Stand-alone 10 Gigabit Ethernet Media Converter
10GBase-T Copper to Fiber


Product Details

SKU S4120-1048

10GBase-T RJ-45 100m to 10GBase-X SFP+ Slot (Empty)

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The S4120 is a stand-alone media converter that provides an interface between 10GBase-T ports and 10GBase-X slot via an open SFP+ port, allowing users to convert their 10Gig Ethernet ports to the preferred type of cabling used in their networks. The open SFP+ slot supports a wide variety of Transition Networks 10GE SFP+ fiber modules. Operating at Layer 1, the physical layer, data is passed through the converter at line speed, making the S4120 ideal for applications where low latency is essential. The ION S4120 can be managed, in-band, over the fiber, when it is linked back to a C4120 card installed in a managed ION chassis.


  • Transparent Link Pass Through
  • Auto-Negotiation
  • Auto-MDI/MDIX
  • Automatic Link Restoration
  • Loopback on Fiber and Copper
  • DMI
  • Support Remote In-band Management and Remote Firmware Upgrade when linked to a C4120 card installed in a managed ION chassis
  • Fiber Port supported standards
    • 10GBase-SR
    • 10GBase-LRM
    • 10GBase-LR
    • 10GBase-ER
    • 10GBase-ZR
  • The open SFP+ port also supports:
    • Direct attached 10G copper cable assemblies:
    • Both Class-I and Class-II fiber
    • SFP+ modules
    • SFP modules supporting WDM technology
  • Support 100m on Cat6a or higher UTP Per Energy Efficient Ethernet standards, IEEE 802.3az, UTP cable length is detected and power is adjusted according, to reduce power consumption on shorter UTP cable installs


Standards IEEE 802.3
IEEE 802.3an
IEEE 802.3ae
IEEE 802.3az
Data Rate 10 Gbps
Dip Switch SW1: Copper Loopback
SW2: Fiber Loopback
SW3: not used
SW4: Transparent Link Pass Through
Status LEDs PWR (Power): On = power is on
L/A SFP+ (Fiber port link and activity statue):
On = Link OK
Flashing = Link and Activity OK
Copper Link (Copper Link Status):
On = Link OK
Copper Act (Copper Link Activity):
On = Activity OK
Dimensions Width: 3.25” [82.55 mm]
Depth: 6.5” [165 mm]
Height: 1" [25.4 mm]
Power Consumption 10.5 Watts
Power Supply External AC/DC power supply, Universal AC input,
12VDC 1.6A output
Environment Operating: 0°C to 50°C
Storage: -15°C to 65°C
Humidity: 5% to 95% (non-condensing)
Altitude: 0 – 10,000 ft.
Weight 2 lbs. [0.90 kg]
MTBF With Power Supply:
Greater than 41,660 hours (MIL-HDBK-217F)
Greater than 114,580 hours (Bellcore)

Without Power Supply:
Greater than 250,000 hours (MIL-HDBK-217F)
Greater than 687,000 hours (Bellcore)
Certifications FCC Class A, EN55022 Class A, EN55024, CE Mark
Warranty Lifetime

Ordering Information

SKU Description  

10GBase-T RJ-45 100m to 10GBase-X SFP+ Slot (Empty)

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