ISR4331/K9 – 3×GE WAN/LAN Ports – 2×NIM Slots – ISR 4331 Router
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Cisco ISR4331/K9 Compatible Accessories, Modules & Spare Parts
Find compatible network modules, power supplies, fans, optics, cables and spare parts for the Cisco ISR4331/K9. These accessories support fiber connectivity, hardware replacement, spare inventory and network maintenance projects.
Optics & Cables Compatible with Cisco ISR4331/K9
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GLC-LH-SMD
1000BASE-LX/LH SFP - 10km SMF / 550m MMF - DOMOriginal price was: $2,658.11.$95.80Current price is: $95.80. Condition: New Factory Sealed -
GLC-TE
1000BASE-T SFP - RJ-45 Cat5 Copper - 100m ReachOriginal price was: $1,202.16.$62.50Current price is: $62.50. Condition: New Factory Sealed -
GLC-SX-MMD
1000BASE-SX SFP - MMF 850nm - DOMOriginal price was: $1,335.73.$57.00Current price is: $57.00. Condition: New Factory Sealed -
GLC-EX-SMD
1000BASE-EX SFP - 40km SMF - DOMOriginal price was: $5,329.57.$205.00Current price is: $205.00. Condition: New Factory Sealed -
GLC-ZX-SMD
1000BASE-ZX SFP - 70km SMF - EXT DOMOriginal price was: $10,672.47.$215.70Current price is: $215.70. Condition: New Factory Sealed
Network Modules Compatible with Cisco ISR4331/K9
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NIM-4FXO
4-Port FXO Voice - Analog NIM - Cisco 4000 ISROriginal price was: $2,808.75.$414.90Current price is: $414.90. Condition: New Factory Sealed -
NIM-2FXS
2-Port FXS Voice - Analog NIM - Cisco 4000 ISROriginal price was: $575.00.$223.20Current price is: $223.20. Condition: New Factory Sealed -
NIM-2T
2-Port Serial WAN - Smart Serial NIM - 8 MbpsOriginal price was: $1,114.86.$718.20Current price is: $718.20. Condition: New Factory Sealed -
NIM-4T
4-Port Serial WAN - Smart Serial NIM - 8 MbpsOriginal price was: $4,831.06.$897.30Current price is: $897.30. Condition: New Factory Sealed -
PVDM4-32
32-Channel Voice DSP - Motherboard or T1/E1 NIM SlotOriginal price was: $2,904.75.$267.30Current price is: $267.30. Condition: New Factory Sealed
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ISR4331/K9 Description
The Cisco ISR4331/K9 Integrated Services Router, part of the Cisco 4000 Series, is designed for secure, high-performance branch deployments. Often referred to simply as ISR 4331 or Cisco 4331 router, it provides three Gigabit Ethernet ports (two combo RJ45/SFP and one RJ45), modular expansion through 2 NIM slots, and one SM-X slot for advanced services.Supporting 100 to 300 Mbps aggregate throughput (with Performance License upgrade), the ISR4331 is ideal for mid-sized branches requiring WAN aggregation, secure connectivity, and scalable performance. With up to 16 GB DRAM, integrated power options (AC or DC), and PoE support up to 250W, the platform delivers flexibility for branch networking and converged services.
Product Highlights
Front View
|
1 |
USB Type B mini port |
2 |
Serial console port |
|
3 |
AUX port |
4 |
USB Type A port |
|
5 |
Management port |
6 |
LEDs |
|
7 |
AC Power |
|
|
Rear View
|
1 |
Double-wide NIM |
2 |
NIMs |
|
3 |
Removable module slot divider |
4 |
SM-X slot |
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5 |
Ground connection |
|
|
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Total Ports |
3 × 10/100/1000 (2 RJ45/SFP combo + 1 RJ45) |
|
NIM Slots |
2 |
|
SM-X Slot |
1 |
|
ISC Slot |
1 |
|
Default DRAM |
4 GB (up to 16 GB) |
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Default Flash |
4 GB (up to 16 GB) |
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Aggregate Throughput |
100 Mbps – 300 Mbps (licensed) |
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Power Supply |
AC or DC; Max system power 250W with PoE, 530W total |
|
Rack Units |
1 RU |
Key Features
Scalable Performance
Supports 100–300 Mbps aggregate throughput, ensuring that branch networks can start small and scale seamlessly as business traffic grows.
Flexible Modularity
Equipped with 2 NIM slots, 1 SM-X slot, and 1 ISC slot, the ISR4331 allows enterprises to integrate voice, security, storage, or WAN optimization services according to project needs.
Integrated Security
Provides advanced encryption, VPN, and firewall capabilities within the same platform, reducing the need for external security appliances and safeguarding critical enterprise data.
Optimized for Branch Deployments
Designed as a branch-edge and WAN aggregation router, ISR4331 delivers reliable connectivity for regional offices, supporting multi-service workloads and hybrid WAN strategies.
Unified Communication Readiness
Compatible with PVDM4 DSP modules, enabling voice, video, and conferencing integration for organizations adopting Cisco Unified Communications solutions.
Energy-Efficient & Compact
1RU rack-mount design with smart fan control and efficient PSU options, ensuring lower power consumption, reduced cooling needs, and space savings in branch racks.
Application Scenarios
Ideal for mid-sized branch offices requiring secure WAN aggregation, Internet access, and scalable bandwidth to support employees and cloud applications.
Widely adopted in banks, insurance firms, and retail chains where secure transactions, PCI compliance, and high reliability are crucial for business continuity.
Deployed in public sector, hospitals, and universities, the ISR4331 ensures protected data exchange, supports IP telephony, and enables converged services for critical operations.
Product Comparison
|
Feature |
ISR4331/K9 | ||
|---|---|---|---|
|
GE Ports |
2 (2 combo) |
3 (2 combo + 1 RJ45) |
3 (2 combo + 1 RJ45) |
|
NIM Slots |
2 |
2 |
3 |
|
SM-X Slot |
– |
1 |
1 |
|
ISC Slot |
– |
1 |
1 |
|
Default DRAM |
4 GB |
4 GB |
4 GB |
|
Max DRAM |
8 GB |
16 GB |
16 GB |
|
Default Flash |
4 GB |
4 GB |
4 GB |
|
Aggregate Throughput |
50–100 Mbps |
100–300 Mbps |
200 Mbps – 400 Mbps |
|
Max Power w/PoE |
125W |
250W |
500W |
|
Rack Units |
1 RU |
1 RU |
2 RU |
|
Weight |
10.6 lb |
12.25 lb |
18.5 lb |
ISR4331/K9 Supported Modules
|
Module Type / Part Numbers |
Supported on ISR4331/K9 |
|---|---|
|
Network Interface Modules (NIMs) |
Yes – 2 slots (single-wide or one double-wide) |
|
NIM-1GE-CU-SFP / NIM-2GE-CU-SFP |
Yes |
|
NIM-1MFT-T1/E1 / NIM-2MFT-T1/E1 |
Yes |
|
NIM-4MFT-T1/E1 / NIM-8MFT-T1/E1 |
Yes |
|
NIM-1CE1T1-PRI / NIM-2CE1T1-PRI |
Yes |
|
NIM-8CE1T1-PRI |
Yes |
|
NIM-ES2-8 / NIM-ES2-8-P (EtherSwitch) |
Yes (PoE requires PoE PSU) |
|
NIM-SSD / NIM-HDD (Storage) |
Yes |
|
NIM LTE / xDSL variants |
Yes (regional SKUs apply) |
|
Service Modules (SM-X) |
Yes – 1 slot for Enhanced Service Modules |
|
SM-X-ES3-16-P / 24-P / 48-P |
Yes |
|
UCS-E compute/virtualization SM |
Yes (depends on PSU/thermal capacity) |
|
Packet Voice DSP (PVDM4) |
Yes – 1 ISC slot on motherboard |
|
PVDM4-32 / 64 / 128 / 256 |
Yes |
|
Cisco UCS E-Series Server Modules |
Not supported (only on ISR 4400 series) |
|
Integrated PoE Daughter Card |
Not supported on ISR4331 front GE ports |
|
PoE via EtherSwitch NIMs/SM-X |
Supported (requires PoE PSU) |
|
Power Supply Options |
AC PSU (default), DC PSU optional |
|
Hot-Swap Dual PSU |
Not supported on ISR4331 |
|
SFP Modules |
Supported (100M/1G SFPs on combo ports) |
|
Legacy WIC/EHWIC Cards |
Not supported (only 4000-series NIM/SM-X) |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Model | Cisco ISR4331/K9 | Series | Cisco 4000 Series ISR |
| Ethernet Ports | 3 × 10/100/1000 (2 × RJ45/SFP combo, 1 × RJ45) | Management Port | 1 × GE (dedicated) |
| NIM Slots | 2 (single-wide or 1 double-wide with divider) | SM-X Slot | 1 Enhanced Service Module |
| ISC/PVDM4 Slot | 1 slot for DSP modules | USB Ports | 1 × USB 2.0 Type-A, 1 × mini-USB console |
| Console Ports | 1 × RJ-45 console, 1 × RJ-45 AUX | OS | Cisco IOS XE |
| Default DRAM | 4 GB | Maximum DRAM | 16 GB |
| Default Flash | 4 GB | Maximum Flash | 16 GB |
| Aggregate Throughput | 100 Mbps (base), up to 300 Mbps (licensed) | Encryption Throughput | Up to 100 Mbps with services enabled |
| WAN/LAN Interfaces | Provided via NIM/SM-X modules | SFP Support | 100/1000 Mbps SFPs, auto-media detection |
| Power Supply | AC (default), optional DC PSU | PoE Power Budget | Up to 250W with PoE PSU |
| Max System Power | 530W (with PoE) | Hot-Swap PSU | Not supported |
| Cooling | Integrated fan system, smart speed control | Operating Temp | 0–40 °C (32–104 °F), up to 10,000 ft |
| Humidity (Operating) | 10%–90% non-condensing | Altitude | -500 to 10,000 ft operating |
| Dimensions (H × W × D) | 1.75 × 17.25 × 17.5 in (44 × 438 × 445 mm) | Weight | Approx. 12.25 lb (5.6 kg) |
| Rack Mount | 1RU, 19-inch EIA/23-inch optional | Compliance | IEC/EN/UL 60950-1 & EN 62368-1, EMC CISPR22/24 Class A |
Get More Information
Need pricing, stock, or shipping details for the ISR4331/K9 ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
Quality Certifications
Customer Reviews
Questions & Answers
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What is ISR4331/K9 used for?
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What throughput tier does ISR4331/K9 occupy?
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How many onboard Gigabit Ethernet ports does ISR4331/K9 have?
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What expansion slots are on ISR4331/K9?
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How is ISR4331/K9 different from ISR4321/K9?
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Can ISR4331/K9 run Cisco SD-WAN?
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Is ISR4331/K9 a Catalyst access switch?
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What memory and flash are listed for ISR4331/K9?
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