The SPA2100 was discontinued by in 2006 and firmware is no longer available from Cisco. It would have been helpful to know this before I wasted my time ordering this and trying to set it up only to find that it could lock up under high network load. The version of the firmware I received on the device was a few revisions behind the last release and contained numerous bugs. The SPA-2102 is the current version of the adapter as of 10/2011.