The Cisco Digital Modem PVDM Modules are a set of digital dial modems provided in a DSP form-factor for use in the on-board PVDM slots. They are designed to enhance dial access for the Cisco 2800 and 3800 Series Integrated Services Routers. The Cisco Digital Modem PVDMs provide the Cisco 2800 Series with low-density digital dial access, and they provide the Cisco 3800 Series with a higher-density digital dial platform.