The FOM-8H is a high speed fibre optic modem operating full or half duplex over fibre optic cable. It has a range of 4 km (2.5 miles) at data rates up to 56 kbps or 64 kbps.The FOM-8H has diagnostic capabilities complying with the ITU V.54 standard. Two loops are available: local analog loop and remote digital loop. These are activated by a manual switch or by toggling the corresponding pins of the DTE interface (not applicable with X.21 interface). Transmit timing is provided by one of three alternative sources:- internal oscillator- loopback clock derived from the receive signal- external clock from the terminalThe carrier can be strapped for either continuous or switched operation, controlled by the RTS signal.Several interface options are available: RS-232/V.24, RS-530, X.21, or V.35. The modem has LED indicators for TD, DCD, TEST, and POWER. The FOM-8H is packaged in a lightweight plastic case. 
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