This is a 20.0m (65.6ft) LC (male) to ST (male) yellow OS2 duplex plenum-rated patch straight cable that is used for high speed data transfer. OS2 is a standard single-mode optical fiber commonly used with wavelengths of 1310nm and 1550nm (9/125 microns) and has a maximum attenuation of 1dB/km. The OS2 standard is defined in ISO/IEC 11801. Plenum-rated cables must self-extinguish and prevent re-ignition. Duplex cabling provides two-strands of fiber and is most commonly used in applications that utilize one lane to transmit and one lane to receive. Our patch cables are 100% compliant for all of your networking needs and are guaranteed by federal law to not affect or void OEM warranties.