🚀 go-pugleaf

Peter Flass <peter...@yahoo.com> writes:
> Everyone was trying to get into everyone else's business, AT&T and Xerox
> into computers, IBM into copiers and communications (SBS and Rolm), Xerox
> into communications (Western Union), Kodak into copiers, etc.

IBM formed satellite business systems with comsat and aetna. There was
folklore that SBS constantly lost money ... in part because what
IBM charged SBS for the gold plated equipment ... that what it made
off selling equipment more than offset its 1/3rd of SBS losses ...
then when SBS was dissolved, IBM reimbursed comsat and aetna
for their losses.

Supposedly SBS was going to make money off computer communications
... but IBM's SNA was totally not suited for communications over
satellites .... SNA windowing/pacing didn't even handle T1/1.5mbits/sec
terrestrial latency ... so satelite latency really blew it out of the
water. SBS eventually fell back to trying to sell comsumer telephone
service over satellite ... round-trip latency over satellite was as bad
for voice as it was for SNA.

I started with HSDT project in the early 80s ... and some of the SBS
people set things up to run HSDT over high-speed satellite links.  HSDT
did rate-based pacing ... rather than window-base pacing ...  so it not
only straight-forward handled single-hop round trip between US coasts
... but also handled double-hop round trip between west coast and
europe.

past HSDT posts
http://www.garlic.com/~lynn/subnetwork.html#hsdt
some old HSDT related email
http://www.garlic.com/~lynn/lhwemail.html#hsdt

was also on the XTP technical advisory board
http://www.garlic.com/~lynn/subnetwork.html#xtphsp
and wrote up rate-based pacing for XTP specification
http://www.garlic.com/~lynn/xtprate.html