User Guide

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3 Interface Application
3.1 About This Chapter
This chapter mainly gives the external application interfaces of the M3Bmodule, including:
 Power Interface
 UART Interface
 USIM Interface
 USB Interface
 Control Signal
 Antenna Interface
3.2 M3B Module Interface
3.2.1 Interface Definition
The interface of the M3B module is the standard Mini PCI Express interface. For details about
the 52-pin interfaces, see table 3 I/O parameters definition.
Table 3 Definition of I/O parameters
Mark Description
IO Bidirectional input/output
DI Digital Input
DO Digital Output
AI Analog Input
uCloudlink M3B Mini PCIe-C _Hardware Design Guide_V1.0