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The Cisco PVDM4-256 is a DSP module from Cisco. DSP stands for Digital Signal Processor. These enable high-density voice connectivity within Cisco ISR Router systems.
Cisco PVDM4-256: 256-channel high-density voice DSP module, or spare -> On-board motherboard or T1/E1 module slot.
Cisco PWR-4320-AC AC Power Supply for 4320 ISR Router
Cisco ISR4321-V/K9 4321 Integrated Services Voice Router
Cisco NIM-4FXO ISR 4000 Series 4x FXO (Universal) Router Module