Found this online:
I recently got Rogers Extreme Plus Package, I got the SMCD3GN, to make a long story short I had to do a reset and could no longer get into the router config using the default cusadmin / password combo... I searched for hours and found these.
User name: cusadmin Password: password
User name: rogcesadmin Password: wra8uje
User name: mso - Password: msopassword
User name: mso - Password: cxf1rst!
User name: rogcesadmin - Password: nas00Rn7TU - WORKING AS OF JAN 30 2012
Nothing worked, triied every possible combination... so I brokedown and install the origional cd that came with the package, after install it asked to setup the wireless SSID and password, which I entered.
For the hell of it I triied to enter the smc again going to the default 192.168.0.1 using cusadmin / password and it worked!!! I was able to get back into the router config.
and this: Manual
»www.smc.com/files/AB/SMCD3GN_Wir ··· nual.pdf