Distal access balloon guide catheter system and methods for delivering implantable devices, catheters, or substances in or near andor restoring flow through body lumens, such as blood vessel lumens, or inflating balloons affixed to the distal end of the guide catheter system are described. A destination logical group node blocked crankback procedure is used by entry border nodes, in the event of a failed connection attempt, to instruct preceding routing capable nodes to route the connection over another link. By selecting the number of groups of sub-arrays into which data is written andor from which data is read, the write andor read data rate is varied. The encrypted data is accessed at the server system.