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Portable Broadband Seismology

Learn about various communication options for portable broadband seismology, including VSAT, cellular modems, Ethernet radios, and more. Discover their pros and cons, data rates, power consumption, and application suitability.

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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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