Zytel P-660HW Wireless ADSL modem

address:  192.168.1.1

default password:  1234

It asks you to change the password after logging in.

1.  Go to Wizard Setup

• Mode:  Routing
• Encapsulation:  PPPoE (Ethernet for a static IP)
• (If it's a static IP, after entering it, go to Change Lan Configuration to enter DNS)
• Multiplex:  LLC
• VPI/VCI:  0/35 (automatically detected)
• Next
• Choose Nailed Up Connection (always-on) for PPPoE
• Apply

2.  Wireless

• Go back to Main Menu
• Click Wireless LAN
• 802.1x/WPA
• Authentication Required
• Enter pre-shared key
• Apply

3. Click Wireless

• Enter the SSID
• randomly pick channels 1, 6 or 11
• Apply

If you need to reset to factory defaults, it's under Maintenance, Firmware.