The OM44 fiber optic modem transmits serial asynchronous or synchronous data over a pair of optical fibers. The interface can be set to EIA-530/A (RS-422 level), V.35,or RS-232. Data, two clocks, and all handshake lines are passed across the link.
The modem is data rate transparent from DC to 2.048 Mbps and can supply an internal clock at 13 common frequencies for synchronous applications. The modem acts either as a DCE or as a DTE. Local and Remote Loopback can be initiated with front panel switches.
All option settings are accessed externally. The OM-44HSM is a heavily shielded version of OM44; it has an RFI tight case and extra power supply filtering for very low EMI/RFI emission.
We're very happy with the multiplexers that you supplied. The nature of the customer’s installation means that we won’t hear general feedback unless things go wrong – we’ve not received any complaints so assume that there have not been any problems. We found the equipment straight forward to set up using the supplied documentation.