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Maximum flash sync speed. The maximum flash sync speed is the fastest shutter speed at which the entire image sensor can be illuminated by flash pulse. Most modern digital SLR cameras have maximum flash sync speed of ~1/250 of a second. A few camera models (e.g. Nikon D70(s), D50) have maximum flash sync speed as high as 1/500s. This duration is the upper limit of the flash pulse duration.
We measure transfer speeds in bits because that is how data is transferred, bit by bit. Depending on the tech, it may take more or less bits to travel the data over the link. For example, PCI Express 2.0 uses 8b/10b encoding to transfer data; this means for every byte you transfer over the link, 10 bits get transferred. To convert a speed from Mb/s to MB/s you would simply divide the number by 8 (8 bits in a byte). This does not factor in overhead.