Contact Closure Fibre Converter


  • Provides transmission of contact closure over a fibre optic link
  • Point-to-Point transmission architecture
  • Relay output follows the “relay input” from the remote end
  • Plug-and-play design ensures ease of installation requiring no electrical or optical adjustments
  • Indicating LEDs are provided for confirming equipment operating status
  • SNMP & Web management when placed in FRM220 chassis with NMC


The FRM220-CCF contact closure fibre converter comes in two versions, one with 2 channels (CCF20) and one with 4 channels (CCF40) and provides transmission of contact closure over a single fiber optic link. An SFP slot  provides for a wide variety of fibre options - multi-mode and single-mode, as well as BiDi which allows bi-directional transmission using only a single fiber core. 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 one of the relay outputs can be configured to close when “carrier loss” is detected from the remote end. (Either through a CH01M console or via NMCin managed chassis.) 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.

Contact closure relay over fibre


Item Description

Contact Interface 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


1 x SFP/LC (155m)


Optical SFP-LC, Contact, Terminal Block

LED Indicators

Contact Relay, Carrier Detect


Operating Voltage Range 8 to 15 VDC
Power Consumption 4W Max

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)




>100,000 hours

Operating Temperture

0˚C to +50˚C

Storage Temperture

-10˚C to +85˚C

Relative Humidity

0% to 95% (non-condensing)¹

Ordering Information

Order Code Description
CT-FRM220-CCF40 4ch Contact closure fibre converter
CT-FRM220-CCF20 2ch Contact closure fibre converter

More Information

Chassis and mounting options for the FRM220 family.

AC and DC power options available.  See individual products for further details.

1 Slot standalone chassis for ISDN, voice or data modules, AC or DC
1 Slot chassis with DB9 console port for Ethernet, voice or serial cards
2 Slot Ethernet, ISDN and serial chassis with console port
2 Slot chassis manageable via NMC card
4 slot Ethernet, ISDN and serial chassis, 1U
8 Slot multi service rack, 1U
20 Slot multi function chassis with Ethernet, serial and ISDN, 2u
20 Slot Ethernet aggregation rack, 2u
Product Category