LN930 M.2 Hardware User Guide
1VV0301078 Rev.10 – 2015-11-11
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 57 of 88
6.3
USB 2.0 HS Features
The USB 2.0 HS stack is used for communication with a PC in device role.
Additional details on the USB interface can be found in Section 3.1, Interprocessor Interface.
6.4
USB Configuration
The USB feature may be configured by the UTA_USB API. The user may define different
use cases, such as support of different numbers of CDC-ACM or CDC-NCM channels.
6.4.1
Modem Connection
Up to 3 CDC-ACM logical channels are available to be used as an interface for the
following functionality:
•
AT commands
•
3GPP 27.010 Multiplexer
•
Tracing
•
Connection to test framework
The ACM channels are connected via UTA-Terminal to S-IO and from there via UTA-
Serial to the application on modem side.
6.4.2
Network Connection
Up to 4 CDC-NCM functions are available to be used as interface for network
connections servicing for up to four PDN connections.
The NCM channels are connected via the PBM driver interface to PBM and from there via
PBM service interfaces to the PTM component of C-PS.
6.4.3
Default Configuration
The default configuration is 3 CDC-ACM channels for control and trace and 4 CDC–
NCM channels for data connections. A specific configuration is set via the AT+XSIO
command. The detailed usage of the default configuration is:
•
1st ACM channel:: Modem Control Channel, Channel ID: USBCDC/0
•
2nd ACM channel:: Trace data, Channel ID: USBCDC/1
•
3rd ACM channel:: free, Channel ID: USBCDC/2
