The journal
Stories and ideas
Field notes
A closer look at what moves us
Thoughtful perspective, useful details, and the stories behind the things we choose.
REFURBISHED
Cisco
Cisco C3850-NM-4-10G Refurbished - 4x10GE SFP+ Network Module
MPN: C3850-NM-4-10G
Request Bulk Quote
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.
Wire-speed 10G uplinks for the Catalyst 3850. Professionally tested. Backed by 25 years of enterprise trust.
This refurbished Cisco C3850-NM-4-10G is a hot-swappable, field-replaceable network uplink module for the Cisco Catalyst 3850 Series. Featuring four SFP+ ports, each capable of 10 Gigabit Ethernet operation and backward-compatible with 1 Gigabit SFP transceivers, the module delivers up to 40 Gbps of aggregate uplink bandwidth. Every unit at WhaleyComm is professionally tested and reset to factory defaults before shipment.The C3850-NM-4-10G slides directly into the Catalyst 3850 expansion slot, enabling high-speed aggregation to distribution and core layers without replacing existing switch infrastructure. The SFP+ receptacles support both 10GbE and 1GbE optics, allowing staged migration from Gigabit to 10 Gigabit as bandwidth demands grow. The module operates within the existing thermal envelope of the switch chassis with no additional fan hardware required.
This refurbished C3850-NM-4-10G delivers the same Cisco-quality performance as a new unit at a significant fraction of the list price. WhaleyComm is ISO 9001, R2v3, e-Stewards, and UNEDA certified — every unit ships with a Lifetime Warranty and a Certificate of Testing, giving your organization full confidence in the hardware before it ever touches the rack.
Technical Specifications
Part Number
C3850-NM-4-10G
Product Type
Network Module (Plug-in, Hot-Swappable)
Compatible Platform
Cisco Catalyst 3850 Series
Number of Ports
4
Port Type
SFP+
Port Speed
10 Gigabit Ethernet / 1 Gigabit Ethernet
Aggregate Uplink Bandwidth
40 Gbps
Installation
Hot-swappable, field-replaceable
EU RoHS Compliance
Yes (2011/65/EU)
ECCN
5A002.a
Ideal Use Cases
Campus Distribution Uplinks
Connects Catalyst 3850 access switches to distribution-layer aggregation nodes at 10GbE speeds, reducing bottlenecks for users generating high-bandwidth traffic such as video conferencing and large file transfers.
Data Center Access-to-Core Connectivity
Provides four dedicated 10GbE uplinks between access and core switching layers in virtualized environments, supporting live VM migration and high-throughput workloads without infrastructure replacement.
Gigabit-to-10G Migration Path
Organizations with existing Gigabit SFP investments can populate slots incrementally — running 1G optics today and swapping to 10G SFP+ transceivers as bandwidth demands increase, protecting capital investment.
Stacked Switch Backbone Uplinks
In a StackWise-480 stack of Catalyst 3850 switches, the C3850-NM-4-10G provides the high-speed uplink capacity to aggregate stacked-switch traffic onto a 10G backbone without saturating shared stack bandwidth.
Enterprise WAN Edge Aggregation
Ideal for deployments where the Catalyst 3850 terminates uplinks to a WAN or MPLS edge router, delivering wire-speed 10GbE handoffs that match modern service provider circuit speeds.
What's Included
1x Cisco C3850-NM-4-10G 4x10GE Network Module (refurbished)
Certificate of Testing
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 Cisco Catalyst 3850 Series Models (48-port Gigabit Ethernet and 12-port or higher 10 Gigabit Ethernet)
WS-C3850-48T
WS-C3850-48P
WS-C3850-48F
WS-C3850-48U
WS-C3850-12X48U
WS-C3850-12XS
WS-C3850-24XU
✓
Not compatible with: Catalyst 3650 Series, Catalyst 9300 Series (requires C9300-NM modules), or Catalyst 3850 48-port 10G SFP+ models where optional uplink modules are not supported.
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 C3850-NM-4-10G is supported on 48-port Gigabit Ethernet Catalyst 3850 models and on 12-port or higher 10 Gigabit Ethernet models. It is not supported on 24-port or 48-port 10G SFP+ models where optional uplink modules are restricted. Verify your specific chassis model against Cisco's compatibility matrix before ordering.
No. The C3850-NM-4-10G is hot-swappable, meaning it can be installed without powering off the switch. It is best practice to save your running configuration and confirm the switch recognizes the module after insertion.
Yes. Each SFP+ port on the C3850-NM-4-10G supports both 10 Gigabit Ethernet and Gigabit Ethernet optics, allowing you to reuse existing 1G SFP transceivers and upgrade to 10G SFP+ at any point without additional hardware changes.
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 C3850-NM-4-10G Refurbished - 4x10GE SFP+ Network Module
$185.00
Cisco
Cisco C3850-NM-4-10G Refurbished - 4x10GE SFP+ Network Module
MPN: C3850-NM-4-10G
$185.00
In Stock — Ships Same Day
