Transcript Portable Broadband Seismology Part 5: Communication Options Jakarta, Indonesia

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)
• Data rates: 256Kbps
VSAT Telemetry Deployment
G P S A ntenna
Baler
E X P A N S IO N
S E R IA L
QNET
P OW E R
PB14
Q330
3-Channel
VSAT
Terminal
GPS
SENSOR A
SENSOR B
S E R IA L
QNET
P OW E R
E X P A N S IO N
CONS OLE
Q 330
Battery Box
STS-2
Seismometer
DC Powered VSAT Site
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
• 25 Watts DC power
•75 W solar array
• AC preferred or
500 W solar array
•~2 m vault depth
•Up to 50 km radio
range
VSAT Regional Site
VSAT install near barn with AC
power
Remote site uses RF radio
to telemeter date to VSAT
Cell Modem
• Availability of service
• Service providers prefer
bursting
• Low power (<1W)
• Data rate: 170Kbps
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
• Requires infrastructure
• Low power
• Caveat
– Network security issues
• Data rate: 1Mbps (Q330
throttle)
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
• 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
USArray TA Standard Site
Realtime Date Rates
Rate
40 sps
180 byte/s
40 sps w/OH
~360 byte/s
100 sps
450 byte/s
Iridium
300 byte/s
Freewave
15 KB/s
Cell Modem
21 KB/s
VSAT
32KB/s
Wilan
1 MB/s
Data Volumes
3 channels @ 1 sps 11 MB/month
3 channels @ 40
475 MB/month
sps
3 channels @ 100
1.2 GB/month
sps
Offload Time for 6 Months of 40
sps Data (~3GB)
DAS
Wilan
Baler
Cell
Iridium
Rate
Time
10 Mbps
11 Mbps
0.4 MBps
21 KBps
300 Bps
40 mins
37 mins
125 mins
44 hrs
2777 hrs
Typical Portable Deployment
And ~ 1W Power Consumption (not including sensors)
G P S A ntenna
Baler
E X P A N S IO N
S E R IA L
QNET
P OW E R
PB14
Q330
3-Channel
GPS
SENSOR A
SENSOR B
S E R IA L
QNET
P OW E R
E X P A N S IO N
CONS OLE
Q 330
Battery Box
STS-2
Seismometer
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
to Net Center 2
Hardwire
Wireless
Q330
QNET
Serial Console
Serial portTE
FRAD, DSL,
ISDN, Radio,
VSAT, Dial
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
to Net Center 2
intranet
Ethernet TE
Q330
QNET
Serial Console
FRAD, DSL,
ISDN, Radio,
VSAT, Dial
Serial Telemetry with
Local Recording
PB14
QNET
Serial
Data Port 4: Baler Storage
Burst or Continuous TX
Serial port TE
Q330
QNET
Serial Console
FRAD, DSL,
ISDN, Radio,
VSAT, Dial
Data Port 1: Net Center 1
Data Port 2: Net Center 2
Data Port 3: status
Burst or Continuous TX
to status
to Net Center 1
to Net Center 2
LAN-based Telemetry with
Local Recording
PB14
Q330
QNET Serial
QNET Serial Console
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
FRAD, DSL,
ISDN, Radio,
VSAT, Dial
Ethernet TE
to status
to Net Center 1
to Net Center 2
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
Burst or Continuous TX
Net Center 1
Internet
Status Application
PB14
QNET Serial
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
Q330
QNET Serial Console
Net Center 2
USArray Communications
GSN II Proposed
Configuration