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| LapLink cable ： ウィキペディア英語版 |
LapLink cable
A Laplink® Cable (also known as ''null-printer'' cable) is a cable that allows one to connect two computers together to establish a direct cable connection. The connection is achieved via the parallel ports or USB port on the two computers. No networking hardware (such as a network interface card or a modem) is required. The cable is named after the Laplink Software Inc. software package now known as PCmover, which was designed Laplink in 1983, formerly known as Traveling Software, to make such a connection possible. Laplink now sells 4 different cable products: the Laplink Easy Transfer cable; a USB 3.0 to SATA or IDE Hard Drive Transfer Cable; a USB 2.0 cable; and an Ethernet Transfer cable. Laplink's Easy Transfer Cable supports Windows 10 transfers.〔http://www.laplink.com/index.php/individuals/pcmover-for-windows-8/laplink-easy-transfer-cable 〕
The INTERSVR program in MS-DOS 6.0 can use a LapLink cable.
==Comparison to null modem cables==
A Laplink® cable can be seen as a parallel equivalent to a serial null modem cable. Because of the higher bandwidth of the parallel port versus the serial port, a Laplink® cable is able to shift data more quickly at the same clock speed, which was important at the time it was developed, since clock speeds then were relatively slow. This is still the reason it is used (rather than a RS-232 port) as a means to install Linux to machines without a CD-ROM/DVD station or Ethernet port built-in. It can also be used as an (additional) failover link between ha-cluster nodes.
However, the clock speed of any parallel interface is limited due to the need to synchronize all of the signals representing data bits (and, to a lesser extent, all of the other signals as well). The problem is that slight differences in the thickness, insulation, or spacing of the wires in a parallel cable can cause different signals on different wires to arrive at slightly different times (microseconds apart) at the far end of the cable, even when they were sent at exactly the same time from the near end. This time difference in parallel communication lines is called ''skew''. At very high clock speeds, these very small time differences become significant, causing an upper limit on the usable clock speed of a parallel interface. By precisely controlling cable quality, it is possible to reduce skew enough to allow higher parallel clock rates, but this becomes prohibitively expensive beyond a certain point. This was the primary reason that speed advancements ceased, and popularity declined, for the SCSI parallel peripheral interface. For this reason, high speed asynchronous serial ports are capable of higher bandwidth than parallel ports. Although, high speed synchronous serial ports suffer from the same skew problems as high speed parallel ports.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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