Q: Why is the tty test-key command not found on the port sometimes?
A: Consider the troubleshooting of dumb terminal into two parts. The part from the terminal to the router is not related to data configuration generally. If the cables have no problems, configure tty test-key 13 on the port and press Enter on the terminal to display terminal ok! However, the tty test-key command cannot be found usually in debugging. You should configure the async mode tty 0 0 1 command on the port beforehand.
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