We are currently using a Norstar Plus Modular ICS fiber system. But we own alot of copper 2 port and 6 port expansion cartridges, MOX16, M12X0, and DID devices. I know that we cannot connect the 2 and 6 port expansion cartridges in the ICS that we are using, but could we still use the M0X16, M12X0, and DID cartridges if we buy a fiber 6 port expansion module? Or does all of the cartridges and modules have to be the fiber type?