Huawei CBTS3612-800 Maintenance Manual

User Manual
Airbridge cBTS3612-800 12-carrier CDMA Base Station	Table of Contents

Table of Contents

1 Overview ......................................................................................................................................	1-1
1.1 Purposes of cBTS3612-800 Routine Maintenance............................................................	1-1
1.2 Classification of cBTS3612-800 Routine Maintenance Operations ...................................	1-1
1.2.1 Classification According to Implementing Methods.................................................	1-1
1.2.2 Classification by Period Length ...............................................................................	1-1
1.3 Guide to the Usage of cBTS3612-800 Routine Maintenance records and cBTS3612-800
Routine Maintenance Instructions............................................................................................	1-2
1.3.1 cBTS3612-800 Daily Unexpected Fault Handling Record ......................................	1-3
1.3.2 cBTS3612-800 Monthly Maintenance Record.........................................................	1-4
1.3.3 cBTS3612-800 Quarterly Maintenance Record ......................................................	1-5
1.3.4 cBTS3612-800 Yearly Maintenance Record ...........................................................	1-6
2 cBTS3612-800 Monthly Maintenance Instructions ..................................................................	2-1
3 Quarterly Maintenance Instructions .........................................................................................	3-1
4 cBTS3612-800 Yearly Maintenance Instructions .....................................................................	4-1
5 Return Loss, VSWR and Reflection Coefficient ......................................................................	5-1

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Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

1 Overview

cBTS3612-800 Routine Maintenance Instructions describes in details the contents and methods of cBTS3612-800 routine maintenance operations. It serves as a reference in determining the routine maintenance schedule of a particular site. cBTS3612-800 Routine Maintenance consists of:

1)Purpose of cBTS3612-800 routine maintenance;

2)Classification of cBTS3612-800 routine maintenance operations;

3)Logging of routine maintenance operations.

1.1Purposes of cBTS3612-800 Routine Maintenance

Normal system operation of cBTS3612-800 in different running environment depends on effective routine maintenance. cBTS3612-800 routine maintenance is intended to detect and solve problems in due time to prevent trouble.

1.2 Classification of cBTS3612-800 Routine Maintenance

Operations

1.2.1Classification According to Implementing Methods

I.Conventional maintenance

To observe the operation of the system, and test and analyze equipment performance during system operation.

II. Unconventional maintenance

To test if the performance of system equipment has degraded by artificially creating some faults and observe system performance with these faults. For example, maintenance personnel may artificially create some faults and test if the alarm system reports alarm correctly.

1.2.2Classification by Period Length

I.Unscheduled maintenance

Maintenance operations incurred by equipment fault or network adjustment. For example, maintenance tasks triggered by user complaint, damage of equipment and

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Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

line fault. Solving of problems left over by daily maintenance operations is also regarded as unscheduled maintenance operation.

II. Daily maintenance

Maintenance tasks conducted daily. cBTS3612-800 Daily maintenance helps maintenance personnel keep track of the operating conditions of the equipment at any moment so that problems can be solved in time. When a problem is detected in daily maintenance, record it in detail to help eliminate it in time.

III. Periodical maintenance

Maintenance tasks conducted regularly. Periodical maintenance helps maintenance personnel keep track of the long-term performance of the equipment.

Periodical maintenance includes: monthly maintenance, quarterly maintenance and yearly maintenance.

1.3 Guide to the Usage of cBTS3612-800 Routine Maintenance records and cBTS3612-800 Routine Maintenance Instructions

1)Note down in details the unexpected faults occurred in cBTS3612-800 daily maintenance operations in cBTS3612-800 Daily Unexpected Fault Handling Record for future reference. The user may modify the record according to the actual needs, or compile the records into manuals.

2)Note down in details the actual maintenance operations carried out during cBTS3612-800 monthly maintenance in cBTS3612-800 Monthly Maintenance Record. For details, see cBTS 3612 Monthly Maintenance Operation Instruction.

3)Note down in details the actual maintenance operations carried out during cBTS3612-800 quarterly maintenance in cBTS Quarterly Maintenance Record. For details, see cBTS 3612 Quarterly Maintenance Operation Instruction.

4)Note down in details the actual maintenance operations carried out during cBTS3612-800 yearly maintenance in cBTS3612-800 Yearly Maintenance Record. For details, see cBTS 3612 Yearly Maintenance Operation Instruction.

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User Manual
Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

1.3.1 cBTS3612-800 Daily Unexpected Fault Handling Record

Site		Belong-to BSC
Time when fault		Time when fault is
occurred:		solved:
Person on duty:		Handled by:
Classification of fault:
Primary power supply
Secondary power supply		CDU/DFU/RLDU Subrack
Base Band Subrack		Antenna & Feeder System
RF Subrack		Others

Fault detected:
?	With user complaint	?	From the alarm system
?	In Daily maintenance	?	From other sources

Description of fault:

Alarm Handling & Result:

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Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

1.3.2 cBTS3612-800 Monthly Maintenance Record

Site: _______________

Time of

maintenance:____(MM)_____(DD)_____(YY)

Maintainer:

____(MM)____(DD)____(YY)

Items

Status

Remarks

Maintenance

personnel

Environment

•Normal, •Abnormal

Temperature

•Normal, •Abnormal

Humidity

•Normal, •Abnormal

Dust-proof performance

•Normal, •Abnormal

Indoor air-conditioner

•Normal, •Abnormal

Call test

•Normal, •Abnormal

Battery group

•Normal, •Abnormal

Grounding, lightening protection and power

•Normal, •Abnormal

supply system

RF antenna and feeder part

•Normal, •Abnormal

Satellite antenna and feeder part

•Normal, •Abnormal

Secondary power supply

•Normal, •Abnormal

Description of fault and

handling measures taken

Problems remained

Monitor check

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Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

1.3.3 cBTS3612-800 Quarterly Maintenance Record

Site: _______________

Time of
maintenance:____(MM)_____(DD)_____(YY)		Maintainer:
____(MM)____(DD)____(YY)
Items		Status	Remarks		Maintenance personnel
Primary power supply		•Normal, •Abnormal
Fans		•Normal, •Abnormal
Road test		•Normal, •Abnormal
Alarm collection equipment		•Normal, •Abnormal	When available
Description of fault and
handling measures taken
Problems remained
Monitor check
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Airbridge cBTS3612-800 12-carrier CDMA Base Station	1 Overview

1.3.4 cBTS3612-800 Yearly Maintenance Record

Site: _______________

Time of maintenance:____(MM)_____(DD)_____(YY)

Maintainer:

____(MM)____(DD)____(YY)

Items

Status

Remarks

Maintenance

personnel

Call test

•Normal, •Abnormal

Cabinet sanitation

•Normal, •Abnormal

BTS power output

•Normal, •Abnormal

Grounding resistance and grounding wires

•Normal, •Abnormal

Water-proof performance of antenna and feeder

•Normal, •Abnormal

connector and lightening protection grounding clip

Firmness and angle of antenna

•Normal, •Abnormal

Description of fault and handling

measures taken

Problems remained

Monitor check

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User Manual	2 cBTS3612-800 Monthly Maintenance
Airbridge cBTS3612-450 12-carrier CDMA Base Station	Instructions

2 cBTS3612-800 Monthly Maintenance

Instructions

	Items		Instructions	Note
		Make calls with an MS. Collect information at both		There should be no noise, no call
	Call test	the MS and the BSC to see if all calls are normal
				dropping, nor cross talking.
		for all sector carriers.
	Grounding, lightening protection	1)	Check the connections in the grounding system
		and the lightening protection system.		Keep the lightening protector for the
	system (including E1 lightening
		2)	Check if the power supply system is normal.	power supply system and the antenna
	protection board) and power
		3)	Check if any part of the lightening protector is	and feeder system in good shape.
	supply system
		burnt.
		1)	Check if there is any VSWR alarms;
		2)	Check if the support of the antenna is set to the
	Antenna and feeder part	correct direction;		Query at the maintenance console.
		3)	Check if the water-proof performance of the
		feeder is normal.
	Secondary power supply	Check if there is any alarm on the fault of the
		secondary power supply module.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	3 Quarterly Maintenance Instructions

3	Quarterly Maintenance Instructions
Items		Instructions	Note
Primary power supply		Measure the output voltage.	Range of normal output voltage: -40- 60V.
			Alarm may be triggered when:
		1) Check if the fans are working normally.	1) Some of the fans are unable to rotate;
Fans		2) Check if there is any alarm reported on the fault	2) Temperature of some of the fans is
		of fans.	abnormal;
			3) Fan rotational speed control is faulty.
Road test		Test on the handoff and coverage area of the cells
		with a test MS.
VSWR		Check at the maintenance console if there is any
		VSWR alarms.
Alarm collection		Check if the alarm collection equipment (including
equipment		that on humidity, temperature and fire) is normal.
Equipment room		Check the temperature, humidity, dust-proof	Temperature: -5âC~50âC.
		performance, and anti-static performance of the
environment			Relative humidity: 5%~90%.
		equipment room.

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User Manual	4 cBTS3612-800 Yearly Maintenance
Airbridge cBTS3612-450 12-carrier CDMA Base Station	Instructions

4 cBTS3612-800 Yearly Maintenance Instructions

	Items	Instructions	Note
		Make calls with an MS. Collect information at both the	There should be no noise, no call
	Call test	MS and the BSC to see if all calls are normal for all
			dropping, nor cross talking.
		sector carriers.
			Impose strict operation regulations
	Cabinet sanitation	Tools required: Vacuum cleaner, alcohol and towel.	to prevent misoperation on power
			supply.
	BTS power output	Test the output power of the RFs.	Check if the output is the same as
			recorded in the BSC.
		1). Measure the grounding resistance with proper test
	Grounding resistance and	instruments.
	grounding wires	2). Check if the connector of the grounding wires are
		normal
	Water-proof performance of		Wrap up the checked parts with
	antenna and feeder connector	1). Check the external parts;
			the same material used before the
	and lightening protection	2). Unwrap them and check.
			check.
	grounding clip
	Firmness and angle of	1). Tighten the screw with the wrench.	Do not apply too much force with
	antenna	2). Check if the angle are correctly set.	the wrench.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station 5 Return Loss, VSWR and Reflection Coefficient

5 Return Loss, VSWR and Reflection Coefficient

Return loss(dB)	VSWR	Reflection Coefficient (Γ)
4	4.41943	0.63096
5	3.56977	0.56234
6	3.00952	0.50119
7	2.61457	0.44668
8	2.32285	0.39811
9	2.09988	0.35481
10	1.92495	0.31623
11	1.78489	0.28184
12	1.6709	0.25119
13	1.57689	0.22387
14	1.49852	0.19953
15	1.43258	0.17783
16	1.37668	0.15849
17	1.32898	0.14125
18	1.28805	0.12589
19	1.25276	0.1122
20	1.22222	0.1
21	1.19569	0.08913
22	1.17257	0.07943
23	1.15238	0.07079
24	1.13469	0.0631
25	1.11917	0.05623
26	1.10553	0.05012
27	1.09351	0.04467
28	1.08292	0.03981
29	1.07357	0.03548
30	1.06531	0.03162
31	1.058	0.02818
32	1.05153	0.02512
33	1.0458	0.02239
34	1.04072	0.01995
35	1.03621	0.01778
36	1.03221	0.01585
37	1.02866	0.01413
38	1.0255	0.01259
39	1.0227	0.01122
40	1.0202	0.01
41	1.01799	0.00891
42	1.01601	0.00794
43	1.01426	0.00708
44	1.0127	0.00631
45	1.01131	0.00562
46	1.01007	0.00501
47	1.00897	0.00447
48	1.00799	0.00398
49	1.00712	0.00355
50	1.00634	0.00316

Formulas for calculating reflection coefficient G, return Loss RL, and VSWR is displayed in the following table:

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Airbridge cBTS3612-450 12-carrier CDMA Base Station 5 Return Loss, VSWR and Reflection Coefficient

Reflection Coefficient G				VSWR	Return loss(dB)
Γ=	Ureflected		VSWR=	Uforward+Ureflected	Uforward
					RL= 20lg Ureflected
	Uforward			Uforward- Ureflected

Γ=	1		VSWR=		1+Γ		1
	alg ( 20RL)						RL= 20lg Γ
					1−Γ
		VSWR−1	alg (RL)+ 1
Γ=			VSWR =	20			VSWR+1
							RL= 20lg VSWR−1
		VSWR+1		RL
			alg (
				20 )−1

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Airbridge cBTS3612-800 12-carrier CDMA Base Station	Table of Contents

Table of Contents

1 MS Unable to Access Network ..................................................................................................		1-1
1.1	About Mobile Station Network Access ...............................................................................	1-1
1.2	Disabled Mobile Station Network Access...........................................................................	1-1
2 Conversation Fault .....................................................................................................................		2-1
3 Software Downloading Failure Fault.........................................................................................		3-1
3.1	Description of Fault ............................................................................................................	3-1
3.2	Fault Analysis and Location ...............................................................................................	3-1
4 Base Station Initialization Failure Fault....................................................................................		4-1
4.1	Description of fault..............................................................................................................	4-1
4.2	Fault Analysis and Location ...............................................................................................	4-1
5 Signaling Link Fault....................................................................................................................		5-1
5.1	OML Signaling Link Fault ...................................................................................................	5-1
5.2	Abis Signaling Link Fault ....................................................................................................	5-2
6 Part Module Fault........................................................................................................................		6-1
6.1	Description of Part Fault.....................................................................................................	6-1
6.2	Processing of Common Board Faults ................................................................................	6-2
6.3	BTS Control Interface Module (BCIM) ...............................................................................	6-4
6.4	BTS Control & Clock Module (BCKM)................................................................................	6-5
6.5	BTS Channel Processing Module (BCPM) ........................................................................	6-6
6.6	BTS Resource Distribution Module (BRDM) ......................................................................	6-7
6.7	BTS Transceiver Module (BTRM) ......................................................................................	6-7
6.8	BTS High Power Amplification (BHPA) Module .................................................................	6-9
6.9	Receiving Line Division Unit (RLDU) ...............................................................................	6-11
6.10 Power Supply Unit (PSU) ...............................................................................................		6-11
7 Antenna Feeder Fault .................................................................................................................		7-1
7.1	Radio Frequency Antenna Feeder Part .............................................................................	7-1
7.2	Satellite Antenna Feeder Part ............................................................................................	7-1

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	1 MS Unable to Access Network

1MS Unable to Access Network

1.1About Mobile Station Network Access

Once powered on, an MS first enters the System Determination Substate and then selects an analog system or CDMA system based on the parameters predefined in the mobile station by the user. If the CDMA system is selected, the mobile station will attempt to capture it and enters the Pilot Channel Acquisition Substate.

In this substate, the mobile station will first search the primary frequency bands for all pilot channels (search all PN offsets), and captures the strongest pilot channel. If there are no pilot channels captured on the basic frequency bands, the mobile station will tune to an auxiliary frequency band and continue searching for a pilot channel. When the mobile station has captured a pilot channel, it enters the Sync Channel Acquisition Substate.

In this substate, the mobile station will attempt to obtain a sync channel and receive synchronization messages. And by means of these messages, the mobile station can obtain the pilot PN offset, network system identity, long code status, system time, paging channel rate, frequency bands on which basic paging channels are, etc. Once this information is obtained, the mobile station will enter the Timing Change Substate.

In this substate, the mobile station will use the pilot PN offset, long code status received in the sync channel messages and synchronizes the long code status and system timing with the CDMA system timing. After that, the mobile station will enter the Mobile Station Idle State.

In the idle status, the mobile station needs to receive the overhead messages on the paging channels. The mobile station cannot work normally unless it has received correct Overhead Messages within the specified period of time.

If all the above conditions are satisfied, the mobile station will normally gain access to

anetwork.

1.2Disabled Mobile Station Network Access

1.2.1 Description of Fault

When started, the mobile station cannot access the CDMA network.

1.2.2 Fault Analysis and Location

Before locating any base station fault, make sure that the parameters for a mobile station are correctly set, such as the basic frequency band, auxiliary frequency band, SID, NID, etc.

I. Base station not in service

The base station is not in service and the mobile station cannot gain access to a network. The causes for the base station not to be in service include:

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1)The base station equipment in a faulty status makes the base station fail to be in service.

2)The base station has not obtained correct configuration data, which leads to the base station not being in service.

For the troubleshooting details, please refer to "4 Base Station Initialization Failure Fault".

II. Abis signaling link fault

Abis signaling link fault will disable the network access of a mobile station.

1)If any fault occurs to the Abis signaling link after a base station has been in service, BSC cannot implement any logical configuration for the base station and accordingly the mobile station cannot gain access to a network.

2)If a base station has obtained its logic configuration, when any fault occurs to the Abis signaling link, the base station will cut off the transmission signals of BTRM corresponding to all sector carriers and this makes a mobile station unable to gain access to a network.

At an OMC or near-end maintenance console of a base station, query the current alarm of the base station to make sure whether there exists any "Abis signaling link fault" alarm.

For the troubleshooting details, please refer to "5.2 Abis signaling link fault".

III.A cell has not obtained the logic configuration of BSC

1)If a cell has no logical configuration, that is to say, such common channels as pilot, synchronization, paging, etc. have not been established or overhead messages not updated, the mobile station naturally cannot gain access to a network.

View the confiuguration process report of a cell at the OMC maintenance console. If the cell does not report the process of "Common channel successfully established" and "Overhead message successfully updated", it shows that the cell has no logic configuration.

2)Unavailable physical equipment or operation & maintenanace (for example, deletion of the equipment) results in the deletion of a logic cell, therefore the mobile station cannot gain access to a network.

View the configuration process report of a cell at an OMC maintenance console. If the cell reports the process report of "Cell deleted", it shows that the cell has been deleted.

In addition, you may query whether a cell has its logic configuration via the "Cell Status Query" command at the OMC maintenance console.

If a cell has not obtained its logic configuration, then check point by point:

•Whether the BTRM used in this cell works normally.

•Whether the BCPM used in this cell works normally.

•Whether the corresponding BRDM works normally.

•Whether the optical fiber of BTRM and that of BRDM are correctly connected.

•Whether BCIM works normally.

•Whether the Abis signaling link is in connected status.

•Whether BSC works normally.

•Check the configuration parameters of BTS and BSC and make sure that they are in accordance.

If any problem is found at some step, handle it according to the corresponding chapter or section. For example, a BTRM module fault should be handled as described in "6.5 BTS Transceiver Module (BTRM)".

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	1 MS Unable to Access Network

IV. This cell is in blocked status

If you see at the OMC maintenance console that the logic configuration of a cell has been completed, but the mobile station still cannot gain access to a network, then you can check whether this cell is in blocked status.

When a cell is in blocked status, the base station will cut off the transmission signals of BTRM corresponding to this cell carrier and this makes the mobile station unable to gain access to a network.

You may query BTRM status at the OMC maintenance console to see whether the BTRM corresponding to this cell has been blocked.

If the cell is in blocked status, the mobile station cannot gain access to a network until the user has unblocked it.

V. Abnormal receiving channel

If you see at the OMC maintenance console that the logic configuration of a cell has been completed, but the mobile station still cannot gain access to a network, then you can check whether the receiving channel of a base station is abnormal.

An abnormal BS receiving channel will lead to excessive receiving error codes and frequent mobile station dropouts. The mobile station, when started, will send a power-on registration message to the system. However, the base station cannot receive this registration message because of a faulty receiving channel. Thus, the base station will not send any base station answer instruction to this mobile station, which leads to failed registration of this mobile station. Because of failed registration, the mobile station enters the system defining sub-status and recaptures the system. When the system is captured, the mobile station will start again the power-on registration. Such things happen repeatedly, so that the mobile station cannot gain access to a network.

You may test the mobile station via CDMA and trace air interface messages. If the mobile station sends "Registration message" but does not receive any "Base station answer instruction" message, it shows that some fault has occurred to the reverse receiving channel of the base station.

If there exists any receiving channel abnormality, you may check point by point as follows and make judgements by viewing related indicators, querying the board status and alarm information, etc.

•Whether the CDU, RLDU and BTRM module are well installed and the panel screws are correctly fastened.

•Whether the antenna feeder connection is correct.

•Whether the CDU works normally.

•Whether the RLDU works normally.

•Whether the configuration selection switch "S/W" on the RLDU panel is set correctly. For the description of RLDU panel switch, please refer to "Board Indicator and DIP Switch" of "Base Station Maintenance" part in the user manual.

•Whether the BTRM works normally.

•Whether the BCPM works normally.

•Whether the blind plugs of various modules of the receiving channel are normally connected and there is any loosening.

•Whether the physical configuration data of the base station are correct, including the cell parameter, backward search parameters, etc.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	1 MS Unable to Access Network

If any problem is found at some step, handle it according to the corresponding chapter or section. For example, a BTRM module fault should be handled as described in "6.5 Transceiver Module (BTRM)".

VI. Abnormal transmission channel

Transmission activation (BTRM), BHPA, CDU and antenna feeder form the transmission channel. But an abnormal transmission channel will lead to no output signal from the base station or abnormal output signals. In this case, you may see at the OMC maintenance console that the logic configuration of a cell has been completed, but the mobile station still cannot gain access to a network. Then, you may check point by point as follows:

•Whether the CDU, BHPA module and BTRM module are well installed and the panel screws correctly fastened.

•Whether BTRM transmission activation part works normally.

•Whether the CDU works normally.

•Whether BTRM and BHPA are normally connected.

•Whether the BHPA works normally.

•Whether BHPA and CDU are connected.

•Whether the feeder connection between CDU and the cabinet top is normal.

•Whether the feeder connection between the cabinet top and the antenna is normal.

•Whether the blind plugs of various modules of the receiving channel are normal and whether there is any loosening.

•Whether the antenna is correctly installed.

•Whether there is any standing wave ratio alarm.

If any problem is found at some step, handle it according to the corresponding chapter or section. For example, a BTRM module fault should be handled as described in "6.5 Transceiver Module (BTRM)".

VII. The cell gain and common channel gain are not correctly set

You may see at the OMC maintenance console that the logic configuration of a cell has been completed, but the mobile station still cannot gain access to a network. In this case, you may check whether various gain parameters during the cell configuration are correctly set.

When the cell is logically configured, such parameters as the sector gain, carrier gain, pilot channel gain, synchronization channel gain, paging channel gain, etc. must be configured. If these parameters are improperly set (for example, excessively small), the mobile station will not be able to capture the corresponding common channel and this makes the mobile station unable to gain access to a network.

Make sure whether the gain parameters contained in Abis-Cell Setup message are reasonable via the Abis interface message tracing tool. If unreasonable, the data configuration table of BSC must be modified and the gain parameters be configured again.

VIII. The overhead message content is not correct

You may see at the OMC maintenance console that the logic configuration of a cell has been completed, but the mobile station still cannot gain access to a network. In this case, you may check whether the overhead message content is correct.

Upon entering the idle status, the mobile station must receive all overhead messages (including at least the following four: the access parameter message, system parameter message, CDMA channel list message and adjacent area list message.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	1 MS Unable to Access Network

Other overhead messages depend on the setting of network parameters) configured in the whole system within the specified period of time. Otherwise, the mobile station cannot gain access to a network.

In addition, the value of the parameters in each overhead message will also make the mobile station unable to gain access to a network and needs confirming carefully.

With the air interface message signaling analyzer, you may check whether the mobile station has received the overhead messages configured in the whole system. In addition, you should check whether the parameter value of each overhead message is correct. If not, you may modify the data configuration table of BSC and update the overhead message again.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	2 Conversation Fault

2 Conversation Fault

For the content in this chapter, please refer to related parts in BSC Maintenance Manual.

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Airbridge cBTS3612-450 12-carrier CDMA Base Station	3 Software Downloading Failure Fault

3Software Downloading Failure Fault

3.1Description of Fault

I.FTP client login failure

OMC sends a command to an OMU (a base station operation & maintenance unit running on BCKM) to start downloading files from BAM. The OMU receives the command, but cannot log on to the FTP server of BAM. In this case, OMC background receives the abnormal halt message of OMU and FTP client login fails.

II. Abnormal halt of file loading by the board

When some board software is downloaded and activated by means of OMC, it is found that the whole stage from the starting of downloading and activating to the waiting for the activation report is normal. Then, OMC receives the abnormal halt message of OMU and file loading is abnormally halted by the board.

3.2 Fault Analysis and Location

I. FTP client login failure

1) Check whether the FTP server on BAM is in Stop status or correctly set.

First view whether the FTP server is in Stop status. If it runs normally, then check whether the FTP server is set correctly. FTP server settings include the following four: user name, user password, user accessible path and access authority. Any setting error will lead to failed login or failed board software loading.

When a base station loads software, the above four items are set as follows:

User name:

Password:

Access path:

Access authority:

OMU

OMU

Required to include the file path specified in the software uploading/downloading command.

The directory to be uploaded must be set as readable and writable.

2)Check whether OMU BOOTP is normal

OMU obtains the IP address of a base station by means of BOOTP request. If this process fails, OMU will not be able to obtain the IP address of the base station and naturally cannot log on to the FTP server of BAM. Usually, a disconnected link, wrong route or configuration data error may lead to the failed BOOTP process. These should be eliminated one by one. For details, please refer to "5.1 OML Signaling Fault".

II. Abnormal halt of file loading by the board

All load files must have the file headers in stipulated format, in which the file ID and file version must be consistent with the corresponding field in the activation command sent by OMC. Otherwise, the board will consider the software actually downloaded as inconsistent with that to be loaded and reports abnormality error.

03Q-0112-20020720-120

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