Fiber optical patch cords can be also named as jumper cable. Each of its two ends is equipped with a plug to make the optical connection lively. It is called as pigtail when only one end is equipped. The connector of the conventional single mode patch cord has several types (FC SC ST LC MU MTRJ). Meanwhile its end surface has three types (PC UPC APC). The cord, with different connector or end surface for its two ends, is known as single mode transmission patch cord.