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[ih] Statistical multiplexing
- Subject: [ih] Statistical multiplexing
- From: gnu at toad.com (John Gilmore)
- Date: Sun, 15 Mar 2020 23:54:58 -0700
- In-reply-to: <[email protected]>
- References: <[email protected]>
> When was statistical multiplexing invented?
The first product I know of that included it was called a Smart/Mux.
One of my early employers, Scientific Time Sharing Corp. in Bethesda,
which ran an IBM mainframe running APL. They used pairs of these to
compress the traffic of modem banks in remote cities (typically 300 baud
modems carrying 134.5bps printing Selectric terminal traffic, often
dialed in to with with acoustic couplers). This was in about 1973.
I'd look for ads in old magazines like Datamation or Computerworld.
Here's an article in Computerworld of August 28, 1974, page 19, complete
"DCA's Smart/Mux Has Bit/Sec Detection
Atlanta - Digital Communications Associates, Inc. has added an
intelligent remote multiplexer to its line of programmable front ends
Thy Smart/Mux offers automatic bit/sec rate detection for 10-, 15- and
30 char./sec terminals; complete character transparency; and error
detection/retransmission, according to the firm.
The multiplexer can transmit data from up to 32 interactive mixed-
speed terminals over a 2,400 bit/sec synchronous link to the head-end
multiplexer, and dial backup capability is provided, a spokesman
Smart/mux options include a remote line printer, card readers, full-
and half-duplex 1,200 bit/sec terminal support, and support for IBM
2780 remote job entry terminals.
A host-end Smart/Mux can handle up to six remote-and multiplexers,
the firm stated. A typical system with 24 ports costs $18,400.
Delivery is 60 days from the firm at 2801 Clearview Place, Suite 400,
Hmm, it looks like IDG donated a complete set of Computerworld's and
funded their scanning by the Internet Archive! Now there's some history...
Here's some brief info about the company:
That page led me to this very interesting history of computer
communications by Jim Pelkey, from 85 interviews he also made available,