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Compact silver metal box with one RJ-45 port and one SFP+ slot on the front face

Transition Networks

Transition Networks S4120-1048-NA 10GBase-T RJ-45 to SFP+ media converter

SKU CH-HV40-KX5CE MPN S4120-1048-NA

Converts a 10GBase-T RJ-45 link to an open SFP+ fiber port for 10 Gigabit Ethernet media flexibility

  • HighlightsNetwork Technology:10GBase-T Network Technology:10GBase-X
  • Product weight2.75
  • In the boxTC4806
  • Converts 10G copper to fibre with open SFP+ slot
  • Wall, rail or rack mounting fits any cabinet layout
  • Single RJ-45 and SFP+ port simplifies cabling
  • Light 2.75 lb unit eases installation handling
  • Environmentally friendly design meets green procurement goals

Copper-to-fiber 10 Gigabit media converter

The Transition Networks S4120-1048-NA converts between a 10GBase-T RJ-45 port and an open SFP+ slot for 10GBase-X fiber connectivity. It suits network engineers extending copper links over fiber in enterprise or data-center racks. The wall, rail and rack-mountable chassis measures 1 by 3.25 by 6.50 inches and weighs 2.75 units.

SFP+ slot limits distance and module choice

The single SFP+ expansion slot accepts Transition Networks 10GE SFP+ modules and third-party MSA-compatible transceivers, but reach and wavelength depend entirely on the chosen module. Copper-side 10GBase-T is bound by twisted-pair distance limits, while fiber performance varies with the inserted optic; direct-attach copper cables are also supported.

Rugged metal enclosure with flexible mounting

The compact metal housing provides passive cooling and three mounting options for dense cabinets or wall brackets. One RJ-45 jack and one SFP+ cage sit side by side for straightforward patching, and the package includes the TC4806 accessory kit for installation. No management port or USB console is present, so configuration relies on the connected switch.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $1,170.99
Pricier than about 90% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameTRANSITION
Model nameS4120-1048
Size & build
Shipping weight1.18 kg
Package size279 × 241 × 89 mm
In the box
In the boxTC4806

Questions about this item

Which SFP+ module should I choose for the open port?

The open SFP+ port accepts Transition Networks 10GE SFP+ fiber modules and third-party MSA-compatible SFP+ modules, so select a module that matches your required fiber type and distance.

What does the 10GBase-T RJ-45 port deliver when connected to a switch?

It provides a 10 Gigabit Ethernet copper link over twisted-pair cabling, enabling direct connection to 10GBase-T switch ports or servers with RJ-45 interfaces.

What does the SFP+ interface cap in practice?

The SFP+ slot supports 10GBase-X optics and direct-attach copper cables at 10 Gigabit Ethernet speeds, limited by the installed module's rated distance and media.

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