This male-to-female LC/UPC attenuator has an attenuation value of 7 dB and is well suited for fiber amplifier, DWDM and telecommunications equipment. It features high optical power endurance and complies with Telcordia (GR-910-CORE and GR-1221-CORE). Attenuating Material-ion Doped Fiber 1260 to 1620nm Wavelength Singlemode Attenuators Precision Polishing for Reduced Back Reflection See more Specifications Connectivity. L-com offers an extensive line of dual wavelength (1310/1550nm) Singlemode fiber optic attenuators. Constructed of the highest quality materials and. GPON OLT C+++ 7dB Rx1310nm Tx1490nm 20km Optical Module with SC Connector Features: Support ITU-T G. 2 GPON OLT C+ application Single fiber bi-directional data links with symmetric 2.