Cisco Packet Voice Digital Signal Processor Modules (PVDMs) for Router Cisco ISR4000 Series - PVDM4-32= 32-channel DSP module - PVDM4-64= 64-channel DSP module - PVDM4-128= 128-channel DSP module - PVDM4-256= 256-channel DSP module - SM-X-PVDM-500= Up to 768-channel DSP module for 4xxx family - SM-X-PVDM-1000= Up to 1024-channel DSP module for 4xxx family - SM-X-PVDM-2000= Up to 2048-channel DSP module for 44xx family - SM-X-PVDM-3000= Up to 3080-channel DSP module for 44xx family Chi tiết xem tại: Module mở rộng cho Router Cisco ISR4000 Series (ISR4221,ISR4321,ISR4331,ISR4351,ISR4431,ISR4451)