I have created this table to summarize the function of each board in the BBU, I hope you will find it useful.
| UPEU | It is a power module used for converting -48 V input power into +12 V DC power and then distributing the power to other boards in a BBU. |
| UEIU | It is configured when the environment interfaces are insufficient. |
| UMPT | Processes signaling and manages resources for other boards in the BBU, Transmission processing |
| WMPT | Processes signaling and manages resources for other boards in the BBU, Transmission processing 3G WCDMA |
| GTMU | Processes signaling and manages resources for other boards in the BBU, Transmission processing 2G GSM |
| LMPT | Processes signaling and manages resources for other boards in the BBU, Transmission processing 4G LTE |
| UBBP | Provides CPRI ports for communication with RF modules, Processes uplink and downlink baseband signals |
| WBBP | Provides CPRI ports for communication with RF modules, Processes uplink and downlink baseband signals 3G |
| LBBP | Provides CPRI ports for communication with RF modules, Processes uplink and downlink baseband signals 4G |
| UTRP | It is an extended transmission board |
| USCU | Provides ports for communicating with satellites |
| UBRI | Provides extended CPRI optical or electrical ports |
| UCCU | Allows the BBU to exchange data with the USU. |
