REFURBISHED
Cisco
Cisco C3850-NM-2-40G Refurbished — 2-Port 40GE QSFP+ Network Module
MPN: C3850-NM-2-40G
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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 C3850-NM-2-40G is a plug-in uplink network module designed exclusively for the Cisco Catalyst 3850 Series switch platform. It delivers two QSFP+ ports operating at 40 Gigabit Ethernet, providing the highest-bandwidth uplink option available in the Catalyst 3850 module lineup. Every unit has been reset to factory defaults and verified through WhaleyComm's ISO 9001-certified testing process before shipment.The C3850-NM-2-40G is a hot-swappable, plug-in module that slots directly into the network module bay of compatible Catalyst 3850 switches. Each QSFP+ port supports native 40 Gbps connectivity or can be converted to four 10 Gbps SFP+ links per port using an approved QSFP+ to SFP+ breakout cable — giving network engineers up to eight 10GbE uplinks from a single module. The module delivers 80 Gbps of non-blocking switching capacity and is compatible with switches running Cisco IOS XE 3.6.0E or later. Supported QSFP+ optics include QSFP-40G-SR4, QSFP-40G-CSR4, QSFP-40G-SR-BD, and QSFP-40G-LR4. Module compatibility is limited to the 24-port and 48-port multigigabit Catalyst 3850 models and the 24-port 10G SFP+ switch model.
At $390, this refurbished C3850-NM-2-40G represents a significant discount versus new list pricing — making it the smart choice for enterprises looking to maximize uplink throughput in an existing Catalyst 3850 stack without a full infrastructure refresh. WhaleyComm has served 5,000+ enterprise customers over 25+ years. Every unit ships with our Lifetime Warranty.
Technical Specifications
Part Number
C3850-NM-2-40G
Device Type
Expansion / Uplink Network Module
Form Factor
Plug-in module (hot-swappable)
Number of Ports
2 x QSFP+
Port Speed
40 Gigabit Ethernet (native); 4x10 Gigabit Ethernet per port via breakout cable
Data Transfer Rate
40 Gbps per port
Switching Capacity
80 Gbps (non-blocking)
Connectivity Technology
Wired
Data Link Protocol
40 Gigabit LAN (IEEE 802.3ba)
Status Indicators
Port status LEDs
Hot Swappable
Yes
Supported VLANs
4094
Minimum IOS XE Version
Cisco IOS XE 3.6.0E or later
MTBF
9,303,100 hours
Weight
9.88 oz
Compatible Host Switches
Catalyst 3850-24XS-E, 3850-24XS-S, 3850-24XU-E, 3850-24XU-S, and compatible multigigabit 24/48-port models
Supported QSFP+ Optics
QSFP-40G-SR4, QSFP-40G-CSR4, QSFP-40G-SR-BD, QSFP-40G-LR4
Operating Temperature
-5°C to +45°C (up to 5,000 ft / 1,500 m)
Condition
Refurbished — professionally tested, reset to factory defaults
Ideal Use Cases
Campus Core Uplink Expansion
Add 40GbE uplinks to existing Catalyst 3850 access switches to meet growing bandwidth demands from high-density wireless, UC, and video traffic — without replacing the switch chassis.
Data Center Edge Aggregation
Connect Catalyst 3850 stacks to core or distribution-layer switches at 40 Gbps, reducing bottlenecks between access and aggregation layers in enterprise data center environments.
10GbE Breakout Deployments
Use each QSFP+ port with a 4x10G breakout cable to convert a single 40GbE port into four independent 10GbE SFP+ links, maximizing port density for server or storage connectivity.
StackWise Stack Interconnect Upgrade
Provide high-bandwidth inter-stack uplinks between Catalyst 3850 stacks for organizations requiring maximum throughput between aggregation points.
Budget-Conscious Infrastructure Refresh
Refresh uplink capacity in a Catalyst 3850 deployment at a fraction of new list pricing, extending the useful life of installed switches while doubling or quadrupling uplink speed.
Mixed-Speed Uplink Flexibility
Support environments that currently run 10G but plan to migrate to 40G — the breakout cable capability lets you use 10G today and cut over to native 40G without swapping the module.
What's Included
Cisco C3850-NM-2-40G Catalyst 3850 2 x 40GE Network 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 WS-C3850-24XS-E
✓
Cisco Catalyst WS-C3850-24XS-S
✓
Cisco Catalyst WS-C3850-24XU-E
✓
Cisco Catalyst WS-C3850-24XU-S
✓
Cisco Catalyst 3850 24-port and 48-port Multigigabit models
Minimum Software Version
✓
Cisco IOS XE 3.6.0E or later
Supported QSFP+ Optics
QSFP-40G-SR4
QSFP-40G-CSR4
QSFP-40G-SR-BD
QSFP-40G-LR4
Breakout Cable Support
✓
QSFP+ to 4x SFP+ breakout cable (each 40G port → four 10G SFP+ ports)
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-2-40G is supported on 24-port and 48-port multigigabit Catalyst 3850 switches and the 24-port 10G SFP+ switch model (including WS-C3850-24XS-E, 3850-24XS-S, 3850-24XU-E, and C3850-24XU-S). It is not compatible with 12-port or 24-port standard SFP+ models. The host switch must be running Cisco IOS XE 3.6.0E or later.
Yes. Each QSFP+ port supports breakout mode using a Cisco-approved QSFP+ to SFP+ breakout cable, which converts each 40G port into four independent 10 Gbps SFP+ interfaces — providing up to eight 10GbE uplinks per module. When a 40G QSFP optic is used, the ports default to native 40G mode.
Yes, the C3850-NM-2-40G is fully hot-swappable and can be installed or removed without powering down the host Catalyst 3850 switch, minimizing disruption during deployment or maintenance.
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-2-40G Refurbished — 2-Port 40GE QSFP+ Network Module
$390.00
Cisco
Cisco C3850-NM-2-40G Refurbished — 2-Port 40GE QSFP+ Network Module
MPN: C3850-NM-2-40G
$390.00
In Stock — Ships Same Day
