[From nobody Thu Jul 24 13:54:56 2014
From: "Guillermo Delgado" <gdelgado@eso.org>
To: "Brian Glendenning" <bglenden@zia.aoc.NRAO.EDU>
Subject: Re: data link
Date: Tue, 21 Sep 1999 06:42:16 -0600
Message-ID: <000d01bf042e$bd779240$bb60ab86@alma.sc.eso.org>
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Hi Brian,

Thanks for your quick answer and excuse me for being so lazy in answering at
due time.

I am interested in the link to the outside world from ALMA. We all know that
there will be an Operation Support Facility (OSF) at San Pedro or somewhere
along the road between San Pedro and Chajnantor and there is a planned fiber
optic link between these two places. This link is our responsibility and
might carry a large amount of data (depending on the computing power at
Chajnantor and the amount of pre-processing done to the data before being
sent down to the OSF, etc.).

A different questions comes from the link between ALMA and the rest  of the
world. I say ALMA because it does not matter where we put the outside link
(OSF or Chajnantor) since we have the two sites linked internally.

Regarding the outside link, we are exploring the technical and economical
feasibility of linking ALMA with one of the fiber optics backbones along
theh country (presently 2.5 Gb and expandable). This backbone belongs to
"Telefonica" the biggest telecommunication company in Chile,
http://www.ctcmundo.cl/  (the main shareholder is "Telefonica" from Spain,
one of the biggest in the field). Presently they are serving a group of
mines in the Salar de Atacama at about 50 km straight line from Chajnantor
and Calama at about 60 km from San Pedro. The technical workgroup includes a
joint research group of University of Chile and NEC (Japan) working in th
field of broadband data link services, http://www.accessnova.cl/

The geographical constraints might favour a mixed link with microwave and
fiber optics or pure fiber optics... we do not know yet, this is what we
will start working now.

I need to know now the required bandwidth for the outside world data link (a
gross estimate will be just fine). From what I have being reading, a figure
of 10 Mb/s is expected at some point, but this only includes image
transfers. Then we have possible control, video conferences, telephone, etc.
etc.

If you can give me a hand with these figures I will apretiate it very much.

Cheers,

Guillermo


----------------------------------------------------------------------------
------
Dr. Guillermo Delgado
European Southern Observatory
Atacama Large Millimetre Array (ALMA)

E-mail: gdelgado@eso.org
URL: http://puppis.ls.eso.org/staff/guillermo/guillermo.html
Phone: +56 (2) 228 5006
Fax: +56 (2) 228 5132
---------------- Life is too short to be taken
seriously --------------------


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