From BBN Report 1966: “The UCLA computer center and the facilities developed by UCLA for processing network measurement information were made available to us for an extended period of time. In addition, UCLA prepared a stand-alone test program for the XDS Sigma-7 computer to help us in our testing.”
The testing showed that insufficient reassembly buffers at a destination IMP could lead to intermediate IMP congestion. Eight or 16 reassembly buffers were insufficient; 32 appeared sufficient. A phase-lock condition in message transmission and timeout was detected and removed. It was possible to send 80kbps traffic from UCLA to SRI, showing that the routing algorithm was able to make simultaneous use of both paths (one direct, one via UCSB).