AS2477 - MM Fibre to 4W E&M Rack mount Card
The fibre to Audio & Signalling adaptor can provide conversion for both options on the one PCB.
The unit can also be factory configured for operating on Singlemode or Multimode Fibre.
The units can be connected as shown below to provide a audio path extension or likewise to mimic a dry contact (for PTT etc) between two locations.
Local signal connections and DC power are presented on a DIN41612, fibre is via ST connectors.