Pigtail LC/UPC SM 900UM G.652D 2M. The Pigtail from Extralink with LC/UPC connector is made on a  single-mode G.652D fiber, which is dedicated for FTTx technology. This fiber is characterized by  reduced bending radius, without increasing attenuation. This is a very important feature during the construction of FTTx networks due to the large number of changes of optical line direction and because of the small size of cabinets and distribution boxes. Pigtail is used mainly in client cable terminations in the customer's sockets and in distribution boxes.