Article View: alt.folklore.computers
Article #620172Re: Important US technology companies sold to foreigners
From: Dan Espen
Date: Tue, 06 Feb 2018 02:44
Date: Tue, 06 Feb 2018 02:44
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4013 bytes
Peter Flass <peter...@yahoo.com> writes:
> <hanc...@bbs.cpcn.com> wrote:
>> On Saturday, February 3, 2018 at 9:42:21 PM UTC-5, Lynn Wheeler wrote:
>>>
>>> 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.
>>
>> That is surprising, since early on in satellite communications
>> they discovered the problem with latency in both voice and data
>> transmission. Indeed, by 1960, they knew the characteristics of
>> voice and data were different enough to require different line
>> treatments ("conditioning") to accommodate higher data speeds
>> on landlines.
>>
>> I'm not sure when SNA was developed, but I would guess by that
>> point overseas computer data transmission was already in place
>> via cable, as well as transcontinental data transmission via
>> microwave, which has latency, too.
>>
>> Some of that is touched on in the following:
>> http://massis.lcs.mit.edu/telecom-archives/archives/technical/western-union-tech-review/21-4/p174.htm
>
> I expect that IBM was looking at bulk data transfer, where latency would
> not be a significant problem. It would not have been good for interactive
> use. Also, perhaps they expected Raleigh to fix the pacing problems, and
> from what Lynn has said about them, I expect they wouldn't.
I think one of the steps IBM always goes through is when they
ask themselves, "Is this process to simple? Can our competitors
duplicate it?".
Hence things like CKD disk, APPC, 3270, VSAM.
--
Dan Espen
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