4 Pack 1.25G 850nm Multimode SFP LC Transceiver Fiber Module
Quick take
This 4-pack of 1.25Gb/s (1000BASE-SX) SFP modules is built for 850nm OM3 multimode fiber links up to 550 meters, with dual LC connectors and DDM so you can monitor real-time transceiver parameters. It is a practical choice for anyone standardizing spares or replacing failed optics in compatible 1G SFP ports, but you need to match your gear and fiber type (multimode vs. single-mode) to avoid link issues.
Pros and cons
Pros
- Multimode 850nm (OM3) optics rated for up to 550m on 1G (1000BASE-SX) links.
- Hot-swappable design for easier upgrades and replacements.
- DDM support to monitor real-time fiber link/transceiver parameters.
- 4-pack value if you are stocking spares for multiple ports or sites.
Cons
- Compatibility depends on your switch supporting MSA-compliant SFP behavior and the correct module type.
- Designed for multimode fiber, so it will not suit single-mode (or mismatched wavelength) runs.
What buyers think
Buyer-review evidence is strongly centered on “it works” outcomes. Multiple snippets mention that these transceivers were plug-and-play, functional in Cisco Catalyst switches, and able to operate as expected once installed. Reviews also highlight perceived form, fit, and function consistency and value for money when compared to the need to purchase replacements. Note that the review evidence shared here is limited mostly to compatibility and basic functionality, so performance under different fiber plants and long-term environmental behavior is harder to judge from the available feedback.
What this transceiver is (and what it is not)
This is a 1.25Gb/s SFP (small form-factor pluggable) module for gigabit Ethernet over fiber, using 850nm multimode optics with dual LC connectors. The specified fiber match is OM3 multimode, with a rated reach of up to 550 meters for the intended 1000BASE-SX use case.
It is not intended for single-mode fiber designs, and it is not a fit if your network expects different wavelengths or different SFP performance classes. In other words, the main buying risk is selecting the wrong fiber type, wavelength, or transceiver class for your existing switch and cabling.
Key specs that matter for compatibility
- Data rate: 1.25Gb/s (for 1G links, 1000BASE-SX class).
- Wavelength: 850nm.
- Fiber type: OM3 multimode.
- Connector: Dual core LC.
- Reach: up to 550 meters (multimode OM3 budget).
- Standards: SFP MSA compliant and IEEE 802.3z compliant.
- Monitoring: Advanced DDM support for real-time monitoring of transceiver/link parameters.
Installation and day-to-day usability
The module is built for hot-swapping, which is useful when you need to replace an optics module without taking the whole system down. The described latch mechanism (rotate ring latch down 90 degrees to unlock, then pull the transceiver) is intended to make removal and reseating straightforward.
Power draw is stated as less than 1 watt, which can matter if you are replacing multiple optics in densely populated switches. The housing is described as metal, with an emphasis on durability for repeated insertions.
Pros and cons for real buying decisions
Pros if you match the use case
- If your network already uses 850nm OM3 multimode LC SFP optics, this offers the features you normally look for: correct connector type, hot-swap behavior, and DDM monitoring.
- The 4-pack format is convenient when you want multiple spares for different ports or to standardize optics across a small set of switches.
Cons and limitations to check before ordering
- Switch and optic compatibility: even when products claim MSA compliance, some environments are picky. Confirm your device’s supported SFP type if you have any doubt.
- Fiber mismatch risk: selecting multimode 850nm optics for a single-mode plant (or a different wavelength) will prevent proper link establishment.
Who should buy it
- Network admins and IT buyers replacing or stocking 1G multimode SFP optics where the equipment expects 850nm OM3 LC.
- Teams who need DDM visibility for operational monitoring (you can read transceiver/link parameters instead of relying only on link status LEDs).
- Buyers who want a 4-pack strategy for multiple ports or sites.
Who should avoid it
- Anyone with single-mode fiber runs or a network design that requires a different wavelength or SFP class.
- Buyers whose switch model does not support the expected MSA-compliant SFP behavior for 1000BASE-SX optics.
Price and availability
At the time of writing, the listed price is $44.11 USD for the 4-pack, and the module is marked as in stock. If you only need one module, compare single-unit pricing from other sellers to be sure a multipack fits your replacement timeline.
Alternatives to consider
If your main goal is similar 1G fiber connectivity, your alternatives usually fall into two categories:
- Different reach or fiber type: choose optics that match your cabling (OM3 vs. OM4, or single-mode designs) and your distance requirement so you do not run over the link budget.
- Different speed class: if your switch ports are not 1G SFP targets, you will need the correct speed/spec class rather than just the right wavelength.
If you are unsure, match the wavelength and fiber type first, then confirm your switch supports the correct SFP MSA behavior for that module category.
Verdict
This 4-pack of 850nm OM3 multimode SFP LC transceivers is a solid fit when your environment already uses 1000BASE-SX over multimode fiber and you want DDM monitoring with hot-swappable convenience. The main caveat is typical for SFP optics, you must get the fiber type, wavelength, and switch compatibility right for reliable link operation.
FAQ
Is this SFP module compatible with Cisco switches?
It is described as SFP MSA compliant and IEEE 802.3z compliant, and it is intended for use in compatible Cisco equipment with 1Gb SFP ports that support this optics type. If you are matching a specific Cisco part, confirm the expected 850nm OM3 multimode SFP behavior for your model.
What fiber type is this transceiver designed for?
It is designed for multimode OM3 fiber with 850nm optics and dual LC connectors.
How far will it transmit?
The rated reach is up to 550 meters for 1G (1000BASE-SX) on OM3 multimode fiber.
Does it support DDM monitoring?
Yes, it includes advanced DDM functionality to monitor real-time parameters and the state of fiber links.
Is it hot-swappable?
Yes. It is described as hot-swappable, supporting insertion and replacement without a full system shutdown (follow your switch’s handling guidance when reseating optics).
What should I check if I get link issues?
Re-check that your equipment supports this SFP type, that you are using multimode OM3 fiber, that the wavelength matches your design (850nm), and that your LC connection and port configuration align with 1000BASE-SX expectations.
Specifications
| Product Title | 4 Pack 1.25G 850nm Multimode SFP LC Transceiver Fiber Module 550 Meters 1000Base-SX LC MMF for Cisco GLC-SX-MMD/SX-MM/SFP-GE-S,Fortinet,Ubiquiti UniFi UF-MM-1G,Mikrotik S-85DLC05D Meraki MA-SFP-1GB-SX |
|---|---|
| Category | Electronics > Computers & Accessories > Networking Products > Network Transceivers |
| Manufacturer | GESD |
| Item Weight | 4.2 ounces |
| Package Dimensions | 6.61 x 4.69 x 1.34 inches |
Available variants
Size
- 1.25G MultiMode SFP to LC 4Pcs
- 1.25G MultiMode SFP to LC 2Pcs
- 1.25G MultiMode SFP to LC 10Pcs
- 1.25G MultiMode SFP to LC 1Pcs
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