Cisco NM-HDV2-2T1/E1 2-Port T1/E1 High-Density Voice Network Module 3825 3845 NMHDV22T1/E1

Description:

The Cisco NM-HDV2-2T1/E1 High-Density Voice Network Module is used in Cisco Integrated Services Routers to provide digital voice trunk connectivity through two T1 or E1 interfaces for enterprise and service provider voice networks. This network module enables routers such as the Cisco 3825 and 3845 to function as voice gateways, connecting IP telephony systems to traditional PSTN or PBX infrastructure using channelized digital voice circuits. The module supports high-density voice processing and can host digital signal processor (DSP) resources required for voice transcoding, conferencing, and call processing functions. Its dual-port T1/E1 interfaces allow flexible configuration for PRI or channelized voice services, enabling integration between VoIP networks and legacy telephony systems. Designed for scalable voice deployments, it allows enterprises to expand unified communications infrastructure while maintaining compatibility with existing telecom services. Telecom engineers, network administrators, and system integrators commonly install this module for voice gateway deployments, PSTN connectivity, telephony infrastructure upgrades, and replacement of existing voice interface modules.

Applications:

The Cisco NM-HDV2-2T1/E1 module is widely deployed in enterprise voice gateway environments where IP-based communication systems must interconnect with traditional telephone networks. It is commonly installed in Cisco 3825 and 3845 routers to provide digital trunk connectivity for VoIP deployments, call centers, and unified communications systems. Organizations use this module in corporate offices, telecommunications facilities, and distributed enterprise networks to enable PRI-based connectivity with service providers or legacy PBX systems, ensuring reliable voice communication between IP telephony platforms and PSTN networks. 

Technical Specifications:

• Brand: Cisco
• Part Number: NM-HDV2-2T1/E1
• Model Number: NMHDV22T1/E1
• Product Type: High-Density Voice Network Module
• Interface Ports: 2 × T1/E1 digital trunk ports
• Interface Type: Channelized T1/E1 with PRI support
• Connector Type: RJ-48C
• Compatibility: Cisco 3825 and Cisco 3845 Integrated Services Routers
• DSP Support: Supports onboard DSP modules for voice processing
• Voice Features: VoIP gateway support, transcoding, conferencing, and call processing
• Installation Type: Network module slot installation in router chassis
• Management: Configured and managed through Cisco IOS software
• Deployment Environment: Enterprise voice gateways and telecommunications networks

Common Replacements:

• Cisco NIM-2CE1T1-PRI Multi-flex Trunk Module
• Cisco VWIC3-2MFT-T1/E1 Voice Interface Card
• Cisco NIM-4MFT-T1/E1 Multi-flex Trunk Module