Ericsson MINI-LINK TN R3 ETSI Technical Description page 91

Radio Terminals
MMU. This is accomplished by the NPU configuring the MMUs to listen to a
certain TDM bus slot.
The Diversity switches will work autonomous and is controlled by the switch
logic in the active MMU Rx. This is in accordance with the Radio Segment
Protection case, with the difference that signal failure alarms have a higher
priority level than the EW signals.
Alarms generated in the RAU and MMU are monitored by the NPU, which
based on the alarm severity commands the TDM switch as appropriate.
The switching principles are illustrated in Figure 74 on page 84.
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