Gender changer

Gender changer

A gender changer is a hardware device placed between two cable connectors of the same type and gender.An example is a cable connector shell with either two female or two male connectors on it (male-to-male or female-to-female), used to correct the mismatches that result when interconnecting two devices or cables with the same gender of connector.

It is used especially for RS-232C ports in either the original DB-25 or the IBM AT DE-9 format. They are also used when extending any sort of cable that has normally plugs on both ends (rather than a socket on one and plug on the other), however in this case it is usually called just an "extender", such as with F connectors, BNC connectors, and various RJ connectors used in telephony and computer networking.

Alternative names for a gender changer are "gender bender", "gender blender", and "gender mender".

Technically speaking a gender changer is a small device or adaptor that changes the "sex" of computer cables. It has two sides with holes or two sides with pins, making any connection between port and computer cable a possibility. The holes are female and the pins are male

Null modem

In serial communications, there exists a type of adapter that is similar in appearance to a gender changer, and in fact may provide the function of changing the gender, but is not the same thing. This device is called a null modem. Despite the word modem appearing in the name, it is not a modem. Rather, it is a device with the appearance of a gender changer that imitates the presence of a modem.

A normal gender changer simply changes the gender without rerouting any pins. Therefore, pin 1 connects to pin 1 on the other side, pin 2 connects to 2, pin 3 connects to 3, and so forth.

A null modem reroutes wiring so that two serial devices may connect directly to one another without any communications hardware (see RS-232). For example, a null modem crosses pins 2 and 3, so that pin 2 on one side is connected to pin 3 on the other. This causes the "transmit" from each side to be routed into the "receive" side of the other, similar to how a crossover cable is used in Ethernet to connect two devices directly without a hub or switch. Two to three other pairs are similarly crossed in a null modem.

A null modem may also act as a gender changer if it has the same gender connector on both sides. Other null modems have a different gender on each side. It is important to recognize that a null modem used in place of a gender changer (or a gender changer used in place of a null modem) will result in an inoperable connection, even if the connectors physically fit.

Because of the significance of this distinction, gender changers and null modems for serial communications are typically labeled with the words "Gender Changer" or "Null Modem" to clarify the internal wiring.

References

* [http://catb.org/~esr/jargon/html/G/gender-mender.html "gender mender" from The Jargon File]


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