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.
36PT DIGTL MODEM MOD 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.