802.15.4 question

Digi One IA/IAP
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  1. As I know, ZigBee uses CSMA-CA method for accessing channel. If some nodes which are in different channel generate and transmit packets to coordinator simultaneously, then coordinator can process all packets simultaneously or save packets in queue and process packets in order?

  2. ZigBee Pro uses Stochastic Address Assignment Management(SAAM). I wanna know about the network structure in SAAM. Its structure is cluster-tree or not? If it uses cluster-tree structure, then it is also multi-hop structure and then I think there is no advantage in SAAM with DAAM(Distributed AAM) because of network delay. Is it right?

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This question is in the wrong section of this forum.