III-5. WIRELESS REMOTE IMAGING SYSTEM
83
Figure III-5-6. Base station antennas.
tional two-port serial interface into an Intel-
abled the RIS 36 days of the 97 days, while
based computer. The computer runs the Red
the fourth affected the reliability of one of the
Hat Linux operating system.
remote sites. Modem failures, an incorrect
Script files developed at CRREL run by the
baud rate setting (human error), and a solar
Linux operating system's cron daemon are re-
panel misalignment at Pond 183 affected sys-
sponsible for all aspects of connecting to the
tem performance. The modem that failed was
remote camera, transferring the images to
the US Robotics modem at the base station
CRREL, and posting them to the ERF Web site.
located on Bravo Bridge. The modem failed
twice at this location. It was decided after the
second modem replacement that more pro-
tection against transient voltage spikes on the
SYSTEM PERFORMANCE
telephone line was required. A Dead Bolt
The RIS performed moderately well dur-
surge protection device was installed between
ing the 2000 field season. The RIS was in-
the modem and the phone line. At that time
stalled on 15 May 2000 and removed at the
the RIS should have been up and running
end of the field season on 15 August 2000, for
if it weren't for an incorrect baud rate
a total of 97 days. During that time the RIS
setting.
experienced four issues that affected its abil-
The baud rate of the serial interface of the
ity to retrieve images. Three of the issues dis-
telephone modem that communicates with
Linux
From Anchorage
US Roboti cs
Military
Computer
Alaska
DSN Line
Modem
Figure III-5-7. CRREL site.
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