Relay Contact Fibre Converter




  • Transmits contact closure over a fibre optic link
  • Point-to-Point operation
  • Distances up to 120km
  • Relay output follows the “relay input” from the remote end
  • Relay contact for Carrier Detect, N.C. (Normally Closed)
  • SNMP & Web management option


The FRM220-CCF-SA contact closure fibre converter comes in two versions, one with 2 channels (CCF20-SA) and one with 4 channels (CCF40-SA) and provides transmission of contact closure over a single fiber optic link.  An SFP slot  provides for a wide variety of fibre options - single or multi-mode , as well as BiDirectional which allows transmission using only a single fiber. The FRM220-CCF has contact inputs and 0.5 amp contact output relays. The relay output follows the “relay input” from the remote end. When the remote “relay input” is shorted, the local relay output is closed and vice-versa.  Any  of the relay outputs can be configured to close when “carrier loss” is detected from the remote end.   Carrier Loss indicates that the optical fibre is disconnected or that the remote end has lost power and is not operating. This "carrier loss" relay can then be connected to an appropriate alarm circuit.

This unit is fully interoperable with the chassis mounted FRM22-CCF40/20 card versions.


Contact closure relay over fibre


Item Description

Contact Response Time : 4 msec
Input:  Dry Contact Closure
Output:  SPST Relay, <30 VDC @ 0.5 A, Resistive loads only.
0.5 A Contact Rating - normally open


Optical SFP-LC, Contact, Terminal Block


Contact Relay, Carrier Detect



Electrical & Mechanical

Current Protection Automatic Resettable Solid-State Current Limiters
Circuit Board Meets IPC Standard


155 x 208 x 88mm (D x W x H)




>90,000 hours


Operating:  0˚C to +50˚C

Storage: -10˚C to +85˚C

Relative Humidity

0% to 95% (non-condensing)

Ordering Information

Order Code Description
CT-FRM220-CCF40AC 4ch Contact closure fibre converter - AC powered
CT-FRM220-CCF40DC 4ch Contact closure fibre converter - DC powered (18-72V)
CT-FRM220-CCF20AC 2ch Contact closure fibre converter -- AC powered
CT-FRM220-CCF20DC 2ch Contact closure fibre converter - DC powered (18-72V)

More Information