Sunday, July 31, 2005

The big loop

It's rare, but it's happened again... I heard a new term and searched for it in Google and found *nothing* related to it's true meaning.  The term was "", which is what NASA calls the open communication channel which is used for communications with the () and the space shuttle.  If you listen to NASA TV you hear occasional references to the big loop.  NASA has other preferred communication channels with higher bandwidth and privacy, but they have incomplete coverage.  The  operates 24/7 everywhere all of the time.  I was hoping to use Google to find out how we can listen to it, but no luck, so far.

-- Jack Krupansky


At 5:28 AM EDT , Blogger From The Basement Of The Science Building said...

google search: "the big loop" nasa

At 5:36 AM EDT , Blogger From The Basement Of The Science Building said...

from nasa:

From: Andy Smith, of Gloucester, U.K.
To: Derek Hassman, flight director

Question: When MCC or the crew talks to each other, one of them always say "Air to ground 1 or 2." Does it matter which one is used? Why do they tell each other which one they are using?

Answer: Excellent question, Andy. Both the orbiter and ISS have two channels that can be used to communicate between the vehicle and the ground. For the orbiter, these are called Air-To-Ground 1 and Air-To-Ground 2. For ISS, these are called Space-To-Ground 1 and Space-To-Ground 2. During docked missions, we configure these channels so that Air-To-Ground 1 and Space-To-Ground 1 are connected. This means that when people talk to either vehicle on this "Big Loop," both vehicles hear the calls. The Air or Space-To-Ground 2 loops are used for the ISS team to talk just to the ISS or for the shuttle team to talk just to the shuttle.

The crew and ground usually call out which loop they are calling on so that the other side knows which channel to reply on.

- Ed Van Cise
11A Orbit 3 Operations Support Officer (OSO)


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