D-sub is short for D-subminiature. This form is no longer used, as these connectors are no longer considered miniature in computing terms; indeed they are among the largest plugs used in computing. The D does not stand for digital. Instead, it comes from the connector's creators, ITT Cannon, who used the D to indicate that the pins are housed in a D-shaped shell. This D is then followed by another letter denote the size of the plug and socket in terms of the capacity of pins that can be housed, then a number showing the number of pins used.

Manufacturing Technique

• Male+female generally refers to both ends of a complete set of connectors or extension lines, with pins on the male plug and holes on the female socket.
• DB9F 9 pin Serial DB9 Female to DB9 Female Connector. - 2 serial ports can transfer the data between 2 serial devices. For Cross wired canbe design which can ensures no conflict in data transmission and a reliable serial connection.
• Widely used in various connectors and connectors such as computers, instruments, machines, electrical appliances, LED displays,automobiles, color TVs, air conditioners, DVDs, VCDs, etc.