Cisco ISR4331-DC/K9 Full English Product Description

Product Overview

Core Hardware Interfaces & Expansion Slots

Fixed Built-in Ports

• 1× Combo Gigabit Ethernet port (shared RJ45 copper / SFP fiber slot)
• 1× Dedicated GE RJ45 LAN/WAN port
• 1× Dedicated GE SFP fiber uplink port
• 1× USB 2.0 Type-A port for zero-touch provisioning and external storage
• Dual management console: Mini-USB Type B + RJ45 serial console
• RJ45 auxiliary port for out-of-band remote management

Expansion Slots

• 2× Hot-swappable NIM (Network Interface Module) slots for T1/E1, xDSL, serial leased lines or low-density switching modules
• 1× Single-wide SM service module slot for voice DSP blades, routing acceleration or switching extensions
• 1× Internal ISC slot for crypto acceleration and PVDM4 digital signal processors for VoIP workloads

Memory & Processing

• Separated multi-core CPU architecture (independent data, control and services planes to avoid performance contention)
• Default configuration: 4 GB ECC DDR3 DRAM, expandable up to maximum 16 GB
• Default storage: 4 GB industrial flash memory, upgradable to 16 GB for IOS XE images, logging and virtual workloads

Throughput Performance

• Base unlicensed aggregate throughput: 100 Mbps
• Performance license upgrade unlocks 300 Mbps routing throughput
• Boost license delivers up to 2 Gbps encrypted VPN throughput for heavy security and SD-WAN traffic

Critical DC Power Specifications (Key Difference from ISR4331/K9)

• Integrated single DC power supply, no redundant power support on ISR4331 chassis
• DC input range: 24 VDC ~ 60 VDC (standard -48V telecom negative ground power)Cisco
• Maximum power rating: 250W total chassis power consumption
• Important hardware restriction:PoE-capable NIM/SM modules cannot be deployedwhen using DC power supply due to limited power budgetCisco
• NEBS Level 3 compliant for carrier-grade telco rack installations
• Form factor: Standard 1RU rack-mount chassis with included mounting brackets

Integrated Functional Capabilities

1. Cisco IOS XE SD-WAN & Intelligent WAN (IWAN)

2. Hardware-Accelerated Enterprise Security

• AES-256 hardware IPsec / SSL VPN encryption engine
• Zone-based policy firewall, embedded IPS, URL filtering and malware threat defense
• Trustworthy Systems secure boot, runtime image integrity validation, FIPS 140-2 certified crypto modules
• Direct secure internet breakout to reduce central data center backhaul pressure

3. Unified Communications (UC)

4. NFV Edge Virtualization

5. Modular OIR Upgrades

Software & Licensing

• Operating System: Modular modernCisco IOS XE
• Base IP Base feature set pre-installed: static routing, OSPF, EIGRP, basic NAT and ACL functions
• Optional subscription add-on licenses: Performance Boost, Security, SD-WAN, DNA Advantage, Unified Communications
• Lifecycle note: ISR4331 series has reached End-of-Life; official Cisco TAC support ends November 30, 2028. Recommended replacement: Cisco C8200 series DC-powered edge routers.

Primary Deployment Scenarios

1. Telecom central office remote branches with standard -48V DC power racks
2. Utility, railway, mining and industrial field sites relying on DC power infrastructure
3. NEBS-compliant carrier edge and colocation deployments
4. Secure hybrid WAN branch offices requiring integrated routing, VPN and voice services
5. Remote industrial IoT edge aggregation without PoE endpoint requirements

Core Distinction Summary vs ISR4331/K9