The Cisco 1000BASE-LX/LH GBIC fully complies with the IEEE 802.3z 1000BASE-LX standard. However, its higher optical quality allows it to reach 6.2 miles (10 kilometers) over single-mode fiber (SMF), compared with the 3.1 miles (5 km) specified in the standard.
Cisco 1000BASE-LX/LH long haul GBIC (SM/MM), 1000 Mbit/s, 1000Base-LH, 1000Base-LX, 10000 m, 1300 nm, 0 - 50 °C, -40 - 85 °C
Cisco 1000BASE-LX/LH long haul GBIC (SM/MM). Maximum data transfer rate: 1000 Mbit/s, Cabling technology: 1000Base-LH, 1000Base-LX. Maximum transfer distance: 10000 m, Wavelength: 1300 nm. Data link protocols: Gigabit Ethernet, Dimensions (WxDxH): 8.5 x 13.4 x 56.5 mm, Connector(s): LC