Cisco NIM-PVDM-256 Full Official Technical Specification Document

1. Product Overview

Official Full Designation

Core Definition

SKU Naming Breakdown

1. NIM: Network Interface Module, single-wide expansion form factor for Cisco ISR 4000 and Catalyst 8200/8300 edge routers
2. PVDM: Packet Voice Digital Signal Processor, fourth-generation PVDM4 dedicated hardware DSP media processing architecture
3. 256: Maximum 256 concurrent active voice/media DSP channels at G.711 low-complexity codec density
4. =: Standard spare part suffix for brand-new standalone replacement kits (NIM-PVDM-256=)
5. -RF: Cisco Refresh certified refurbished spare SKU variant (NIM-PVDM-256-RF)

Product Lifecycle Notice

• Official Global Release Year: 2018
• End-of-Sale (EoS) Status: Discontinued; Cisco permanently ceased production of brand-new NIM-PVDM-256 hardware units
• Direct Upgrade Replacement Models: SM-X-PVDM series ultra-high-density DSP service modules for high-capacity ISR 4000 unified communications gateways
• Minimum Supported IOS XE Software Version: IOS XE Amsterdam 17.3.2 minimum for Catalyst 8200/8300 platforms; IOS XE 3.17S minimum for ISR 4461 routersCisco
• Software Maintenance Status: Only critical security vulnerability patches are released for customers holding active Cisco DNA Advantage or SMARTnet service contracts; no new voice media feature enhancements will be developed
• Legacy Status: End-of-sale legacy hardware; certified refurbished spare modules, validated IOS XE firmware images and 24×7 Cisco TAC engineering technical support remain available through authorized Cisco distribution partners

Supported Router Platform Compatibility

1. Cisco ISR 4400 Series: ISR4461 only
2. Cisco Catalyst 8200 Series Edge Routers: C8200L-1N-4T
3. Cisco Catalyst 8300 Series Edge Routers: C8300-1N1S-6TCisco

Deployment Restrictions

1. OIR operational requirement: Full OIR hot-swap functionality requires the minimum specified IOS XE release; older software versions require a full chassis power cycle for module installation or replacement.
2. Platform hardware limitation: Incompatible with all ISR 4300 models (4321/4331/4351) due to backplane architecture and throughput constraints.
3. Unified Communications license dependency: Voice media transcoding, multi-party conferencing, and SRTP encryption features require the Cisco Unified Communications RTU license for ISR 4461, or DNA Advantage subscription for Catalyst edge routers.
4. Dynamic shared channel resource allocation: The total 256 DSP channels operate as a single shared resource pool across all active media services (transcoding, conferencing, fax relay, SRTP encryption). Higher-complexity wideband codecs consume more DSP resources and reduce the maximum concurrent session count accordinglyCisco.
5. Backplane bandwidth sharing: Multiple NIM expansion modules installed in the same router chassis share the internal Multigigabit Fabric bus; simultaneous full-load DSP media processing plus high-speed WAN/LAN traffic may introduce minor forwarding latency under extreme concurrent load.

Standard Factory Complete Bundle Contents

1. NIM-PVDM-256 256-channel PVDM4 DSP media processing NIM expansion card with front-panel global module ENABLE status LED indicator
2. Anti-static ESD handling storage bag and protective foam packaging
3. Quick-start hardware installation guide covering ESD static protection protocols, NIM slot OIR insertion/removal procedures, IOS XE DSP resource pool configuration, codec density planning, SRST/CUBE/transcoding/conferencing feature setup command examples
4. Global regulatory compliance, safety, and electromagnetic interference (EMI) certification documentation packet

Core Integrated Functional Capabilities

1. 256-Channel Dedicated PVDM4 DSP Hardware Offload: High-performance TMS320C5515 DSP cores deliver a unified shared pool of up to 256 concurrent voice/media processing channels at standard G.711 low-complexity codec density. DSP resources are dynamically allocated across transcoding, multi-party conferencing, fax relay and secure SRTP media encryption workloads, eliminating host router CPU bottlenecks during peak VoIP call volumes and ensuring consistent high-fidelity voice quality without audio clipping, jitter-induced distortion or call dropouts. The module supports power-saving idle modes that reduce power consumption by up to 5W when DSP resources are underutilizedCisco.
2. Full Multi-Codec Hardware Universal Transcoding Support: Native hardware acceleration for all mainstream enterprise voice codecs, supporting bidirectional universal transcoding between any pair of dissimilar codecs to enable seamless interoperability between disparate network endpoints:
   • Low-complexity narrowband: G.711 a/μ-law
   • Medium-complexity narrowband: G.729AB, iLBC
   • High-complexity wideband HD voice: G.722, Opus
     Channel capacity scales with codec complexity: maximum 256 G.711 sessions, 192 medium-complexity codec sessions, 120 high-complexity wideband codec sessions per moduleCisco. The module also supports transrating for identical codec repacketization across networks with differing packetization periodsCisco.
3. Hardware-Accelerated Multi-Party Meet-Me & Ad Hoc Conferencing: Dedicated DSP-based conference bridge functionality supporting multiple concurrent meet-me and ad hoc conference sessions with integrated acoustic echo cancellation, background noise suppression, and automatic gain control (AGC). Eliminates reliance on costly external third-party conference server hardware for large branch office collaborative voice meeting and contact center conferencing workloadsCisco.
4. Comprehensive ITU-T Compliant Voice Quality Enhancement Media Features: Hardware-enabled voice optimization tools fully compliant with ITU-T G.168 standards:
   • Acoustic Echo Cancellation (AEC) supporting up to 128ms echo tail length for long-distance PSTN trunk and remote branch deployment scenarios
   • Background noise suppression and voice activity detection (VAD) with comfort noise generation (CNG) to reduce unnecessary WAN bandwidth consumption during silent call periods
   • Configurable adaptive jitter buffers (5ms to 200ms) to mitigate packet delay variation over latency-variable SD-WAN and public internet transport linksCisco.
5. AES-256 Hardware-Accelerated Secure Real-Time Transport Protocol (SRTP) Media Encryption: Integrated cryptographic acceleration engine for AES-256 SRTP VoIP media stream encryption, protecting call audio payloads from unauthorized interception and tampering over untrusted public WAN/internet transport networks. Compliant with TLS 1.2 media signaling security standards for regulated enterprise unified communications deployments (government, financial services, healthcare).
6. T.38 Fax-over-IP (FoIP) Relay with ECM Error Correction: Dedicated DSP processing for real-time T.38 FoIP fax relay, supporting Error Correction Mode (ECM) to maintain reliable, error-free fax transmission between legacy analog fax machines connected to TDM PSTN trunks and remote IP-based fax servers or cloud fax services.
7. Unified IOS XE Single-Pane CLI Media Resource Management: All DSP resource pool allocation, codec selection, transcoding policy, meet-me conference bridge provisioning, SRTP secure media encryption rules, T.38 fax relay parameters and media QoS settings are fully managed and monitored through the host ISR/Catalyst router’s native IOS XE command-line interface. Network administrators can view real-time DSP channel utilization metrics, active VoIP call session counts, codec resource consumption statistics, media packet loss/jitter measurements and DSP hardware fault alarms alongside all other router WAN/LAN/TDM trunk interface performance data within a single consistent management environment.
8. OIR Hot-Swap Maintenance Support: Compliant with Cisco Online Insertion and Removal specifications, enabling field technicians to replace or upgrade the NIM-PVDM-256 DSP media processing module without powering down the entire ISR/Catalyst edge router chassis, minimizing enterprise unified communications VoIP/PSTN voice service outage windows during hardware failure replacement or voice capacity expansion maintenance operations.
9. Comprehensive Media Diagnostic & Real-Time Monitoring Toolset: Built-in IOS XE diagnostic suite for voice media troubleshooting: real-time DSP channel utilization reporting, active call session tracking, codec resource consumption statistics, media packet loss/jitter measurement, fax relay transmission error logging, SRTP encryption status verification and conference bridge participant monitoring.
10. SNMP MIB Remote Network Monitoring Support: Implements standard Cisco PVDM DSP media processing SNMP MIBs for remote network monitoring of NIM module hardware operational status, total/active DSP channel count, real-time media processing resource utilization, codec session statistics, media transmission error counters and hardware fault alarm reporting, with SNMP trap generation triggered for critical DSP resource exhaustion and module hardware fault conditions.

2. Hardware & Performance Specifications

Core DSP Media Processing Capacity Specifications

DSP Architecture & Channel Density

• DSP Core Type: Texas Instruments TMS320C5515 fourth-generation PVDM4 DSP cores
• Total Maximum DSP Channels (G.711 low complexity): 256 concurrent active sessions
• Medium-complexity codec maximum sessions (G.729AB/iLBC): 192 concurrent sessions
• High-complexity wideband codec maximum sessions (G.722/Opus): 120 concurrent sessions
• Dynamic Resource Allocation: Shared unified DSP pool for transcoding, conferencing, FoIP fax relay, SRTP encryption and voice quality processingCisco

Supported Voice & Fax Codecs

• Narrowband Voice Codecs: G.711 a-law / μ-law, G.729AB, iLBC
• Wideband HD Voice Codecs: G.722, Opus
• Fax Relay Standard: T.38 FoIP with ECM error correction

Voice Media Enhancement Parameters

• Acoustic Echo Cancellation (AEC) Tail Length: Up to 128ms, ITU-T G.168 compliant
• Adaptive Jitter Buffer Configurable Range: 5ms – 200ms
• Integrated Voice Optimization Functions: Background noise suppression, VAD voice activity detection, comfort noise generation (CNG), automatic gain control (AGC)

Secure Media Encryption

• Encryption Standard: AES-256 hardware acceleration for SRTP voice media streams
• Signaling Security Compliance: TLS 1.2

Front Panel LED Indicator Definitions

1. EN LED (Global Module Hardware & DSP Pool Operational Status)
   • Off: No power supplied to the NIM-PVDM-256 module, improperly seated module or critical DSP hardware failure rendering all media processing functions offline
   • Solid Green: NIM module powered, detected and fully operational; all DSP cores initialized and the 256-channel media resource pool available for unified communications workloads
   • Blinking Green: Module undergoing IOS XE DSP hardware initialization during router boot sequence
   • Solid Amber: NIM DSP hardware fault detected, or DSP resource pool near full exhaustion threshold alarm triggered

Electrical & Thermal Specifications

Power Consumption

• Typical operating power draw under medium mixed transcoding/conferencing voice load: ~14 Watts typical total module power dissipation
• Maximum full-load power consumption with all 256 DSP channels active at peak media processing load: ≤16 Watts maximum full-load thermal dissipation
• Power Delivery: Powered exclusively through the ISR 4461 / Catalyst 8200/8300 router chassis NIM slot internal backplane bus; no external power supply connectors mounted on the NIM module hardware

Thermal & Environmental Operating Parameters

• Certified Continuous Operating Temperature Range: 0°C to 40°C (32°F to 104°F) standard enterprise datacenter equipment room environment
• Extended Short-Term Operating Temperature Range: -5°C to 70°C (23°F to 158°F) commercial wide-temperature operating range
• Non-operating Storage Temperature Range: -40°C to 70°C (-40°F to 158°F)
• Operating Relative Humidity: 10% to 85% RH, non-condensing operating environment
• Storage Relative Humidity: 5% to 95% RH, non-condensing non-operating storage
• Operating Altitude: Certified operational range -150 m to 2,000 m (-500 ft to 6,500 ft); extended validated range up to 3,000 m (10,000 ft)
• Cooling Design: Fully passive thermal dissipation architecture with integrated aluminum heatsink, no onboard rotating cooling fans; cooling airflow supplied by the host router’s internal chassis fan assembly
• Airflow Direction: Horizontal chassis airflow passing over the NIM module PCB and integrated heatsink for continuous thermal dissipation under full 256-channel DSP peak media processing load

Physical Form Factor & Weight

• Form Factor: Standard single-wide NIM network interface module expansion card form factor, designed exclusively for NIM dedicated expansion slots of Cisco ISR4461 and Catalyst 8200/8300 Series multiservice secure edge routers
• Bare NIM Module Net Weight (without accessories, cables and packaging): Approximately 300 grams (0.30 kg)
• Physical Dimensions (H × W × D): 32 × 89 × 184 mm (1.25 × 3.50 × 7.24 inches)

3. Regulatory & Compliance Certifications

1. Safety Standards: UL 60950-1, CSA C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, GB 4943 Chinese national safety standard
2. EMC & EMI Standards: FCC CFR Title 47 Part 15 Class A, VCCI Class A ITE, EN55022 Class A, CISPR 22 Class A, ICES-003 Class A, CISPR 24, EN 61000 series electromagnetic immunity standards
3. Voice Media & Telephony Compliance: ITU-T G.168 echo cancellation, ITU-T G.711/G.729/G.722 voice codecs, T.38 FoIP, SRTP RFC secure voice media specifications
4. Environmental Directive: EU RoHS hazardous substance restriction compliance, WEEE electronic waste recycling directive compliant

4. Core Deployment Advantages

1. Ultra-High-Density 256-Channel Dedicated DSP Hardware Offload Eliminates Router CPU Bottlenecks for Large-Scale Enterprise Unified Communications: The NIM-PVDM-256 delivers an independent dedicated shared DSP resource pool of 256 voice channels, offloading all CPU-intensive voice transcoding, multi-party hardware conferencing, long-tail acoustic echo cancellation, noise suppression and AES-256 SRTP secure media encryption workloads from the host router’s main control and forwarding plane CPU. This preserves critical router CPU capacity for core enterprise edge workloads including dynamic IP routing, stateful zone-based firewall inspection, NAT/PAT address translation, IPSec/SD-WAN VPN encryption and ACL security filtering, preventing voice quality degradation, audio clipping, jitter-induced call dropouts and media latency spikes during peak concurrent VoIP and WAN traffic loads for large branch office, regional contact center and hybrid cloud Webex unified communications deployments.
2. Dynamic Shared Unified DSP Resource Pool Maximizes Voice Channel Utilization and Reduces Hardware Capital Expenditure: The module’s full 256 DSP channels operate as a single dynamically shared resource pool that automatically allocates processing resources across all active media services simultaneously – codec transcoding, multi-party meet-me conferencing, T.38 fax relay and SRTP media encryption. Network administrators are not required to statically partition fixed DSP channel counts for individual UC functions, which drastically improves overall DSP resource utilization efficiency. This flagship high-density 256-channel single-slot DSP NIM minimizes the total number of voice DSP expansion modules required to support large-scale branch office concurrent VoIP call volumes, lowering enterprise hardware capital expenditure, rack space consumption and auxiliary power distribution overhead for distributed multi-branch UC networks.
3. Comprehensive Hardware-Accelerated End-to-End Unified Communications Media Feature Suite Meets Full Enterprise VoIP Deployment Requirements: This PVDM4 ultra-high-density DSP module delivers the complete suite of enterprise-grade voice media processing functions fully implemented in dedicated hardware acceleration, eliminating performance variability and poor voice quality associated with software-only media processing under heavy concurrent call loads. Native universal multi-codec transcoding enables seamless interoperability between on-premises CUCM IP phones, legacy TDM PSTN trunk telephony, remote SRST branch endpoints and cloud-hosted Webex Calling clients; integrated hardware meet-me conference bridges eliminate costly external third-party conference server hardware for large-scale branch collaborative voice meeting and contact center workloads; built-in 128ms long-tail AEC echo cancellation, noise suppression and adaptive jitter buffering guarantee consistent high-fidelity voice quality over latency-variable SD-WAN and public internet transport links, while AES-256 hardware SRTP media encryption secures all VoIP audio streams against unauthorized interception for regulated industry deployments (government, financial services, healthcare).
4. OIR Hot-Swap Support Minimizes Business-Critical VoIP/PSTN Voice Service Maintenance Downtime: Native Online Insertion and Removal hot-swap functionality allows field technicians to replace or upgrade the NIM-PVDM-256 DSP media processing module without powering down the entire ISR/Catalyst edge router chassis. This eliminates extended branch office voice service outages required for full chassis power cycles during DSP module hardware failure replacement or unified communications voice capacity expansion maintenance operations, drastically improving availability for mission-critical enterprise branch VoIP, PSTN trunk telephony, regional contact center and collaborative conferencing workloads.
5. Single-Wide NIM Form Factor Maximizes Chassis Expansion Slot Efficiency for Fully Converged Single-Chassis Branch Edge Routers: The NIM-PVDM-256 fits within a standard single-wide NIM expansion slot, delivering flagship ultra-high-density 256-channel dedicated DSP voice media processing capacity without consuming multiple router chassis expansion slots. This space-efficient design preserves remaining NIM expansion slots for other critical branch edge services including T1/E1 MFT voice trunk modules, Gigabit/10G high-speed WAN interface modules, LAN EtherSwitch modules and LTE wireless WAN NIMs, enabling fully converged single-chassis branch edge router deployments that integrate enterprise routing, SD-WAN, network security, LAN switching and full high-density unified communications voice media processing functionality within a single router chassis, reducing total branch IT rack space footprint and auxiliary hardware capital expenditure for distributed enterprise networks.
6. Passive Fanless Aluminum Heatsink Thermal Architecture Delivers Superior Long-Term Hardware Reliability and Low Lifecycle Maintenance Costs: The NIM-PVDM-256 module utilizes a fully passive thermal dissipation design with a solid integrated aluminum heatsink and contains no onboard rotating cooling fans. This eliminates all mechanical hardware failure risks associated with fan motor wear, dust accumulation, fan power supply faults and airflow blockages, enabling stable 24/7 continuous unattended operation in remote unmanned enterprise branch datacenter equipment closets, retail store IT rooms, industrial field sites and off-grid regional branch office locations with minimal long-term on-site maintenance requirements. Low idle and peak full-load power consumption reduces overall router chassis energy draw and enterprise branch site cooling operational energy costs over multi-year hardware service lifecycles, delivering significant total cost of ownership (TCO) savings for large-scale distributed multi-branch enterprise unified communications deployments.
7. Unified IOS XE Single-Pane CLI Media Resource Management Simplifies Branch UC Operations and Troubleshooting: All DSP resource pool configuration, codec selection, transcoding policy, meet-me conference bridge provisioning, SRTP secure media encryption rules, T.38 fax relay parameters and media QoS settings are fully managed and monitored through the host ISR/Catalyst router’s native IOS XE command-line interface. Network administrators can view real-time DSP channel utilization metrics, active VoIP call session counts, codec resource consumption statistics, media packet loss/jitter measurements and DSP hardware fault alarms alongside all other router WAN/LAN/TDM trunk interface performance data within a single consistent management environment. This eliminates the requirement for separate standalone media server management software or dedicated out-of-band monitoring infrastructure for branch voice processing resources, drastically reducing network administrator training overhead and streamlining unified communications change management, routine performance monitoring and critical VoIP service troubleshooting workflows for distributed enterprise branch edge routers.

Supplementary Product Specification Notes

UNSPSC Classification Code

K9 Security Compliance Note

Factory Hardware Warranty Terms