The over view of BBU3900 and BBU3910 full configurations:

In all scenarios, a FAN, a UPEU, and a UEIU are configured in fixed slots in a BBU. The following table describes the principles for configuring a FAN, a UPEU, and a UEIU.

A WBBP is a WCDMA baseband processing unit.

• A WBBP processes uplink and downlink baseband signals.
• A WBBP provides CPRI ports for communication with RF modules.
• A WBBPd supports interference cancellation (IC) within the board.
• When CPRI cables connect RF modules carrying corresponding cells to a WBBPd, the WBBPd installed in slot 2 or 3 supports interference cancellation (IC) of uplink data.
• A WBBPf installed in slot 2 or 3 supports baseband interconnection between BBUs.

The following figures show WBBP panels.

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