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L810-MiniPCIeHardware User Manual
Page 16 of 26
5 Interface Application
5.1 USB Interface
5.1.1 USB Interface Description
Pin
Pin name
I/O
Pin description
Voltage range
36
USB_D-
I/O
USB D- signal
0.3---3V
38
USB_D+
I/O
USB D+ signal
0.3---3V
L810-MiniPCIe supports USB 2.0 and is compatible with USB1.1. The corresponding USB driver shall be
installed according to the Windows system before it can be used in PC.
After L810-MiniPCIe is inserted into PC, the USB driver will map 3 COM ports and 3 NCM ports on the
Windows system, which are shown as follows:
Two COM ports can be used to send AT Commands
One COM port can be used to capture LOG information for debugging software
Three NCM ports are virtual network ports, which can be used to initiate the data service
Note:
One COM port can be used for Modem COM port to initiate the data service. Since the speed of
Modem COM port is not sufficient for the 150Mbps downlink speed requirement for LTE, so it’s
not recommended to be used. Modem COM port can only be used to initiate data service in the
case that NCM port can’t be used.
