User's Manual

CONFIDENTIAL

1.3 Network structure

GDM7243M network block diagram

LC4R chipset, GDM7243Q, doesn’t have WiMAX function. MII ETH is not used either due to mini

PCIe form factor, so usb0 is the only interface for network communication.

When NAT is enabled, notebook/PC will get IP from DHCP server on br0 interface, it will be like

192.168.0.10. br0 IP is 192.168.0.1. ltepdn0 IP can be retrieved by AT command or DM command

Host

Interface.

LC4R uses USB 2.0 for data communication. USB interface need to be enabled and usb

mode need to be configured for different condition.

 Connect to test board and Windows PC Auto or RNDIS mode

 Connect to Linux OS CDC-EEM or CDC-ECM mode

ACM port is a virtual port on USB for AT command access only. We suggested using this

interface for AT command because there is no console dump data which mixes with AT

command response.

Device can be found at /dev/ttyACM0.