The single channel Fiber Optic Modem (FOM) is currently available in four standards based communications interfaces: The standard U.S. Army FOM MD-1272/G, Eurocom D/1 Interface B, E3 and DS3.

The multi-channel Fiber Optic Modem (FOM) is available in E1(ITU 9.703) and EuroCom D/1 interface B. They accept multiple electrical inputs which are multiplexed and converted to a single optical signal for full duplex transmission over the fiber optic cable.

The EuroFOM E1/16 (SM) Fiber Optic Modem is a rugged, field exposed or rack mountable unit that provides an interface between sixteen asynch-ronous full-duplex E1 signals and singlemode fiber optic cable for full-duplex, long distance and repeater-less communication.

The 108600 converts digital signals from EuroCom A/B to EuroCom C and visa versa. It is used when the distance between relevant equipment units is too long for EuroCom A/B transmissions. It is also used when equipment units with different interface types are to be connected.