Cisco expansion module gige 4 ports for catalyst 3850 24 3850 48 the cisco catalyst 3850 series is the next generation of enterprise class stackable ethernet and multigigabit ethernet access and aggregation layer switches that provide full convergence between wired and wireless on a single platform ciscorsquos new unified access data plane uadp application specific integrated circuit asic powers the switch and enables uniform wired wireless policy enforcement application visibil