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increasing the total number of buttons when you add one or two Cisco Unified Expansion Modules 7914
the Cisco Catalyst 3750-X switches also offer:
Fully tested with warranty
Foot stand
For wireless products
Cisco Module PVDM3-256 PoE increasing the total number ofPVDM Overview and Functionality General Information: Fully refurbished and tested. What is a PVDM? What function does it provide on the Cisco Integrated Service Routers? A Packet Voice Digital Signal (PVDM) is a hardware module that provides digital signal processor (DSP) resources to the system. A PVDM module can be populated with one or more DSPs. The DSP resources on a PVDM module provide collaboration services including voice sessions, transcoding