The OPTEL3 is usually used to extend a two wire telephone line using optical fibers. The OPTEL3-SL connects to a plain old telephone, and the OPTEL3-CO connects to a CO or PBX at the other end of the link.
It is available with either a 1×9 or SFP optical transceiver. The optical fiber pair which connects the two may be multimode or singlemode depending on the selected transceiver. In addition, it has an RS232 data port.
A dedicated voice link (order-wire) can be created by having an-SL at both ends of the link. Lifting the handset at one end causes the other end to ring.
Another version, the OPTEL3-ASL, is an analog two wire modem which transmits and receives analog signals in the 200 to 3400 Hz range. It can be used as a clear channel for PSK, FSK, DTMF, or other signals.
Fiber optic transmission offers information security, electrical isolation, lightning protection, and EMI/RFI immunity. Since the voice is digitally encoded, the quality does not degrade with distance.
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.