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Published byMonica Fox Modified over 7 years ago
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IRIS Active Source Workshop Jan 29, 2014 Tucson AZ 125 Texan Recorder Data Storage
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125 Texan circa 1997 Size of beer can - external geophone D-Cell alkaline batteries NAND Memory on PCB assembly –Initially 32 MByte –Eventually 256 MByte Offload using special 1 Mbps serial –Effective rate of 100 KBps –45 minutes for 256 Mbyte No Operating System –Interrupt driven task
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125A Texan II circa 2005 Size of beer can - external geophone D-Cell alkaline batteries Embeded Linux OS Embedded USB flash drive –256 MByte initial capacity –Eventually 1 GByte capacity Hi Speed USB data transfer –480 Mbps –Effective rate depends on the USB drive Current device ~40 MBps Less than 1 minute for 1 Gbyte (~30 seconds) –.
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Key limitations in 2005 Putting a MPU between the data storage device and the PC slowed the transfer –No Embedded MPU offered Hi Speed USB Thru-put is limited by the USB, even though multiple devices can be copied simultaneously, effectively only one device is copied at a time Implementation was to multiplex the USB drive between the slower embedded MPU and the PC.
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S tate of the Art Data Storage Today USB-3 5 Gbps – point to point and transfer speed is limited by the device 80 MBps consumer grade USB-2 Industrial grade 40 MBps Firewire 1-2 Gbps – p2p SATA – 6 Gbps – p2p SD Card – 90 MBps (Sandisk Extreme) 25 MBps Industrial grade (~3 min for 4 Gbyte – p2p
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Possible data configuration 10 Gbps Ethernet Hubs –1 Gbps effective rate per connection 10 Gbps Network Access Storage Dual CPU in recorder –Low Power CPU for data acquisition –Hi performance embedded Linux CPU that supports Gbps Ethernet and SD Flash storage Or dual speed CPU –unlikely to find low enough power coupled with Gbps Ethernet.
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Paul’s list from today for a new instrument > data storage – 32 GB is available 1 vs 3 channels – increase in power Reliability – keep it simple Ease of deployment –Size –Weight –Limited configuration/field user interaction Longer operating time – lower power Time-keeping for longer duration Raw data format
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New Product for REF TEK Was not designed for Active Source – but has a lot of the features Self contained – no cables - preconfigured 3-channel – internal 2-Hz geophone Batteries for 7 days continuous recording and autonomous operation GPS timing M-SEED recording
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