VLBI observation systems “OCTAVE-Families” to support VDIF specifications with 10 GbE for VERA, JVN and Japanese e-VLBI (OCTAVE)

NAOJ has 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/output ports conformable to VSI-H and new disk recorders (OCTADISK) at up to 4.5 Gbps with 10 GbE. The OCTAVE systems are connected via 10 GbE network with VDIF (Vlbi Data Interchange Format) specifications. These components will be used for VERA, JVN, Japanese e-VLBI (OCTAVE) and KJJVC (Korea-Japan Joint VLBI Correlator). We will report the detailed performances and results of test VLBI observations.