Zoom ADSL WLAN X6 Modem/Router, Series 1046 (5590)

Support page, Full manual

Zoom's support page would imply that this entry would cover the 5590, 5590AF, and 5590BF.

Wireless module in the FCC photos is the Intersil ISL38601M, however, it may actually be the Zoom 1046JBW.