• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 2. Twisted Pair > Twisted Pair Cable

2.1. Twisted Pair Cable

2.1.1. Specifications of Twisted Pair Cable

Twisted pair cables consist of copper wires of small diameters which are usually less than 0.1 inch for telephone, in-house, and office applications. Within a plastic covering shield, there are many individually insulated copper wires twisted with each other in pairs. Two wires in a tightly twisted pair experience almost the same physical environment. Therefore, radio emission and noise pickup are minimized when a differential signal is carried over the twisted pair. Furthermore, each twisted pair has its own twisting angle to minimize crosstalk between different pairs. The quality of the insulation material, the tightness and the precision of twists, and the diameter of the copper wire determine the transmission quality of a twisted pair cable.

The size of the copper wire is usually measured in American Wire Gauge. Popular wire sizes for twisted pair cables are 19, 22, 24, and 26 AWG. Table 2.1 shows metric and English equivalences of AWG from 11 to 40. The English unit is mil, which is 0.001 inch, and the metric unit is millimeter.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint