Black Box 16 port User Manual page 85

CHAP challenges a client/device at regular intervals to validate itself with a
username and a response, based on a hash of the 'secret' (password). A timer
operates during which successful authentication must take place. If the timer expires
before the remote end has been authenticated successfully the link will be terminated.
With both PAP and CHAP make sure the unit and the remote client/device have the
same setting. e.g. if the unit is set to PAP but the remote end is set to CHAP the
connection shall be refused.
In the cli, to turn on PAP (for example) the syntax would be:
set ppp li 7 security pap
If you have selected a line service of 'cslogin', PAP or CHAP will not take place
since the user will have already been authenticated. In this case setting security to
PAP or CHAP will have no effect.
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Black Box Console Server user guide