[ih] Nit-picking an origin story (touch at strayalpha.com)

[David Arnold]

> AT&T describes the use of the 303 wide-band data station/modem (sort of the
> size of a 2-drawer file cabinet):  "The next lower convenient breakdown is
> the "group" channel which uses the bandwidth of 12 voice circuits. The
> 303-type equipment can transmit at a synchronous speed of 50 kilobits per
> second over group facilities."

So, if 12 analog circuits gives 50kbps after some overhead, does that imply 4800bps per analog channel?

If analog 9600bps was available, that would seem like an easy upgrade to 100kbps (115.2 raw)?  As I recall (but in Australia, so maybe different) analog 9600 was available well before ISDN and its 56/64kbps BRIs?

Or perhaps the 50kbps was a limitation of the mux/demux rather than the analog circuits?




d