try using '}' as a username without a password for cayman routers.

login: }
Password:

Terminal shell v1.0
Cayman-DSL Model 3220-H, DMT-ADSL (Alcatel) plus 4-port hub
Running GatorSurf version 5.3.0 (build R1)
(} completed login: user level)

Cayman-DSL{SNIP}>
==================================
Russell Handorf
a.k.a. a deity called alphonzo