The Cisco NM-HDV (High-Density Voice/Fax Network Module) is a voice-enabled network module for Cisco routers that enables VoIP (Voice over IP) and fax communication over IP networks.
It acts as a carrier platform for DSP (PVDM) modules and voice interface cards (VIC/VWIC), converting traditional voice and fax signals into IP packets for transmission across LAN, WAN, or service provider networks.
This module is commonly deployed in enterprise voice gateways, branch office routers, and legacy IP telephony systems, particularly in Cisco 2600, 3600, and 3700 series routers.
Key Features
- Supports high-density VoIP and fax processing
- Scalable from ~6 up to 60 voice/fax channels depending on DSP modules
- Carrier module for PVDM DSPs and VIC/VWIC cards
- Converts analog/digital voice signals into IP packets (VoIP)
- Supports industry-standard codecs:
- G.711, G.729, G.723.1, G.726, G.728
- Enables fax relay and voice compression
- Compatible with Cisco IOS voice features (H.323, VoIP gateway)
- Flexible configurations for:
- Analog voice (FXS/FXO)
- Digital trunks (T1/E1 PRI/CAS)
- Used for PSTN connectivity, PBX integration, and SIP/VoIP migration
Technical Specifications
- Part Number: NM-HDV
- Product Type: High-Density Voice/Fax Network Module
- Voice Channels:
- Up to 60 channels (medium complexity codecs)
- DSP Support:
- Up to 5 × PVDM modules (voice DSP processing)
- Expansion Slots:
- 1 × VIC/VWIC slot for voice/trunk interfaces
- Supported Interfaces:
- T1/E1 trunks
- Analog FXS/FXO
- ISDN/BRI (via interface cards)
- Protocols: H.323, VoIP (Cisco IOS dependent)
- Router Compatibility:
- Cisco 2600 / 2600XM
- Cisco 3600 / 3700 series
- Form Factor: Network Module (NM slot)
- Use Case: VoIP gateway, voice trunking, PBX integration
90 DAY'S
