[casper] fiber capacity

[Tom Kuiper]

During the upcoming Goldstone 70-m down-time, we have an opportunity to 
put fibers dedicated to radio astronomy in the antenna.  The receiver we 
envision would, when fully built up, have 40 2-GHz ADCs.  To be able to 
use our signal processing equipment with other antennas as well, we 
would want to put it in the Signal Processing Center, which is about 0.5 
km away from the receiver.  I assume that we would have a 10 GBe switch 
in the antenna.  Could someone give me an estimate of how many fibers of 
what kind would best serve our needs?

An alternative scheme would be what GAVRT DSS-28 does, which would be to 
bring 40 IFs to the SPC and digitize there.  That way the ADCs could 
serve other antennas.  However, this appears to me to be more expensive 
and more problem prone, and ADCs are cheap.

Thanks and regards

Tom