Because certain modules allow more than a single Shift, there is an added “pages versus buttons per module” aspect.
Modules with more than two pages in the hardware are mapped as using three pages in Communication Manager. However, as the modules were “one expansion module per station,” this does not change the available number of buttons. Administrators must consider this.
The 8-button DBA for the 39XX with the Shift key integrated into the module is physically a single-page 24 button module, and not an 8 button three-page module. However, the administration of the expansion module uses three pages of 8 buttons.
