Internet Connectivity Examples
RAL has provided a connection to an Internet
gateway via 10BASE-2 thin-wire cable. Microsoft local network
is available within the same network segment. An operator at
the Lab is able to access the Digisonde data directories via
the "network drive" mechanism. Thus, RAL office computers with
Windows 95/NT can be used as Remote Control Platforms running
Viewer application in monitoring/control mode.
The online sounding data are transferred
via FTP to the World Data Center C1 UNIX computer for archiving.
2. RAL / Lerwick, Shetland Is., UK
No Internet connection is available at
Lerwick site as of October 1997. A modem is used to provide
a (limited) remote access to the Digisonde. WDC-C1 client makes
regular automated connections to the DPS to download recent
sounding data. Download schedule assumes a few hours delay before
the data can be published on the Web by WDC-C1. Remote control
of Digisonde and software upgrades are possible via modem connection.
A fiberoptic cable is provided to the Digisonde
256 hut to connect to BAO/Haystack network. The original configuration
assumed Digisonde 256 transferring real-time data to an ARTIST-3
computer which further delegates the data to ARTIST-4 computer
for processing, archiving, WWW publishing and disseminating
over FTP. However, for the last two years UMLCAR always has
a newly assembled VIS (JORN DPS-1) station under test at Millstone
Hill. An arrangement is made for VIS to report ionograms over
FTP to the ARTIST-4 computer of Digisonde 256 (the VIS itself
does not provide WWW service).
|When the full-featured connection
of Digisonde to Internet is impossible or data rates are
too low for a satisfactory WWW operation, the scenario
of reporting online data to a remote ARTIST-4 computer
for processing and Web publishing should be considered.
To provide Digisonde remote control capabilities and software
upgrades, the minimum requirement is a modem connection
to the original Digisonde site.
The Digisonde is located within the Institute
building and simply included into the ING network. The configuration
is very similar to RAL Chilton setup but no data is reported
to a WDC as of October 1997. The ADEP post-processing is located
with the Digisonde in the same office to produce CD-ROMs with
the sounding data.