and implementation plan. In addition, inform the customer of potential risks and preventative measures in advance, and request the customer to assign personnel for cooperation.

2.2 Operation ImplementationFollow the approved operation scheme and perform the operation in the customer-specified duration or the period (00:00 a.m. to 06:00 a.m.) when the traffic volume is commonly believed to be low.

During the operation, monitor the duration of each phase in the operation and ensure that the operation and service test can be complete within the specified period.



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3 High-Risk OperationsUMG8900


During the operation implementation, closely watch the running status of the system and generated alarms. Detect exceptions and handle them in time.

If the operation fails to be implemented within the specified period, roll the operation back according to the rollback scheme and operation sequence designed at the preparation stage. In addition, perform an acceptance test after the operation rollback.

2.3 Watching after the OperationAfter a high-risk operation, perform complete service tests to ensure that the device runs normally.

Assign personnel to closely watch the running status of the device and network performance for two days after the operation to detect and handle problems immediately.

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3 High-Risk Operations

3.1 IntroductionThis chapter describes the precautions for board replacement:

Electrostatic discharge (ESD) prevention

Board switchover

Board removal

Board insertion

3.2 ESD Prevention 1. Ensure that the device and floor are properly grounded.

2. Take dustproof measures in the equipment room.

3. Ensure that the temperature and humidity in the equipment room are proper.

4. Before touching a board, wear an ESD-preventive wrist strap and ESD-preventive coat. Before installing a part of the platform, especially a board, wear an ESD-preventive wrist strap.

5. When handling a board, hold the board edge without touching the components or printed circuits on the board.

6. Avoid touching the board with other articles, for example, your clothes. This is because the ESD-preventive wrist strap can prevent only the electrostatic generated on your body rather than on your clothes from damaging the board.



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Wear an ESD-preventive wrist strap and connect it to the ESD jack in the cabinet to ground the wrist strap properly. See Figure 3-1.

Figure 3-1 Wearing an ESD-preventive wrist strap

CAUTIONAvoid touching the board with any part of your body except your hands.

3.3 Board Switchover[Risk level]

★★★★

[Operation risk]

Misoperation leads to board malfunction.

The switchover operation has an impact on the entire service.

[Mitigation procedure]



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1. Before switchover or reset, check that the master/slave switchover is complete.

2. Switch over or reset only one board at one time.

3. Check that the slave boards works normally before switchover.

4. After switchover or reset, check that the system runs properly.

3.3.1 Precautions Take caution when you perform switchover. Note the following points:

1. You can perform switchover only when the conditions are met. For example, the slave board works normally. Frequent switchover is prohibited.

2. When a board of the system is in the switchover progress, you cannot switch over or replace another board.

3. The switchover operation should be performed when the traffic is low. This is to prevent call interruption and impact to service.

4. When certain boards are switcher over, the accuracy of traffic statistics for measurement units associated with the boards in the statistics collection period may be affected.

5. This operation has certain risks; thus, the operator must be familiar with the device and understand the link status in each office direction. This operation can be performed only when both the master and slave boards run properly. Before performing this operation, obtain approval from Huawei technical support personnel.

6. Switch over the MOMU with caution.

7. The CLK board can be switched over only when the clock of the master board is synchronous with that of the slave board and when its slave board is in the tracking, free, or hold state.

8. The below table lists the boards that can be switched over.

Operation Guide Criteria

You can run the SWP BRD command to switch over the following boards that work in 1+1 backup mode:

OMU

MPU

NET

RPU

TNU

CMU

CLK

BLU

ASU

You can see that the master board resets.

The former master board acts as the slave boards, and the former slave board acts as the master board.

The system runs properly after the switchover.

During board switchover, the system generates alarms.

3.3.2 Operation ProcedureStep 1 Run the SWP BRD command to perform switchover.

1. Run the DSP BRD command to check whether the backup for the board to be switched over is complete. If not, wait for the completion of the backup.



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2. Run the DSP BRDVER command to check whether the version of the board to be switched over is consistent with the version of the slave board. If not, take measures to ensure the version consistency.

3. Run the DSP PATCH command to check whether the patches on the board to be switched over are consistent with those on the slave board. If not, take measures to ensure the patch consistency.

4. Run the LST BRDSTART command to check the loading mode of the master board to be switched over. If the loading mode is not FLASH, run the SET BRDSTART command to change the loading mode into FLASH.

5. Run the SWP BRD command and input the frame ID, slot ID, and front and rear location parameters of the master board to be switched over before performing the switchover.

6. If the switchover fails, contact Huawei technical support.

Step 2 Switch over the board directly through the control panel of the device.

1. Select Device Panel and click Device Management. Choose the cabinet and frame where the board is located to find the board to be switched over.

2. Query and modify the board backup status, board version, patch status, and loading mode. Ensure that the switchover conditions are met.

3. Then, switch over the board. The subsequent operations are the same as those in method 1.

----End

3.3.3 Inspection after the Operation [Inspection after the major operation]

1. Check whether all new alarms in the alarm subsystem are cleared.

2. Run the DSP BRD command to check whether the new master board runs normally after the switchover.

3. Run the DSP command to check whether H.248/M2UA/M3UA links and circuits are normal.

4. Query call logs and check whether call loss occurs after the switchover.

5. Check whether the traffic statistics about the call completion ratio in each office direction on the softswitch are normal.

6. Perform complete service test to ensure that the service is normal.

7. If exceptions are found in any of the preceding inspection, contact Huawei technical support immediately.

3.4 Board Replacement[Risk level]

★★★★

[Operation risk]

When you replace a board, take great caution because this operation may cause large-scale service interruption or system power-off. Note the following points during operation:



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1. Ensure that the slave board for the board to be removed works normally.

2. Do not touch the other boards. Otherwise, they may be powered off.

Perform this operation under the guide to board replacement in the product manual.

Properly wear an ESD-preventive wrist strap and gloves. In addition, connect the grounding terminal to the ESD jack in the cabinet. Ensure that the ESD-preventive wrist strap is properly grounded.

[Mitigation measure]

Note the following points:

− Only a slave board can be removed. To remove an master board, switch it over to the slave one first.

− Avoid touching the other boards. Otherwise, they may be powered off.

− Do not introduce or cut off any connection line.

Removal of a master board:

− When a normally-operating slave board and a bridge board are in position:

(1) Switch over the board to the slave status manually.

(2) When the former slave board acts as the master one and works normally, you can remove the former master board.

− When a normally-operating slave board and a bridge board are both unavailable:

− (1) Do not remove the board; otherwise, the system is powered off.

3.4.1 Board RemovalFigure 3-1 shows the position of a board in the frame.

Figure 3-1 Position of a board in the frame

The board removal procedure is as follows:

1. Unscrew the board with a cross screwdriver and check that the screws are detached from the frame. See part a in Figure 3-1.

2. Pull the two ejector handles outwards concurrently. See part b in Figure 3-1. In this manner, the board is detached away from the base board. See part c in Figure 3-1.



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3. Pull the board panel with one hand and hold the board bottom with the other hand. Observe the OFFLINE indicator below the ejectors. When this indicator is on, you can detach the board from the base board. See part d in Figure 3-1.

After pulling the two ejectors handles outwards, you can remove the board only when the OFFLINE indicator is on. Otherwise, the board removal may cause device damage.

After a board is removed, you can power it on only when it is inserted again.

Before removing an OMU, reset it. Removing an OMU before the OFFLINE indicator is on can damage the BAM file. Follow the standard operation procedure.

4. Check the name of the new board. If a faulty board is replaced, set the DIP switch and jumper on the new board based on the setting of the DIP switch and jumper on the replaced board.

5. Place the replaced board in an ESD-preventive box or bag.

Figure 3-1 Board removal procedure

(a) (b) (c) (d)

3.4.2 Board Installation

Operation Procedure

Figure 3-1 shows the procedure for inserting a new board. Do as follows:

1. Take out the new board from the ESD-preventive box or bag and check whether the board is damaged and whether any component is missing. Avoid touching the board and components when handling the board.

2. Hold the board panel with one hand and hold the board from the bottom with the other hand. Insert the board into the frame along the guide rail. Ensure that the board is inserted in the correct direction. In addition, check that the ejector is in the position as shown in part a in Figure 3-1. Then, push the board panel with proper force as shown in part a in Figure 3-1.



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3. Push the two ejector handles inwards concurrently and quickly as shown in part b in Figure 3-1 so that the ejector handle hooks the hole in the mount bar. In this manner, the board is tightly connected to the base board. See part c in Figure 3-1.

4. Fasten the screws in both ends of the board panel clockwise. Ensure that the board is reliably fixed. See part d in Figure 3-1.

Figure 3-1 Board installation procedure

(a) (b) (c) (d)

Board Replacement Verification

[Inspection after the major operation]

During the board replacement, check the board status through the maintenance terminal. This is to minimize the impact of board replacement to service and ensure that the new board works properly after the replacement.

1. Check the indicators on the board panel

By checking the indicators on the board panel, you can determine whether the board works normally.

− Run the RST BRD command to reset the board.

− If the board is abnormal, press the RESET button on the board panel to reset it again. If there is no RESET button, remove and install this board again to ensure that the board is in proper contact with the base board.

2. Check the board status through the local maintenance terminal.

You can check the board status through the device management function of the local maintenance terminal or by using the DSP BRD MML command.


4. Run the DSP command to check whether H.248, M2UA, and M3UA links and circuits are normal.

5. Query call logs and check whether call loss occurs after the switchover.





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3.5 Cutting Off the Air Circuit Breaker on the Power Distribution Frame

[Risk level]

★★★★★

[Operation risk]

Misoperation causes service interruption.


1. Perform this operation at night when the traffic is low.

2. Check that the air circuit breaker on the cabinet is properly switched off according to the label for air circuit breaker on the cabinet.

3. Keep monitoring the system alarms.


1. Check whether they are abnormal alarms in the alarm subsystem and whether all new alarms in the alarm subsystem are cleared.


3. Query call logs and check whether call loss occurs after the operation.



6. If exceptions are detected in any of the preceding inspection, contact Huawei technical support immediately.

3.6 Replacement/Removal of Fan Frames[Risk level]

★★★

[Operation risk]

When the fan frame is removed, the frame is overheated if it works without a fan frame for a long time. As a result, the frame is powered off automatically.


1. After the fan frame is removed, reinstall it within ten minutes and ensure that it works normally.


2. Check whether they are abnormal alarms in the alarm subsystem and whether all new alarms in the alarm subsystem are cleared.



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3. Run the DSP FANSTAT. DSP FANTEM command to check whether the new fan frame works normally. Run the DSP BRD command to check whether the boards in each frame work normally.






3.7 Operations for Power Cable Connection[Risk level]

★★★★★

[Operation risk]

The connection of power cables should follow the sequence of protection grounding cable, grounding cable, and -48 V power cable. Misoperation may cause short circuit, thus causing the board to be burnt or the module to be powered off.


Perform this operation according to the installation guide.








3.8 Capacity Expansion for Service Frame[Risk level]

★★★★★

[Operation risk]

If the number of the frame whose capacity needs expansion is incorrectly set, other service frames will be reset, thus causing service interruption on the current network. In addition, if



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the cascading line of the frame whose capacity needs expansion is incorrectly connected, services are affected.



2. Ensure that the frame number is correctly set.

3. Ensure that the cascading line of the frame whose capacity needs expansion is correctly connected.

4. Check the voltage of the power distribution frame to ensure that it is within the normal range.

5. Check the resistance of the frame to ensure that there is no short circuit.



2. Run the DSP BRD command to check whether the new master board runs normally after the switchover.






3.9 Connecting Network Cables to an LSW/Router

[Risk level]

★★★★★

[Operation risk]

Misoperation may cause network storms and service interruption.


1. Ensure that the LSW does not form a loop after a network cable is connected.

2. The IP address that accesses the network does not conflict with IP addresses on the current network.

3. Understand the networking structure of the local bearer network and avoid performing any misoperation.

4. Shut down the interfaces that are not used on the LSW.






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3.10 Adjusting the LSW Configuration[Risk level]

★★★★★

[Operation risk]

Misoperation may cause interruption of the entire service.



2. Make full preparations before the operation and keep watching the system alarms

3. After the operation, watch the operation status of the system.

4. Shut down the interfaces that are not used on the LSW.








3.11 Version Upgrade[Risk level]

★★★★★

[Operation risk]

1. This operation leads to service interruption.


2. Make full preparations and perform this operation at night when the traffic is low.

3. Make a detailed upgrade scheme, including emergency measures.

4. Make a detailed dial-test scheme and perform the test after the upgrade.



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2. Run the DSP BRD command to check whether the boards in each frame are normal.

3. Run the CHK VERSION command to check whether the software in the hard disk on the master OMU is of the standard version.

4. Run the CHK VERSION command to check whether the software in the hard disk on the slave OMU is of the standard version.

5. Run the CHK FILE command to check whether the files in the hard disk on the OMU are correct.

6. Run the CHK VERSION command to check whether the software running on the board is of the standard version.

7. Run the DSP PATCH command to check the patch version.

8. Run the DSP command to check the status of H.248, M2UA, and M3UA links.




For details, see the UMG8900 software version upgrade instructions.

3.12 Activating/Deactivating Patches[Risk level]

★★★★

[Operation risk]

1. This operation leads to service interruption.

− [Mitigation measure]

− Make full preparations and perform this operation at night when the traffic is low.

− Pay attention to the operation sequence of patch installation. After activating a patch, test the service. When the test succeeds, run the CON PATCH command to confirm the patch. If it is not confirmed, when the board restarts, the previously activated patch disappears. In this case, reload the patch.


For details about patch test, see the UMG8900 VXXXRXXXCXXSPC/SPXXX patch Release Notes.


2. Run the DSP BRD command to check whether the boards in each frame are normal.

3. Run the DSP PATCH command to check the patch version.

4. Run the DSP command to check the status of H248, M2UA and M3UA links.






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3.13 System Time Adjustment[Risk level]

★★★★★

[Operation risk]

Misoperation causes the time of traffic statistics to be incorrect.


1. Ensure that the time is properly adjusted.


3. Check whether time is properly adjusted immediately after this operation.



2. Run the DSP TIME command to check whether the system time is normal.

3. Check whether the output of the traffic statistics task is normal.




3.14 Clock Adjustment[Risk level]

★★★

[Operation risk]

Misoperation causes intermittent interruption of narrow-band links, thus causing service interruption.



2. Make a scheme before the operation.

3. After the operation, keep watching alarms and fully test the service.



2. Run the LST CLK command to check whether the clock setting is consistent with the actually-connected clock.

3. Run the DSP CLK command to check whether the clock status of each board is normal.

4. Run the DSP TIME command to check the system time.

5. Run the DSP command to check H248, M2UA, and M3UA links.




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4 Commands to Be Used with

Caution

CAUTIONCertain maintenance commands of the UMG8900 greatly affect the entire system. Therefore, these commands should be used with caution or cannot be used.

4.1 Commands that Are Forbidden or Must Be Used with Caution

Command Reason for Forbiddance or Caution Forbiddance or Caution

DEA VMGW Causes gateways to quit service, thus interrupting all services.

This command is forbidden.

SWP MGC Causes gateways to switch to other MSC servers. Use this command with caution.

SET CLRCAL Causes call drops for a long time. Use this command with caution.

SET RESPLCY Causes changes in resource management policies, thus causing unbalanced CPU usages on resource boards.


MOD SFP Causes changes in service processes. This command is forbidden.

STR OLT Causes service interruption if there is service in the timeslot under test.


RMV H248LNK Causes interruption of the H.248 links. Service is interrupted if all links are broken.

Use this command with caution.



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SET CALLOT Causes changes in the call processing capability. Use this command with caution.

SET H248PARA May cause an interconnection problem when the parameter for connection with the Mc interface is modified.


SET VMGW May cause an interconnection problem when the parameter for connection with the Mc interface is modified.


RMV MGC Deleting the MSC server may cause the dual-home switchover function to fail.


MOD MGC May cause an interconnection problem when the parameter for connection with the Mc interface is modified.


DEA H248LNK Causes interruption of the H.248 links. Service is interrupted if all links are broken.


SET CODECCAP Causes repeated resetting of the VPU. Use this command with caution.

SET MRPARA May cause the ECU or VPU to reset. Use this command with caution.

SET ECPARA To set the tail length of the EC, reset the VPU. Use this command with caution.

SET IPISOL Causes certain IP services to fail. Use this command with caution.

SET JBUPARA Affects the voice quality. Use this command with caution.

SET IPBCP Affects the setup of IP bearer. Use this command with caution.

RMV IPIF Causes board resetting. Use this command with caution.

RMV FRM Causes service interruption in the frame. This command is forbidden.

RMV BRD Causes service application failures on the board. This command is forbidden.

RST BRD Causes service application failures on the board. Use this command with caution.

DEA BRD Causes service application failures on the board. Use this command with caution.

SWP BRD Causes board switchover. Use this command with caution.



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RST FRM Causes service interruption in the frame. Use this command with caution.

RST SYS Causes system resetting. Use this command with caution.

INH SIWFFUN Causes interruption of the IWF service. Use this command with caution.

LOD TOBAM A loading error causes exception. Use this command with caution.

LOD TOBT A loading error causes service interruption. Use this command with caution.

LOD TOBP A loading error causes service interruption. Use this command with caution.

LOD LAN A loading error causes service interruption. Use this command with caution.

RBK VERSION A rollback error causes system abnormality. This command is forbidden.

SET SCTPINIT May cause an interconnection problem when the parameter for connection with the Mc interface is modified.


RMV ROUTE Improper removal of routes may cause signaling interruption.


RMV IPADDR May cause service interruption. Use this command with caution.

MOD GWADDR May cause service interruption. Use this command with caution.

RMV GWADDR May cause service interruption. This command is forbidden.

MOD IPIF May cause service interruption. Use this command with caution.

RMV IPFWD May cause service interruption. This command is forbidden.

RMV IPPVC May cause service interruption. Use this command with caution.

MOD VMAC May cause service interruption. Use this command with caution.

RMV VMAC May cause service interruption. Use this command with caution.

MOD IFVLAN May cause service interruption. Use this command with caution.

RMV IFVLAN May cause service interruption. This command is forbidden.



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RMV RTBAK May cause service interruption. Use this command with caution.

RMV BFD May cause service interruption. Use this command with caution.

MOD RFCI May cause service interruption. Use this command with caution.

RST E1PORT May cause service interruption. Use this command with caution.

LOP E1 May cause service interruption. Use this command with caution.

RMV TDMIU May cause service interruption. Use this command with caution.

RMV SPC May cause service interruption. This command is forbidden.

RMV IWFE1 May cause data service interruption. Use this command with caution.

SWP TDMCAS May cause service interruption. Use this command with caution.

LOP S2L May cause service interruption. Use this command with caution.

SET S2LPORT May cause an interconnection problem. Use this command with caution.

SET S2LFRM May cause an interconnection problem. Use this command with caution.

RMV PG May cause service interruption. Use this command with caution.

ACT PATCH Misoperation causes software mismatching. Use this command with caution.

DEA PATCH Misoperation causes software mismatching. Use this command with caution.

CON PATCH Misoperation causes software mismatching. Use this command with caution.

RMV PATCH Misoperation causes software mismatching. Use this command with caution.

RMV M3LE May cause signaling interruption. Use this command with caution.

MOD M3DE May cause signaling interruption. Use this command with caution.



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RMV M3DE May cause signaling interruption. Use this command with caution.

MOD M3LKS May cause signaling interruption. Use this command with caution.

RMV M3LKS May cause signaling interruption. Use this command with caution.

MOD M3LNK May cause signaling interruption. Use this command with caution.

RMV M3LNK May cause signaling interruption. Use this command with caution.

REL M3LNK May cause signaling interruption. Use this command with caution.

DEA M3LNK May cause signaling interruption. Use this command with caution.

SET OFI After using this command to modify the RESTSRT function, reset the board so that the command can take effect.











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Documents

Guide to High-Risk Operations on the UMG8900