Sliding Sub-Window Protocol in the Systems Network Architecture
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
This article describes a protocol for resequencing in the Systems Network Architecture (SNA) Virtual Route (VR) that efficiently integrates with the existing window flow control protocol. In SNA, message streams of a certain session may go out of sequence while traversing Transmission Groups (TGs) that contain multiple physical links. Today, the resequencing of messages is carried out at the TG receiver. However, instead of resequencing messages at every hop in the network, it is substantially more efficient, in terms of the response time/throughput seen by end users, to resequence once at the VR receiver [*]. However, this reassignment of function may cause increased buffer requirements at the VR receiver as follows.