From the BCM install guide.
"The fiber expansion module (FEM) allows you to connect a maximum of six Norstar expansion
modules to a Business Communications Manager. Each FEM connection requires one DS30
channel, therefore, the Business Communications Manager used for this purpose can only support
one FEM module if you are converting a fully-configured Norstar system."
Thats not my fastball, thats my hurry up and get by you pitch... Satchel Paige