procedure for replacing duw bts ericsson

1. Description

This instruction describes procedures for replacing DUW without opening flash card and make warranty seal broken.
There are 3 method can be use for replacing DUW :
1.    Replace DUW – NodeB with Dual DUW (StandbyReady DUW faulty)
2.    Replace DUW – NodeB with Dual DUW using copy /c and /d  (Active DUW faulty )
3.    Replace DUW – NodeB with Single DUW using copy /c and /d
4.    Replace DUW – NodeB with Single DUW using restore a configuration version (CV)

All above procedures are executed from a PC/laptop that has serial and Ethernet connections to the node. The node does not have to be operational, but at least the DUW must be free from hardware faults.

This procedure base on OPI 119/1543-CRX 901 49/1 Uen N with additional of some screenshots of each step to make this document easy to be understand and to minimize human error.

2. Prerequisites

2.1. Document
Emergency Restoring a Configuration Version Backup (119/1543-CRX 901 49/1 Uen N)

2.2. Tool
•    Serial cable (IND 2040457 / M3) => direct connection
•    Ethernet cable (RPM 901 110 / M3) => direct connection
•    LAN cable => Ethernet via APP
•    RJ45 to serial cable => serial via APP
•    Serial to USB converter
•    Screwdriver Torx 8

2.3. Conditions
Before starting this procedure, ensure that the following conditions are available
1    Upgrade Package (match to CV)   
2     Latest CV backup from OSS   
3    Amos / Element Manager   
4    SecureCrt/Putty/Hyperterminal for serial connection  

3. Procedure

3.1. Replace DUW – NodeB with Dual DUW (StandbyReady DUW faulty)

When replacing a faulty DU, the replacement DU must have the same capacity as the faulty DU.
Note: It is not recommended to have any basic CV installed in the new DU, to avoid using the wrong CV for configuration.
If one of the DUs is replaced in a dual DU configuration, the node identity does not change
Note: It is recommended to change only one DU at a time, to avoid reconfiguring the RBS and to minimize RBS downtime

1.    Lock the DU to be replaced.
2.    Switch OFF the power to the DUW to be replaced using on / off button on the Power Distribution Unit (PDU) corresponding to the DUW.
3.    Disconnect all cables from the DU to be replaced.
4.    Replace the DUW with a new DUW.
5.    Put back all cables except “IDL” cable
6.    Switch ON the power to the DUW newly replaced using on / off button on the Power Distribution Unit (PDU) corresponding to the DUW
7.    Connect using serial cable
- DB9 connector on serial cable to COM1 of the client / laptop.
- RJ-45 connector on serial cable to LMT A port (DUW 20 01or DUW 30 01) or to LMT port (DUW 41 01)
8.    Use any software for terminal emulation in the PC, for example Windows HyperTerminal/ SecureCrt/Putty, and configure it for communication over COM1 with the following parameters:
a.    baud rate = 9600 bits per second
b.    parity = none
c.    stop bits = 1 bit
d.    data bits = 8 bits
e.    flow control = none / XON/XOFF
9.    In the communication window of the terminal emulation software, click OK or press Enter
10.    The $ prompt is shown indicating that a serial connection to the DU is established
11.    Enter backup mode by using command “reload  --” 
12.    Verify that the /c2 volume is mounted, using the command vols /c2.
 If the /c2 volume is not mounted, mount the volume, using the command: mount_c2.
13.    Use command “vols”
14.    Please pay attention that in backup mode /c will become /c2 but /d will remain /d
15.    Format the /c2 disk using the command formathd /c2
16.    Format the /d disk using the command formathd /d
17.    Use command reload
18.    Plug-in the Inter-DU Link-cable (IDL) to new DUW.
19.    Turn Off and then Turn On both DUW.
20.    New DUW will restore automatically / synchronizing
21.    Check the result from existing DUW by Connect using Eth connection (RJ-45 cable) LMT B     port (DUW 20 01 and DUW 30 01) or to LMT port (DUW 41 01)
22.    Use the Element Manager or AMOS to check the state of faultTolerantCoreStates on MO ManagedElement.
The already configured DUW has state Active.
The new DU has state PassiveNotReady during the restore procedure. This can take several minutes.
The new DU has state PassiveReady when the restore procedure is finished.
23.    Unlock the new DU
24.    Check the optical indicators; check the indicator status and ensure that all configured hardware is functional
25.    Check the alarm list using the RBS EM and verify that there are no alarms indicating DU problems






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