
Figure 88 General power troubleshooting, part 2
Baseband serial interface troubleshooting
CBUS interface
CBUS is a three-wire serial interface between the main baseband components.
The bus consists of data, clock and bus_enable signals. The bus is connected between UPP_WD2, UEMEK and
ZOCUS. UPP_WD2 takes care of controlling the traffic on the bus.
RM-51
Baseband troubleshooting
Nokia Customer Care
9238460 (Issue 1)
Company Confidential
Page 6–11
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