Cisco C3850-NM-2-40G Catalyst 3850 Network Module — 2x 40G QSFP+, for 24XS, 24XU and 12X48U, Refurbished
Warranty: Lifetime
Two 40G uplinks for a Catalyst 3850 — but only three 3850 models take it
Cisco C3850-NM-2-40G — Catalyst 3850 network module, 2x 40G QSFP+
→ Supported on three models only. Cisco lists the C3850-NM-2-40G for the WS-C3850-24XS, WS-C3850-24XU and WS-C3850-12X48U. It is not supported on the 48T, 48P, 48U or 12XS. Check your switch before ordering.
Part Number: C3850-NM-2-40G
SKU: C3850-NM-2-40G-R
Description: Catalyst 3850 network module with two 40G QSFP+ slots
This hot-swappable module adds two 40G QSFP+ uplink ports to a supported Catalyst 3850. It is the fastest uplink option in the 3850 family.
On a standard 24- or 48-port gigabit 3850, the supported 10G modules are the C3850-NM-2-10G and C3850-NM-4-10G.
Which One Do I Need?
| Your switch | Supported 40G module? |
|---|---|
| WS-C3850-24XS, WS-C3850-24XU, WS-C3850-12X48U | Yes — C3850-NM-2-40G, this listing |
| WS-C3850-48T / 48P / 48U / 48F | No — use C3850-NM-4-10G or C3850-NM-2-10G |
| WS-C3850-12XS | No — Cisco lists C3850-NM-4-10G only |
| WS-C3850-48XS | No module slot (fixed uplinks) |
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | C3850-NM-2-40G |
| Ports | 2x 40G QSFP+ |
| Hot-swap | Yes |
| Supported switches | WS-C3850-12X48U, WS-C3850-24XU, WS-C3850-24XS |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco Catalyst 3850 Series data sheet and the Catalyst 3850 hardware installation guide (network modules).
Good to Know
- Optics separate. The QSFP+ slots ship empty; order 40G optics or DACs.
- Wrong switch, no link. Installing this module in an unsupported 3850 is the most common mistake with this part.
Quick Checklist — Is This the Right Module?
Your switch is a WS-C3850-24XS, WS-C3850-24XU or WS-C3850-12X48U. You need two 40G QSFP+ uplinks.
Availability
Refurbished and tested · Ships from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
We confirm stock and lead time with you before an order ships. Need several, or a matching set? Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When something fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- Cisco QSFP-40G-SR4 — 40G multimode optic
- Cisco WS-C3850-24XS-E — a switch that takes this module
- C3850-NM-4-1G — 1G module for gigabit 3850s
Related Guides
Two 40G uplinks for a Catalyst 3850 — but only three 3850 models take it
Cisco C3850-NM-2-40G — Catalyst 3850 network module, 2x 40G QSFP+
→ Supported on three models only. Cisco lists the C3850-NM-2-40G for the WS-C3850-24XS, WS-C3850-24XU and WS-C3850-12X48U. It is not supported on the 48T, 48P, 48U or 12XS. Check your switch before ordering.
Part Number: C3850-NM-2-40G
SKU: C3850-NM-2-40G-R
Description: Catalyst 3850 network module with two 40G QSFP+ slots
This hot-swappable module adds two 40G QSFP+ uplink ports to a supported Catalyst 3850. It is the fastest uplink option in the 3850 family.
On a standard 24- or 48-port gigabit 3850, the supported 10G modules are the C3850-NM-2-10G and C3850-NM-4-10G.
Which One Do I Need?
| Your switch | Supported 40G module? |
|---|---|
| WS-C3850-24XS, WS-C3850-24XU, WS-C3850-12X48U | Yes — C3850-NM-2-40G, this listing |
| WS-C3850-48T / 48P / 48U / 48F | No — use C3850-NM-4-10G or C3850-NM-2-10G |
| WS-C3850-12XS | No — Cisco lists C3850-NM-4-10G only |
| WS-C3850-48XS | No module slot (fixed uplinks) |
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | C3850-NM-2-40G |
| Ports | 2x 40G QSFP+ |
| Hot-swap | Yes |
| Supported switches | WS-C3850-12X48U, WS-C3850-24XU, WS-C3850-24XS |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco Catalyst 3850 Series data sheet and the Catalyst 3850 hardware installation guide (network modules).
Good to Know
- Optics separate. The QSFP+ slots ship empty; order 40G optics or DACs.
- Wrong switch, no link. Installing this module in an unsupported 3850 is the most common mistake with this part.
Quick Checklist — Is This the Right Module?
Your switch is a WS-C3850-24XS, WS-C3850-24XU or WS-C3850-12X48U. You need two 40G QSFP+ uplinks.
Availability
Refurbished and tested · Ships from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
We confirm stock and lead time with you before an order ships. Need several, or a matching set? Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When something fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- Cisco QSFP-40G-SR4 — 40G multimode optic
- Cisco WS-C3850-24XS-E — a switch that takes this module
- C3850-NM-4-1G — 1G module for gigabit 3850s