advantages of serial communication over parallel communication

Advantages Of Serial Communication Over Parallel Communication 32 Bit PCI Bus

With a parallel transmission you can transfer one word per cycle (e.g.

This cannot be guaranteed for high frequencies, as you cannot guarantee that the signal transit time is equal for all signal lines (think of different paths on the mainboard).

Hence the receiver has to wait until all signal lines are settled obviously, waiting lowers the transfer rate.

The higher the frequency, the more pronounced crosstalk gets and with it the higher the probability of a corrupted word and the need to retransmit it.

And it is more cost efficient to make one line stabilize 10 times faster than to add 10 lines at the same speed.

By doing that each line does not need to be in perfect sync with the other lines, just as long as the controller at the other end can reorder the packets of data as they come in using the correct order.

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Eg: SATA over Parallel ATA IDE The SCSI interface is also being transformed into serial.

What makes the parallel communication faster is that multiple bits are transmitted simultaneously, whereas bit by bit transmission occurs in serial.

The serial communication may be faster than the parallel one, provided the bits leave the transmitting device at a much higher speed.

An example of such is the ATA 2 Serial port that however serial can reach a transfer rate of up to 300 MBs, while the traditional IDE port P-ATA goes to 133 MBs at the most.

The complications of using Parallel data transfer is that that many wires are required as the width of bus.

Advantages Of Serial Communication Over Parallel Communication 32 Bit PCI Bus

E.g: A 32 bit PCI bus would have 32 wires and the controls are required for each.

Also, as the speed of data transfer increases, the e.m disturbances also increases, making parallel data transfer very difficult.

That makes it possible for the simultaneous transmission and reception of data.

Such architectural difference alone makes the serial communication about twice as fast as the parallel communication.