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bit parallel

The transmission of several bits at the same time, each bit traveling over a different wire in the cable. Bit parallel is the inherent nature of parallel technologies. See parallel transmission.

parallel transmission

Transmitting several bits of data simultaneously using multiple lines (8, 16, 32, 64). The pathways between the CPU and memory are parallel, and they used to be parallel between the CPU and peripheral devices. For example, parallel ATA (PATA) was replaced with serial ATA (SATA); parallel PCI was replaced with serial PCIe. See SATA, PATA, PCI and PCIe.

Why the Change?
At increasingly higher transfer rates, it is more efficient to build channels that carry data over a single wire rather than 32 or 64. For more details, see parallel vs. serial. Contrast with serial transmission. See system bus.

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