10GBaseT to 10GBaseX Media Converter


  • 10GBaseT to 10GBaseX SFP+ converter
  • Full linespeed, low latency operation
  • Manageable
  • Loopback on Fibre and Copper
  • Supports:-
    • 10GBase-SR
    • 10GBase-LRM
    • 10GBase-LR
    • 10GBase-ER
    • 10GBase-ZR


The C4120 is a media converter module that provides an interface between 10GBase-T ports and 10GBase-X ports via an open SFP+ port,  allowing users to convert their 10Gig Ethernet ports to the cabling used in their networks. The open SFP+ port supports a wide variety of Transition Networks 10GE SFP+ fibre modules. Operating at Layer 1, the physical layer, data is passed through the converter at line speed, making the C4120 ideal for applications where low latency is essential. The ION C4120 is a manageable device when installed in a managed ION chassis.  A standalone version is also available.

The SFP port offers support for:

  • 10G copper SFP's
  • Class-I and Class-II fibre
  • SFP+ modules
  • CWDM and DWDM modules

Data Sheet


Item Description

IEEE 802.3 IEEE 802.3an EEE 802.3ae EEE 802.3az

Data Rate

10 Gbps

Dip Switches

SW1: Copper Loopback 

SW2: Fibre Loopback

SW3: not used

SW4: Transparent Link Pass Through

Status LEDs

PWR (Power): On = power is on

L/A SFP+ (Fibre 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


Width: 0.86” [21.85 mm] Depth: 6.5” [165 mm] Height: 3.4” [86.36 mm

Power Consumption

10.5 Watts - See product manual for chassis power guidelines


Operating: 0°C to 50°C

Humidity: 5% to 95% (non-condensing)

Altitude: 0 – 10,000 ft.


1 lb. [0.45 kg]


Greater than 250,000 hours (MIL-HDBK-217F

Greater than 687,000 hours (Bellcore)


FCC Class A, EN55022 Class A, EN55024, CE Mark



Ordering Information

Order Code Description
TN-C4120-1048 10GBase-T RJ-45 100m to 10GBase-X SFP+ Slot

More Information

Mounting and power options for ION System cards.

TN-ION Chassis
1 and 2 Slot chassis for ION voice and data cards
6 Slot multi service chassis
19 Slot rack for Transition Networks ION Modules
AC Power Supply Module For the ION 19-Slot Chassis
AC Power Supply Module for the ION 6-Slot Chassis
DC Power Supply Module for the ION 6-Slot Chassis
DC Power Supply Module For the ION 19-Slot Chassis