ION POTS Media Converter

The S6310-3340 is a stand-alone media converter that provides an interface between a twisted pair RJ-11 port and a fiber port, allowing users to connect central-office voice grade signals to
distant Plain Old Telephone equipment (POTS) utilizing standard telephone signaling. Two units are required to implement an end to end system. The first unit connects to a telephone line or
PBX and is configured to act as a telephone (FXO Mode) and has the ability to detect ringing voltages. The second unit is the reciprocal unit and is configured to have the ability to act as a
Central Office and connects to a telephone device (FXS Mode).

Together, the modules allow legacy analog phone lines to be extended over fiber for both permanent installations as well as temporary job-site installations.

NDAA Compliant

S6310-3340 Overview


  • Audio transmission of voice grade signals
  • Supports ringing at distant end
  • Supports Caller ID
  • Configurable worldwide country formats
  • Must be deployed in pairs
    – ION chassis card and stand-alone unit
    – ION chassis card and ION chassis card
    – Stand-alone unit and stand-alone unit
  • Single product configurable to either FXO mode or FXS mode
  • Automatic Ring Down supported when both converters are configured to FXS Mode
  • SFP based product
    – Uses Gigabit Ethernet SFP Modules
    – Lantronix offers a wide variety of SFP modules to support multimode or singlemode fiber, as well as dual or single strand fiber installations
  • Supports in-band management of remote stand-alone unit when linked to a POTS
    slide-in-card installed in a managed ION chassis
  • Electrical interface is provided through an RJ-11 female connector
  • Only supports analog POTS lines
  • Compatible with traditional telephone modems


  • Provides voice grade service to extend useful life of legacy analog telecom equipment
  • Acts as a telephone and connects to a telephone line or PBX
  • Acts as a central office and connects to a telephone device
  • For use in permanent or temporary job-site installations

S6310-3340 Tech Specs


  • FCC Part 68
  • ETSI ES 203-021 (TBR21)
  • ISED CS-03

Analog Port

  • Connector: RJ11

FXS Mode

  • Impedance: 600 ohms
  • REN: 1.0
  • Ring Cadence: 25 Hz

FXO Mode

  • Impedance: 600 ohms
  • Battery Source: 48 VDC +/- 5V
  • Ringing Supply: 90Vp-p
  • Ring Frequency: 16-65 Hz

Dip Switches 

  • SW1 Up = FXO Down = FXS
  • SW2 Up = Normal Down = FXS Reversed
  • SW3 Up = U-Law Down = A-Law
  • SW4 not used
  • SW5 – SW8 Country Code Select

Status LEDs 

  • Pwr: On = power is on
  • FL: On = fiber link is up
  • ACTC: On = Off-Hook, Blink = Ringing, Off = On-Hook


  • Width: 3.25” [82 mm]
  • Depth: 6.5” [165 mm]
  • Height: 1.0” [25 mm]

Power Consumption

  • 2.0 Watts without the SFP

Power Supply 

  • External AC/DC provided; 12 VDC, 1.25A Output
  • Unregulated, UL Listed


  •  Operating: 0°C to 50°C
  • Storage: -40°C to +85°C
  • Humidity: 5% to 95% (non-condensing)
  • Altitude: 0 – 10,000 ft.


  • 2 lb. [0.9 kg]


  • Emissions: EN55032 Class A, FCC Part 15 Class A
  • Immunity: EN55024
  • Safety: CE Mark


  • Lifetime

S6310-3340 Downloads

Firmware Downloads

Keep your products up to date by downloading the latest firmware. You must log in or create a MyLantronix account to download firmware. 

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