Airlink101 AR420W

Overview
OEM Gemtek WRTA-108GD (WRTA-108GD_V03), see below

Per this DD-WRT forums post, the board identifier is the same as the Dell Wireless 2350 Broadband Router (WRTA-108GD) (board pictures). As such, this device is presumed to use AR2313A.

Per the manual, the default SSID is default.

Links of Interest
On the Lemmke list