The OTR-301-D is a compact, cost effective fiber optic extender pair capable of extending HD video up to 3G-SDI with serial data over fiber. Extend signals from 270 Mbps up to 3 Gbps over 30 Km on a single SM fiber. Meets SMPTE SDI standards maintaining error free transmission of SMPTE 424M, 292M, 259M and ASI over the entire 30 Km distance. The OTR-301-D provides error free transmission with RP 198 pathological patterns. Along with SDI video, bi-directional RS-232/422/485 serial data and tally is sent on the same fiber. The units are built with a stand-alone compact enclosure making it the perfect solution for OB trucks, remote broadcast, mounting by remote security cameras or any other applications that might need a “throw down”, wall mount or shelf mounted fiber link. The OTR-301-D has an extended temperature range making it a good solution for mounting in NEMA enclosures.