Lexmark Optra S1625 User Manual page 308

Installing Options
292
Output Expanders
The Link setting allows for bin linking. Bin linking causes all the
output bins (standard bin and output options) to be linked
together as though they are one large bin. The printer fills the
Standard Bin first. When it is full, the printer starts filling the first
output option. As each output option is filled, the printer switches
to the next installed output option. When the standard bin and all
output options are full, the printer issues the Remove Paper All
Output Bins message.
The Link Optional setting causes all output options to be linked
together as though they are one large bin, while leaving the
Standard Bin individually addressable. The printer fills the default
output bin first. When it is full, the printer switches to the next
installed output option. When all output options are full, the
printer issues the Remove Paper All Output Bins message.