A Pair of 1.25G/s Bidi Gigabit Multi-Mode Fiber Ethernet Media Converter with 2PCS Bidi SFP LC Dual Transceiver Module Included
Quick take
This is a pair of gigabit fiber media converters that connect a RJ45 copper Ethernet port to a multi-mode fiber link using included bidi SFP transceivers (rated up to 550 m). It is a straightforward solution for extending a network to another building, adding an optical isolation segment, or replacing damaged copper runs, with a key caveat that some buyers report occasional DOA units, so you should test early.
Pros and cons
Pros
- Plug-and-play setup, with status LEDs to monitor link, activity, duplex, and power
- Gigabit throughput, auto-negotiation on the RJ45 side, and support for jumbo frames up to 9K bytes
- Includes the needed bidi SFP LC multi-mode transceivers (so you do not have to source them separately)
- Designed for multi-mode fiber runs up to 550 m with the included transceivers
Cons
- Review evidence suggests build durability may be “typical for the price,” so treat it as a cost-focused appliance, not rugged industrial gear
- There are reports of DOA units, so it is wise to verify functionality immediately after arrival
What buyers think
Buyer-review evidence is limited but consistently points to the same practical themes: the converters generally work as expected once set up, and many users describe them as easy to install with network performance that matches expectations for gigabit bridging. Several reports mention continued operation over long stretches in real-world environments, including use cases where optical isolation is valuable. The main recurring risk signal is the occasional report of DOA units, plus a cautious note that the hardware does not feel “super durable” compared with higher-end, more rugged networking equipment.
What this media converter pair is for
This model is built to bridge between copper Ethernet (RJ45) and a fiber Ethernet link (SFP). In practice, that makes it useful when you need to:
- Extend a gigabit Ethernet connection farther than standard copper can handle
- Bridge two network segments with optical separation (often helpful where EMI or grounding differences are concerns)
- Connect devices in separate areas or buildings using multi-mode fiber
Key features that matter during buying
Speed, interfaces, and fiber distance
It is rated as a 1.25 Gb/s SFP-class gigabit media converter solution, using an SFP optical port with included bidi LC dual transceivers for multi-mode fiber. The specified reach is up to 550 m for the multi-mode setup, which is the primary “yes” or “no” check for most buyers.
RJ45 behavior and network compatibility
On the copper side, the RJ45 port supports 10/100/1000 auto-negotiation and supports MDI/MDIX auto-crossover. That reduces setup friction when connecting to switches, routers, or other gigabit copper ports that might otherwise require manual matching.
Monitoring and troubleshooting
Status LEDs are provided for fiber and copper activity and link, duplex status on the copper side (FDX), and power. That is especially helpful when you are trying to confirm the fiber link is actually up and passing traffic.
Jumbo frames support
It supports jumbo frames up to 9K bytes. If your environment uses jumbo MTU (for example, certain file transfer or storage networks), this can reduce fragmentation and help keep performance consistent.
Operating environment expectations
Operational temperature is listed from 0°C to 60°C, which generally covers typical indoor or climate-controlled placements. It is also designed with a metal enclosure and venting intended to support heat dissipation.
Pros and cons, translated to real decisions
Who should buy it
- You need a simple RJ45-to-fiber bridge for gigabit networking and have multi-mode fiber available
- You want a set that includes the bidi SFP transceivers, so you can deploy without sourcing optics separately
- You are installing in a place where quick visual confirmation (LEDs) and plug-and-play behavior matter
- You may benefit from jumbo frame support for an MTU-tuned network design
Who should avoid it
- Your fiber run is longer than the stated multi-mode distance, or you cannot confirm your fiber type is compatible
- You need rugged, heavy-duty industrial-grade construction and cannot tolerate “consumer equipment” build expectations
- You cannot test and validate on arrival, given the existence of DOA reports
Installation checklist before you click “buy”
- Confirm fiber type and connector: This setup is intended for multi-mode fiber with dual LC connections and the included bidi SFP transceivers.
- Measure your run length: The stated reach is up to 550 m in the multi-mode configuration, so be conservative if your fiber is not brand new or has unknown loss.
- Match speed expectations: If you need 2.5G/5G/10G, this is a gigabit-class solution, so it may not be the right tier.
- Plan placement: Check the environment stays within the listed operating range and allow ventilation.
- Test immediately after arrival: Given DOA reports, verify LEDs, link, and basic connectivity right away.
Verdict
This is a practical, budget-minded way to add a gigabit copper-to-fiber bridge, especially when you need multi-mode connectivity up to the stated 550 m range and want a plug-and-play kit that includes the necessary bidi transceivers. If you can validate fiber compatibility and you are willing to test the unit early, it can be a solid choice for extending networks or creating optical isolation segments.
Price and availability
Pricing can vary, but this pair is typically positioned as an affordable gigabit media-converter option. Check the latest price and shipping details on the product’s page before ordering.
FAQs
What does this converter pair do?
It converts Ethernet from RJ45 copper to fiber using an SFP optical link. The included bidi SFP LC transceivers let you deploy a multi-mode fiber connection rated for up to 550 m (with the specified setup).
Is it gigabit only?
Yes, it is designed for 10/100/1000 Ethernet on the RJ45 side and a gigabit-class fiber link on the SFP side (1.25 Gb/s).
Does it support jumbo frames?
It supports jumbo frames up to 9K bytes, which can matter if your network and devices are configured for higher MTU.
Do I need to buy transceivers separately?
No, the kit includes the bidi SFP LC multi-mode dual transceiver modules.
What fiber type and distance should I expect?
It is intended for multi-mode fiber with LC connectors, with a stated reach up to 550 m in the multi-mode configuration.
Any practical downsides to consider?
Some buyers report DOA units, so it is smart to power up and test right after delivery. Also, durability reviews suggest it may not feel as rugged as higher-end equipment.
Specifications
| Product Title | A Pair of 1.25G/s Bidi Gigabit Multi-Mode Fiber Ethernet Media Converter with 2PCS Bidi SFP LC Dual Transceiver Module Included, 10/100/1000Base-Tx to 1000Base-SX SMF RJ45 to SFP Slot up to 550M |
|---|---|
| Category | Electronics > Computers & Accessories > Networking Products > Network Transceivers |
| Manufacturer | GESD |
| Item Weight | 1.06 pounds |
| Product Dimensions | 4.72 x 4.72 x 1.18 inches |
| Item model number | SFP Gigabit Dual LC MM-550M |
| Is Discontinued By Manufacturer | No |
Available variants
Capacity
- Include MultiMode LC Dual Port
- Include SingleMode LC Single Core Port
- Open SFP Slot
- Include SingleMode LC Dual Core Port
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