Minicom Advanced Systems CMG-DCM manual Dss

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CMG-DCM

key-bucket : the key-bucket code, which tells the DCM which key to use for that particular stream.

The cryptographic hardware required to produce authenticated CD1.1 streams is installed only in Authentication Modules (AMs). To transmit unauthenticated CD1.1 data, you should use a key-bucket code of -1.

prefix : A prefix used to determine where to place generated CD1.1 subframes. For example, a prefix of /data/HPA1. will produce files in the /data/ directory beginning with HPA1. and followed by a unique timestamp. Several streams may produce files using the same prefix; indeed, this is recommended.

Blank lines, and any lines beginning with #, are ignored.

When you have finished editing the file, clicking Save changes will write the changes to disk. The changes will not take effect, however, until the CD1.1 service is restarted. You can restart all running CD1.1 services by clicking Restart CD1.1.

DSS

DSS (Data Subscription Service) is a packet format which enables data and statistics to be requested from a seismic installation. A DSS server is designed to handle many concurrent requests from clients with varying levels of privilege, and may prioritize requests according to their origin and urgency.

Gü ralp Systems' data modules include a package, libdss, which is designed to communicate with installations using DSS as either a server or a client. A daemon utility, dssserver, is also available which receives requests on a network port and replies to them. This server can be loaded onto Gü ralp DCM and AM data modules as required.

The dssserver program

dssserver initially listens on a network port for DSS_REG registration packets from clients. Any incoming connnections other than DSS_REG are refused with a DSS_REF packet. Receiving a valid DSS_REG packet, dssserver sends a DSS_ACK packet and adds the client to an internal client list, identified by its source IP address and port number.

Once a client is registered, dssserver will accept other DSS command packets from it.

dssserver fulfils requests by following this procedure:

•Receiving a valid DSS_REQ packet, dssserver will send a DSS_ACK packet immediately and add the request to an internal

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Contents CMG-DCM Table of Contents December Inside the DCM Introduction CMG-DCM Inside the DCM Serial port services Network servicesSee .4, Connecting to a local network for full details Installing the CMG-DCM Power supplyOverview Connecting to a single computer Connecting over a serial linkConnecting over Ethernet 192.168.0.xUsing an internal modem Connecting over USBConnecting to a local network Gcfgdbset option-namenew-value Wi-Fi Connecting to the InternetConnecting digitizers and external hardware Setting up the CMG-DCMWeb setup Setting up digitizers Using Scream Usage General notesDCM as a data store Gnblocks port-number Page CMG-DCM DCM as a GCF data source Accessing the DCM command line through gcfout Sensor arrays DCM as a network data hub Communicating with digitizers Configuring digitizers Data storage and retrieval Using miniSEED format Real-time data transmission CD1.0 and CD1.1 Troubleshooting DCM installations Cannot see the DCMs Web site over Http or Https Cannot connect to the DCMs Scream! serverCannot Gcfping the DCMs Scream! server Can Gcfping the DCMs Scream! server, but no data appears DCM is not receiving any data streamsUse the Serial port configuration → port name Web page, or DCM is receiving streams, but they do not contain any data143032 up 34 min, load average 1.24, 1.32 Configuration options GeneralDisk CMG-DCM Serial port configuration CMG-DCM Page Network configuration Ethernet portStatic routes DNS setup Incoming mail setup Outgoing mail setup Remote access Administrators PPP Mgetty Data transfer ScreamScream! Client AutoDRMHttp server Http clientCD1.0 CD1.1 CD1.1 subframe configuration DSS Server configuration Seed Page CMG-DCM Actions Data ViewerIcon bar Stream listDigitizer Setup General digitizer settings Digitizer output control CMG-DCM Trigger criteria CMG-DCM Tap # Rate Bandwidth Samples/s Auxiliary Mux channels Sensor mass control Disk tools Partition, and format diskCheck disk filesystem Flush flashDisk files CameraRecent Log Entries Network configuration SummaryDNS configuration Data Out Port, Serial Port A, Serial Port BFlash Status Tamper linesDisk Status Software Versions Inside the DCM File systems CMG-DCM Command line tools Configuration Digitizer console access Monitoring Data flowDigitizer status Tamper lines Updating the DCM Over the InternetFrom the hard disk Removing support packagesFirmware Libgconfigdb Appendix a Connector pinouts Appendix A.1 Modular DCM unitsPort a and B Data OUT portUSB connector Network connectorAppendix A.2 Integrated DCM units DM/AM module outputAppendix B Sensor and digitizer types Appendix B.1 Sensor response codesAppendix B.2 Digitizer type codes Digitizer