more on the HFC saga
Bruce Lilly
bruce at balilly
Sat May 25 09:50:05 AEST 1991
In article <1991May24.054753.28804 at colnet.uucp> res at colnet.uucp (Rob Stampfli) writes:
>
> "However, in the full-duplex variations, RTS/CTS is used as a kind of
> throttle. The signals have the opposite meanings than they do for
> half-duplex communications.
>
> "When a DTE device is able to accept data, it asserts pin 4, Request to
> Send. If the DCE is ready to accept data, it asserts pin 5, Clear to
> Send. If the voltage on RTS or CTS drops at any time, this tells the
> sending system that the receiver is not ready for more data...
>
>This seems to agree with what the poster says above. Could it be that
>AT&T implemented the half-duplex standard, which deals only with DTE to DCE
>flow control? I have always assumed HFC worked like what was described as
>the full-duplex variation, but maybe this is not the case. It would be
>interesting to hear from someone more well versed in the implementation
>of the standards.
HFC in the 3b1 (at least with 3.51m) works as described above
(full-duplex). There is, however a TCSRTS ioctl which only works in
half-duplex.
--
Bruce Lilly blilly!balilly!bruce at sonyd1.Broadcast.Sony.COM
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