1. 1 Date Uniboard Application for Korean VLBI Network (KVN) Jae-Hwan Yeom, MiYoung Jung & Bong Won Sohn

2. 2 Contents ✤ Korean VLBI Network (KVN) ✤ East Asian VLBI Network (EAVN) ✤ Uniboard Prototype ✤ Uniboard Application for KVN ✤ wide-band spectrometer ✤ data formatter ✤ VLBI application ✤ Work list

3. 3 Korean VLBI Network (KVN) KVN-Yonsei Observatory KVN-Ulsan Observatory KVN-Tamna Observatory

4. 4 Korean VLBI Network (KVN) - East Asian VLBI Network (EAVN)

5. 5 Uniboard Prototype

6. Uniboard Application for KVN - wide-band spectrometer 5 ✤ Overview of KVN Data Acquisition System (DAS) ç Mark5B (1Gbps) DIR-1000 (256Mbps) ADS-1000 (1Gsps-2b) ADS-1000 (1Gsps-2b) ADS-1000 (1Gsps-2b) ADS-1000 (1Gsps-2b) Optical Transmission System (TX) 4ch 2Gbs/ch WDM Opt. MUX WDM Opt. MUX Optical Transmission System (RX) 4ch 2Gbs/ch Digital Filter 256 MHz -1stream ~ 8 MHz -16stream Digital Spectrometer 256~8MHz 4Kch Clock and 1PPS Distributor IF signal 1 IF signal 2 IF signal 3 IF signal 4 VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (32M-32p) ID-1 (32M-8p) VSI (32M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) VSI (64M-32p) Antenna Site Main Site SDH optical 2.4Gbps x 4-link wide-band ADS (e.g. Japan 4Gsps- 2b) Next Generation Equipments Uniboard

7. 7 Uniboard Application for KVN - data formatter 7 Recorder CorrelatorCorrelator Mark5A Mark5B Mark5C DIR-1000 VERA-2000 K-5 Optical Fiber

8. 8 Uniboard Application for KVN - data formatter Mark5A Mark5B Mark5C DIR-1000 VERA-2000 K-5 Optical Fiber DataFormatter Data Formatter CorrelatorCorrelator Mark5A Mark5B Mark5C DIR-1000 VERA-2000 K-5 Optical Fiber Data Formatter Data Formatter Uniboard case 1case 2 UniboardDASDAS

9. 9 Uniboard Application for KVN - VLBI application Mark5B Raw VLBI Data Buffer (RVDB) Raw VLBI Data Buffer (RVDB)CorrelatorCorrelator Playback System noise ↓ cable length, d < 5m noise ↓ cable length, d < 5m VSI

10. 10 Uniboard Application for KVN - VLBI application Mark5B Data Formatter CorrelatorCorrelator VSI optical possible large-scale project! Playback System Uniboard

11. 11 Work list ✤ Development of the cable connected with VSI ✤ SFP+ module - copper? glass? ✤ test item list for EVN correlator

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