That was many moons ago. As far as the end user is concerned, it means that the hardware is used more efficiently when data is transferred from the system to the card. Rather than aligning channels in the driver, which takes extra CPU cycles, channels, e.g. 1-23 for a span, are aligned in the hardware, which doesn't take extra CPU cycles.
We're onto firmware 5.x these days, I believe.
Digium, Inc. | Senior Product Manager