The Artel XA/RA-1900A and XR-1900 fiber optic systems are ideal for applications used in military and aerospace industries, transmitting IRIG and similar NASA and NBS standard instrumentation time-code formats over standard multimode or singlemode fiber at 850 nm or 1310 nm. XA-1903-1 Transmitter, 850 nm, Multimode, ST . Number of fibers 10. Box version.