What is eia 449

I believe V. RS, pin connector Pinout and Signal names. Normally EIA and systems may not be connected together. Though never applied on personal computers, this interface was found on some network communication equipment. One of the ways in which the RS data communications standard is able to send at high speeds without stray noise causing interference is to use a differential form of signalling.

Earlier data communications standards such as RS used signalling that was referenced to earth and while this was easier to implement and cheaper to cable, it introduced limitations into the system. By using twisted wire pairs for the data lines, any unwanted noise will be picked up by both wires together. As the RS receivers use a differential input, and they are not referenced to ground, any noise that is picked up does not affect the input. This means that higher levels of noise can be tolerated without any degradation to the performance to the data communications system.

For the RS interface, ten additional circuits functions have been provided when compared to RS Only used on switched circuit connections. Known as DCD. It instructs the DCE to rapidly get ready to receive a new analog signal. It helps master-station modems rapidly synchronize on a new modem at a tributary station in multipoint circuits.

Further details. Many new features added, improved and expanded APIs, increased custom test pattern support and many many other new features. Recent purchasers and customers with maintenance contracts will be able to upgrade for free.