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3900 Series Base Station GU Co-Cabinet
Solution Guide
Figure 3-9 Board configuration of the BBU3900
Configuration Principles of the RF Modules
Configuration principles of the RF modules are as follows:
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Cabling Principles
The usage of cable holes are as follows:
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The routing principles for the CPRI cables are as follows:
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The routing principles for the power cables of the RF cabinet are as follows:
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Issue 04 (2009-07-30)
If the total number of RF modules is not more than six, configure all the RF modules in
one RF cabinet. If the total number of RF modules is more than six and the WRFUs need
to be configured, configure all the WRFUs in the extension RF cabinet and the DRFUs in
the main RF cabinet.
In a single RF cabinet, the DRFUs and WRFUs are alternately installed. For example, the
DRFUs are installed in slots 0, 2, and 4, and the WRFUs are installed in slots 1, 3, and 5
of the cabinet. If only three RF modules working in the same standard are configured in
the RF cabinet, they should be configured in slots 0, 2, and 4 respectively.
The round cable holes are used for the cables between the APM30 and the RF cabinet in
stack mode.
The rectangular cable holes on the APM30 are used for the external cables when the APM30
is installed in stack mode.
The three rectangular cable holes on each side at the bottom of the RF cabinet are used for
the feeders, and the rectangular cable hole in the bottom middle of the RF cabinet is used
for the CPRI cables, power cables, and signal cables.
If the RF cabinet is installed separately as a remote unit, the round and rectangular cable
holes at the top of the RF cabinet are not used.
When the APM30 is stacked on an RF cabinet, the CPRI cables are led through the round
cable hole on the left of the APM30 (seen from the front).
When two RF cabinets are installed, the routing of the CPRI cables to the extension RF
cabinet is as follows: The CPRI cables are led into the RF cabinet under the APM30 through
the round cable hole on the APM30. After led through the rectangular cable hole in the
bottom middle of the RF cabinet, the CPRI cables are led into the base and then through
the rectangular cable hole in the bottom middle of the extension RF cabinet.
For a single RF cabinet on which the APM30 is stacked, the power cables are routed
downwards along the cable trough on the right of the APM30 (seen from the front). After
led through the round cable hole on the right of the APM30, the power cables are connected
to the DCDUs in the RF cabinet.
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