C6120 Series

ION DS1 – T1/E1/J1 Network Interface Device Module
4 x DS1 – T1/E1/J1 + 10/100 Ethernet over Fiber

  • C6120-Series
  • C6120-1040
  • C6120

The ION C6120 is a managed T1/E1/J1 mux media converter module that provides a solution for those users that need to extend multiple T1/E1/J1 connections, along with a 10/100 Ethernet connection, all over fiber. The C6120 includes (4) RJ-48 ports, (1) 10/100 Ethernet port, and (1) fiber port. The device is available in versions that support fixed fiber connectors as well as SFP fiber modules offering support for a variety of fiber types, distances, and wavelengths to provide maximum flexibility across a variety of network topologies. CWDM SFPs can also be utilized to further increase the bandwidth capacity of the fiber infrastructure.

The C6120 converter must be used in pairs. A typical installation will include a modular card installed in a managed ION chassis linked over fiber to a stand-alone S6120 in a remote location.

C6120 Series

C6120 Series Overview


  • (4) RJ-48 copper interfaces
  • (1) fiber interface (fixed or SFP)
  • (1) RJ-45 10/100Mbps Ethernet port
  • Auto-MDI/MDIX
  • Pause (Flow Control on Ethernet port)
  • Loopback via test set
  • Local and remote loopbacks
  • LEDs for device status and troubleshooting
  • Settings for line code, line build out, loopbacks and Alarm Indication Signal (AIS)
  • Access to complete status and configuration on local and remote device
  • Remote firmware upgrade
  • Remote management
  • Must be used in pairs

C6120 Series Tech Specs


    • ANSI T1.102
    • T1.403
    • T1.408
    • ITU I.431
    • G.703
    • G.736
    • G.775
    • G.823
    • ETSI 300-166
    • ETSI 300-233
    • TBR 12/13
    • AT&T Pub 62411
    • IEEE 802.3™-2008

    Data Rate

    • Copper ports (RJ-48): T1(J1) = 1.544Mb/s,
    • E1 = 2.048Mb/s
    • Ethernet port (RJ-45): 10/100Mbps
    • SFP port(s) (empty): 100Base-X/OC-3


    • Numerous switch settings for line coding, line build out, loopback and AIS

    Status LEDs

    • Power, Port Status, Loopback and AIS


    • Width: 1.72” [44 mm]
    • Depth: 6.5” [165 mm]
    • Height: 3.4” [86 mm]

    Power Consumption

    • 6 Watts (max: dual fiber model)
    • 5.5 Watts (max: single fiber model)


    • Environment specs are dependent on the chassis chosen
    • Operating: 0°C to 50°C
    • Humidity: 5% to 95% (non-condensing)
    • Altitude: 0 – 10,000 ft.


    • 1 lb. [0.45 kg]


    • 687,500 hours (Bellcore)


    • EN55022 Class A, EN55024, CE mark


    • Lifetime

C6120 Series Resources

Application Spotlights
Press Releases
Case Studies

C6120 Series Downloads

Note: Some Documentation may have Transition Networks named or pictured. Transition Networks was acquired by Lantronix in August 2021. Learn more about the acquisition here.


Firmware Downloads

C6120 Series Firmware and Release Notes

C6120 Series Part Numbers

C6120-1014 C6120 Series

1310nm single mode (SC) [20 km/12.4 mi.] Link Budget: 16.0 dB to (4) RJ-48 [1.5 km/0.9 mi.] plus 10/100Base-TX (RJ-45) [100m]

C6120-1040 C6120 Series

*1 SFP port (Empty)to (4) RJ-48 [1.5 km/0.9 mi.] plus 10/100Base-TX (RJ-45) [100m]

Lantronix Part # Name Description Order Now

*SFP port uses standard 100Base-x/oc-3 SFP

Compatible Accessories

Lantronix Part # Legacy Part # Name Description Order Now
SFP Modules SFP Modules See Relevant SFP Modules