6.6 Checking TRXs in Ring Topology. Huawei Technologies QISGRFU-1900

6 Optional Commissioning Tasks

BTS3900(A) GSM

Commissioning Guide transmission between the TRXs on the BTS side, or clear the alarm based on the BSS Alarm

Reference .

----End

6.6 Checking TRXs in Ring Topology

This describes how to check TRXs in ring topology on site. The following description is based on level 3 of TRXs in ring topology.

Prerequisite l l

The physical connection between TRXs in ring topology on the BTS side is complete.

The configuration of the TRXs in ring topology on the BSC side is complete.

Context l

Figure 6-8 shows the connection between TRXs in ring topology. A, B, C, and D indicate

the positions where the link may be broken during the ring topology transmission.

Figure 6-8 Connection between TRXs in ring topology

D R F U

R x 1 in

R x 1 o u t

A N T 1

R x 2 in

R x 2 o u t

A B

D R F U

R x 1 in

R x 1 o u t

A N T 1

R x 2 in

R x 2 o u t

R U N

A C T

C P R L 0

R S T

A L M

V S W R

C P R L 1

C P R I_ 0

C P R I_ 1

A N T 2

P W R

R U N

A C T

C P R L 0

R S T

A L M

V S W R

C P R L 1

C P R I_ 0

C P R I_ 1

A N T 2

P W R

C

RFU0 RFU1

BBU

D

D R F U

R x 1 in

R x 1 o u t A N T 1

R x 2 in

R x 2 o u t

R U N

A C T

C P R L 0

R S T

A L M

V S W R

C P R L 1

C P R I_ 0

C P R I_ 1

A N T 2

P W R

RFU2 l The GTMU reports SFP Port Inconsistency Alarm when the ring topology is used in physical connection but not in data configuration, or when the ring topology is used in data configuration but not in physical connection.

CAUTION

Do not set breakpoints on the LMT when the TRXs are cascaded through the SFP high-speed signal cable. Otherwise, the board will be seriously damaged. You can directly connect and disconnect the signal cable between the cascaded TRXs to check the connection between them.

Procedure

Step 1 Check whether the TRX ring topology is configured on the LMT.

If...

The ring topology is configured

Then...

Go to

Step 2

.

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Copyright © Huawei Technologies Co., Ltd.

Issue 02 (2009-04-20)

BTS3900(A) GSM

Commissioning Guide 6 Optional Commissioning Tasks

If...

Then...

The ring topology is not configured Configure the ring topology. For details, see the BSC

Initial Configuration Guide .

Step 2 Change the TRX ring topology test to TRX cascaded test. The purpose of setting breakpoints on the LMT is to simulate the scenario that faults occur on the transmission link. In this way, you can check whether the TRXs are automatically switched to chain topology and whether the alarm is reported.

1.

in the BSC6000 Local Maintenance Terminal window, right-click the target site, and choose Configure Site Board Attributes . The Site Device Attributes dialog box is displayed.

2.

Click Configure Site Board Attributes . The Site Device Attributes dialog box is

displayed, as shown in Figure 6-9 .

Figure 6-9 Site Device Attributes dialog box

Issue 02 (2009-04-20)

3.

Right-click the RXU chain, and choose Set Break Point . The Set RXU Chain Break

Point dialog box is displayed.

Huawei Proprietary and Confidential


6-15


BTS3900(A) GSM

Commissioning Guide

4.

Set the breakpoint to disconnect the level 3 TRX, as shown in

Figure 6-10

.

Figure 6-10 Set RXU Chain Break Point dialog box

5.

Click OK to return to the Site Device Attributes dialog box. The breakpoints marked with red cross are displayed, as shown in

Figure 6-11 .

Figure 6-11 Setting breakpoint successfully

6.

Click OK , and then click Finish to return to the BSC6000 Local Maintenance

Terminal window. The level 3 TRX is disconnected, and the Site Device Panel tab page displays the faulty state, as shown in

Figure 6-12

.



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BTS3900(A) GSM


Figure 6-12 Status of the disconnected TRX ring topology

7.

Right-click the site, and choose Configure Site Board Attributes from the shortcut menu.

The Configure Site Boards Attributes dialog box is displayed.

8.

Click Configure Site Board Attributes , the Site Device Attributes dialog box is displayed.

9.

Right-click the RXU chain, and choose Combine or Separate RXU Chain . The Split

RXU Chain

dialog box is displayed, as shown in Figure 6-13 .

Figure 6-13 Split RXU Chain dialog box

Issue 02 (2009-04-20)

10. Set Please select a point to split this RXU Chain to 2. Click OK , and then return to the

Site Device Attributes dialog box. The level 3 TRX is configured under the RXU link.

The start port is SFP1, as shown in Figure 6-14

.



6-17


Figure 6-14 Splitting RXU chain successfully

BTS3900(A) GSM

Commissioning Guide

11. Click OK , and then click Finish to return to the BSC6000 Local Maintenance

Terminal

window. Figure 6-15

shows the data configuration on the Site Device Panel tab page. The GTMU reports the SFP Port Inconsistency Alarm .

Figure 6-15 TRX ring topology in splitting state



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BTS3900(A) GSM


NOTE

After Step 2.11

is performed, the status of the RFU is Faulty, and the

TRX Communication

Alarm is reported. Wait one to two minutes, and the TRX Communication Alarm is cleared, and the state of the RFU is Normal.

Step 3 Change the TRX cascaded test to TRX ring topology test. The purpose of removing breakpoints on the LMT is to simulate the scenario that the faults on the transmission link. In this way, you can check whether the TRXs are automatically switched to ring topology and whether the alarm is automatically cleared.

1.

In the BSC6000 Local Maintenance Terminal window, right-click the target site and choose Configure Site Board Attributes . The Site Device Attributes dialog box is displayed.

2.

Click Configure Site Board Attributes . The Site Device Attributes dialog box is displayed.

3.

Right-click the RXU chain, and choose Combine or Separate RXU Chain . The Combine

RXU Chain dialog box is displayed.

4.

Set Chain No.

and Please select the RXU chains to be combined

, as shown in Figure

6-16

. The following description takes combining RXU chain 1 to RXU chain 0 as an example.

Figure 6-16 Combine RXU Chain dialog box

5.

Click OK , and return to the Site Device Attributes dialog box. The RXU Chain becomes

RXU Ring, as shown in Figure 6-17 .

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Figure 6-17 Combining RXU chain successfully

BTS3900(A) GSM

Commissioning Guide

6.

Click OK , and then click Finish to return to the BSC6000 Local Maintenance

Terminal

window. Figure 6-18

shows the status of boards on the Site Device Panel tab page. SFP Port Inconsistency Alarm is cleared. The level 3 TRX, however, is in the disconnected state due to the breakpoint. Therefore, TRX Communication Alarm is reported.



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Commissioning Guide

Figure 6-18 RXU ring in combined state


Issue 02 (2009-04-20)

7.

In the BSC6000 Local Maintenance Terminal window, right-click the target site and choose Configure Site Board Attributes , and the Site Device Attributes dialog box is displayed.

8.

Click Configure Site Board Attributes . The Site Device Attributes dialog box is displayed.

9.

Right-click the RXU chain, and choose Set Break Point . The Set RXU Chain Break

Point dialog box is displayed.

10. Delete breakpoints: Set Break Point 1 Position and Break Point 2 Position to NULL.

11. Click OK , and return to the Site Device Attributes dialog box. The two breakpoints marked with red cross are cleared.

12. Click OK , and then click Finish to return to the BSC6000 Local Maintenance

Terminal window. All the alarms are cleared, and the status of each board is normal, as shown in

Figure 6-19

.



6-21


Figure 6-19 RXU Ring in normal state

BTS3900(A) GSM

Commissioning Guide

6-22

----End

NOTE

After Step 3.12

is performed, the status of the RFU is Faulty, and the

TRX Communication

Alarm is reported. Wait one to two minutes, and the TRX Communication Alarm will be cleared, and the status of the RFU is Normal.



Issue 02 (2009-04-20)

BTS3900(A) GSM

Commissioning Guide 7 FAQs for BTS Commissioning

7

FAQs for BTS Commissioning

About This Chapter

This describes the fault symptoms and cause analysis in the BTS commissioning.

7.1 Failed Communication Between the SMT and the BTS

This describes the symptom of the communication failure between the SMT and the BTS and analyzes the cause of the failed communication. It also provides the fault handling suggestions.

7.2 Faulty E1 Link

This describes the fault symptom and analyzes the cause of the faulty E1 link. It also provides the fault handling suggestions.

7.3 Failure of an MS to Search the Network

This describes the fault symptom and analyzes the cause of the failure of an MS to search the network.

7.4 Service Dialing Failure

This describes the fault symptom and analyzes the cause of the service dialing failure. It also provides the fault handling suggestions.

7.5 Low GPRS Data Transmission Rate

This describes the fault symptom and analyzes the cause of low GPRS data transmission rate.

Issue 02 (2009-04-20) Huawei Proprietary and Confidential


7-1

6.6 Checking TRXs in Ring Topology. Huawei Technologies QISGRFU-1900

6.6 Checking TRXs in Ring Topology

FAQs for BTS Commissioning

About This Chapter

Related manuals

Table of contents

6.6 Checking TRXs in Ring Topology. Huawei Technologies QISGRFU-1900