REFURBISHED
Cisco
Cisco C3KX-NM-10G Refurbished 4-Port 10G SFP+ Network Module
MPN: C3KX-NM-10G
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Lifetime
Warranty
ISO 9001
Certified Testing
R2v3
Responsible Refurb
25+
Years
5K+
Customers
ISO
Certified
✓
Tested
Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.
Tested to factory specification. Backed by 25 years of enterprise trust.
This professionally tested, refurbished Cisco C3KX-NM-10G is a 4-port 10 Gigabit Ethernet uplink network module purpose-built for the Cisco Catalyst 3750-X and 3560-X Series switches. The module features four physical slots arranged in two pairs: two dedicated 1GbE SFP slots and two dual-mode slots that accept either 1GbE SFP or 10GbE SFP+ transceivers — enabling up to two simultaneous 10GbE uplinks. Every unit ships reset to factory defaults and accompanied by a certificate of testing.The C3KX-NM-10G is designed for maximum deployment flexibility. The SFP+ ports support both 10GbE and 1GbE transceivers, allowing organizations to protect their existing SFP optics investment while upgrading to 10G speeds on demand — without replacing the access switch itself. All four ports are hot-swappable, supporting insertion or removal without disrupting switch operation. The module accommodates both copper and fiber transceiver types and is compatible with Cisco IOS Software 12.2(53)SE2 or later, including the IOS 15.x train. Supported configurations include four 1Gb SFP uplinks, two 10Gb SFP+ uplinks, or a mixed combination.
At $29.99, the WhaleyComm refurbished C3KX-NM-10G delivers a proven 10GbE uplink expansion path for Catalyst 3750-X and 3560-X deployments at a fraction of the new-unit cost. Backed by our Lifetime Warranty and ISO 9001-certified testing process, this is enterprise-grade uplink performance without the enterprise price tag.
Technical Specifications
Part Number
C3KX-NM-10G
Product Type
Network Uplink Module
Total Physical Ports
4
10GbE SFP+ Ports
2 (dual-mode slots, support 1GbE SFP or 10GbE SFP+)
1GbE SFP Ports
2 (dedicated 1GbE SFP slots)
Maximum Simultaneous 10G Uplinks
2
Port Architecture
4 ports in 2 paired sets; 10G SFP+ and 1G SFP in same pair cannot operate simultaneously
Hot-Swappable
Yes
Compatible Switches
Cisco Catalyst 3750-X Series, Cisco Catalyst 3560-X Series
Compatible Switch Configurations
24-port and 48-port Catalyst 3750-X / 3560-X models
Transceiver Support
Cisco 1GbE SFP (copper and fiber), Cisco 10GbE SFP+ (copper and fiber)
Minimum IOS Version
Cisco IOS 12.2(53)SE2
Jumbo Frame Support
9216 Bytes (host switch)
Power Consumption
30W maximum
Dimensions / Weight
1U module, fits Catalyst 3750-X and 3850 series chassis
Operating Temperature
0 to 45 degrees C (32 to 113 degrees F)
Ideal Use Cases
Access Layer 10G Uplink Upgrade
Add up to two 10GbE uplinks to an existing Catalyst 3750-X or 3560-X switch without replacing the chassis, extending the life of deployed access-layer infrastructure.
Mixed-Speed Uplink Environments
The module's dual-mode SFP+ slots support both 1GbE SFP and 10GbE SFP+ transceivers simultaneously across its four ports, allowing teams to mix uplink speeds based on current and future requirements.
Campus Distribution Layer Connectivity
Provide high-throughput uplinks from access switches to distribution-layer switches or routers, reducing congestion on oversubscribed 1G uplink paths in campus networks.
Data Center Edge Connectivity
Connect Catalyst 3750-X stacks to top-of-rack or aggregation switches using 10GbE fiber or DAC copper transceivers for low-latency, high-bandwidth server-side paths.
Lab and Test Environment Buildout
Cost-effective option for IT labs, training environments, or proof-of-concept deployments requiring 10GbE switching capability on Catalyst 3750-X or 3560-X platforms.
Staged 10GbE Migration
Organizations migrating from 1G to 10G can deploy the C3KX-NM-10G to begin the transition incrementally, protecting existing 1GbE SFP investments while adding 10G capacity on demand.
What's Included
Cisco C3KX-NM-10G 10G Network Uplink Module
Certificate of testing and factory reset
WhaleyComm Lifetime Warranty certificate
Lifetime Warranty — No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. We have stood behind our hardware for 25 years and 5,000+ customers — that is not a marketing line, it is our operating standard.
Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
✓
Compatible Host Switches
✓
Cisco Catalyst 3750-X Series (24-port and 48-port models)
✓
Cisco Catalyst 3560-X Series (24-port and 48-port models)
✓
Compatible Transceiver Types (SFP — 1GbE slots)
✓
Cisco SFP-GE-S (1000BASE-SX, multimode fiber)
✓
Cisco SFP-GE-L (1000BASE-LX/LH, single-mode fiber)
✓
Cisco GLC-T (1000BASE-T, copper)
✓
Cisco GLC-SX-MMD and other Cisco-qualified 1GbE SFP modules
✓
Compatible Transceiver Types (SFP+ — 10GbE dual-mode slots)
✓
Cisco SFP-10G-SR (10GBASE-SR, multimode fiber)
✓
Cisco SFP-10G-LR (10GBASE-LR, single-mode fiber)
✓
Cisco SFP-H10GB-CU1M / CU3M / CU5M (10G Direct Attach Copper)
Other Cisco-qualified 10GbE SFP+ modules (consult Cisco 10GE Transceiver Compatibility Matrix)
✓
Software
✓
Cisco IOS 12.2(53)SE2 minimum
✓
Cisco IOS 15.2(x) recommended for full 10G feature support
Note: Non-Cisco SFP/SFP+ modules may not be recognized without the service unsupported-transceiver IOS command. For compatibility verification specific to your environment, contact our engineering team: +1 214 607-4800 or sales@whaleycomm.com
Shipping & Returns
Clear fulfilment, tracking, return, warranty, and support information for enterprise hardware orders.
Shipping
Orders typically ship within 1-2 business days after payment confirmation. Tracking details are shared once the order has been dispatched.
Returns
Eligible products can be returned according to WhaleyComm's return policy. For DOA, warranty, or product-related issues, contact the support team for replacement or resolution.
Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
The C3KX-NM-10G is designed exclusively for the Cisco Catalyst 3750-X and 3560-X Series switches, including both 24-port and 48-port configurations. It is not compatible with other Catalyst switch families. Always verify your specific switch model and IOS version before installing.
No. The module provides four physical slots in two paired sets. Each pair shares one 10GbE SFP+ slot and one 1GbE SFP slot, and both ports within a pair cannot operate at the same time. The maximum number of simultaneous 10GbE connections is two. The remaining slots operate at 1GbE using standard SFP transceivers.
Cisco documentation confirms a minimum IOS version of 12.2(53)SE2 for 10GbE transceiver support. Cisco IOS 15.2 or later is recommended for full feature compatibility and stability. Verify your host switch IOS version prior to module installation.
Yes. Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it at no cost — no time limits, no questions asked.
Every unit goes through our ISO 9001-certified testing process: full power-on diagnostics, port-by-port functionality testing, firmware verification, factory reset, and final inspection. A Certificate of Testing ships with every unit.
Cisco C3KX-NM-10G Refurbished 4-Port 10G SFP+ Network Module
$29.99
Cisco
Cisco C3KX-NM-10G Refurbished 4-Port 10G SFP+ Network Module
MPN: C3KX-NM-10G
$29.99
In Stock — Ships Same Day
