Communication--Serial port and port

Serial Port and Port:
The serial port receives and sends one bit at a time, and the multiple data paths are sent or received simultaneously, and the port does not necessarily have a higher efficiency than the serial port; The name contains the meaning of the serial port:
Usb:universal serial bus SAS: serial attached SCSI SATA: serial ATA PCIe is also a serial port; 1. The restriction of the port communication the bit on each data path is not required to be synchronized, but when it arrives at the receiving end, the fast bit must wait for the slow bit to be delivered; Crosstalk: crosstalk (note crosstalk occurs in parallel port communication, not serial port): Crosstalk is the coupling between two signal lines, The mutual inductance and capacitance between the signal lines cause the noise on the line. The coupling current is induced by the capacitive coupling, and the coupling voltage is induced by the inductive coupling.
Although the performance of twisted pair has been continuously improved, but there is a parameter like the ghost has been accompanied by twisted pair, and with the development of twisted pair, this parameter is more and more important. This parameter is ——-crosstalk (Crosstalk). And the mouth: occupy a large number of pins to support the transfer of the port;