The end system is ATM-attached. In the most rudimentary implementation the end systems do all ATM work. In most cases a CIF attachment device will be an ATM switch with a new interface type. However it could be just about anything. I'm a little puzzled by this idea.
Small cells reduce latency.
For VCs where latency is an issue, only one cell payload need be sent per frame. Multiplex different channels on Advantage defeated. All of the QoS options will be available. ATM VCs full duplex capable. I think this just means that everything runs better if full duplex.