Allied Telesis AT-9448Ts/XP (Basic Layer 3) - Manual (Page 53)

AT-9400Ts Stack Installation Guide
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5. If the switch is new, the user name is “manager” and the default
password is “friend“. If the switch was used as a stand-alone unit in
your network, enter the appropriate user name and password for
manager access. The user name and password are case sensitive.
Go to the next procedure to verify the version number of the AT-S63
Management Software on the unit.