Yes, both the Sierra Wireless GX400 and 440 support the use of X-Cards. The expansion card slot is designed to greatly increase the versatility of the platform.
- WiFi XCard that will enable a WiFi (802.11 b/g/n) hotspot (access point) and support WiFi client mode
Two additional X-Cards are slated to be released in 2012. These cards will
- Support additional Ethernet Ports
- Expand I/O (inputs and outputs)