Parallel Line Internet Protocol (PLIP)

In this article we will discuss PLIP, will make brief discussion on PLIP, In last article we discuss about SDLC.

The Parallel Line Internet Protocol is a computer networking protocol for direct computer-to-computer communications using the parallel port normally used for connections to a printer.

The Parallel Line Internet Protocol provides Link Layer services for the Internet Protocol, the protocol used for forming small local area network sand large computer networks, such as the Internet, enabling computers without standard dedicated networking hardware, such as Ethernet, but with older parallel port devices, to communicate.

The Internet Protocol Suite is the standards-based networking model and software specification for forming small and large computer networks, from local area networks to global communication systems, such as the Internet. It is usually implemented by software and hardware features that use Ethernet network interface cards, cabling, and networking switches or hubs.

Early personal computers did not have Ethernet hardware included in their design and bus adapters were initially expensive. A solution to was to use the, at the time, standard parallel port, typically used for connection to a printer or similar output device. The ports on two computers are connected with a so-called null-printer cable, sometimes called a LapLink cable.

The laplink cable connects five output pins of a parallel port to five input pins on the opposing port, for each direction. Due to the lack of an internal timing in the parallel ports, synchronization is implemented via software handshaking: four of the five pins are used for data transfer and one is used for synchronization.

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