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The x4120-1048 is a 10 Gigabit Ethernet copper to fiber media converter. It offers conversion technology by providing one 10GBase-T RJ-45 port and one pluggable 10GBase-X fiber SFP+ port. The open SFP+ port supports a wide variety of Transition Networks 10GE SFP+ fiber modules, as well as third party MSA compatible SFP+ modules.
The x4120 provides several 10G Ethernet enterprise and data center connectivity solutions. Since most 10G Ethernet switches support a combination of copper RJ-45 and open SFP+ ports, the x4120 allows users to convert either of these ports to the media type of their preference to match their network requirements, including direct attached copper SFP+ cables.
MAIN OVERVIEW FEATURES: Total Number of Ports: 1Network (RJ-45): YesDVI: NoUSB: NoManagement Port: NoNumber of Network (RJ-45) Ports: 1Media Type Supported: Twisted PairNumber of Total Expansion Slots: 1Expansion Slot Type: SFP+Number of SFP+ Slots: 1Ethernet Technology: 10 Gigabit EthernetNetwork Technology: 10GBase-T,10GBase-XForm Factor: Wall Mountable,Rail-mountable,Rack-mountableHeight: 1" (25.40 mm)Width: 3.25" (82.55 mm)Depth: 6.50" (165.10 mm)Environmentally Friendly: YesEnvironmental Certification: RoHS,WEEELimited Warranty: Lifetime
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Limited Warranty period (parts): 1 year
- Limited Warranty period (labor): 1 year
- Read full details
Return Policies
- Return for refund until: January 31, 2027
- Return for replacement until: January 31, 2027
- This item is covered by Newegg.com's Extended Holiday Return Policy.
- Read full return policy for details.
We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2026 and December 31, 2026 you will have until January 31, 2027 to return your product.
Manufacturer Contact Info
- Manufacturer Product Page
- Manufacturer Website
- Support Phone: 1-800-260-1312
- Support Website
- View other products from Transition Networks
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The TRANSITION S4120-1048 is a standalone 10GbE media converter that connects 10GBase-T copper Ethernet to 10GBase-X through an SFP+ slot, for network teams matching copper and fiber links in an existing network.
Recommended For
- Network administrators connecting a 10GBase-T copper device—such as a server or storage appliance—to a fiber-based 10GbE link, when a dedicated media converter is preferable to replacing network equipment.
- IT teams extending a 10GbE copper connection over fiber between network areas, with the fiber type and SFP+ module matched to the installed link.
- Fixed network installations that need a standalone, Layer 1 conversion point and value line-rate forwarding with low latency rather than routing or switching features.
- Network technicians who need to bridge 10GBase-T and 10GBase-X media and can select a compatible SFP+ module for the fiber standard and distance in use.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Connecting 10GBase-T copper networking to a 10GBase-X fiber link |
| Network Technology | Supports 10GBase-T and 10GBase-X networking |
| Physical Specifications | Listed weight: 2.75; dimensions: 27.94 × 24.13 × 3.5 cm |
| Package Contents | Includes TC4806; package quantity: 1; package dimensions: 27.94 × 24.13 × 8.89 cm |
| Model Identifiers | TRANSITION S4120-1048; manufacturer: Transition Networks, Inc |