Article View: alt.folklore.computers
Article #620180Re: Important US technology companies sold to foreigners
From: Andrew Swallow
Date: Tue, 06 Feb 2018 03:40
Date: Tue, 06 Feb 2018 03:40
31 lines
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3910 bytes
On 05/02/2018 22:01, 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 suspect the main problem was shortage of ram (especially when using
magnetic core). The system probably had a two packets in transmission. A
satellite needs buffering for 30-40 packets. With multi-hop delays can
easily exceed one second.
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