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Portable Broadband Seismology

Portable Broadband Seismology. Part 5: Communication Options. Jakarta, Indonesia May 11-13, 2006 Bruce Beaudoin Marcos Alvarez. Communication Options. VSAT. Private vs Internet Accessibility Link Tuning Caveat Packet “eating” UDP checksum rain fade Modem hangs High power (>20W)

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Portable Broadband Seismology

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  1. Portable Broadband Seismology Part 5: Communication Options Jakarta, Indonesia May 11-13, 2006 Bruce Beaudoin Marcos Alvarez

  2. Communication Options

  3. VSAT • Private vs Internet Accessibility • Link Tuning • Caveat • Packet “eating” • UDP checksum • rain fade • Modem hangs • High power (>20W) • Data rates: 256Kbps

  4. VSAT Telemetry Deployment VSAT Terminal

  5. DC Powered VSAT Site

  6. Station Communications Layout • Seismic site and VSAT Communications separate wherever possible - data linked by radio • Reduces power needs for remote site • Decreased induced cultural noise from electronics and wind • AC power for satellite system in most cases Seismic vault layout Comm system layout • <3 Watts DC power • 75 W solar array • ~2 m vault depth • 25 Watts DC power • AC preferred or 500 W solar array • Up to 50 km radio range

  7. VSAT Regional Site VSAT install near barn with AC power Remote site uses RF radio to telemeter date to VSAT

  8. Cell Modem • Availability of service • Service providers prefer bursting • Low power (<1W) • Data rate: 170Kbps

  9. Iridium Modem • Availability of service • Data rates too low for continuous data • Caveat • Link dropouts • Modem hangs • Intermediate power (4W) • Data rate: 2.4Kbps

  10. Ethernet • Requires infrastructure • Low power • Caveat • Network security issues • Data rate: 1Mbps (Q330 throttle)

  11. 900 MHz Ethernet Radio • Line of site only (100 km) • Point to point • More tolerant to humidity/rain • Caveat • Can be affected by weather • Low power (1.4W) • Data rate: 115Kbps

  12. 2.4 GHz Ethernet Bridge Radio • Line of site only (60 km) • Point to multi-point • Caveat • Can be affected by weather • Other radio interference • Intermediate power (4W) • Data rate: 10Mbps

  13. USArray TA Standard Site

  14. Realtime Date Rates

  15. Data Volumes

  16. Offload Time for 6 Months of 40 sps Data (~3GB)

  17. Typical Portable DeploymentAnd ~ 1W Power Consumption (not including sensors)

  18. Data Port 1: Net Center 1 Data Port 2: Net Center 2 Data Port 3: status Data Port 4: Burst or Continuous TX to status to Net Center 1 Hardwire to Net Center 2 Wireless Serial port TE Q330 QNET Serial Console FRAD, DSL, ISDN, Radio, VSAT, Dial Application: Serial Telemetry

  19. Q330 QNET Serial Console Application: Ethernet Telemetry Data Port 1: Net Center 1 Data Port 2: Net Center 2 Data Port 3: status Data Port 4: Burst or Continuous TX to status to Net Center 1 intranet to Net Center 2 Ethernet TE FRAD, DSL, ISDN, Radio, VSAT, Dial

  20. PB14 QNET Serial Q330 QNET Serial Console Serial Telemetry with Local Recording Data Port 1: Net Center 1 Data Port 4: Baler Storage Data Port 2: Net Center 2 Burst or Continuous TX Data Port 3: status Burst or Continuous TX to status to Net Center 1 Serial port TE to Net Center 2 FRAD, DSL, ISDN, Radio, VSAT, Dial

  21. PB14 QNET Serial Q330 QNET Serial Console LAN-based Telemetry with Local Recording Data Port 1: Net Center 1 Data Port 2: Net Center 2 Data Port 3: status Data Port 4: Baler Storage to status Burst or Continuous TX to Net Center 1 to Net Center 2 Ethernet TE FRAD, DSL, ISDN, Radio, VSAT, Dial

  22. PB14 QNET Serial Q330 QNET Serial Console Remote Digitization with Telemetry to Recording and WAN Access Site Data Port 1: Net Center 1 Data Port 2: Net Center 2 Data Port 3: status Net Center 1 Net Center 2 Burst or Continuous TX Internet Status Application Data Port 1: Net Center 1 Data Port 2: Net Center 2 Data Port 3: status Data Port 4: Baler Storage Burst or Continuous TX

  23. USArray Communications

  24. GSN II Proposed Configuration

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