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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

Portable Broadband Seismology

Part 5: Communication Options

Jakarta, Indonesia

May 11-13, 2006

Bruce Beaudoin

Marcos Alvarez



VSAT

  • Private vs Internet Accessibility

  • Link Tuning

  • Caveat

    • Packet “eating”

    • UDP checksum

    • rain fade

    • Modem hangs

  • High power (>20W)

  • Data rates: 256Kbps




Station communications layout
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


Vsat regional site
VSAT Regional Site

VSAT install near barn with AC power

Remote site uses RF radio to telemeter date to VSAT


Cell modem
Cell Modem

  • Availability of service

  • Service providers prefer bursting

  • Low power (<1W)

  • Data rate: 170Kbps


Iridium modem
Iridium Modem

  • Availability of service

  • Data rates too low for continuous data

  • Caveat

    • Link dropouts

    • Modem hangs

  • Intermediate power (4W)

  • Data rate: 2.4Kbps


Ethernet
Ethernet

  • Requires infrastructure

  • Low power

  • Caveat

    • Network security issues

  • Data rate: 1Mbps (Q330 throttle)


900 mhz ethernet radio
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


2 4 ghz ethernet bridge radio
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






Typical portable deployment and 1w power consumption not including sensors
Typical Portable DeploymentAnd ~ 1W Power Consumption (not including sensors)


Application serial 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

Hardwire

to Net Center 2

Wireless

Serial port

TE

Q330

QNET Serial Console

FRAD, DSL,

ISDN, Radio,

VSAT, Dial

Application: Serial Telemetry


Application ethernet telemetry

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


Serial telemetry with local recording

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


Lan based telemetry with local recording

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


Remote digitization with telemetry to recording and wan access site

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




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