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In article <1jvcesINNki1@jhunix.hcf.jhu.edu>, ko_mike@jhunix.hcf.jhu.edu 
(Michael Y Ko) writes:

 > I know there are three main sites that receive and control information from 
 > the Hubble Space Telescope. I think they're JPL, Goddard, and Space
 > Telescope Institute in Baltimore.
 > 
 > Can anyone tell me what the function is of the Space Telescope Institute?

HST telemetry usually goes to a TDRS in geosynchronous orbit, then down to
White Sands, then via some commercial satellite to Goddard.  People at Goddard
watch the engineering telemetry, especially for health and safety concerns,
and also do most of the real-time commanding that is necessary.  Goddard
also receives the science data but has few facilities to look at it or analyze 
it.

Goddard ships both the science and engineering telemetry to STScI in Baltimore.
We also look at the engineering telemetry, but more specifically at the actual
science observations in progress to verify that the science instruments did 
they were supposed to do.  We get all the science data, take a quick look at 
most of it to verify its integrity, package it up for the Investigators, and
archive it.  Our real-time commanding is presently limited to making small
pointing corrections and occasinally setting an event flag.  We will have more
real-time responsibilities for aligning the COSTAR mirrors. 

I do not know of any real-time link to JPL.  Perhaps you are thinking of 
Marshall Flight Center, which had some responsibilites in the early stages
following launch.

Ben