Cisco C3850-NM-4-1G 4-Port 1GB SFP Network Module - Expansion for 3850

Our review of the Cisco C3850-NM-4-1G finds it best suited for network engineers and small IT teams that need a reliable way to add fiber uplink capacity to a 3850 series switch. This refurbished expansion module delivers four gigabit SFP ports in a compact card that slides into the 3850 chassis, providing straightforward port growth without changing the existing switch. The biggest reason to buy is the simple, low-cost method of adding dedicated fiber or copper SFP connectivity to an operational 3850 platform while retaining chassis features and management.

Key Features

• Four 1GB SFP ports: adds four independent gigabit SFP slots so administrators can attach fiber uplinks or transceivers for varied media types.
• Designed for 3850 series: the module is built to integrate with the 3850 chassis for a native expansion option that keeps existing switch functionality.
• Refurbished and tested: professionally inspected and tested to work and look like new, offering lower cost access to additional ports while maintaining reliability.
• Hotswappable form factor: installs into the expansion bay without major reconfiguration, minimizing downtime during upgrades.
• Gigabit LAN support: supports standard gigabit speeds enabling uplink and aggregation use cases in small datacenter or campus edge deployments.

Who It's For

This module is ideal for organizations that already run Cisco 3850 switches and need to expand uplink or aggregation capacity without replacing the base switch. Network teams that require additional SFP slots for fiber runs to distribution switches, servers, or service provider links will find this a compact, compatible option.

It is less appropriate for those who do not own a 3850 chassis, need multi-gig or 10Gb connections, or prefer a new product warranty over a professional refurb guarantee; such buyers should consider different modules or new switches that meet those larger capacity needs.

Pros & Cons

Pros

• Provides four additional gigabit SFP ports in a native expansion module for the 3850, simplifying uplink additions.
• Refurbished and tested to function like new, giving cost savings over new modules while retaining core compatibility.
• Compact, hotswappable design reduces upgrade window and preserves the installed switch configuration.

Cons

• Refurbished status means it may not include manufacturer-new packaging or full new-product warranty options.

Specifications

Product	C3850-NM-4-1G network module
Ports	4 x 1GB SFP
Compatibility	Designed for Cisco 3850 series switches
Form factor	Expansion module, hotswappable
Condition	Pre-owned / refurbished and professionally inspected
Primary use	Gigabit LAN uplinks and aggregation

Our Verdict

The Cisco C3850-NM-4-1G is a pragmatic, cost-effective way to add four gigabit SFP ports to an existing 3850 switch. For teams that value compatibility and minimal disruption, the refurbished module delivers solid expansion capability and tested reliability, making it a good value for extending uplink or fiber connectivity without replacing the switch chassis.

Frequently Asked Questions

Will this module work in a non3850 chassis?
It is specifically designed for the 3850 series and should be used only in compatible Cisco 3850 switches.

Are refurbished modules reliable?
This unit is professionally inspected and tested to work and look like new; refurbished items offer lower cost but may have different warranty terms than new units.

What types of media can be used with the ports?
The four SFP slots accept standard 1GB SFP transceivers for fiber or copper SFP modules depending on the installed transceiver type.