I'm not familiar with the 180, but most other Alteon products can be recovered by reinstalling the software. You'd need to have the software image and a FTP server. Most Alteon products I know of can be access by logging in via the console with a username of boot, and password of ForgetMe. It wipes the entire config, so hopefully you have a config backup somewhere, preferably an ascii config, as I don't recall if the passwords are stored in the config file.
It might be difficult to find the software for that box since it's been unsupported for at least 3 years.