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Instructions

1. Set the DIP Switch of Active BBU like this:

(1)OFF/OFF/OFF/OFF/OFF/OFF/OFF/OFF(8)

Set the DIP Switch of Extension BBU like this:

(1)OFF/OFF/OFF/ON/OFF/OFF/OFF/OFF(8)

Figure No 1. DIP Switch on the BBU3806 

- Bits 1 to 3, labeled TYPE, are set to OFF by default and reserved.

- Bits 4 to 6, labeled LOCAT_ID, are used to set the working mode of the BBU3806 to

active or extension.

- Bits 7 and 8, labeled E1/T1, are set to OFF by default and reserved.

Table 1, Table 2 and Table 3 describe the settings of the 8-bit DIP switch.

Table No 1. Settings of the 8-bit DIP switch – 1.

Bit 1 Bit 2 Bit 3 Description

OFF OFF OFF The DIP switch is not

defined. Bits 1 to 3 are setto OFF by default.

Table No 2. Settings of the 8-pin DIP switch – 2.

Bit 4 Bit 5 Bit 6 Description

OFF OFF OFF The active BBU3806 is

used. Bits 4 to 6 are set to

OFF by default.

ON OFF OFF The extension BBU3806

is used.

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Table No 3. Settings of the 8-pin DIP switch – 3.

Bit 7 Bit 8 Description

OFF OFF Bits 7 and 8 are set to OFF by

default and reserved. 

2. Connect the active BBU3806 with the extension BBU3806 through the EIa port.

Figure No 2. Front Panel of the BBU3806 

3. Use the command “ADD BBU: SRN=1;” for adding the new BBU.

4. Use the command “MOD ULGROUP: ULGROUPN=0, RGOPTYPE=ADDULPUNIT, SRNE=1;”

for adding the new BBU to the Uplink Baseband Resource Group (Increase the capacity of CEs of theNode B in Uplink). 

5. Use the command “MOD DLGROUP: DLGROUPN=0, RGOPTYPE=ADDDLPUNIT, SRNE=1,

SNE=0;” for adding the new BBU to the Downlink Baseband Resource Group (Increase the capacity ofCEs of the Node B in Downlink). 

6. Use the command “DSP BRD:;” for checking the status of the Boards. All the Boards should be normal

as you can see on the following picture. 

Figure No 3. Board Status 

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7. If the following alarms appear on the NodeB and they doesn’t clear you have to check the

DIP Switch Configuration and Connection between both BBUs.

Figure No 4. BBU High Speed Interface Abnormal Alarm

Figure No 5. Board Maintenance Link Abnormal Alarm

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8.  Use the command “LST DLGROUP:;” for checking the configuration of the Downlink

Group. You can see on the Figure Nº 6 that both BBUs belong to the Downlink Group.

(Subrack Nº 0, Slot Nº 0 and Subrack Nº 1, Slot Nº 0).

Figure No 6. DL Group 

9.  Use the command “LST ULGROUP:;” for checking the configuration of the Uplink Group.

You can see on the Figure Nº 7 that both BBUs belong to the Uplink Group. (Subrack Nº 0,

Slot Nº 0 and Subrack Nº 1, Slot Nº 0).

Figure No 7. UL Group