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From: roy@phri.UUCP
Newsgroups: comp.dcom.modems
Subject: How to pick a medium speed WAN connection?
Message-ID: <2619@phri.UUCP>
Date: Thu, 26-Mar-87 15:17:17 EST
Article-I.D.: phri.2619
Posted: Thu Mar 26 15:17:17 1987
Date-Received: Sat, 28-Mar-87 08:30:02 EST
Reply-To: roy@phri.UUCP (Roy Smith)
Organization: Public Health Research Inst. (NY, NY)
Lines: 34


	As a relative neophyte a datacomm, I recently had tossed in my lap
the assignment of "getting our computers talking with their computers".  I
think we've figured out that running IP over a point-to-point link is what
we have to do.  What I don't know anything about is how to set up the
physical link.  My "normal" alternatives so far seem to be:

	1) Leasing a D1 conditioned analog line from the phone company,
over which we can supposedly run 9.6kbps.  This will cost about $1000 to
install and about $140/month.

	2) Leasing a 9.6 kbps DDS line for $600 up front and $360/month.

	3) Leasing a 56 kbps DDS line for $600 up front and $700/month.

	4) Leasing a T1 "superpath" line.  This costs about $2500 to
install and $700-1500 per month, depending on details of distance which
aren't known yet.

	In each case, we need to purchase random boxes to go at each end
(DSU/CSU, MUX, modems, etc).  Assuming we can get by with 9.6 kbps, what is
there to choose between the first two alternatives?  Are we going to see
any better performance with a DDS line instead of the D1 analog line.  Just
what is D1 conditioning anyway?  What if we wanted to really cheap out and
get a POTS line and something like a Microcom AX/9624c which claims to be
able to do 19.2 kbps over an unconditioned dial-up line?  Is this a viable
alternative?  Considering how much cheaper it is, there must be *some*
reason why it won't work, but I don't see it.
-- 
Roy Smith, {allegra,cmcl2,philabs}!phri!roy
System Administrator, Public Health Research Institute
455 First Avenue, New York, NY 10016

"you can't spell deoxyribonucleic without unix!"