22 Jan
2014
22 Jan
'14
9:29 p.m.
On 01/22/2014 07:58 PM, Eric Smith wrote:
The described problem occurs when using async mode,
not sync, but when
using a modem that does synchronous modulation, which is all modems that
use modulations fancier than FSK, i.e. voice-band POTS modems at 2400 bps
and up, and full-duplex 1200 bps, and when NOT using MNP or V.42 error
control implemented in the modem. This means that it was a common
occurrence when using the uPD7201/8274 with early 212, V.22, and V.22bis
modems. It mostly was not seen with V.32 and later modems because those
almost always use V.22 error control.
Interesting. When I used the 8274, anything faster than 2400 would have
been a leased line or hardwired. A bit before before the Trailblazer.
Is there an app note or errata sheet from Intel on 8274 regarding this?
--Chuck