New observing System to support VDIF specifications with 10 GbE for VERA, JVN and KJJVC

Tomoaki Oyama, Yusuke Kono, Noriyuki Kawaguchi from NAOJ Moritaka Kimura, Mamoru Sekido from NICT

Japanese real-time VLBI network OCTAVE (Optically Connected Array for VLBI Exploration) has been developed VLBI observation Systems (OCTAVE-Families) to support the VDIF specifications. The Octave systems consist of a high speed 8-Gsps 3-bit ADC (OCTAD) enable us to acquire not only wide intermediate frequency but also radio frequency up to 50 GHz, a converter (OCTAVIA) between one 10 GbE port and four 2 Gbps input and output ports conformable to VSI-H and new recorders (OCTADISK and OCTADISK2) at a rate of 4.5 Gbps and above 8 Gbps with 10 GbE and high speed software correlator system (OCTACOR) using GICO3 was developed by NICT. These OCTAVE systems are connected with VDIF (Vlbi Data Interchange Format) specifications via 10 GbE network. These components are used for VERA, JVN(Japanese VLBI network) and KJJVC (Korea-Japan Joint VLBI Correlator). We will report the detailed performances and results of test VLBI observations.