CMG-DCM

Data Communications Module

A stand-alone DCM

The CMG-DCM is a versatile and powerful module designed for storing and transmitting data captured using Güralp Systems Limited's range of seismic measuring equipment.

About the DCM

Backed by the stability of the Linux operating system, but still consuming less than 1 W of power, the CMG-DCM is an ideal choice for seismic installations ranging from single-instrument boxes to the largest arrays.

The CMG-DCM is designed to integrate seamlessly with computer networks and the Internet. An on-board Web server allows you to log in to the DCM by secure HTTPS and alter its configuration. You can also use it to configure any attached Güralp digitizer units from anywhere on the Internet.

In addition, the CMG-DCM can work with many popular data formats and protocols including CD1.0/1.1, full SEED, SeedLink and of course Güralp's own Scream! software.

The DCM supports a wide range of data transfer methods.

CMG-DCM units can be integrated with any new CMG-DM24 digitizer, and can also be retrofitted onto existing units to enhance their communication abilities. Comprehensive configuration options allow the unit to be installed with ease into a pre-existing array. Multiple CMG-DCM units can communicate with each other, allowing you to construct robust arrays with redundant links.

Features

Remote configuration and monitoring over the Web (secure https protocol)
User-level access and security
Configure and control attached digitisers over the network
Local configuration over USB, or support for USB peripherals
Support for PPP and SLIP over RS232
Low power consumption (<1 W)
Full TCP/IP support
Linux OS
Flash memory storage
Easy-access onboard hard disk (surface units)
Optional built-in UPS

Web page interface

Direct configuration and data monitoring.

Stored data can be downloaded direct from the Web server.

Comprehensive networking options.

A flexible and innovative feature of the CMG-DCM is its on-board Web server, which can be configured and accessed securely from your network or from anywhere on the Internet.

Using the Web server, users can administer the entire seismic system, including monitoring data, checking tamper lines and reconfiguring DCM services.

The Web page also provides full access to the configuration settings of the Güralp digitizers and digital instruments attached to it. Using this facility, a logged-in user can alter the settings of a remote installation from anywhere on the network.

Form factors

Depending on your site requirements, the DCM may be supplied in several formats. Although these look different, they all share the same internal features.

Stand-alone

The standard DCM module is housed in a high-impact copolymer polypropylene case with mil-spec connectors. It may be and installed in a ground station or other location remote from the digitiser and seismometer.

It can accept data from up to three devices connected to it through RS232 ports.

A stand-alone DCM comes equipped with a rugged 40Gb USB/IEEE1394 ("FireWire") hard disk for on-site storage. The hard disk is hot-swappable and can be removed with gloves; its unique journalled file system is robust yet readable with standard PC, Linux and SunOS drivers (USB Mass Storage/FAT-32).

Rack-mounted

A rack-mounted DCM

The DCM can also be supplied in a form factor suitable for mounting in a standard 19” rack. Such a DCM will normally come equipped with eight additional serial ports.

Up to four modules may be mounted side-by-side in a 19” rack.

Integrated

An integrated borehole DCM

An integrated DCM may be combined with a digitiser and seismometer to produce a single borehole instrument capable of measuring seismic data, storing, and passing it on over a network.

These DCMs use a single 26-pin connector to communicate, rather than having separate ports.

Connectivity options

DCMs in any of these forms may be supplied in the configuration most suitable to your requirements, depending on how you wish it to be connected to your network, and how its USB interface is to be used. The two sets of options are independent.

Using the 10BaseT Ethernet network option, you can connect the DCM to any TCP/IP network, and communicate with it using a Web-based interface. You can also log in to the DCM's Linux operating system directly using SSH, or read data from any application that supports the GCF format (such as Scream!, Antelope, or Earthworm).
Alternatively, an internal or external modem may be supplied, through which you can use a dial-up or other communications link to connect to your home network.
As a third option, an 802.11b Wi-Fi module may be installed.

If the USB host option is installed, you can connect the USB port to an additional peripheral, such as a camera or external hard disk.
If the USB client option is installed, you can connect the DCM's USB port to a computer and communicate with it as if it were on a private network.

Whichever set of options you choose, you can also use any free RS232 port to connect the DCM to a single computer for local monitoring and configuration, or through it to a wider network using PPP/SLIP.

CMG-AM Authentication Module

The CMG-AM is based on the same low power technology as the CMG-DCM, but with additional strong cryptographic capabilities. Using an on-board crypto-token, the CMG-AM is capable of signing outgoing data at source.

The CMG-AM is particularly powerful in borehole installations, as it can be combined with the digitizer in a single downhole package. Data exiting the borehole is already cryptographically signed, making it practically impossible to interfere with the data between production and transmission.



Home Products CMG-3T CMG-3TD CMG-3ESP Compact CMG-3ESPD Compact CMG-5T CMG-5TD CMG-5T Compact CMG-40T CMG-6TD CMG-CD24 CMG-DM16 CMG-DM24 CMG-DCM CMG EDU All products Software New installations Customer support About us	CMG-DCM Data Communications Module A stand-alone DCM Datasheet Manual Manual (HTML, online) Quick start sheet The CMG-DCM is a versatile and powerful module designed for storing and transmitting data captured using Güralp Systems Limited's range of seismic measuring equipment. About the DCM Backed by the stability of the Linux operating system, but still consuming less than 1 W of power, the CMG-DCM is an ideal choice for seismic installations ranging from single-instrument boxes to the largest arrays. The CMG-DCM is designed to integrate seamlessly with computer networks and the Internet. An on-board Web server allows you to log in to the DCM by secure HTTPS and alter its configuration. You can also use it to configure any attached Güralp digitizer units from anywhere on the Internet. In addition, the CMG-DCM can work with many popular data formats and protocols including CD1.0/1.1, full SEED, SeedLink and of course Güralp's own Scream! software. The DCM supports a wide range of data transfer methods. CMG-DCM units can be integrated with any new CMG-DM24 digitizer, and can also be retrofitted onto existing units to enhance their communication abilities. Comprehensive configuration options allow the unit to be installed with ease into a pre-existing array. Multiple CMG-DCM units can communicate with each other, allowing you to construct robust arrays with redundant links. Features Remote configuration and monitoring over the Web (secure https protocol) User-level access and security Configure and control attached digitisers over the network Local configuration over USB, or support for USB peripherals Support for PPP and SLIP over RS232 Low power consumption (<1 W) Full TCP/IP support Linux OS Flash memory storage Easy-access onboard hard disk (surface units) Optional built-in UPS Web page interface Direct configuration and data monitoring. Stored data can be downloaded direct from the Web server. Comprehensive networking options. A flexible and innovative feature of the CMG-DCM is its on-board Web server, which can be configured and accessed securely from your network or from anywhere on the Internet. Using the Web server, users can administer the entire seismic system, including monitoring data, checking tamper lines and reconfiguring DCM services. The Web page also provides full access to the configuration settings of the Güralp digitizers and digital instruments attached to it. Using this facility, a logged-in user can alter the settings of a remote installation from anywhere on the network. Form factors Depending on your site requirements, the DCM may be supplied in several formats. Although these look different, they all share the same internal features. Stand-alone The standard DCM module is housed in a high-impact copolymer polypropylene case with mil-spec connectors. It may be and installed in a ground station or other location remote from the digitiser and seismometer. It can accept data from up to three devices connected to it through RS232 ports. A stand-alone DCM comes equipped with a rugged 40Gb USB/IEEE1394 ("FireWire") hard disk for on-site storage. The hard disk is hot-swappable and can be removed with gloves; its unique journalled file system is robust yet readable with standard PC, Linux and SunOS drivers (USB Mass Storage/FAT-32). Rack-mounted A rack-mounted DCM The DCM can also be supplied in a form factor suitable for mounting in a standard 19” rack. Such a DCM will normally come equipped with eight additional serial ports. Up to four modules may be mounted side-by-side in a 19” rack. Integrated An integrated borehole DCM An integrated DCM may be combined with a digitiser and seismometer to produce a single borehole instrument capable of measuring seismic data, storing, and passing it on over a network. These DCMs use a single 26-pin connector to communicate, rather than having separate ports. Connectivity options DCMs in any of these forms may be supplied in the configuration most suitable to your requirements, depending on how you wish it to be connected to your network, and how its USB interface is to be used. The two sets of options are independent. Using the 10BaseT Ethernet network option, you can connect the DCM to any TCP/IP network, and communicate with it using a Web-based interface. You can also log in to the DCM's Linux operating system directly using SSH, or read data from any application that supports the GCF format (such as Scream!, Antelope, or Earthworm). Alternatively, an internal or external modem may be supplied, through which you can use a dial-up or other communications link to connect to your home network. As a third option, an 802.11b Wi-Fi module may be installed. If the USB host option is installed, you can connect the USB port to an additional peripheral, such as a camera or external hard disk. If the USB client option is installed, you can connect the DCM's USB port to a computer and communicate with it as if it were on a private network. Whichever set of options you choose, you can also use any free RS232 port to connect the DCM to a single computer for local monitoring and configuration, or through it to a wider network using PPP/SLIP. CMG-AM Authentication Module The CMG-AM is based on the same low power technology as the CMG-DCM, but with additional strong cryptographic capabilities. Using an on-board crypto-token, the CMG-AM is capable of signing outgoing data at source. The CMG-AM is particularly powerful in borehole installations, as it can be combined with the digitizer in a single downhole package. Data exiting the borehole is already cryptographically signed, making it practically impossible to interfere with the data between production and transmission.