What is the Breakout Management Module and what do the values mean?

Under https:///cgi-bin/MANGA/support.cgi
I notice in B380 on FW 8.0.2 there is a setting Breakout Management Module - what is it for and if enabled what are the 4 drop down numeric boxes for?
Thank you.
HCG

Image 71

Breakout Management Module - This is a feature that allows you to set the passcode to access the LCD display on the router

Thank you.