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xN930 M.2 Hardware User Guide
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
•
1st - 4th NCM channel: data channel for PDN connection: Channel ID:
USBHS/NCM/0-3
6.5
LPM
The host computer can set the modem into USB sleep (L1) state (to save battery power)
whenever the link is idle. To return from sleep state the host computer performs
L1Resume. This can also be triggered by the modem using L1-Remote- Wake-up. The
sleep (L1) state is introduced by “USB 2.0 Link Power Management Addendum” and
allows fast state transitions between active and sleep.
6.5.1
Suspend/Resume and Remote Wake-up
The PC can set the modem into USB suspend state (to save battery power) when no
communication takes place or when the PC is switched into standby mode. The suspend
state also can be triggered by X-GOLD™ Baseband device through a proprietary device
initiated selective suspend mechanism. The wake up is performed by Host Resume. The
modem can wake up the host computer from standby state using Remote Wake-up.
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