3Com 3CR17561-91-US - Switch 4500 26PORT Managed 24 10/100 2 Gbe Stackable RJ45 Getting Started Manual - page 61
Manual is about: Getting Started Guide
of
128
Default Users and Passwords
61
Use the admin default user name (no password) to login and carry out
initial Switch setup.
To set a password for the admin user in the CLI, enter the following from
system view:
[4500]local-user admin
[4500-luser-admin]password simple xxxxxxxx
(where xxxxxxxx is your chosen password).
Save the configuration in the User View.
For information on the lost password procedure please refer to the
Configuration Guide that is supplied with your Switch.