Enhancing Network Infrastructure for e-VLBI Observations

Figure 1: Schematic of traditional VLBI observation

Figure 2: Example illustrating how VLBI can produce ultra-high resolution images of the core of a radio source. This example show how VLBI can zoom into the very core of the giant radio galaxy NGC6251, at a distance of ~100 megaparsecs from Earth; the lower zoomed image is a VLBI image of the core where 1 parsec corresponds to ~2 milliarcseconds (1 parsec=3.26 light years).

Figure 3: Plot of the VLBI-measured distance between the Westford antenna in Westford, MA and an antenna in Wettzell, Germany over a period of ~10 years; the measured change rate of 17 mm/yr corresponds closely to the actual Atlantic seafloor spreading rate!

Figure 4: Mark 5 VLBI Data System

Glownet, Bossnet, MAX, NASA/HECN network segments Figure 5: Schematic of Gbps e-VLBI demonstration experiment

Figure 6: Details of the e-VLBI network path

Figure 7: Glownet (also showing connection to Bossnet)

Figure 8: Equipment in the Glownet infrastructure

Figure 9: Bossnet routes (showing hut locations)

Figure 10: ISI-E network infrastructure

Figure 11: Simple schematic of MAX network

Figure 12: Detailed MAX Participant and Network Connections

Figure 13: Throughput vs. time for test run D

Figure 14: Traffic analysis of sustained tests (from Extreme 5i switch in data path)

Figure 15: Correlation results of e-VLBI test observation

Enhancing Network Infrastructure for e-VLBI Observations