iConverter® X21

X.21 Serial to Fibre Media Converter

iConverter X21

The iConverter X21 is a X.21 or RS-530 serial to fibre media converter, available as a compact, unmanaged standalone unit or a managed chassis plug-in module, supporting several configuration modes to enable connections with a wide variety of X.21 and RS-530 devices.

In applications where performance and security are critical, the iConverter X21 provides the reliability and connectivity features necessary for enterprise and military applications, including radar control from remote distances.

The X21 supports multimode and single-mode dual fibre with ST, SC and LC connectors, and single-mode single-fibre with SC connectors.
Standard, CWDM and DWDM SFP transceivers are also supported, enabling adaptability to different fibre types, distances and wavelengths, providing maximum flexibility across a variety of network architectures and topologies.

The iConverter X21 can auto-detect and configure itself to match the baud rate of the connected devie up to 8.192Mbps, also supporting standard DCE-sourced timing and terminal timing.
The X21 also supports RS-530 DCE and DTE co-directional timing, Tx and Rx data and two control lines.

The iConverter X21 media converters are available as compact unmanaged standalone units, or vhassis plug-in modules that can be managed with a Management Module (NMM2) or Network Interface Device (NID) installed in the chassis.

Available when an external AC to DC power adapter or with a 2-pin terminal connector for DC power, the iConverter X21 can be DIN-rail mounted using the optional mounting bracket or mounting clips.

Chassis mounting options include 1, 2, 5 or 19 module chassis for maximum flexibility.


  • X.21 and RS-530 Serial to Fibre media converter
  • Auto-configuration of baud rates
  • DCE-sourced or terminal clock modes
  • Supports serial data rates up to 8.192Mbps
  • Included adapter cable used to provide desired serial interface gender
  • Small Form Pluggable (SFP) transceivers with Optical Statistics for standard, CWDM or DWDM wavelengths
  • Fixed-fibre connectors support multimode, single-mode dual fibre with ST, SC and LC connectors, and single-mode single-fibre with SC connectors
  • Extends network distances up to 120km
  • Features local loop-back for easy testing of fibre and serial interfaces
  • Plug-in modules are hot-swappable in 19-Module, 5-Module, 2-Module or 1-Module chassis
  • Management is available with the addition of a management module to the chassis
  • SNMP management via NetOutlook® provides real-time port and module status information, remote parameter configuration and trap notification
  • Commercial (0 to 50°C) and wide (-40 to 60°C) temperature ranges
  • Made in the USA
  • Lifetime Warranty and free 24/7 Technical Support
 iConverter X21
 X.21 Serial to Fibre Media Converter
Standard Compliances
ITU-T X.21
Regulatory Compliances


UL, CE, FCC Class A

EnvironmentalRoHS, WEEE, REACH
Data Rates
auto detect up to 8.192Mbps
Port Type
DB15F High Density
ST, SC and LC
Single-fibre SC, SFP
Cable Types
24 gauge (typical)
Multimode: 50/125µm, 62.5/125µm
Single-mode: 9/125µm
AC Power RequirementsAC Adapter100 – 240VAC/50 – 60Hz
0.05A @ 120VAC
DC Power Requirements
DC Input: 

DC Input:
(Terminal Block)
DC Input:
(AC Adapter)
3.3VDC, 0.5A @ 3.3VDC

5 – 32VDC, 0.3A @ 9VDC
2-pin Terminal (non-isolated)
5 – 32VDC, 0.3A @ 9VDC
2.5mm Barrel Connector
(W x D x H)
Plugin (mm): 
21.6 x 114.3 x 71.1 
w/o Adapter
w Adapter
226.8 grams

453.6 grams
680.4 grams
    0 to 50°C
-40 to 60°C
 -40 to 80°C
 5% to 95% (non-condensing)
 -100m to 4,000m
MTBF (hrs)
w/o Adapter:
w/ Adapter: 

Lifetime warranty with 24/7/365 free Technical Support

The iConverter X21 serial to fibre converter provides a secure and safe environment for controlling high security or hazardous environments by extending the distance between locations up to 120km over single-mode fibre.

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