A patch cord is a network cable with two end connectors (crystal heads or modules), also known as a finished network cable. Also classified like Ethernet cables: CAT3 CAT5E CAT6 CAT6A CAT7 CAT8, etc., composed of Ethernet cables, crystal heads, and crystal head protective covers. In addition to the conventional circular patch cord, there are two types of network patch cord, namely ultra-fine patch cord and flat patch cord.