There is no username for this login but there are two passwords:
1. User Password – Allows a read-only view of the router statistics
Default Password is: user
2. Admin Password – Allows full administration of the router.
Default Password is: 1234
3. The default IP address is 192.168.1.1
Full Manual can be found at ftp://ftp.zyxel.com/P-660H-D1/application_note/P-660H-D1_3.40.pdf