it's been a while since i have done this so i may have it a bit wrong...
first i would change your PC/laptop IP address to 10.10.10.2
then connect using a ethernet cable to LAN 1
open up the internet browser and in the address bar type 10.10.10.1 hopefully this will give you the front screen, then go to administrator applications ( i think ) and download Element Manager.
if that works.. remove the cable, change your IP address on your pc/laptop to 10.10.11.2 and connect to the OAM port, that is the first port from the left hand side.then go to start/programs/nortel/and run element manager, if that works you will then need to create a new connection,at the top you will select network/new network element, you will then be prompted for an IP address enter 10.10.11.1, login is nnadmin password is PlsChgMe! (uppercase P C M )i think thats about it...
give that a go and post back