Cisco GLC-SX-MM 1000BASE-SX SFP Transceiver — 850nm Multimode, LC Duplex, Refurbished
Warranty: Lifetime
The original Cisco 1G short-reach SFP — for keeping an existing fleet on the exact part number
Cisco GLC-SX-MM — 1000BASE-SX SFP, 850nm, multimode fiber, LC duplex
→ GLC-SX-MM has no DOM. Cisco replaced it with the GLC-SX-MMD, which adds Digital Optical Monitoring. If you want light levels in the CLI, order the GLC-SX-MMD instead.
Part Number: GLC-SX-MM
SKU: GLC-SX-MM-R
Description: 1000BASE-SX SFP transceiver module, multimode, 850nm, LC duplex
GLC-SX-MM is Cisco's end-of-life 1000BASE-SX SFP. It is still the part some change-control processes and spares lists call for by name, which is why we carry it.
Cisco's replacement, GLC-SX-MMD, has the same 1000BASE-SX optics on multimode fiber and adds DOM and an extended temperature range.
Which One Do I Need?
| If you need | Part |
|---|---|
| Exact-match spare for a GLC-SX-MM fleet | GLC-SX-MM — this listing |
| Same optics, with DOM (Cisco's replacement) | GLC-SX-MMD, New or refurbished |
| 1G over single-mode fiber | GLC-LH-SMD |
| 10G over multimode fiber | SFP-10G-SR |
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | GLC-SX-MM |
| Standard | 1000BASE-SX |
| Data rate | 1 Gb/s |
| Form factor | SFP |
| Wavelength | 850nm |
| Fiber | Multimode |
| Connector | LC duplex |
| Reach | Up to 550 m on 50/125 µm multimode (OM2) per Cisco |
| DOM | Not supported (GLC-SX-MMD adds DOM) |
| Lifecycle | End of life; replacement is GLC-SX-MMD |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco End-of-Sale notice for GLC-SX-MM (Cisco EoL bulletin) and Cisco 1000BASE SFP data sheet.
Good to Know
- Multimode only. 1000BASE-SX will not work over single-mode fiber. Check the jacket color and marking on your patch cords.
- Both ends must match. An SX optic links to another SX optic, not to an LX or LH optic.
- Reach depends on fiber grade. Older 62.5 µm fiber gives much shorter reach than 50 µm OM2 or better.
Quick Checklist — Is This the Right Module?
Your port takes a 1G SFP. Your fiber is multimode with LC connectors. The other end is also 1000BASE-SX. You need the exact GLC-SX-MM part, or you do not need DOM.
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 GLC-SX-MMD — the current part with DOM
- OM4 LC to LC multimode patch cable, 2 m
- Cisco GLC-LH-SMD — 1G single-mode
Related Guides
The original Cisco 1G short-reach SFP — for keeping an existing fleet on the exact part number
Cisco GLC-SX-MM — 1000BASE-SX SFP, 850nm, multimode fiber, LC duplex
→ GLC-SX-MM has no DOM. Cisco replaced it with the GLC-SX-MMD, which adds Digital Optical Monitoring. If you want light levels in the CLI, order the GLC-SX-MMD instead.
Part Number: GLC-SX-MM
SKU: GLC-SX-MM-R
Description: 1000BASE-SX SFP transceiver module, multimode, 850nm, LC duplex
GLC-SX-MM is Cisco's end-of-life 1000BASE-SX SFP. It is still the part some change-control processes and spares lists call for by name, which is why we carry it.
Cisco's replacement, GLC-SX-MMD, has the same 1000BASE-SX optics on multimode fiber and adds DOM and an extended temperature range.
Which One Do I Need?
| If you need | Part |
|---|---|
| Exact-match spare for a GLC-SX-MM fleet | GLC-SX-MM — this listing |
| Same optics, with DOM (Cisco's replacement) | GLC-SX-MMD, New or refurbished |
| 1G over single-mode fiber | GLC-LH-SMD |
| 10G over multimode fiber | SFP-10G-SR |
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | GLC-SX-MM |
| Standard | 1000BASE-SX |
| Data rate | 1 Gb/s |
| Form factor | SFP |
| Wavelength | 850nm |
| Fiber | Multimode |
| Connector | LC duplex |
| Reach | Up to 550 m on 50/125 µm multimode (OM2) per Cisco |
| DOM | Not supported (GLC-SX-MMD adds DOM) |
| Lifecycle | End of life; replacement is GLC-SX-MMD |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: Cisco End-of-Sale notice for GLC-SX-MM (Cisco EoL bulletin) and Cisco 1000BASE SFP data sheet.
Good to Know
- Multimode only. 1000BASE-SX will not work over single-mode fiber. Check the jacket color and marking on your patch cords.
- Both ends must match. An SX optic links to another SX optic, not to an LX or LH optic.
- Reach depends on fiber grade. Older 62.5 µm fiber gives much shorter reach than 50 µm OM2 or better.
Quick Checklist — Is This the Right Module?
Your port takes a 1G SFP. Your fiber is multimode with LC connectors. The other end is also 1000BASE-SX. You need the exact GLC-SX-MM part, or you do not need DOM.
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 GLC-SX-MMD — the current part with DOM
- OM4 LC to LC multimode patch cable, 2 m
- Cisco GLC-LH-SMD — 1G single-mode