FC2021 X.21 to Fibre Interface

  • Speed - 64k to 2048kb/s in 64k steps
  • Interface - X.21 (15way 'D')
  • Fibre I/F - ST connectors
  • Internal / External clock options
  • 850 & 1300nm optical options
  • Local Loopbacks
  • Remote Loopback
  • LEDs - X.21 signals, fibre status, loopbacks
  • Remote optical carrier detection
Product Description

The FC2021 provides a quick and easy way of allowing X.21 copper based equipment to interface and communicate over fibre optic circuits.

The FC2021 can be used as a straight forward fibre optic line driver. The unit can be set to operate at speeds from 64kb/s to 2048kb/s in steps of 64kb/s. The FC2021 can also be used to onward link an X.21 network over a fibre optic network again at speeds from 64k - 2048kb/s through the use of the external clock facility. The unit will accept a clock from the network and synchronise to it. This facility allows the FC2021 to onward link an N*64k channels from a network over a fibre circuit. The other unit can be set to recover timing information from the fibre optic signals, thus ensuring full synchronisation across the complete network. If one unit is incorrectly set so that more than one clock source has been detected, the master / slave light will flash indicating a clocking problem.

The front panel provides the user with the facility to apply two different loops to the unit. A single switch selects either a fibre optic loop or a bi-lateral interface loop. Alternatively a remote loopback can be applied and a front panel LED will confirm that the loop has been actioned. On the remote unit, the fibre LED will flash indicating that a remote loop has been applied to the unit.

The LEDs will also confirm that the remote unit is also receiving an optical signal thus ensuring system integrity. If the fibre LED flashes, this will indicate that the unit is receiving a signal but that the remote unit is not.

Testing G.703 circuits
  • ET2021 X.21 Tester:The ET2021 is a part of the range of pocket size testers specifically designed aiding the installation, commissioning and fault finding on X.21 high speed circuits (up to 2Mb/s) and includes an integral BERT (Bit Error Rate Tester).
Testing X.21 Circuits
  • ET2101 Fibre optic cable tester:The ET2101 enables engineers and installers to quickly identify multimode fibre optic cables and measure losses due to bad joints, broken cables etc.


FC2021 Specification

For further information please contact us