[Base Station Encyclopedia] UPEU Boards for BBUs (BBU Boards, Best Fri ...

What is a UPEU?

The universal power and environment interface unit (UPEU) 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.

A UPEU board can be used in any radio system. A BBU3900 or BBU3910 must be configured with a UPEU board. At least one UPEU board and a maximum of two UPEU boards can be configured in a BBU3900 or BBU3910. In addition, a UPEU board must be configured in slot 18 or 19.

What are the functions and working principle of a UPEU board?

A UPEU board converts -48 V DC input power into +12 V DC power and provides two ports with each transmitting one channel of RS485 signals and another two with each transmitting four channels of Boolean signals.

The working principle of a UPEU board is shown in the following figure.

For details, see section "UPEU" in BBU Hardware Description.

What are the types of UPEU boards?

From SRAN9.0 onwards, UPEU boards are classified into the following types:

l  UPEUa

l  UPEUc

l  UPEUd

Different UPEU boards have different appearances.

l  A UPEUc and a UPEUd have labels indicating their board types on the upper right corners of them, whereas a UPEUa does not have such a label.

l  The power port on a UPEUc or UPEUd is a 3V3 port, whereas that on a UPEUa is a 7W2 port.

l  The silkscreen above the power port on a UPEUc or UPEUd describes both voltage and current values, whereas that on a UPEUa describes only a voltage value.

For details, see section "UPEU" in BBU Hardware Description.

What are the meanings of "8A" and "15A"on the panels of a UPEUc and a UPEUd?

The silkscreen "8A" on a UPEUc panel indicates the rated current of a UPEUc, and the silkscreen "15A" on a UPEUd panel indicates the rated current of a UPEUd.

For details, see section "UPEU" in BBU Hardware Description.

What is the output power of a UPEU board? Is 1+1 backup supported when two UPEU boards are configured?

Different types of UPEU boards have different output power. The following table lists the output power of UPEU boards.

For details, see section "UPEU" in BBU Hardware Description.

Why does the preceding table not list the output power when different types of UPEU boards are configured in a BBU, such as UPEUa+UPEUc and UPEUc+UPEUd?

Note that a BBU cannot house two UPEU boards of different types, that is, such configurations as UPEUc+UPEUa and UPEUc+UPEUd are not supported. Currently, the maximum output power of UPEU boards is provided by the UPEUc+UPEUc configuration.

For details, see section "UPEU" in BBU Hardware Description.

What are the functions of Ethernet ports on a UPEU panel?

A UPEU board provides four monitoring/alarm ports to transmit two channels of RS485 signals and eight channels of Boolean signals.

The following table lists the mapping between ports and signals to be monitored.

For details, see section "UPEU" in BBU Hardware Description.

What are the relationships between line orders of the alarm cable and Boolean signals?

An alarm cable is an Ethernet cable with an RJ45 connector at each end. The following table lists the mapping between the line orders of the EXT-ALM0 and EXT-ALM1 ports and the Boolean signals.

For details, see section "UPEU" in BBU Hardware Description and section "BBU Alarm Cable" in 3900 Series Base Station Cables.

If the power required by a BBU exceeds the power supported by the configured UPEU board after baseband processing boards are added to the BBU, how should we adjust the configurations of UPEU boards?

l  If one UPEUa is configured for the original BBU, replace the UPEUa with two UPEUc boards to meet the current power requirement.

l  If one UPEUc is configured for the original BBU, add a UPEUc to achieve the maximum configuration.

l  If one UPEUc and one UEIU are configured for the original BBU, replace the UEIU with a UPEUc.

l  If two UPEUa boards, or one UPEUa and one UEIU are configured for the original BBU, replace the boards with two UPEUc boards.

For details, see section "Adding a UPEU" in the corresponding site maintenance guide.

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