User's Manual

L830-EA M.2 Module Hardware User Manual Page
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5.4 USB /SSIC Interface
L830-EA M.2 wireless modules support USB 2.0 and USB SSIC. While the L830-EA M.2 module insert
into the PC, the USB/SSIC interface will map one MBIM interface and one ACM interface in the PC side
on Win8/8.1/10 system. (it will display GNSS Sensor while the ACM port is installed driver ). Through the
Win8/Android switch pin can switch to three ACM ports and three NCM ports
②
. For details as follows:

Win8/8.1/10 system supports MBIM interface without extra drive. If you need to support GNSS you
should install the corresponding ACM port drive.
 Three AOM ports
③
will use for sending AT command(2 of the AOM ports) and grab software LOG
information (one of the AOM port).

Three NCM ports are virtual network ports, mainly for initiating data traffic.
Note
②:
About the Win8/Android system switch refer to the section 5.7, Android system requires the
corresponded drive is installed on PC.
Note
③
: One of the AOM port can use for Modem COM port and initiate data services. Due to the speed of
Modem COM port is too slow to up to DL 300Mbpss, so it is not suggested. The Modem COM can be
used to initiate data services temporarily only while the client`s NCM port is useless.
5.4.1 USB Interface
Pin#
Pin Name
I/O
Description
7
USB_DP
I/O
USB signal+
9
USB_DM
I/O
USB signal-
Reference Circuit Design:
Figure 5- 6 USB Interface Reference Circuit Design
T101 and T102 shall be TVS with capacitance lower than 1pF .
VUSB power supply has built connected within the module, so the VBUS PIN of Host side can be floating.
USB_D+ and USB_D- are the high-speed differential signal line, and their highest transmission rate is