Since fiber optic cable networks are constructed by drawing long lines of physical cables, it is not possible to lay down continuous cables end-to-end. The fiber pigtail (one of the cable assemblies) then has a connector on one end and a bare optical fiber on the other end that melts with the cable. By fusing glass fiber cables together, it achieves the minimum insertion loss. One end of the pigtail is terminated with a connector and the other end is usually connected to an OSP (outdoor cable). They may be simplex: (single fiber), or multi-fiber up to 144 fibers. Pigtails do have male and female connectors, where the male connector will be used to plug directly into the optical transceiver while the female connector will be mounted to a wall mount or patch panel. Fiber pigtails are typically used to connect central office or head-end patch panels with OSP cables. Often they may also provide connectivity to another splice point outside the headend or central office. The purpose of this is because a variety of jacket materials can only be used within a limited distance inside the building. The fiber closure is connected to two optical cables, which need to be precisely aligned to the paired optical fiber core or spot in an optical cable. This may require ensuring that almost all of the light is coupled from the fiber optic cable to a different light source. Fiber optic cables can be terminated in cross-connect panels using pigtails or field-mounted connectors. Fiber termination technology. The pigtailing method requires making the connector and using the connector tray in the terminal block. Braid approach provides the best quality connection, usually the fastest. Fiber Closure contains fiber optic holders for the installation of two-electrode optical fibers. The inspection microscope helps hold the prepared fiber end in the fusion machine. Put the fiber into the fiber fusion splicer holder, align it, and blend it together. Since the heating elements fuse or fuse the fibers together, a nickel-chromium alloy wire is used as the welded joint. The new splicer has replaced the nichrome wire with a fractional carbon dioxide laser, electric arc or gas flame to heat the ends of the fiber and fuse them together.