SNA provides flow control protocols for both sessions and virtual routes, based on pacing window techniques. Although the same mechanism is used in both protocols, the purpose of each pacing protocol is different. To match the rate at which an LU can receive data from another LU, bidirectional pacing of the session between LUs (is defined in SNA. The two pacing stages in each direction allow traffic-rate matching for transmission both through the backbone network (of subarea nodes) and to the attachedpe ripheral node.
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George et al. (1982) studied this question.