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When wslope6 was setup, ChrisG reported that the LEDs on the router and modem indicated that it was having problem establishing a connection. I believe the LEDs looked similar to what he saw with the spare isfs8 system when powering it up in the base trailer. Putting an antenna in the window solved that the problem at the trailer.
From http://www.eol.ucar.edu/deployment/field-deployments/field-projects/pcaps/ISFS/FieldNetwork
the LED on the USB760 modem (a little round LED which is about impossible to see in the sunlight) indicates the following:
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